Bulgarian citizenship is not the next residence card and it does not arrive automatically after a set number of years. A successful application depends on the precise legal route, the status you have actually held, consistent civil records, Bulgarian-language evidence where required and a final Presidential decree. This guide shows British applicants where the routes differ, what the official process can prove and where a generic answer becomes unsafe. It also explains the dual-nationality decision that many summaries get dangerously wrong, without pretending that one checklist can decide every case.
Do not order police certificates, renounce British citizenship or pay an intermediary until you have matched your facts to a current article of the Bulgarian Citizenship Act and its current Ministry checklist. The Act cited here was consolidated through State Gazette issue 55 of 16 June 2026. This page explains the framework but cannot decide parentage, nationality release, criminal history or a disputed residence record.
Residence gives a foreign national permission to live in Bulgaria under immigration law. Citizenship makes the person a Bulgarian national. The two can connect, but one never quietly converts into the other.
A time-limited status based on a particular ground. It can support daily life and later immigration history, but it is not itself the qualifying five-year status named in Article 12.
Acquired under nationality law, including by origin or Presidential decree. It brings Bulgarian nationality and EU citizenship, but is not a tax ruling or a guarantee for relatives.
A long-term or permanent residence card can allow an indefinite or durable stay without making its holder Bulgarian. The holder remains a British national for nationality purposes, uses the appropriate foreigner identity document and has the rights attached to that residence status. Citizenship changes the relationship with the Bulgarian state. Bulgarian law generally treats a Bulgarian dual national as Bulgarian while its law applies.
The practical consequences can include a Bulgarian identity card and passport after the separate registration steps, EU free-movement rights, Bulgarian political rights and access to roles reserved by law. It also brings duties. None of this means a spouse, child or parent automatically acquires the same status, and it does not retrospectively repair an expired permit or an inaccurate civil record.
For the immigration route that comes before this question, use the residency guide. Withdrawal Agreement status, post-2020 British arrivals and Schengen visitor rules belong in the Brexit guide. This page begins when citizenship itself is the decision.
There is no universal citizenship checklist. Each route changes which conditions must be proved, which conditions are removed and which evidence matters. Use this table to find the question to investigate, not to self-approve a case.
| Route | Who it may fit | Central threshold | Common false assumption |
|---|---|---|---|
| Ordinary naturalisation, Article 12 | An adult without a more specific route | At least five years holding permanent or long-term residence, plus the other statutory conditions | Five years living anywhere in Bulgaria is enough |
| Spouse, born in Bulgaria or qualifying status before adulthood, Article 13 | One of the three statutory groups | At least three years holding permanent or long-term residence, plus the relevant additional fact and retained conditions | A wedding creates citizenship after three years |
| Bulgarian origin, full adoption or Bulgarian parent, Article 15 | An applicant with the exact documentary basis | Official proof of origin, adoption or parent citizenship under the route | A surname, DNA match or family story proves origin |
| Refugee, asylum, humanitarian or stateless route | A person holding the exact recognised status | Route-specific three-year or five-year period and retained conditions | Every protection status uses the same clock |
| Child or adoption provisions | A minor, child of a Bulgarian or naturalising parent, or person covered by adoption rules | Parentage, age, consent, adoption type and current citizenship record | Every child of a Bulgarian needs adult naturalisation |
| Special interest or merit, Article 16 | A proposal grounded in important state interest or special merit | A competent proposal with concrete reasons and the person's consent | An applicant can buy or nominate this shortcut |
| Restoration or citizenship-status certificate | A former Bulgarian or person unsure whether citizenship was ever lost | Historical nationality facts and the correct legal procedure | Naturalisation is always the right application |
If the answer crosses multiple routes, do not assume the shortest headline route is best. The origin route can be evidence-heavy; a spouse route still requires qualifying residence and language evidence; a person who may already be Bulgarian may need a status certificate rather than naturalisation. A Bulgarian nationality lawyer can help identify the legal question, but nobody can guarantee the decision.
Yes, it can create eligibility to apply under a residence-based route. It does not create citizenship rights automatically. The exact permission, issue history and start date matter more than the number of calendars on the wall.
Article 12 says the ordinary applicant must have had permission for permanent or long-term residence for at least five years by the application date. Article 13 reduces that period to at least three years for its specified groups. The Act does not say that any five years of lawful presence, temporary residence renewals, property ownership or tax residence satisfy this condition.
A person might have lived in Bulgaria for ten years but held permanent residence only recently. Another may have long-term residence recorded under a qualifying basis. Their citizenship clocks are not determined by anecdotes from people who arrived in the same year. If a card was delayed, replaced, reclassified or affected by Withdrawal Agreement documentation, obtain the administrative record rather than guessing.
The current Ministry checklists state that Bulgarian residence information and certain public records may be checked through government systems. This reduces duplicate paper but increases the importance of resolving errors early. Ask the relevant authority how to correct an inaccurate status record before lodging a citizenship file.
Article 12 is the starting point for an adult who has no route removing or changing its conditions. Every element matters, and the Ministry checklist translates those legal elements into current evidence.
The applicant must have reached adulthood. Children and dependent family members use their own statutory provisions and consent rules.
At least five years holding permanent or long-term residence permission at the application date, unless another route validly changes the period.
No disqualifying final Bulgarian conviction for the specified intentional offence and no relevant pending Bulgarian proceeding, subject to the Act's rehabilitation wording.
Income or an occupation sufficient for support. No fixed universal income figure was verified in the current Act or checklist.
Competence evidenced under the Education Minister's procedure, unless the precise route removes the ordinary condition.
Release, or release by the point citizenship is acquired, unless an Article 12(2) exception or another statutory route applies.
The criminal-record condition is not safely summarised as “a clean DBS”. The current Ministry list asks for records connected with the applicant's citizenship and, where applicable, countries of permanent or long-term residence, plus Bulgarian prosecution evidence. The purpose wording, issuing authority, issue date and treatment of spent or rehabilitated matters require route-specific checking. Disclose accurately. A withheld fact can be more damaging than a fact that needed explanation.
The means condition is equally resistant to internet arithmetic. Article 12 uses income or occupation enabling support, while the checklist identifies employment or declared-income evidence. It does not publish one guaranteed bank-balance shortcut. A pensioner, employee, business owner and person with foreign income may need different documents and tax context.
The ordinary rule includes release from existing citizenship. Article 12(2) creates exceptions for spouses of Bulgarian citizens, citizens of EU or EEA states or Switzerland, and citizens covered by a reciprocity treaty. The UK is no longer in the EU, so a British applicant on the ordinary route must not assume the UK rule allowing dual nationality supplies a Bulgarian exemption.
The current Ministry checklist contemplates release evidence or its later production within a specified period following notification of Citizenship Council approval where release is required. That sequencing exists to avoid premature action. It is not a reason to renounce without individual written advice from both sides.
It can reduce the qualifying permanent or long-term residence period from five years to three, but marriage is not automatic citizenship. Two clocks must mature and the other retained conditions still need proof.
Under Article 13, the applicant must have held permanent or long-term residence permission for at least three years. For the spouse ground, the person must also have been legally married to a Bulgarian citizen for at least three years and remain married. A three-year wedding anniversary does not replace the residence clock; three years of ordinary temporary residence does not replace permanent or long-term status.
| Question | What must be established | What does not substitute |
|---|---|---|
| Marriage clock | At least three years of legal marriage to a Bulgarian citizen, continuing at application | Engagement, cohabitation or the date a foreign ceremony was planned |
| Residence clock | At least three years holding permanent or long-term residence permission | Three years on any permit, address registration or property ownership |
| Other conditions | Adult status, criminal eligibility, means and Bulgarian language under the retained Article 12 conditions | The spouse's income, language or citizenship automatically standing in for the applicant |
| Existing nationality | The spouse exception in Article 12(2) removes the ordinary release condition for a qualifying spouse | A general claim that every British applicant can retain British citizenship |
A foreign marriage may first need to be recognised and reflected in the appropriate Bulgarian civil records. Names, previous marriages, divorce dates and transliteration must agree across the marriage, birth, identity and residence documents. A Bulgarian marriage can be checked internally in some administrative workflows, while a foreign certificate may require its own evidential treatment.
Marriage also has a separate immigration role. A spouse may have a family residence path long before citizenship eligibility, but obtaining that residence permission remains a distinct application. The marriage guide explains the civil wedding and family-residence boundary. It cannot accelerate the citizenship clock.
Article 15 can remove the ordinary residence, income, language and nationality-release conditions for specified applicants. In return, identity and family evidence become central. The route succeeds on an official documentary chain, not cultural affinity.
The current Act covers a person of Bulgarian origin, a person fully adopted by a Bulgarian citizen and a person whose parent is a Bulgarian citizen or died as one. These are distinct legal bases. A person with a Bulgarian parent may already have citizenship by origin under Article 8, depending on the facts at birth, so the first task can be proving existing status rather than asking to be naturalised.
DNA can help private family research, but the current statutory route asks for official evidence of the relationship and qualifying origin. A DNA estimate cannot state which Bulgarian legal status an ancestor held. The same caution applies to a Bulgarian surname, a village memory, military photograph, property deed or online family tree.
Article 15's exemptions are substantial: the route removes the ordinary residence-period, means, language and nationality-release conditions identified in the Act. It does not remove the need for a valid application, identity evidence, criminal and security assessment, Bulgarian-language documents, personal submission and interview. “No language condition” does not mean the administrative file can be filed in English.
These routes are often reduced to slogans that are wrong for the individual. Birthplace, parentage, age, consent, protection status and proposal authority change the analysis.
Bulgaria does not have general citizenship by birthplace. Article 10 covers a person born in Bulgaria who does not acquire another citizenship by descent. A child born in a Bulgarian hospital to British parents will normally acquire British citizenship according to UK nationality rules if the relevant conditions are met, so the Bulgarian birthplace alone should not be treated as a passport route.
Article 8 provides citizenship by descent where at least one parent is a Bulgarian citizen. Articles 17 and 18 address children affected by a parent's acquisition and children with one Bulgarian parent in specified circumstances. The process differs for children under 14 and those aged 14 to 18, and can require the child's request or parental consent. Establish whether the child is already Bulgarian, needs civil registration, or needs a citizenship procedure before choosing a form.
Full adoption by a Bulgarian citizen has specific treatment under Article 15 and the child provisions. The final adoption decision, its recognition, the adopter's citizenship and the child's age and consent position matter. An informal care arrangement, guardianship or non-full adoption should not be described as equivalent.
Recognised refugees, people granted asylum, people with humanitarian status and stateless persons have route-specific provisions under Articles 13a and 14. Some use three years of permanent or long-term residence, others five, and the retained conditions differ. Use the precise status decision, not the ordinary-language description “refugee” or “without a passport”.
Article 16 allows naturalisation without the ordinary conditions when Bulgaria has an important interest or the person has special merit in public or economic life, science, technology, culture or sport. It is based on a competent authority's proposal with concrete reasons and the person's prior consent. It is not a route an agent can sell to a normal applicant and it is not proof that fame or investment guarantees nationality.
The former fast-track investment provisions were repealed in 2022. Transitional rules protect only narrow legacy cases connected with earlier qualifying status and maintained investment. A new investor in 2026 should not be offered “Bulgarian citizenship by investment”. Residence options connected with business or investment are separate immigration questions and do not revive a repealed passport route.
Most residence-based naturalisation applicants must prove Bulgarian under the Education Minister's procedure. The official regulation describes normal communication at an elementary level, but it does not simply call the citizenship requirement an A1 multiple-choice test.
The Ministry checklist recognises a prescribed Bulgarian-language certificate or a notarised copy of a Bulgarian primary, secondary or higher-education diploma. A person without qualifying Bulgarian education applies through the current certificate process. The regulation provides for written examinations on an announced monthly schedule and contains adjusted arrangements for specified groups.
The personal citizenship interview is separate from the Education Ministry's language evidence. The application is in Bulgarian and the filing interview follows an approved questionnaire. Even where Article 15 removes the ordinary language condition, the administrative file remains a Bulgarian proceeding. Arrange accurate help with documents without allowing an intermediary to invent an answer about your family or residence history.
Shumen.UK's free 60-day Bulgarian course can build Cyrillic, vocabulary and everyday confidence. It is preparation only. It is not a Ministry certificate, an official mock exam or a promise of a pass. Use official exam-specific material alongside general study.
Sometimes, but never because “the UK allows dual citizenship” is the whole answer. UK law determines whether Britain objects; Bulgarian law determines whether the Bulgarian route requires release from the existing nationality.
| Question | UK position | Bulgarian position |
|---|---|---|
| Can a British citizen hold another nationality? | Yes. The UK permits dual nationality and requires no advance permission. | That UK permission does not remove a Bulgarian statutory release condition. |
| Does ordinary Article 12 require release? | The UK provides a formal renunciation process but does not demand its use. | Normally yes by the acquisition stage, unless an Article 12(2) or route-specific exception applies. |
| Does a Bulgarian spouse matter? | The UK still permits dual nationality. | A spouse of a Bulgarian citizen is named as an exception to the ordinary release condition. |
| Does a UK nationality letter settle it? | GOV.UK provides evidence that British law allows dual nationality. | The letter explains UK law; it does not create a Bulgarian exemption. |
| Which country helps a dual national? | British consular help can be limited in the country of the other nationality. | Bulgarian law generally treats a Bulgarian dual national as Bulgarian in Bulgaria. |
GOV.UK dual-citizenship guidance confirms the general UK position. Its Living in Bulgaria guidance warns that a British applicant may have to renounce depending on the circumstances and that the British Embassy cannot assist with the Bulgarian application. The nationality-letter service can evidence UK law but does not decide Bulgarian law.
The current Ministry checklist for the exact article is the only safe starting list. A general naturalisation pack can include the categories below, but origin, spouse, child, protection and restoration files alter or add evidence.
Application, birth record, passport or identity copy, names and name changes, marriage or adoption evidence where relevant, photograph and CV.
Records from the required citizenship and residence countries, plus the specified Bulgarian prosecution document. Purpose wording matters.
Recorded permanent or long-term status, marriage duration, Bulgarian parent, origin chain, protection decision or other statutory basis.
Employment or declared-income evidence and route-specific checks. Do not substitute an invented minimum bank balance.
Accepted language certificate or Bulgarian diploma where required, and the current LKK medical document named by the checklist.
Current Ministry declarations, consent where relevant, fee evidence and any later nationality-release document required by the route.
British and Bulgarian records can express middle names, patronymics, married names and Cyrillic transliteration differently. A harmless spelling variation to a family may look like two people to an administrator. Make a name matrix showing every version, which record uses it, why it changed and what official document connects the versions.
The same applies to dates and places. A historic village can have several names; an archive record may use a different calendar; a parent's marriage can change the surname linking two birth records. Resolve these issues before legalising a pile of documents, because a corrected source record may make the paid Apostille and translation obsolete.
The current Article 12 list refers to the applicant's citizenship country and, in applicable cases, countries where the applicant has permanent or long-term residence, as well as Bulgarian prosecution evidence. It also specifies that the certificate should identify the citizenship-proceeding purpose. A UK DBS certificate, ACRO police certificate and court record are not interchangeable labels. Ask the Ministry or consular post which current UK document satisfies the named purpose.
Do not conceal a conviction, caution, pending case, changed name or earlier nationality application. The statutory test and rehabilitation rules require legal analysis, while false documents or concealed facts can later support cancellation of naturalisation within the legal framework.
The Article 12 checklist checked on 13 August 2026 states a state fee of EUR 511.29. Treat that as a dated official figure, not the cost of the process. Civil records, police certificates, Apostilles, translations, travel and advice are additional and vary by file.
Work backwards from the Bulgarian recipient's current checklist. The correct chain depends on the exact document, issuing authority, treaty position and accepted translation format. There is no safe blanket instruction to Apostille and translate everything.
Order in the wrong sequence and the work may have to be repeated. Translating before a source correction embeds the mistake. Apostilling a copy where the original was required authenticates the wrong item. Binding a translation in a form another authority does not accept can create a second paid pack.
Our official documents guide explains how to obtain recipient instructions, distinguish Apostille from translation, handle certified copies and diagnose rejection. For citizenship, the current Ministry route checklist remains the receiving authority's instruction.
The Act requires personal submission to the Bulgarian Ministry of Justice or through a Bulgarian diplomatic or consular post. The application and evidence are in Bulgarian, and an interview takes place at filing.
The interview is not merely an identity counter. It uses an approved questionnaire and is part of the application. Be ready to explain the legal basis, residence or family chronology, work and means, links to Bulgaria, names, previous nationalities and any discrepancy in the file. Answer the question asked and do not memorise an agent's embellished narrative.
A lawyer or competent document specialist can identify issues, retrieve records, coordinate lawful translations and prepare a chronology. They cannot replace personal submission, answer the interview for you, alter a statutory condition, instruct a security check or guarantee a decree. Verify the Bulgarian lawyer in the appropriate bar register and define the written scope and fee.
If the application is filed through a diplomatic post, that post forwards the proceeding; it does not become the deciding authority. The British Embassy cannot progress a Bulgarian citizenship application. Use a British nationality adviser only for the British side, such as renunciation or passport consequences.
Article 35 gives periods for a Minister of Justice proposal. It does not promise a complete decision, decree, certificate, identity card or passport by that date. Preparation and evidence requests sit outside the simple headline.
Resolve status dates, parentage, names and the correct checklist. Archive research, police records, Apostilles, translation and language evidence can run on different clocks.
The Ministry or Bulgarian diplomatic post accepts the Bulgarian-language file, conducts the interview and establishes the administrative record.
Authorities check documents, residence, public liabilities, criminal matters, security and route facts. Additional evidence can be requested.
Article 35 states 12 months for ordinary naturalisation and nine months for Bulgarian-origin cases, with other periods for restoration, release and Article 16. The clock runs under the Act's receipt and correction rules.
Citizenship by naturalisation is acquired by decree of the President. A proposal or approval-stage message is not the decree.
The Ministry issues the citizenship certificate and notifies the relevant authorities. Civil registration and Bulgarian identity documents follow through their own processes.
Additional information, incomplete evidence and institutional checks can interrupt movement. Origin files can require a deeper ancestry review. A nationality-release condition can add a carefully sequenced British procedure after the relevant Bulgarian approval stage. Filing through a consular post adds transmission and collection logistics.
Keep the official application number and use the current Ministry status channel. Save evidence of every response and submission. A long quiet period does not prove refusal or approval. If the statutory framework appears not to be moving, obtain Bulgarian administrative-law advice about the actual remedy. Article 35's court mechanism concerning ministerial inactivity is not a court power to award citizenship on the merits.
Most avoidable problems are not exotic legal arguments. They are the wrong route, the wrong residence clock, inconsistent identity records, expired evidence, incomplete disclosure or a change that was never reported.
Article 19 also permits refusal where serious reasons indicate a threat to public order, public morals, public health or national security. This cannot be reduced to a public checklist or a success probability. Criminal and security issues require confidential Bulgarian legal advice, not forum comparisons.
Article 32a requires an applicant to notify the Ministry within one month of a change in relevant facts or circumstances. A move, name change, marriage, divorce, birth, criminal proceeding, nationality change or corrected civil record may be material depending on the route. Send the update through the prescribed channel, identify the file and retain proof.
Naturalisation can be cancelled within the statutory framework where judicially established false information or documents, concealed facts or specified notification failures are involved. Citizenship is too consequential to submit a document you suspect is inaccurate. Pause, verify and correct it.
Obtain the actual Bulgarian decision or status record and identify what legal act occurred. A request for more evidence, terminated file, Minister's non-action, negative proposal and completed refusal are not interchangeable. Appeal rights, deadlines and the court's powers depend on the act. This guide does not publish a generic appeal deadline because that could direct someone into the wrong remedy.
The Presidential decree changes nationality. It does not place every civil record in order, issue a passport instantly, move tax residence or give relatives citizenship without their own legal basis.
Follow the current Ministry collection or delivery procedure. Check names and birth details immediately and preserve certified copies where appropriate.
The relevant Bulgarian municipality and civil systems must hold consistent data before identity documents can be issued smoothly.
Apply through the current Bulgarian identity-document process. The former foreigner residence card does not become the citizen's card.
A passport is a separate application. A British-Bulgarian dual national should carry the documents each country requires for entry and return.
EU free movement and Bulgarian political rights follow nationality, alongside duties under Bulgarian law. Register to vote through the applicable process.
Check each child's and relative's position separately. Parentage may give a child citizenship by origin, but evidence and registration still matter.
A Bulgarian dual national is generally treated as Bulgarian when Bulgarian law applies. That can limit British consular assistance in Bulgaria. Entering or leaving Bulgaria and returning to the UK can involve different document expectations. GOV.UK advises British dual nationals to use appropriate evidence of the right to enter the UK, normally a valid British passport or certificate of entitlement.
A Bulgarian passport does not itself determine where a person is tax-resident. Bulgaria can examine days, permanent home and centre of vital interests; the UK applies its Statutory Residence Test; the double-tax treaty allocates some conflicts. Use the tax guide for the concepts, then obtain cross-border advice for the actual year.
Citizenship also does not erase earlier immigration, tax, social-security or civil-record obligations. Close or update the former residence record through the correct authority, notify institutions that genuinely need the new nationality, and keep the decree and certificate separate from everyday identity copies.
Not everyone with a Bulgarian nationality problem needs naturalisation. A former citizen may seek restoration, a current citizen abroad may seek release, and a person with an uncertain family history may need official proof of existing status.
Articles 26 and 27 govern restoration in specified circumstances. The evidence asks why and how Bulgarian citizenship ceased, the person's current status and whether statutory conditions are met. Restoration is not the same as an origin application and should not be chosen simply because a parent once held a Bulgarian passport.
Article 20 allows a Bulgarian citizen permanently living abroad to request release where the person already has another citizenship or an open procedure to obtain one. Release is a Bulgarian legal proceeding with separate child rules. It should not be confused with a British applicant releasing British citizenship as a condition of ordinary Bulgarian naturalisation.
A person may have acquired Bulgarian citizenship by descent and never lost it even though no current passport exists. The Ministry's citizenship-status certificate route can be more appropriate than asking to be naturalised. Gather parent citizenship records, birth and recognition documents, former passports, emigration and release records, then ask which status procedure fits.
The Act distinguishes release, cancellation of naturalisation and other loss provisions. These have serious consequences for the person and, in some cases, require close analysis of effects on children or statelessness. Never infer that an expired passport means citizenship expired, or that acquiring British citizenship automatically ended Bulgarian citizenship.
The Ministry's citizenship certificate and collection information is the correct starting point for current administrative routes. Historical cases often need archive evidence and individual nationality advice across both countries.
The Bulgarian legal and procedural sources below were checked on 13 August 2026. The Act page recorded amendments through State Gazette issue 55 of 16 June 2026. Current law, forms and route checklists override this summary.
Review schedule: Act amendments, Ministry forms, checklists, fee, booking and language procedure quarterly; British dual-nationality, renunciation and travel-document guidance every six months. Recheck immediately after a State Gazette amendment or Ministry procedure change. Individual criminal, origin, nationality-release and disputed-status issues require current legal advice.
No. Permanent or long-term residence is an immigration status, not nationality. Under the ordinary Article 12 route, an adult normally needs to have held permanent or long-term residence permission for at least five years at the application date and must meet the other criminal-record, means, language and nationality conditions. An application is still examined and citizenship is acquired only by Presidential decree.
No. The Article 13 spouse route normally requires at least three years of legal marriage to a Bulgarian citizen, with the marriage continuing, and at least three years holding permanent or long-term residence. The applicant must also meet the other conditions that Article 13 retains. A qualifying spouse is exempt from the ordinary release-from-existing-citizenship condition, but marriage itself grants neither citizenship nor an automatic residence card.
The UK permits dual nationality, but that does not decide the Bulgarian application. Bulgarian law normally requires release from an existing citizenship on the ordinary route, subject to exceptions including spouses of Bulgarian citizens, EU, EEA or Swiss citizens and treaty-reciprocity cases. A new British applicant should have the exact route checked and should never renounce British citizenship speculatively.
Usually, on the ordinary and marriage-related naturalisation routes. The official procedure accepts prescribed Ministry of Education evidence or a notarised copy of qualifying Bulgarian education. The regulation describes normal communication at an elementary level but does not simply label the test A1. Some routes, including the Article 15 origin or Bulgarian-parent route, remove the ordinary language condition. Check the current route list.
Possibly, where the current Article 15 conditions are met and official documents prove the required link to a Bulgarian-origin ascendant within the statutory degree. A Bulgarian surname, family account, DNA result or property connection is not enough on its own. Build a consistent civil-record chain showing names and relationships, then follow the current Ministry of Justice origin-route checklist.
The Citizenship Act provides for personal submission to the Bulgarian Ministry of Justice or through a Bulgarian diplomatic or consular post. The application and documents are in Bulgarian and an interview takes place when the file is submitted. Use the current route-specific Ministry page and booking instructions because forms, document lists and appointment arrangements can change separately from the Act.
There is no honest guaranteed passport date. Article 35 sets periods for the Minister of Justice to make a proposal, including 12 months for ordinary naturalisation and nine months for Bulgarian-origin cases, calculated from receipt or correction of the file. Additional evidence and checks can interrupt movement, and the Presidential decree stage follows. Document preparation and identity-document steps add more time.
Not by itself. Citizenship, immigration status and tax residence are different legal tests. Bulgarian tax residence can depend on factors such as residence days, permanent home and centre of vital interests, while UK residence is tested separately. A new Bulgarian citizen should review both countries' current tax rules and treaty position rather than assuming the passport decides where income is taxed.