British Citizenship by Naturalisation (Form AN)
Official requirements for adult foreign nationals applying for naturalisation under the British Nationality Act 1981.
Checked against official Immigration Rules & GOV.UK guidance on 2026-10-30
Naturalisation under Section 6 of the British Nationality Act 1981 is the primary vehicle for adult immigrants to become British citizens. The statutory requirements vary depending on whether you are married to a British citizen.
Section 6(1) vs Section 6(2) (Spouse of British Citizen)
- Standard Route (Section 6(1)): Must have lived in the UK for 5 years; must have held ILR or Settled Status for at least 12 months; maximum 450 days absence across 5 years, and max 90 days absence in the final 12 months.
- Spouse of a British Citizen (Section 6(2)): Must have lived in the UK for 3 years; can apply immediately upon receiving ILR (no 12-month wait); maximum 270 days absence across 3 years, and max 90 days in the final 12 months.
The Good Character Requirement
The Home Office conducts thorough checks on tax compliance with HMRC, criminal records, bankruptcy, driving offences, and immigration compliance. Failing to disclose a minor motoring offence or penalty is treated as deception and leads to a mandatory 10-year citizenship refusal.
Key Requirements & Highlights
- Section 6(1): 5-year residence + 12 months ILR + max 450 days absence.
- Section 6(2): 3-year residence + immediate ILR + max 270 days absence.
- Requires 2 referees: one of professional standing, one British citizen aged 25+.
- Passing Life in the UK test and B1 English language requirement.
Step-by-Step Application Timeline
- Referees SelectionSecure two eligible referees who have known you personally for at least 3 years.
- Online Form ANComplete online application, upload documents, and pay £1,580 fee + ceremony cost.
- BiometricsAttend UKVCAS appointment to verify passport and identity.
- Ceremony & PassportSwear oath at citizenship ceremony, receive certificate, and apply for your first British passport.
Frequently Asked Questions
What happens if my absences exceed 450 days?
The Home Office exercises discretion to overlook excess absences if they are under 480 days, or if they were caused by postings abroad, serious medical treatment, or unavoidable travel restrictions.
Need Guidance on Your Application?
Priyanshu Decodes provides clear route explanations, document planning, and consultation calls. For regulated legal advice or formal Home Office representation, always consult an IAA-registered adviser or an immigration solicitor.