What the CF83 is and how to file it
The CF83 is HMRC's application form for paying voluntary National Insurance from abroad. Gaps in your record while overseas reduce your State Pension, and voluntary contributions fill them: you need 35 qualifying years for the full new State Pension of £241.30 a week in 2026/27 where your record started after April 2016, and a minimum of 10 years to get anything at all. The form can now be completed online through GOV.UK, confirming your identity with photo ID such as a UK passport or driving licence, and you will need your National Insurance number, your addresses in the UK and abroad, your employment history and how long you have been, or expect to be, outside the UK. One hard restriction: HMRC cannot process a CF83 if you are over State Pension age or within 6 months of reaching it, in which case GOV.UK directs you to the International Pension Centre. Once accepted, HMRC writes confirming the amounts you can pay and the payment dates, and the date that matters for the transitional rules is the date you submitted, not the date HMRC processes it.
The April 2026 change: Class 2 has gone
From 6 April 2026 voluntary Class 2 contributions were abolished for periods abroad, so for the 2026/27 tax year onwards the only route for most people overseas is Class 3, apart from narrow exceptions for self-employed people covered by certain social security agreements and volunteer development workers. The cost difference is stark: Class 3 is £18.40 a week (£956.80 a year) against £3.65 a week (£189.80 a year) for Class 2, a gap HMRC's own policy paper puts at £767 a year. Eligibility tightened too. New applicants for 2026/27 onwards must have either lived in the UK for at least 10 years in a row or paid at least 10 years of qualifying contributions, and credits do not count; the old test was 3 years. Even at the higher price the economics usually hold: one extra qualifying year typically adds roughly £358 a year to the new State Pension, so a Class 3 year is normally recovered within about three years of retirement. Check your State Pension forecast before paying anything, because extra years add nothing once you are on course for the full amount.
The 5 April 2027 deadlines
The transitional window is what makes timing urgent. If you were already paying Class 2 from abroad, your liability closed with 2025/26, but you can apply to pay Class 3 without meeting the new 10-year test as long as your application goes in before 6 April 2027, and you can still sweep up pre-April 2026 gaps at the cheap Class 2 rate while the time limits allow. If your CF83 was submitted on or before 5 April 2026 for 2024/25 or 2025/26, you keep the previous rules, provided the contributions are paid on or before 5 April 2027. The general back-payment window also bites at the same date: you can usually fill gaps for the previous 6 tax years, so 2020/21 gaps generally need paying by 5 April 2027. Miss these dates and the cheaper routes close for good. Horizon reviews National Insurance records and the abroad rules as part of its leaving-the-UK work, and a short review is far cheaper than paying for years that add nothing.