How to Fill Out and Submit Form CF83: Sections, Submission, and Payment

To fill out Form CF83, gather your National Insurance number, UK and overseas address history, employment details before and after leaving the UK, and one accepted photo ID, then work through the form’s seven sections and submit it either through HMRC’s online service or by post to PT Operations North East England in Newcastle. The form covers both ongoing voluntary contributions and requests to fill gaps in past tax years, and one set of answers determines which contribution class and rate HMRC assigns you.¹

Check You Qualify Before You Start

Eligibility changed on 6 April 2026. For the 2026 to 2027 tax year onward, Class 2 contributions are no longer available for periods abroad, and Class 3 is the only option going forward. To apply for Class 3, you must have either lived in the UK for at least 10 consecutive years or paid 10 qualifying years of National Insurance contributions in total.²

For tax years up to and including 2025 to 2026, you can still apply for Class 2 or Class 3 if you met the conditions in Regulation 147 of the Social Security (Contributions) Regulations 2001.³ The rates for 2026 to 2027 are £3.65 per week for Class 2 and £18.40 per week for Class 3.⁴

You must also be under State Pension age. That age is rising from 66 to 67 between 2026 and 2028, so use the GOV.UK checker to confirm yours.⁵ The standard backdating window is six tax years, with each deadline falling on 5 April.⁶ Once a year falls outside that window, the gap is permanent, so don’t sit on a partly completed form.

What to Gather Before You Open the Form

Pulling this together first will save you having to save and return.

Your National Insurance number: two letters, six numbers, and a final letter, for example QQ 12 34 56 B.⁷
Your last UK address and the date you left the country.
How many consecutive years you lived in the UK before leaving, and how many full years of contributions you paid.
Your last UK employer’s name and address, whether you were employed or self-employed, and whether you were receiving Jobseeker’s Allowance or Child Benefit before departure.
Every country you have lived in since leaving the UK, with dates, plus the names and addresses of any overseas employers and the start and end dates for each role.
Your preferred payment method: Direct Debit, annual payment, or through an agent.⁸
For online applicants: a phone with a working camera and one accepted photo ID — a UK passport, UK photocard driving licence, non-UK biometric passport, UK biometric residence permit, UK biometric residence card, or UK Frontier Worker permit.¹

If you’re applying for Class 2 for past tax years when you were working abroad, you may also need profit and loss accounts or simplified three-line accounts showing gross earnings, total expenses, and net profit or loss.⁹

Working Through the Seven Sections

The form is divided into seven sections, and the online service asks for essentially the same information as the paper version.¹⁰

Section 1: About You

Enter your full name, National Insurance number, date of birth, and your UK address if you still have one. Two questions in this section decide your eligibility: how many consecutive years you lived in the UK before going abroad, and how many full years of National Insurance you paid before leaving. Check your NI record rather than estimating. Wrong numbers here can produce the wrong outcome.

Section 2: About Your Periods Abroad

Give the date you left or plan to leave the UK, every country you have lived in since, and the dates for each. Enter your current overseas address and confirm which address HMRC should use for correspondence. State whether you are applying for ongoing future contributions, to fill past gaps, or both. If you have already been paying voluntary Class 2 or Class 3 in recent tax years, confirm that here.

Sections 3 and 4: Employment in the UK and Abroad

Section 3 covers your UK employment before departure: whether you were employed, self-employed, or neither, the name and address of your last UK employer, and whether you were on Jobseeker’s Allowance or receiving Child Benefit. Section 4 mirrors that for overseas work. List every foreign employer with address and dates, and note any periods of self-employment abroad. HMRC uses these entries to decide which contribution class and rate apply to each period, so gaps or vague dates can slow things down.

Section 5: Volunteer Development Workers

Skip this section unless you work as a volunteer development worker. If you do, enter your salary or wages and whether you are paid weekly or monthly. Include all cash allowances from your employer, but not benefits in kind or allowances from other sources.¹

Sections 6 and 7: Payment and Declaration

Choose your payment method. If you’re using an agent, provide their name and address. If you’re paying by Direct Debit, indicate how you want any gaps in the current tax year handled. Then sign and date the declaration.

Submitting the Form

Online

HMRC’s online CF83 service is generally faster than post and avoids the risk of documents going astray in international mail. You’ll need a phone with a working camera and one of the accepted photo IDs.¹

By Post

If you can’t use the online service, print and complete the paper CF83, sign the declaration, and post it to:

PT Operations North East England
HM Revenue and Customs
BX9 1AN
United Kingdom¹⁰

Use a tracked international mailing service. The form carries your NI number and personal details, and replacing a lost application means starting over.

Choosing How to Pay

Once HMRC approves your application, you pick from three payment methods.⁸

Direct Debit runs from a UK or Channel Islands bank or building society account. Class 3 contributions are collected monthly in arrears, on or within three working days of the second Friday of each month. If the rate changes in April, the new amount is debited automatically. The Direct Debit continues until you cancel it or reach State Pension age.
Annual payment covers a complete tax year in arrears. HMRC writes to you each year with the amount owed and the deadline.
Agent payment means someone else pays on your behalf. Provide their name and address on the form.

If you don’t have a UK bank account, the annual payment route is the practical choice. HMRC sends payment instructions directly.

After You Submit

HMRC reviews the application and writes back to confirm whether you qualify, which class and rate apply, and the total owed for any past gaps. Processing has historically taken several months, particularly for postal applications. The GOV.UK CF83 page shows current estimated response times.¹

If your application is refused, the letter explains why. Common reasons are not meeting the residency or contribution thresholds, incomplete overseas employment history, or applying for a class you’re not eligible for. If you applied for Class 2 for past years and HMRC finds you didn’t meet the conditions — for example, you weren’t working abroad during those periods — they may offer Class 3 as an alternative at the higher rate.

1
GOV.UK. Apply to Pay Voluntary National Insurance Contributions for Periods Abroad (CF83)
2
GOV.UK. Voluntary National Insurance: If You Live or Work Abroad
3
GOV.UK. National Insurance Manual – NIM71150
4
GOV.UK. Voluntary National Insurance: Rates
5
GOV.UK. Check Your State Pension Age
6
nidirect. Voluntary National Insurance Contributions
7
GOV.UK. Your National Insurance Number
8
HM Revenue & Customs. Guidance on Social Security Abroad: NI38
9
GOV.UK. Pay Voluntary Class 2 National Insurance Contributions If You Do Not Pay Through Self Assessment
10
HM Revenue and Customs. CF83 Application to Pay Voluntary National Insurance Contributions Abroad