Filling Gaps with Voluntary Class 3

Key facts

Class 3 voluntary contributions cost £17.45 per week (£907.40 per year) in 2025/26.
You can normally fill gaps going back six tax years from the current year.
An extended deadline has allowed people to fill gaps back to April 2006 — check GOV.UK for current position.
Each qualifying year adds approximately £328.64 per year to your State Pension.
Always check your State Pension forecast before paying — you may already have enough qualifying years.

What Are Voluntary Class 3 Contributions?

Class 3 National Insurance contributions are voluntary payments you can make to fill gaps in your NI record. They do not provide entitlement to any benefits other than the State Pension, but they are a straightforward way to ensure you get the maximum pension possible.^[1]

Class 3 is designed for people who:

Were not working or earning enough to pay NI in certain years
Lived abroad and did not maintain UK NI contributions
Were self-employed with very low profits and did not pay voluntary Class 2
Took a career break and were not receiving NI credits

Class 2 vs Class 3: If you were self-employed during the gap year, you may be able to pay voluntary Class 2 instead, which costs only £3.45 per week. Class 2 is much cheaper, so always check whether it’s an option before paying Class 3.^[4]

Current Rates

Tax Year	Weekly Rate	Annual Cost (52 weeks)
2025/26	£17.45	£907.40
2024/25	£17.45	£907.40
2023/24	£17.45	£907.40
2022/23	£15.85	£824.20
2021/22	£15.40	£800.80
2020/21	£15.30	£795.60

Source: GOV.UK^[1]

Older years cost less. If you’re filling a gap from 2018/19, you pay the rate that applied in that year, not the current rate. This makes older gaps even better value.

Time Limits for Filling Gaps

The normal rule is that you can pay voluntary contributions for gaps in the last six tax years. For example, in 2025/26 you could normally fill gaps back to 2019/20.^[1]

However, the government introduced an extended deadline:

Until 5 April 2025, you can fill gaps going all the way back to 2006/07
This extension was originally set to end on 31 July 2023, then extended to 5 April 2025
After the extended deadline passes, you revert to the normal six-year rule

Act soon if you have old gaps. If you have gaps from before 2019/20, check now whether the extended deadline is still available. Once it closes, those older years cannot be recovered.

Cost vs Benefit Analysis

Before paying voluntary contributions, it’s essential to weigh the cost against the benefit:^[3]

Factor	Detail
Cost of one year (2025/26)	£907.40
Extra pension per year	Approximately £328.64
Break-even point	Approximately 2.8 years of receiving State Pension
Average retirement length	Over 20 years (ONS data)
Lifetime gain (20 years)	Approximately £6,573 extra pension for £907 invested

Voluntary Class 3 contributions are generally excellent value if:

You have fewer than 35 qualifying years and won’t reach 35 through future work alone
You’re within a few years of State Pension age
You have gaps from years when rates were lower (even better value)

They may not be worth it if:

You already have 35 qualifying years (or will reach 35 through future work)
You have many working years ahead and expect to reach 35 naturally
You qualify for NI credits that could fill the gap for free

How to Pay

To pay voluntary Class 3 contributions:^[2]

Check your NI record — identify which years have gaps at gov.uk/check-national-insurance-record
Check your State Pension forecast — confirm that filling the gap will actually increase your pension at gov.uk/check-state-pension
Contact HMRC — call the NI helpline on 0300 200 3500 or write to the NI Contributions Office to confirm the cost
Make payment — you can pay by:
- Direct debit (ongoing quarterly or six-monthly)
- Bank transfer to HMRC
- Cheque posted to the NI Contributions Office

Future years: If you want to pay Class 3 for the current tax year on an ongoing basis (for example, because you’re not working), you can set up a direct debit. Contact HMRC to arrange this.^[2]

Class 3 vs NI Credits

Before paying Class 3, check whether you’re entitled to free NI credits for the gap year. Common sources of credits include:

Situation	Credit Type	Cost
Claiming Universal Credit	Automatic Class 3 credit	Free
Claiming Jobseeker’s Allowance	Automatic Class 1 credit	Free
Claiming Child Benefit (child under 12)	Automatic Class 3 credit	Free
Registered as a carer	Carer’s credit	Free
On jury service	Class 3 credit	Free
None of the above	Voluntary Class 3	£17.45/week

Frequently Asked Questions

How much does it cost to buy a year of voluntary Class 3 NI?

In 2025/26, voluntary Class 3 contributions cost £17.45 per week, which is £907.40 for a full year. Rates for earlier years may be lower — HMRC will tell you the exact cost when you enquire.

How far back can I fill gaps?

Normally you can fill gaps from the last six tax years. However, the government extended the deadline to allow gaps back to 2006/07 to be filled — the latest extension is to 5 April 2025. Check GOV.UK for the most current deadline.

Is it worth paying voluntary Class 3 contributions?

If each extra qualifying year adds approximately £328.64 per year to your State Pension and costs £907.40 to buy, you recoup your investment in under three years of retirement. For most people, it is well worth it — but always check your forecast first.

How do I pay voluntary Class 3 contributions?

Contact HMRC on the NI helpline (0300 200 3500) or write to the NI Contributions Office. They will confirm which years you can fill and how much it will cost. You can pay by direct debit, bank transfer, or cheque.

Sources

Voluntary National Insurance — GOV.UK
Pay voluntary Class 3 National Insurance — GOV.UK
Check your State Pension forecast — GOV.UK
National Insurance: introduction — GOV.UK

Filling Gaps with Voluntary Class 3 NI Contributions