Missing 2 years: the maths
If you have 2 qualifying years missing on your NI record, here is what filling them costs and what it earns you back.
2 years at a glance
Total Class 3 cost
2 x £923 per year
£1,846
Weekly SP uplift
£13.78 per week
Annual SP uplift
£716.56 per year
Payback period after SPA
around 2.6 years
20-year lifetime gain
£14,331.20
Class 3 buy-back calculator
Total cost
£1,846.00
Weekly pension uplift
£13.79
Annual pension uplift
£717.01
Payback period
2y 7m
20-year lifetime gain
£14,340.11
When buying 2 years makes sense
- You have at least 2 gap years that fall within the eligible window (typically 6 years back from the current tax year)1
- You have not yet hit the 35-year cap on your forecast
- You expect to live at least 2.6 years past SPA, the rough payback period
- Adding the years actually moves your figure (call the Future Pension Centre before paying)2
Worked example
Person A is 5 years from SPA with 28 qualifying years. Buying 2 additional years now lifts their effective count toward the 35-year cap. At a Class 3 cost of £1,846, the uplift is £716.56 per year. Across a 20-year retirement that is £14,331.2 in extra income.
Adjacent
By Oliver Wakefield-Smith, Founder, Digital Signet.
Rates current for 2026/27 · Verified Q2 2026 · Next refresh after Autumn Budget 2026