Comparison · Mortgages & Pensions · 2026
Overpaying Your Mortgage vs Pension AVCs 2026: Where Should Spare Cash Go?
If you have spare cash each month, two of the most common destinations are mortgage overpayments and Additional Voluntary Contributions (AVCs) into your workplace pension. Both have real advantages: overpaying guarantees interest saved and reduces debt now, while AVCs via salary sacrifice unlock tax and National Insurance relief but lock the money away until retirement age. This guide compares both using 2026/27 figures.
TL;DR -- 30-Second Summary
- • AVCs via salary sacrifice save income tax (20%/40%) and employee NI (8%/2%) — a large immediate boost
- • Pension money is locked until age 55, rising to 57 from April 2028
- • Mortgage overpayment saves interest immediately at your mortgage rate — a guaranteed, known saving
- • Most lenders cap penalty-free overpayments around 10% of the balance per year — check your deal
- • Overpaying can also improve your LTV band, unlocking better rates at remortgage
Side-by-Side Comparison
| Feature | Mortgage Overpayment | Pension AVC (salary sacrifice) |
|---|---|---|
| Immediate tax/NI relief | None — paid from taxed income | Yes — 20%/40% tax and 8%/2% NI avoided |
| Return / saving | Guaranteed — equal to your mortgage rate | Tax-free growth, but investment growth not guaranteed |
| Access to the money | Locked into home equity, but improves borrowing position | Locked until age 55 (57 from April 2028) |
| Annual limits | Often capped around 10% of balance penalty-free | Subject to Annual Allowance rules |
| Effect on LTV / remortgage | Only overpayment reduces your mortgage LTV band directly | |
Worked Example: An Extra GBP 200 a Month
Consider a basic-rate taxpayer earning between GBP 12,570 and GBP 50,270, paying 20% income tax and 8% employee NI in 2026/27, deciding between overpaying their mortgage by GBP 200 a month or sacrificing GBP 200 of gross salary into an AVC. The mortgage overpayment figures assume an illustrative mortgage rate; the pension figures use only the tax and NI relief, with any further investment growth clearly labelled as an illustrative assumption, not a guarantee.
| Measure | Mortgage overpayment | AVC via salary sacrifice |
|---|---|---|
| Amount committed monthly | GBP 200 (from take-home pay) | GBP 200 gross sacrificed |
| Actual cost to take-home pay | GBP 200 | about GBP 144 (28% relief: 20% tax + 8% NI) |
| Value delivered | GBP 200 off the mortgage balance | GBP 200 into the pension (more if employer passes on its NI saving) |
| Over 10 years (illustrative, undiscounted) | GBP 24,000 off balance, plus interest saved at your mortgage rate | GBP 24,000 contributed for about GBP 17,280 of take-home cost, before any investment growth |
The AVC route delivers more pension value per pound of take-home pay given up for a basic-rate taxpayer, and the gap is larger still for a higher-rate taxpayer at 40% tax and 2% NI. The mortgage overpayment route delivers a fully guaranteed, immediate saving on interest with no lock-in beyond the property itself. Neither figure includes investment growth or mortgage rate changes, both of which materially affect the real-world outcome.
When Mortgage Overpayment Wins
Overpaying tends to win when you value certainty and flexibility over tax efficiency: the interest saved is guaranteed and known in advance, you reduce monthly outgoings once the mortgage is cleared, and a lower LTV can qualify you for better rates at your next remortgage. It also suits people who may need access to funds sooner than pension age, since equity built up through overpayment can potentially be released via remortgaging or selling, subject to lender rules and market conditions.
It is particularly attractive if you are close to retirement without adequate pension provision being the priority, or if the psychological and practical value of being mortgage-free outweighs the tax relief available through AVCs.
When Pension AVCs Win
AVCs tend to win when tax and National Insurance relief is significant, particularly for higher-rate taxpayers, and when you already have adequate emergency savings and are comfortable not accessing the money until at least age 55 (57 from April 2028). If your employer passes on some or all of its own NI saving from salary sacrifice as an extra pension contribution, the advantage grows further, effectively adding free money on top of your own contribution.
AVCs also make sense if you are behind on pension saving relative to your retirement goals, since the combination of tax relief and, potentially, long-term investment growth can build a larger pot for the same take-home cost than paying down a low-rate mortgage. Always check your Annual Allowance position before committing to significant extra pension contributions.