Should I Overpay My Mortgage or Increase My Pension?

Published 29 March 2026 • 8 min read

If you have spare cash each month, the question of whether to overpay your mortgage or boost your pension is one of the most common financial dilemmas. Both reduce your financial burden in retirement, but they work in very different ways. The right answer depends on your mortgage rate, tax band, and how far you are from retirement.

The Maths: Pension vs Mortgage Overpayment

Suppose you have £300 per month spare. Your mortgage rate is 4.5% and your pension is invested in a global equity fund with expected long-term returns of 7% per year.

• Mortgage overpayment: £300/month saves you 4.5% interest, which is guaranteed. Over 15 years, you save roughly £14,000 in interest and pay off your mortgage 4 years early.
• Pension (basic-rate taxpayer): £300/month becomes £375 with 20% tax relief. At 7% growth over 15 years, this grows to approximately £119,000.
• Pension (higher-rate taxpayer): £300/month effectively costs you £180 after 40% tax relief. The same £375 in the pension at 7% over 15 years still grows to £119,000 – but your net cost is far lower.

When to Prioritise the Pension

• You have uncaptured employer matching. If your employer will match additional contributions, this is free money. Always maximise employer matching first.
• You are a higher-rate taxpayer. The 40% or 45% tax relief makes pension contributions exceptionally efficient. See our tax relief guide.
• Your mortgage rate is below 5%. With expected pension returns of 5% to 8%, the pension likely beats a low-interest mortgage over time.
• You are young. The more time your pension has to compound, the greater the advantage over guaranteed mortgage savings.
• You are behind on pension saving. If you are not on track for a comfortable retirement, boosting your pension should be the priority. Read how much pension do I need to check.

When to Prioritise Mortgage Overpayment

• Your mortgage rate is above 6%. At higher rates, the guaranteed interest saving becomes very competitive with uncertain pension returns.
• You are risk-averse. Mortgage overpayment is a guaranteed, risk-free return. If market volatility keeps you awake at night, the peace of mind is valuable.
• You are close to retirement. If you retire with a mortgage, your required retirement income is higher. Clearing the mortgage before retirement reduces the pressure on your pension pot.
• You have already hit your Annual Allowance. If you have maxed out the £60,000 pension allowance, additional savings cannot go into a pension.
• Psychological benefit. Being mortgage-free gives many people a sense of security and freedom that the numbers alone do not capture.

The Best of Both Worlds

You do not have to choose one or the other. A balanced approach often works best:

1. First, contribute enough to your pension to capture the full employer match
2. Second, if you are a higher-rate taxpayer, increase pension contributions for the 40%+ tax relief
3. Third, split any remaining surplus between mortgage overpayment and additional pension or ISA savings

This approach builds your pension pot while gradually reducing your mortgage, giving you flexibility and diversification. For ideas on combining different savings vehicles, see our pension and ISA combined strategy guide.

Key Takeaways

• Always capture employer pension matching first – it is free money
• Higher-rate taxpayers almost always benefit more from pension contributions than mortgage overpayment
• If your mortgage rate is below 5%, the pension likely wins mathematically over the long term
• Mortgage overpayment offers a guaranteed, risk-free return and psychological comfort
• A balanced approach – boosting both pension and mortgage payments – is often the most sensible strategy
• Consider your time horizon, risk tolerance, and retirement readiness when deciding