Should I Overpay My Mortgage or Save?
When mortgage overpayments make sense, when saving is better, and how to compare the two options.
Try the Mortgage Overpay vs Save Calculator
The basic rule
If your mortgage interest rate is higher than the interest rate on your savings (after tax), overpaying your mortgage usually saves you more money. But it’s not always that simple.
When overpaying makes sense
- Your mortgage rate is higher than your savings rate
- You want guaranteed savings (interest reduction is certain)
- You have already built an emergency fund
- You want to be mortgage-free sooner
When saving may be better
- Your savings rate exceeds your mortgage rate (though rates can change)
- You need access to the money (overpayments are hard to get back)
- You do not have an emergency fund yet
- You are using ISAs or other tax-efficient savings
Impact of rates and liquidity
A key difference: mortgage interest saved is guaranteed. Savings interest can change. Also, money overpaid on a mortgage is locked away — you cannot easily access it if you need cash for an emergency.
Check your mortgage terms
Before overpaying, check:
- Is there an early repayment charge (ERC)?
- Is there an annual overpayment limit (typically 10% of the balance)?
- Can you make lump-sum and/or regular overpayments?
Try the calculator
Use our Mortgage Overpay vs Save Calculator to compare the numbers for your situation.
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Last updated
Last reviewed: 2026-04-12T13:47:06.590Z.