Answers · UK 2025/26
How much are mortgage repayments on a £300,000 mortgage?
A £300,000 repayment mortgage at 4.5% over 25 years costs approximately £1,668/month (£500,357 total). At 5%: £1,754/month. 30-year term: £1,520/month at 4.5% — lower monthly but £47k more interest over the term.
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UK £300,000 mortgage repayment table 2025/26. 25-year term: 4.0% £1,584/month (£475,113 total); 4.5% £1,668/month (£500,357); 5.0% £1,754/month (£526,131); 5.5% £1,842/month (£552,484); 6.0% £1,933/month (£579,329). 30-year term: 4.0% £1,432/month (£515,610); 4.5% £1,520/month (£547,219); 5.0% £1,610/month (£579,747); 6.0% £1,799/month (£647,514). 20-year term at 4.5%: £1,898/month (£455,613 total — less interest but tighter monthly). Interest-only at 4.5%: £1,125/month, but £300k principal still owed at end. Affordability: ~4-4.5× household income for £300k = £67-£75k income. ERC for overpayment >10%/year: 1-5%. Overpaying £100/month at 4.5% saves ~£36,000 and clears 5 years early.
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This answer is informational only and does not constitute financial, tax or legal advice. Figures are for the 2025/26 UK tax year. See our methodology and sources.