How UK Mortgage Repayments are Calculated
A mortgage is typically the biggest financial commitment you will make. When you take out a capital repayment mortgage in the UK, each monthly payment is divided into two components: paying off the interest charged and repaying a portion of the original capital borrowed.
📌 Key Rules for UK Mortgages in 2026:
- Bank of England Base Rate: 3.75% (April 2026).
- Average 2-Year Fixed Rate: 4.2% – 5.0% depending on LTV.
- Typical UK Mortgage Term: 25 to 30 years (longer 35-year terms reduce monthly payments but increase total interest).
Monthly Payments at 4.5% Interest across Different Terms
| Loan Amount | 20-Year Term | 25-Year Term | 30-Year Term |
|---|---|---|---|
| £150,000 | £949 / mo | £834 / mo | £760 / mo |
| £200,000 | £1,265 / mo | £1,112 / mo | £1,013 / mo |
| £250,000 | £1,582 / mo | £1,390 / mo | £1,267 / mo |
| £300,000 | £1,898 / mo | £1,668 / mo | £1,520 / mo |
Repayment vs. Interest-Only Mortgages
With a capital repayment mortgage, your balance decreases every single month, guaranteeing the mortgage is fully cleared by the end of the term. With an interest-only mortgage, your monthly payments are lower because you only cover the interest, but you must have a proven repayment vehicle (investments, pension, endowment) to pay off the capital lump sum at the end.
Frequently Asked Questions
What are the monthly payments on a £200,000 mortgage in the UK? +
At 4.5% interest on a 25-year repayment mortgage, the monthly cost is £1,112. Over 30 years, it falls to £1,013/month.
How does my deposit size affect my mortgage interest rate? +
The larger your deposit, the lower your Loan-to-Value (LTV) ratio. Lenders consider borrowers below 75% or 60% LTV as lower risk, which unlocks their cheapest fixed-rate deals.