Even a small difference in your mortgage interest rate can cost or save you tens of thousands of pounds over the life of a loan. In this guide, we’ll show you exactly how to compare mortgage rates correctly, what to look for beyond the headline figure, and how to use real numbers to make the best decision for your situation.
Why the Headline Rate Isn’t Enough
Most people compare mortgages by headline rate alone — but this is a mistake. A mortgage with a 4.1% rate and a £2,000 arrangement fee might cost more over two years than a 4.3% rate with no fee. The only accurate way to compare is to calculate the total cost over the full deal period, including all fees.
How a 1% Rate Difference Affects Your Mortgage
| Loan Amount | Rate 4% | Rate 5% | Extra Monthly Cost | Extra Total Cost (25yr) |
|---|---|---|---|---|
| £150,000 | £791/month | £877/month | +£86/month | +£25,800 |
| £200,000 | £1,056/month | £1,169/month | +£113/month | +£33,900 |
| £250,000 | £1,319/month | £1,462/month | +£143/month | +£42,900 |
| £300,000 | £1,583/month | £1,754/month | +£171/month | +£51,300 |
| £400,000 | £2,111/month | £2,338/month | +£227/month | +£68,100 |
Fixed vs Tracker Mortgages
| Mortgage Type | Rate Type | Benefit When | Risk When |
|---|---|---|---|
| 2-Year Fixed | Fixed | Rates rise | Rates fall sharply |
| 5-Year Fixed | Fixed | Rates stay high or rise | Rates fall significantly |
| Tracker | Follows base rate | Rates fall | Rates rise |
| Standard Variable (SVR) | Variable (lender sets) | Flexible exit | Usually most expensive |
2-Year vs 5-Year Fixed: Which Should You Choose?
Choose a 2-year fix if: You expect rates to fall in the next 2–3 years, you’re planning to move, or you want flexibility sooner.
Choose a 5-year fix if: You want payment certainty for longer, you’re risk-averse, or you believe rates will stay elevated.
How to Get the Best Mortgage Rate
- Improve your credit score — Pay all bills on time, reduce credit card balances, avoid new credit applications 3–6 months before applying
- Increase your deposit — Moving from 10% to 25% deposit can significantly drop your rate
- Use a whole-of-market broker — Brokers access deals unavailable direct to consumers
- Don’t focus only on rate — A slightly higher rate with lower fees and flexible overpayment terms may save more money overall
Mortgage Rate Comparison FAQ
How often should I remortgage?
Remortgage whenever your current deal ends — typically every 2 or 5 years. When your deal ends, you’ll roll onto the lender’s Standard Variable Rate (SVR), which is almost always significantly higher. Start looking 3–6 months before your current deal expires.
What is a good mortgage rate in 2026?
A competitive 5-year fixed rate for borrowers with a 20–25% deposit sits between 3.9–4.5%. For 10% deposits, expect 4.5–5.2%. Rates are highly personal — always use a broker to find the full range available to you.
Does a longer mortgage term mean lower monthly payments?
Yes — but a longer term means paying far more total interest. A £200,000 mortgage at 4.5% costs £1,111/month over 25 years (total interest: £133,380) versus £879/month over 35 years (total interest: £169,192). Use our mortgage calculator to compare.
Related Calculators
- Mortgage Calculator — Compare monthly payments at different rates
- Loan Calculator — Calculate costs on personal and secured loans
- Savings Calculator — Build your deposit faster