Fixed Rate vs Tracker Mortgage: Which Is Better?
One gives you certainty. The other could save you thousands — or cost you thousands. Here's how to decide between a fixed rate and tracker mortgage in the UK.
The Quick Answer
Choose a fixed rate if you want predictable monthly payments and can't afford the risk of rate increases. Choose a tracker if you believe interest rates will stay flat or fall, and you can absorb higher payments if they don't. Most first-time buyers and those on tight budgets should fix.
At a Glance
| Feature | Fixed Rate | Tracker |
|---|---|---|
| Monthly payment | Stays the same for the fixed period | Changes when the base rate moves |
| Initial rate | Usually higher (you pay for certainty) | Usually lower (you accept the risk) |
| Rate transparency | Known for the fixed period | Contractual margin over base rate |
| If base rate falls | You miss out (stuck at fixed rate) | Your payments drop automatically |
| If base rate rises | You're protected (payments stay same) | Your payments increase |
| Early repayment charges | Usually 1-5% during fixed period | Often none (or lower) |
| Overpayments | Typically limited to 10%/year | Often unlimited |
| Budgeting | Easy — payments are predictable | Harder — need a buffer for rate rises |
Worked Example: £250,000 Mortgage, 25-Year Term
Comparing a 4.5% fixed rate vs a tracker at base rate (4.5%) + 0.5% = 5.0%, with scenarios for rate changes:
| Scenario | Fixed (4.5%) | Tracker (Base + 0.5%) | Difference |
|---|---|---|---|
| Base rate stays at 4.5% | £1,390/mo | £1,462/mo | Fixed saves £72/mo |
| Base rate drops to 3.5% | £1,390/mo | £1,252/mo | Tracker saves £138/mo |
| Base rate rises to 5.5% | £1,390/mo | £1,681/mo | Fixed saves £291/mo |
| Base rate drops to 2.5% | £1,390/mo | £1,123/mo | Tracker saves £267/mo |
The tracker saves money if rates fall significantly — but exposes you to large payment increases if rates rise. On a £250,000 mortgage, a 1% rate rise adds roughly £140/month. Can your budget absorb that?
When a Fixed Rate Is Better
You're a first-time buyer
Predictable payments help you budget as you adjust to homeownership costs.
You're on a tight budget
If a rate rise of 1-2% would cause financial stress, fix for protection.
Rates are expected to rise
Locking in a lower rate before increases protects you for the fixed period.
You want peace of mind
No surprises. No watching Bank of England announcements nervously.
When a Tracker Mortgage Is Better
You expect rates to fall
If the Bank of England cuts rates, your payments drop automatically — unlike a fixed deal.
You want flexibility
Trackers often have no early repayment charges, making it easy to switch or remortgage.
You plan to overpay
Many trackers allow unlimited overpayments, helping you reduce your mortgage faster.
You're selling soon
If you're only keeping the property for 1-2 years, a cheaper tracker with no ERCs may save money overall.
The Stress Test: Can You Afford a Rate Rise?
Before choosing a tracker, stress-test your finances. Lenders typically check if you can afford payments at 3% above the revert rate. You should run the same test yourself:
Run Your Stress Test
Use our calculators to see how rate changes affect your payments.
Frequently Asked Questions
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