Fixed Rate Mortgage Break-Even: When to Fix
Verdict
The fix (4.5%) is cheaper than the current tracker (5.24%).
Confidence: High
Break point: Tracker wins only if BOE cuts rates by 0.74pp or more.
The rate decision
The tracker starts cheaper at current BOE rates — but every 0.5% rise erodes that advantage and the fixed rate gives certainty.
The fixed rate of 4.5% provides a clear financial advantage over the current tracker rate of 5.24%, as it ensures consistent monthly payments and eliminates the uncertainty associated with potential rate fluctuations. By locking in the lower fixed rate, borrowers can effectively mitigate the risk of rising interest rates that could increase their payment obligations under the tracker. This stability in payment structure not only aids in budgeting but also protects against future economic volatility, making the fixed rate the superior choice for those prioritizing financial predictability.
The rate backdrop
The fixed rate locks in certainty; the tracker passes every BOE move directly to your monthly payment.
In the current Bank of England base rate environment, where the base rate stands at 4.5%, opting for a fixed-rate mortgage is financially advantageous compared to a tracker mortgage, which is currently priced at 5.24%. This disparity arises from the inherent tracker risk, as tracker rates are directly linked to the base rate and can fluctuate with future monetary policy decisions, potentially leading to higher payments if rates rise further. Given the uncertainty surrounding inflation and economic conditions, locking in a fixed rate at 4.5% provides stability and predictability in monthly payments, making it a more cost-effective choice in the present landscape. Consequently, borrowers may find that the fixed rate not only offers immediate savings but also shields them from potential future increases in borrowing costs associated with tracker products.
Worked example
Assumptions (illustrative): £200,000 mortgage · Fixed 4.5% vs Tracker 5.24%
| Option | Monthly payment | After 0.5% rise |
|---|---|---|
| Fixed (4.5%) | £1,112 | £1,112 (unchanged) |
| Tracker (5.24%) | £1,197 | £1,257 |
At current rates, the fixed is cheaper by £86/month. A 0.5% BOE rise would move the tracker to £1,257/month.
When this flips
This flips only when BOE rates move by more than 2.0pp in the direction that disadvantages the current choice. The certainty value of the fixed rate at 4.5% is high.
What to do next
| Your situation | Action | Why |
|---|---|---|
| Market tracker above the break-even | Fix wins | Tracker has crossed the threshold — fixed becomes cheaper |
| Market tracker below the break-even | Tracker wins | Tracker stays below the threshold — fixed loses money |
| Tipping point within 12 months | Review at trigger | Break-even flip-point is near — revisit before your next rate event |
| Deep cut past the break-even | Tracker compounds | Past the crossover, every cut widens the tracker advantage |
Which option wins for your situation
Sources and provenance
- boe_mpr_2026_02.pdf
- fg23-2.txt
Data as of: 2026-04-25
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