How Tracker and Fixed Mortgages Differ
A tracker mortgage moves automatically with the Bank of England base rate. Most trackers are priced as "base rate plus X%". With base at 4.50% and a common margin of 0.25%, the headline rate today is 4.75%. If the BoE cuts by 0.25% next month, your rate falls to 4.50% the month after, and your monthly payment drops accordingly.
A fixed-rate mortgage locks your rate for a set period, typically 2, 3, 5, 7 or 10 years. Your monthly payment is the same every month regardless of what the BoE does. Today's prime 5-year fixed rates sit at 4.19% to 4.39% depending on LTV and lender.
The critical trade-off is rate risk versus rate opportunity. A fixed rate protects you if rates rise but prevents you benefiting if rates fall. A tracker does the opposite: you benefit from cuts but pay more if rates rise unexpectedly.
Trackers also typically have no ERC, making them much more flexible. Fixed deals almost always have an ERC that steps down over the term. That flexibility is valuable if you anticipate moving, selling or refinancing within the fix period.
The Five-Criteria Decision Framework
Score each criterion honestly. The balance of scores points toward tracker or fixed.
- Rate-cut expectation: Do you believe the BoE will cut rates by 0.5% or more within 12 months? If yes, a tracker beats a fixed deal within the first year. Market consensus currently expects 0.25% to 0.5% of cuts by April 2027.
- Budget resilience: Could you comfortably absorb a 1% rate rise? If not, a fix is safer. The tracker penalty for being wrong is larger than the fixed penalty.
- Flexibility need: Are you likely to move, sell, refinance or receive a lump sum in the next 2 to 3 years? Trackers typically have no ERC, giving you clean exits.
- Active engagement: Will you monitor rates and switch when appropriate? Trackers reward active borrowers; fixed deals suit set-and-forget holders.
- Starting gap: What is the gap between today's best tracker and today's best 5-year fix? If the fix is more than 0.4% cheaper (as in April 2026), the bar for choosing a tracker is higher.
Most borrowers today score toward fixed on criteria 2, 3 (if they have no imminent change) and 5, but toward tracker on 1 and 4. A balanced score favours fixed unless you hold high conviction on rate cuts.
Decision Matrix: Tracker or Fixed
Use this matrix to cross-reference your circumstances against the recommended product type.
| Borrower profile | Rate view | Flexibility need | Recommendation |
|---|---|---|---|
| Tight budget, stable job | Any | Low | 5-year fix at 4.19% to 4.39% |
| High earner, large balance | Expects 0.5%+ cuts | Medium | 2-year tracker, switch to fix when cuts materialise |
| Planning to sell in 12 to 18 months | Any | High | Tracker (no ERC) |
| Receiving inheritance or bonus soon | Any | High | Tracker to preserve overpayment flexibility |
| Self-employed with variable income | Any | Medium | 5-year fix for affordability certainty |
| Mortgage is small (under £100k) | Any | Any | Fix; rate saving on tracker rarely covers switching costs |
| Offset mortgage holder with savings | Any | Any | Tracker (most offset deals are tracker-linked) |
| New-build homeowner with high LTV | Any | Low | 5-year fix to lock affordability |
If more than one row applies, prioritise the one that best captures your biggest risk. Budget constraint almost always overrides rate-view convictions.