Fixed vs tracker mortgage — UK 2026/27
With BoE base rate at 3.75% and markets pricing in further cuts, the fixed-vs-tracker decision matters more than usual. Fixing locks in certainty at today's rates; tracker rides the BoE base rate down (or up). Five-year fixes typically beat trackers if rates stay flat; trackers win if base rate falls 1%+ over the next 18 months. Here's the honest framework for choosing.
Current UK mortgage rates (2026/27)
Bank of England base rate: 3.75% (as of 14 May 2026).
Typical UK mortgage rates by product type (approximate, will vary by LTV, lender and applicant):
| Product | Typical rate (75% LTV) | Typical rate (90% LTV) |
|---|---|---|
| 2-year fix | ~4.5% | ~5.0% |
| 5-year fix | ~4.3% | ~4.7% |
| 10-year fix | ~4.5% | ~5.0% |
| Lifetime tracker (base + margin) | base + 0.5% = 4.25% | base + 0.85% = 4.6% |
| 2-year tracker | base + 0.4% = 4.15% | base + 0.75% = 4.5% |
| Standard Variable Rate (SVR) | ~7-8% | ~7-8% |
How fixed-rate mortgages work
A fixed-rate mortgage locks the interest rate for a defined period (typically 2, 3, 5 or 10 years). During the fix:
- Monthly payment is predictable
- Insulated from BoE base rate moves — up OR down
- Early Repayment Charge (ERC) typically 1-5% if you pay off the mortgage during the fix
- Overpayments allowed up to a limit (usually 10%/year)
- At end of fix, mortgage reverts to lender's SVR (typically 3-4% above base rate) — remortgaging is normal before this
How tracker mortgages work
A tracker mortgage's rate is tied to BoE base rate plus a margin set by the lender. If base rate changes, your tracker rate changes accordingly.
- Lifetime tracker: tracks base rate for the full mortgage term
- 2-year / 3-year tracker: tracks for the defined period, then reverts to SVR
- "Capped tracker": rate can't rise above a defined ceiling (rare in UK)
- "Collared tracker": rate can't fall below a defined floor (sometimes appears in small print of older trackers)
The margin is set at outset and stays constant. So a "base + 0.5%" tracker at base rate 3.75% pays 4.25%. If base rate cuts to 3.5%, the tracker rate becomes 4.0% — passed through directly.
Economic comparison: which is cheaper?
The answer depends entirely on what BoE base rate does over the term. Three scenarios for a £200,000 mortgage, 25-year repayment, 75% LTV:
Scenario A: Base rate stays at 3.75% for 5 years
- 5-year fix at 4.3%: monthly payment ~£1,090; 5-year total £65,400
- Tracker base+0.5% = 4.25%: monthly payment ~£1,085; 5-year total £65,100
Tracker wins by £300 over 5 years. Marginal.
Scenario B: Base rate falls to 2.5% gradually over 18 months, stays there
- 5-year fix at 4.3%: monthly payment unchanged at £1,090; 5-year total £65,400
- Tracker: rate falls from 4.25% to 3.0% over 18 months, stays at 3.0%. Monthly payment falls to ~£950 by end of year 2. 5-year total ~£60,500
Tracker wins by £4,900. Significant savings if rates fall meaningfully.
Scenario C: Base rate rises to 5.5% gradually, then stays
- 5-year fix at 4.3%: monthly payment unchanged; 5-year total £65,400
- Tracker: rate rises from 4.25% to 6.0% over 18 months. Monthly payment rises to ~£1,260. 5-year total ~£72,000
Fix wins by £6,600. Significant protection if rates rise meaningfully.
What the SWAP curve says today
The SWAP curve (the interest rate at which banks lend to each other for fixed periods) is the best market indicator of future rate expectations:
- 1-year SWAP: roughly 3.5% (markets expect cuts in the next year)
- 2-year SWAP: roughly 3.4%
- 5-year SWAP: roughly 3.5%
- 10-year SWAP: roughly 3.8%
The SWAP curve currently suggests:
- Base rate falling from 3.75% toward 3.0-3.25% over the next 12-18 months
- Stabilising around 3.0-3.5% for the medium term
- Long-run "neutral rate" around 3.5-4.0%
This is the market consensus. If you broadly agree with markets, trackers may slightly outperform fixes. If you think markets are too dovish (rates won't fall as much), fixes look better. If you think markets are too hawkish (rates will fall faster than expected), trackers win bigger.
Behavioural factors beyond pure economics
Payment certainty
Many UK mortgage holders prefer fixed payments for budgeting certainty — even if it costs slightly more in expected value. This is rational behaviour, not financial illiteracy. The cost of payment volatility is real for households on tight budgets.
Psychological "floor"
A tracker rate could in theory rise significantly. Even if you expect it to fall, the possibility of a 6%+ rate keeps some borrowers awake at night. Fix removes that worry.
Overpayment flexibility
Lifetime trackers usually have no ERC — you can overpay or repay anytime without penalty. Fixed-rate deals have ERC during the fix. For borrowers who might make large lump-sum overpayments (e.g. from bonuses, inheritance), the flexibility of trackers is valuable.
When fixing is the right answer
- You believe rates will rise or stay flat
- You value payment certainty for budgeting
- Your finances are tight; you can't absorb large rate increases
- You won't make material overpayments during the fix period
- You want to set-and-forget
When tracking is the right answer
- You believe rates will fall
- You can comfortably afford 1-2% higher payments if rates rise unexpectedly
- You want flexibility to overpay or repay early without ERC
- You're planning to remortgage / move within 2 years anyway
- You're financially sophisticated and willing to monitor rates
2-year fix vs 5-year fix
Among fixed-rate options, the 2-vs-5-year choice is its own decision:
2-year fix advantages
- If rates fall significantly, you can remortgage to a lower rate in 2 years
- If your circumstances change (job, family), less locked-in
- Sometimes slightly cheaper than 5-year fix in cut-expectations markets
5-year fix advantages
- Payment certainty for longer; budget peace of mind
- Avoid the remortgaging hassle and costs (mortgage fees, broker fees, possibly solicitor) every 2 years
- Lower SWAP-related rates often available for 5-year
- If rates rise unexpectedly during the 5 years, you're protected
For most retail in 2026/27 markets, a 5-year fix is the slightly-more-conservative default. Two-year fixes work if you have specific reasons to keep options open.
A practical decision framework
Step 1: Stress-test your cashflow at higher rates
Calculate your mortgage payment if rates rise to 6%, 7%, 8%. Is that affordable? If a 6% rate would cause significant household financial stress, fix. If 8% would be uncomfortable but manageable, tracker is fine.
Step 2: Consider your time horizon
If you're planning to move within 2-3 years, a 2-year tracker (often no ERC) avoids paying ERC on a fixed deal. If you're staying put 5+ years, a 5-year fix is usually the better deal.
Step 3: Form a view on rates
You don't need to be right; you just need to choose based on YOUR view. If you genuinely believe rates will fall, tracker. If you genuinely believe they'll rise, fix. If you have no view, the SWAP curve gives you the market consensus — pricing in cuts.
Step 4: Make the decision and stick with it
The worst outcome is choosing fix, watching rates fall, panicking, and switching to tracker just before the curve turns. Or vice versa. Whatever you choose, commit to it for at least the next 12 months.
Hybrid options
Discount mortgages
Variable rate at a discount to the lender's SVR for a defined period. Less common than pure trackers; usually inferior because SVR can rise independently of base rate.
Capped tracker
Tracker but with a maximum rate ceiling. You get the upside of falling rates and protection against severe rises. Rare in UK; usually priced expensively when available.
Part fix, part tracker
Some lenders allow splitting the mortgage: half on fix, half on tracker. Hedges both scenarios. Adds complexity; rarely better than picking one based on your view.
Frequently asked questions
Can I switch from tracker to fix mid-term?
If you're on a lifetime tracker, yes — you can remortgage at any time without ERC (the whole point of a lifetime tracker). If you're on a 2-year tracker, you'd typically pay ERC to exit early. Some lenders offer "drop-lock" features allowing you to switch to a fix during the tracker term without ERC.
What's the "reversion rate" and why does it matter?
The reversion rate is what your mortgage reverts to at the end of the fixed or tracker period — usually the lender's SVR (currently 7-8%). After the fix ends, you should remortgage to a new product, not let it sit on SVR. Setting a calendar reminder 6 months before fix-end is essential.
How much does a 0.5% rate difference cost?
On a £200k mortgage at 25-year term, 0.5% more rate adds ~£55/month or £660/year. Over 25 years, that's ~£16,500 extra interest. Small rate differences matter over long terms.
What's a "tracker with collar"?
An older tracker design where the rate couldn't fall below a defined floor (e.g. 4%) even if base rate fell below it. Mostly extinct in new products but some legacy mortgages still have collars. Check your specific product if you have an old tracker.
Should I take a 10-year fix?
Less common in UK retail. Pro: extreme payment certainty. Con: ERC for 10 years; you're locked in even if rates fall significantly. The right call for someone who definitely won't move and wants maximum certainty. For most retail, 5-year is the more flexible default.
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