Tracker Mortgages Explained: How They Work and When One Beats a Fix
Written by Jake Stott, Knox Mortgages. Published 12 August 2026. Last reviewed 12 August 2026.
A tracker mortgage is a variable rate mortgage whose interest rate follows the Bank of England base rate plus a fixed margin set by the lender. If the base rate moves, your rate moves with it, usually from the following month. The margin never changes during the deal period.
That mechanism matters more than usual right now. The base rate has been held at 3.75% since December 2025, but three of the nine Monetary Policy Committee members voted to raise it in July 2026. Trackers are currently priced below fixed rates, which is unusual and worth understanding before you take one.
How does a tracker mortgage work?
Your rate is expressed as base rate plus a margin. A product advertised at “base plus 0.24%” charges 3.99% while the base rate sits at 3.75%. If the Bank of England raises the base rate to 4%, your rate becomes 4.24% and your monthly payment rises. If it cuts to 3.5%, your rate falls to 3.74%.
Most trackers run for two, three or five years, then revert to the lender’s standard variable rate. A smaller number are lifetime trackers, which follow the base rate for the whole mortgage term with no reversion.
The lender cannot change the margin during the deal. That is the key difference between a tracker and a discount or standard variable rate, both of which can be repriced at the lender’s discretion. A tracker only moves when the Bank of England moves.
What is the Bank of England base rate in August 2026?
The Bank of England base rate is 3.75%. The Monetary Policy Committee held it there on 30 July 2026, the fifth consecutive hold, on a 6 to 3 vote. The three dissenters, Huw Pill, Megan Greene and Catherine Mann, voted to raise it to 4% on concern that higher energy prices are feeding into more persistent inflation.
Three decisions remain in 2026: 17 September, 5 November and 17 December. Market expectation ahead of September is another hold.
The direction of travel matters for anyone considering a tracker. This is not a market pricing in a run of cuts, and a third of the committee is arguing for the opposite. Test any tracker decision against a rise, not a fall.
Are tracker mortgages cheaper than fixed rates right now?
Yes, on headline rate. As of 12 August 2026, the leading two year tracker is priced below the leading two year fix, which reverses the usual pattern.
| Deal type | Leading rate (60% LTV) | Lender | Product fee |
|---|---|---|---|
| 2 year tracker | 3.99% (base plus 0.24%) | Barclays | £1,104 |
| 2 year fixed | 4.32% | Danske Bank | £1,124 |
| 5 year fixed | 4.48% | Barclays | £1,004 |
| 2 year tracker, no fee | 4.74% | Nationwide | £0 |
Market averages sit well above those best buys. Moneyfacts put the average two year fix at 5.63%, the average five year fix at 5.67% and the average standard variable rate at 7.13% in mid August 2026. Rates quoted at 60% loan to value are the sharpest available; higher bands price above them, so check how much deposit you need before assuming you qualify.
What would a base rate rise actually cost you?
This is the part almost every bank page skips. Here is the arithmetic on a £250,000 repayment mortgage over 25 years, on a tracker priced at base plus 0.24%.
| Base rate | Your tracker rate | Monthly payment | Change vs today |
|---|---|---|---|
| 3.25% | 3.49% | £1,250 | £68 lower |
| 3.50% | 3.74% | £1,284 | £34 lower |
| 3.75% (today) | 3.99% | £1,318 | Baseline |
| 4.00% | 4.24% | £1,353 | £35 higher |
| 4.25% | 4.49% | £1,388 | £70 higher |
| 4.50% | 4.74% | £1,424 | £106 higher |
The same borrower on the leading 4.32% two year fix pays £1,364 a month. So the tracker starts £46 a month cheaper. Hold the base rate flat for two years and the tracker saves £1,103 in total. One 0.25 point rise cuts that advantage to £11 a month. A second rise puts you £24 a month worse off than the fix, and you stay there for as long as the rate holds.
That is the honest summary: a tracker at these margins survives one rate rise and loses to a fix on the second.
When does a tracker actually beat a fixed rate?
A tracker is the stronger choice in four situations, and a weak choice outside them.
- You expect to repay or move soon. Many trackers carry no early repayment charge. If you are selling within 18 months or waiting on a probate sale, that flexibility is worth more than the rate.
- You have genuine headroom in your budget. If a £100 a month rise is an inconvenience rather than a problem, you can afford the risk. If it is not, do not take it.
- You are between deals. A tracker with no early repayment charge is a useful holding position while a purchase completes or you wait for fixes to reprice.
- You are overpaying aggressively. No penalty means lump sums without hitting a 10% annual cap.
If none of those apply and you simply want the lowest payment today, you are being paid roughly 0.33 percentage points to take on unlimited upside risk. That is a thin premium when three of nine committee members are voting to raise. Our view on whether to fix your mortgage covers the trade off in more detail.
Do tracker mortgages have early repayment charges?
Some do and some do not, and the difference is worth real money. Fixed period trackers commonly carry an early repayment charge of 1% to 3% of the balance, tapering by year, if you repay or switch before the deal ends. Lifetime trackers usually carry none at all.
On a £250,000 balance, a 2% early repayment charge is £5,000. That is not a rounding error, and it can wipe out the saving that made the tracker attractive in the first place.
Check three things before you sign: the charge percentage in each year, the annual penalty free overpayment allowance, and whether the product is portable if you move house. A tracker with no early repayment charge at a slightly higher rate is often the better product, because that flexibility is the whole point of taking a variable rate.
How do lenders stress test a tracker mortgage?
Harder than they stress test a five year fix, and it affects how much you can borrow. Under FCA rule MCOB 11.6.18R, lenders must assess affordability against likely future interest rate rises for a minimum of five years, applying a stress margin of at least 1% and taking the reversion rate into account.
A five year fixed rate is exempt from that forward stress for its fixed period, because the payment cannot move. A two year tracker is not. The lender must test you against a materially higher rate, so the same income can support a smaller loan on a tracker than on a longer fix.
This catches people out at application stage. If you are borrowing near your maximum, the tracker may not stretch far enough. Read how lenders calculate affordability and check how much you can borrow before settling on a product type.
Tracker vs fixed vs standard variable rate
| Tracker | Fixed rate | Standard variable rate | |
|---|---|---|---|
| Rate set by | Bank of England base rate plus fixed margin | Locked for the deal term | Lender discretion |
| Payment certainty | None | Full for the term | None |
| Can it fall? | Yes, unless a collar applies | No | Rarely in full |
| Typical August 2026 rate | 3.99% to 4.74% | 4.32% to 5.63% | 7.13% average |
| Early repayment charge | Sometimes, often none on lifetime deals | Almost always | Never |
| Best for | Flexibility and short horizons | Budget certainty | Nobody, deliberately |
The standard variable rate column is the one to watch. At an average of 7.13% it is where you land by default when any deal ends, costing a £250,000 borrower around £1,788 a month against £1,318 on the leading tracker. Sorting a remortgage or product transfer before expiry is the highest value move most borrowers can make. See what happens when your fixed rate ends for the timeline.
Frequently asked questions
What is a collar rate on a tracker mortgage?
A collar is a floor below which your tracker rate cannot fall, regardless of how low the base rate goes. If your product has a 2% collar and the base rate drops to 0.1%, you still pay 2%. Collars are less common than they were, but they are still written into some product terms, so check the key facts illustration rather than the advertised rate.
Can I switch from a tracker to a fixed rate?
Yes. If your tracker has no early repayment charge you can switch at any time without penalty. If it does, you either pay the charge or wait until the deal period ends. Some lenders also offer a switch to fix facility that lets you move onto one of their own fixed products mid deal without a charge, though you are then limited to that lender’s range.
How quickly does my payment change after a base rate decision?
Usually from the first of the following month, though the exact timing is set out in your mortgage offer. Lenders must write to you before the change takes effect. A 0.25 point rise on a £250,000 mortgage over 25 years adds roughly £35 a month.
Are tracker mortgages available for buy to let?
Yes, and they are common in the buy to let market, particularly for landlords planning to refinance or sell within a short window. The interest cover ratio calculation is stress tested in the same way, so a tracker can reduce the maximum loan available against a given rental income compared with a five year fix.
Can self-employed applicants get a tracker mortgage?
Yes. Product type and employment status are assessed separately. The tracker range available to a sole trader or a limited company director is the same as for an employed applicant, provided the income evidence satisfies the lender. The tighter stress test on short term variable products is the real constraint, not the self-employment.
Is a lifetime tracker a good idea?
It depends entirely on flexibility. A lifetime tracker with no early repayment charge lets you overpay without limit and leave whenever you want, which suits people expecting a lump sum or an early sale. The cost is permanent exposure to base rate movements with no end date, so it is a poor fit for anyone who needs a predictable monthly payment.
What happens when my tracker deal ends?
You move onto the lender’s standard variable rate, which averaged 7.13% in August 2026. That is typically a jump of two to three percentage points. Start looking at your options around six months before the deal ends, because most offers can be reserved in advance and honoured on completion.
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