Fixed vs tracker vs variable mortgages — the UK trade-offs

There are three main UK mortgage shapes: fixed-rate, tracker, and standard variable rate. Knowing what each one actually does — and how they react to Bank of England base rate moves — is the difference between feeling comfortable when rates move and being surprised by the next payment.

This is an editorial walk-through, not a recommendation. Mortgages are regulated by the FCA; for product selection, a regulated mortgage adviser is the right call.

Fixed-rate mortgages — the predictability product

A fixed-rate mortgage locks your interest rate for a set period — usually 2, 5, or 10 years. Your monthly payment doesn’t change during that term, regardless of what the Bank of England base rate does.

Mechanics:

• The lender prices the fix based on gilt yields at the maturity matching your fix term, plus a margin for risk and costs.
• After the fix ends, you revert to the lender’s standard variable rate (SVR) — unless you remortgage or take a product transfer first.
• Most fixes come with early repayment charges (ERCs): leaving early during the fixed period typically costs 1–5% of the outstanding balance. The percentage usually steps down each year (e.g. 5% in year 1, 4% in year 2, etc.).

The trade-offs:

• You pay for the certainty. Lenders price into the fix the option-value of locking you into the rate. In a falling-rate environment, the fixed-rate borrower misses some of the fall; in a rising-rate environment, the fixed-rate borrower benefits.
• 5-year vs 2-year fixes price differently. 5-year fixes are sometimes cheaper than 2-year (when markets expect rates to fall) and sometimes more expensive (when markets expect them to rise). The gap moves daily.
• Overpayments are usually capped at 10% per year. Above that, ERCs apply.

Suits: borrowers who value payment certainty, those at the edge of affordability, those near the start of the mortgage term where small payment shocks have time to compound, and anyone who’d rather avoid checking BoE announcements every six weeks.

Watch outs: leaving early can be expensive. If there’s any chance of moving, downsizing, or coming into a lump sum to overpay aggressively, the ERC schedule matters. Some “portable” fixes let you transfer the product to a new property — useful but not always allowed for higher-value moves.

Tracker mortgages — the BoE follower

A tracker mortgage’s rate is the Bank of England base rate plus a margin. If the base rate is 4.25% and the tracker margin is 0.75%, your rate is 5.00%. If the BoE cuts to 4.00%, your rate falls to 4.75% — usually within a month or two.

Mechanics:

• Trackers typically have a 2 or 5-year term, after which you revert to the SVR.
• Some trackers have a collar (the rate can’t fall below a set floor) and a cap (it can’t rise above a set ceiling). Most don’t.
• ERCs vary widely — some trackers have none (lifetime trackers in particular).

The trade-offs:

• You take the rate risk. If the BoE raises base rate by 1%, your monthly payment rises directly.
• You also take the rate benefit. If the BoE cuts, your payment falls without any action from you.
• Trackers often have no ERC. That makes them attractive for borrowers who think they might overpay aggressively, move, or remortgage when better deals appear.

Suits: borrowers comfortable with payment variability, those who think rates may fall faster than markets are currently pricing, and anyone needing flexibility — to overpay, to move, or to switch when a better deal comes along.

Watch outs: lifetime trackers (where the margin over base is locked for the full mortgage term, often at +0.5% to +1.0%) are sometimes available with no ERC at all. They can be excellent products if you can stomach the variability — but they’re less common than they used to be.

Standard Variable Rate (SVR) — the default

When a fix or tracker ends, the lender places you onto their standard variable rate unless you remortgage. The SVR is set entirely by the lender — there’s no published formula tying it to the base rate.

In practice:

• Most lenders move the SVR up when base rate rises and down when base rate falls, but with a lag and not always by the full amount.
• The SVR is typically the most expensive rate the lender offers. Sitting on it is rarely the cheapest option.
• There are no ERCs on the SVR — you can leave any time.

Suits: short-term flexibility — for instance, in the months between fixes while you arrange a remortgage. Almost no one chooses the SVR as their long-term home.

Watch outs: lenders sometimes let SVR borrowers drift for years without realising they’re paying 2–4 percentage points more than they could be. Reviewing every two years at minimum — and ideally setting a calendar reminder when a fix ends — is the cheapest hour of mortgage admin per year.

Discount-rate and capped products — the variants

A few less common products worth knowing:

• Discount mortgages apply a fixed discount (e.g. SVR − 1.5%) for a set term. They move with the SVR — so they’re tracker-like, but tracking a lender-set rate rather than the BoE base.
• Capped trackers are trackers with a ceiling — the rate can’t exceed a stated maximum during the term. The cost is a small premium over an uncapped tracker.
• Offset mortgages link your savings to your mortgage; the savings reduce the balance on which interest is calculated. Tax-efficient for higher-rate taxpayers with substantial savings; see our offset guide (coming soon).

How rates have moved (and why it matters)

UK mortgage rates were unusually low between 2009 and 2021 — base rate stayed below 1% for most of that period. The 2022–2024 rate-rising cycle pushed mortgage rates to levels not seen since the 2008 crisis. As of 2026/27, with base rate having begun to fall, fixed-deal pricing has moderated but not returned to the 2021 lows.

The lesson most planners draw: don’t assume the rate environment of the past decade is the new normal. The 2-year fix at 1.5% from 2021 was an unusual product of unusually accommodative central bank policy, and rebuilding the assumption that mortgages are routinely cheap may be unwise.

The choice, in summary

Three rough rules of thumb:

• If certainty is what you need, fix. Especially if you’re early in a mortgage term or at the edge of affordability.
• If you might move, overpay aggressively, or are comfortable with variability, tracker. Particularly if it has no ERC.
• If you’ve drifted onto the SVR, plan your remortgage now. It’s almost always more expensive than the next-cheapest option.

Use our mortgage affordability calculator to model the stress-tested monthly payment at various rates. Pair with the FTB route map if you’re buying for the first time.

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Last updated 22 May 2026. This guide is educational and is not personal financial advice. Mortgages are regulated by the FCA — speak to a regulated adviser before applying. See our disclaimer.