Variable-Rate Mortgages Explained (2026): SVR, Trackers & Discounts
A variable-rate mortgage is any mortgage where the interest rate — and your monthly payment — can change. Here’s how the three main types work (standard variable, tracker and discount), when a variable deal makes sense, and how to escape the most expensive one of all: the SVR.
Quick Answer
A variable-rate mortgage is any mortgage whose interest rate can go up or down, so your monthly payment isn’t fixed. There are three main kinds: the standard variable rate (SVR), set at the lender’s discretion; a tracker, which follows the Bank of England base rate; and a discount, which is the lender’s SVR minus a set amount for an introductory period.
Variable deals can be cheaper than fixing when rates fall, and often allow penalty-free overpayments — but your payment can rise without much warning. The one to avoid sitting on is the SVR, which is usually the priciest rate a lender offers. Your home may be repossessed if you do not keep up repayments on your mortgage.
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What Is a Variable-Rate Mortgage?
A variable-rate mortgage is any mortgage where the interest rate isn’t locked — it can change during your deal, and when it does, your monthly payment changes with it. It’s the opposite of a fixed-rate mortgage, where the rate is guaranteed for a set period.
“Variable” is an umbrella term, and that’s where people get confused. It covers three distinct products that move in very different ways:
- Standard variable rate (SVR) — the lender’s default rate, which they can change whenever they choose.
- Tracker — pegged to the Bank of England base rate at a fixed margin, so it moves only when the base rate moves.
- Discount — the lender’s SVR reduced by a set amount for an introductory period.
The differences matter enormously, because one of them (the SVR) is usually the most expensive rate on offer, while the others can be genuinely competitive. Let’s take them in turn.
The Standard Variable Rate (SVR)
The standard variable rate is a lender’s default rate — the rate you roll onto automatically when a fixed, tracker or discount deal ends. Its defining feature: the lender sets it, and can change it at their discretion. It usually moves roughly in line with the Bank of England base rate, but the lender isn’t obliged to pass on cuts in full, or at all, and can raise it even when the base rate hasn’t moved.
Because it’s not designed to be competitive, the SVR is typically well above the deals available on the open market — it’s the rate you land on, not one you’d usually choose.
Sitting on the SVR? You’re probably overpaying
Most people end up on the SVR by accident — a fixed deal ended and they did nothing. The SVR usually costs significantly more than a fresh deal would, every single month. The good news: SVRs almost never carry early repayment charges, so you can leave at any time. If you’re on your lender’s SVR now, remortgaging is usually the fastest way to stop overpaying.
Tracker Mortgages
A tracker is a variable rate that follows the Bank of England base rate at a fixed margin — say, base rate + 0.75%. When the base rate moves, your rate moves by exactly the same amount, no more and no less. That transparency is the key difference from the SVR: there’s no lender discretion, just a formula.
Trackers often launch cheaper than fixes when markets expect rates to fall, and many carry no early repayment charges. They’re a big enough topic to have their own guide — see tracker mortgages explained for how base-rate tracking, collars and lifetime trackers work in full.
Discount Mortgages
A discount mortgage charges the lender’s SVR minus a fixed discount for an introductory period — for example, “SVR minus 1.5% for two years.” The headline rate can look attractive, but there’s a catch worth understanding:
The discount-mortgage catch
Because a discount tracks the SVR, and the lender controls the SVR, your rate can rise whenever the lender lifts their SVR — even if the Bank of England base rate hasn’t moved. So a discount gives you less certainty than a tracker: you’re still exposed to the lender’s discretion, just at a reduced level. Always check the SVR it’s discounting from, not just the size of the discount.
When the discount period ends, you roll onto the full SVR — so, like any introductory deal, a discount is something to remortgage away from before it reverts.
Variable vs Fixed: Which Should You Choose?
Variable
You benefit if rates fall, deals can start cheaper than fixes, and many variable products (especially trackers) allow penalty-free overpayments or exit. The cost: your payment can rise, making budgeting less predictable — and on an SVR or discount, partly at the lender’s discretion.
Fixed
Your payment is locked for the deal — certainty and protection from rises — but you won’t benefit if rates fall, and leaving early usually triggers an early repayment charge. Our fixed-rate guide covers how long to fix for.
The honest framing: choosing variable over fixed is taking a view that rates will fall or hold — and the deciding question isn’t “which is cheaper?” (unknowable in advance) but “could I absorb a payment rise if I’m wrong?” If a jump of a couple of hundred pounds a month would strain you, the certainty of a fix is worth its price. If you have headroom and value flexibility, a variable deal has a real case. A broker can model both against today’s actual numbers — including how much you’d save by leaving an SVR right now.
Should You Get a Variable-Rate Mortgage?
A variable deal (a tracker or discount — not sitting on the SVR by default) tends to suit you when:
- You think rates will fall or hold over your deal period — the core bet.
- You have payment headroom — you could absorb a higher payment without hardship. If not, fix.
- You value flexibility — many variable deals let you overpay or leave without penalty, useful if you expect a windfall, a move, or a switch to a fix later.
- You’re bridging — some people take a short variable deal while waiting for fixed rates to improve, then remortgage onto a fix.
It suits you poorly if a rising payment would genuinely stretch your budget, or you need the certainty to plan — in which case a fix is the safer home. And whoever you are, the one variable rate nobody should choose deliberately is the SVR. Landlords weigh the same trade-off: variable buy-to-let deals exist with identical mechanics. As with any deal, what you can borrow depends on affordability, not the rate type.
The bottom line
“Variable rate” isn’t one thing — it’s three. A tracker moves transparently with the base rate; a discount shadows the lender’s SVR at a reduction; and the SVR itself is the expensive default you roll onto and should rarely stay on. Chosen deliberately, with headroom and a view on rates, a variable deal can beat fixing. Landed on by accident, the SVR quietly costs you every month.
Compare mortgage deals and we’ll match you with an FCA-regulated broker who can compare variable and fixed options — and rescue you from an SVR — free, with no obligation.
Frequently Asked Questions
What is a variable-rate mortgage?
It’s any mortgage whose interest rate can change during the deal, so your monthly payment can go up or down — the opposite of a fixed rate. “Variable” covers three main types: the standard variable rate (set by the lender), a tracker (which follows the Bank of England base rate), and a discount (the lender’s SVR minus a set amount). They move in quite different ways, which is why the distinction matters.
How does a variable-rate mortgage work?
Your rate can change, and when it does your monthly payment changes with it. Exactly what drives the change depends on the type: a tracker moves only when the Bank of England base rate moves, by the same amount; an SVR moves at the lender’s discretion, loosely following the base rate; and a discount follows the lender’s SVR at a fixed reduction. Trackers are the most transparent; the SVR gives the lender the most control.
What is a standard variable rate (SVR)?
The SVR is a lender’s default interest rate — the one you automatically roll onto when a fixed, tracker or discount deal ends. The lender sets it and can change it at their discretion, and it’s usually well above the deals available on the open market. It rarely carries early repayment charges, so you can leave it at any time, which is why remortgaging off the SVR usually saves money.
Is a variable rate better than a fixed rate?
Neither is universally better. A variable rate can be cheaper if rates fall and often allows penalty-free flexibility, but your payment can rise. A fix locks your payment for certainty but won’t benefit from falling rates and usually charges you to leave early. The practical test: if a meaningful payment rise would strain your budget, fix; if you have headroom and expect rates to fall or hold, a variable deal has a real case.
What’s the difference between a tracker and a variable rate?
A tracker is a type of variable rate, but a specific and transparent one: it follows the Bank of England base rate at a fixed margin and moves only when the base rate moves. A standard variable rate (SVR) is also variable, but the lender sets it at their discretion and can change it even when the base rate hasn’t. So all trackers are variable, but not all variable rates track the base rate — the SVR doesn’t.
Can I switch from a variable rate to a fixed rate?
Usually yes, and often easily. If you’re on an SVR there’s normally no early repayment charge, so you can remortgage or take a product transfer onto a fix whenever you like. On a tracker or discount deal, check whether an early repayment charge applies during the intro period. Many people move from variable to fixed precisely when they want to lock in certainty — a broker can time and arrange the switch.
- Bank of England — Bank Rate and how it affects mortgage rates
- MoneyHelper — guidance on variable-rate, tracker, discount and standard variable rate mortgages
- Financial Conduct Authority (FCA) — Mortgages and Home Finance: Conduct of Business (MCOB) rules
Important information
nextmove is an introducer, not a lender or adviser. This article is for general information only and does not constitute financial advice. We introduce you to FCA-regulated mortgage brokers who can advise on your individual circumstances, and we may receive a fee or commission for doing so.
Your home may be repossessed if you do not keep up repayments on your mortgage. Rates, margins, standard variable rates and lender criteria change over time — always confirm current terms with a regulated adviser before proceeding.
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