Variable-Rate Mortgages
A variable-rate mortgage is any mortgage where your interest rate can change during the term – an umbrella category covering three genuinely distinct products, each moving for different reasons and worth understanding separately before choosing between them.
What “Variable Rate” Actually Covers
Variable rate is a broad category, not a single product, and it’s worth understanding the three main types fall under it: tracker mortgages, discount mortgages, and Standard Variable Rate mortgages. Each moves in a genuinely different way, and confusing one for another is a common source of misunderstanding when comparing deals.
Tracker Mortgages: Following an External Benchmark
A tracker mortgage follows the Bank of England base rate plus a fixed margin, moving automatically whenever the base rate changes. Our Tracker Mortgages page covers this specific product in full detail, including worked examples and how lenders stress-test affordability for it.
Discount Mortgages: A Genuinely Different Mechanism
A discount mortgage offers a fixed reduction below your lender’s own Standard Variable Rate, for an agreed period, commonly 2-5 years. This sounds similar to a tracker, but the mechanism is genuinely different – rather than following an external, publicly available benchmark like the base rate, a discount mortgage moves in line with your lender’s own SVR, which they set entirely at their own discretion.
Why This Distinction Matters
Because a discount mortgage tracks the lender’s own internal rate rather than an external benchmark, it can genuinely move even when the Bank of England base rate doesn’t change at all. If a lender decides to raise or lower their SVR for reasons unrelated to the base rate, your discount mortgage payment moves with it, making this a somewhat less predictable structure than a tracker.
Worked Example
If your lender’s SVR is 6% and you have a 1.5% discount, you’d pay 4.5%. If that lender then raised their SVR to 6.5%, your rate would rise to 5%, even if the Bank of England base rate hadn’t moved at all during that time.
Why a Bigger Discount Doesn’t Always Mean a Lower Rate
It’s worth comparing the actual resulting rate, not just the size of the discount, when weighing up different lenders’ offers. A larger discount off a higher SVR can still work out more expensive than a smaller discount off a lower SVR – the discount percentage alone tells you very little without knowing what it’s actually being applied to.
Fees and Flexibility on Discount Deals
Discount mortgages sometimes carry lower Early Repayment Charges than fixed-rate deals, or occasionally none at all, since the lender isn’t breaking an external financial contract to let you leave early in the way they would with a fixed-rate product. Some discount deals also include a collar – a floor below which your rate won’t fall even if the SVR drops further – worth checking before assuming unlimited downside benefit.
Standard Variable Rate (SVR): The Default You Land On
Every UK lender has a Standard Variable Rate – their own default interest rate, which is what your mortgage moves onto automatically once any fixed, tracker, or discount deal ends, unless you actively arrange a new product beforehand.
Why SVR Is Genuinely Unpredictable
Unlike a tracker, which is contractually bound to move with the base rate, a lender’s SVR isn’t tied to anything in particular. It’s influenced by the base rate and broader market conditions, but the lender retains complete discretion over when and by how much it changes – they could hold it steady after a base rate cut, or raise it independently of any base rate movement at all.
Why SVR Is Almost Always More Expensive
Recent market comparisons have shown average SVRs sitting notably higher than average fixed rates – commonly several percentage points above competitive two or five-year fixed deals. Given roughly 1.8 million UK fixed-rate mortgages are due to expire during 2026 alone, understanding this gap matters for a genuinely large number of homeowners right now.
Why Some Borrowers End Up on SVR Without Choosing To
Most people don’t deliberately select an SVR – they end up on it because their previous deal expired and they didn’t arrange a replacement in time, or because their circumstances have changed since their original mortgage, making it harder to pass a new lender’s affordability checks. If your income, credit profile, or property value has shifted since you took out your current deal, it’s worth discussing this with your broker well before your fix or tracker period ends, rather than discovering the issue at the last minute.
The Genuine Upside of SVR
SVR isn’t without its advantages – there’s typically no Early Repayment Charge at all, meaning you can leave whenever you like, and usually no restriction on how much you can overpay. For borrowers planning to sell or remortgage imminently, this flexibility can genuinely outweigh the higher rate for a short period, though it’s rarely the right choice as a long-term strategy.
Fixed as the Alternative to All Three
If none of these variable structures appeal, given the genuine uncertainty each carries in a different way, our Fixed-Rate Mortgages page covers the alternative – a locked-in rate for a set period, currently the choice for around 85% of UK mortgage holders, trading the possibility of a lower rate for complete payment certainty.
Choosing Between the Three Variable Types
A tracker suits those who want transparency and a genuine external benchmark to follow. A discount can offer a lower starting rate but with less predictable future movement, since it depends on your specific lender’s internal decisions. SVR is rarely chosen deliberately, but understanding it matters for everyone, since it’s where every mortgage eventually lands without active management.
Frequently Asked Questions
What’s the difference between a tracker and a discount mortgage?
A tracker follows the external Bank of England base rate plus a margin; a discount mortgage follows your lender’s own internal Standard Variable Rate minus a set discount, which can move independently of the base rate.
Why might my discount mortgage rate change even if the base rate doesn’t move?
Because it’s tied to your lender’s own SVR, which they can adjust at their own discretion for reasons unrelated to the Bank of England base rate.
What is a Standard Variable Rate and why does it matter?
It’s the default rate every mortgage moves onto once a fixed, tracker, or discount deal ends without a new arrangement – typically considerably more expensive than a competitive deal.
Does a bigger discount always mean a lower rate?
No – it depends on what SVR the discount is being applied to; it’s worth comparing the actual resulting rate across lenders, not just the discount percentage.
Are there any genuine advantages to being on an SVR?
Yes – typically no Early Repayment Charge and no overpayment restrictions, which can suit short-term flexibility, though it’s rarely the right long-term choice given the higher rate.
Get in touch with details of your circumstances, and we’ll help you understand which rate structure, variable or fixed, genuinely suits your situation.
