A tracker mortgage is a variable-rate mortgage whose interest rate follows an external benchmark, usually the Bank of England base rate, plus a fixed margin set by your lender. Because the rate moves with the base rate, your monthly payments can go down but can also rise. This guide explains how tracker mortgages work, the types available, how they compare with fixed rates, and when a tracker may or may not suit you.
A tracker mortgage rate = Bank of England base rate + a fixed margin set by your lender. For example, if the base rate is 4% and your margin is 1%, you pay 5%. When the base rate changes, your rate and monthly payments change with it, so they can fall but can also rise. Unlike a lender's standard variable rate, the margin cannot be changed during the deal.
A tracker mortgage is a home loan where your interest rate is directly linked to an external benchmark, almost always the Bank of England base rate. Your rate is made up of that base rate plus a fixed margin set by your lender. Because the two move together, tracker rates are transparent and easy to follow.
Base rate tracker mortgage formula: Bank of England base rate + fixed margin = your rate
The Bank of England base rate is set by its Monetary Policy Committee and reflects wider economic conditions such as inflation. The margin is decided by your lender and stays fixed for the deal period. Lenders cannot change the margin part-way through, which is what makes a tracker more predictable than a standard variable rate.
A simple way to picture it: think of the base rate as a person walking, and your mortgage rate as their shadow. As the base rate moves up or down, your rate follows in step by the same amount. If the base rate rises by 0.25%, your tracker rate rises by 0.25% too, and your monthly payments increase. If it falls, your payments may reduce. The rate you are offered also depends on factors such as your loan to value and credit profile.
The key risk with a tracker is straightforward: because there is usually no upper limit, your payments can keep rising for as long as the base rate does. Budgeting for higher payments is essential.
The table below shows how the same tracker behaves at different base rate levels. It assumes a £200,000 repayment mortgage over 25 years with a fixed margin of 1.00%. The figures are illustrative only.
| Base rate | Margin | Your rate | Indicative monthly payment |
|---|---|---|---|
| 3.50% | +1.00% | 4.50% | around £1,112 |
| 4.00% | +1.00% | 5.00% | around £1,169 |
| 4.50% | +1.00% | 5.50% | around £1,228 |
Illustrative figures for a £200,000 repayment mortgage over 25 years. Your actual rate, payments and margin will depend on the lender, the product and your circumstances. Payments may rise if the base rate increases.
Two trackers that both follow the base rate can still cost very different amounts, because the margin is set by the lender. A smaller margin means a lower rate for the same base rate. When comparing trackers it is the margin, the product fees and any early repayment charges that distinguish one deal from another. You can model different scenarios using our mortgage calculators.
Enter your figures to see how your monthly payment could change if the Bank of England base rate moves. Illustrative only.
| If base rate | Your rate | Monthly payment | Change vs now |
|---|
Illustrative only. This is not a quote or mortgage advice. It assumes a capital repayment mortgage with interest applied monthly and the lender margin held constant. Your actual rate, payments and product terms depend on the lender and your circumstances. With a tracker, your payments may rise if the base rate rises.
Tracker mortgages broadly fall into two types, and the difference matters for both flexibility and risk.
| Feature | Term (introductory) tracker | Lifetime tracker |
|---|---|---|
| Tracks the base rate for | A set period, often 2 to 5 years | The entire mortgage term |
| After the deal period | Usually reverts to the lender's standard variable rate | Continues to track the base rate |
| Early repayment charges | Often apply during the deal period | Frequently none, allowing free overpayment or switching |
| Main attraction | Often a lower margin for the introductory period | Flexibility and long-term transparency |
| Main risk | Reverting to a higher SVR at the end | Carrying base rate risk for longer |
A lifetime tracker can be appealing if you value flexibility, for example the ability to overpay or move to a fixed rate without penalty, and the search term "lifetime tracker mortgage" is a popular one for exactly that reason. The trade-off is that you have no fixed period of payment certainty, so you are exposed to base rate movements for the whole term. A term tracker can offer a keener rate up front, but watch what happens when the introductory period ends. Mortgages with no early repayment charges are covered in more detail in our guide to flexible mortgages with no ERCs.
The right choice depends on how much payment certainty you need and your view on where tracker mortgage rates are heading.
| Feature | Tracker mortgage | Fixed rate mortgage |
|---|---|---|
| How the rate is set | Base rate plus a fixed margin | Set rate for the fixed period |
| Payment certainty | Payments can change at any time | Payments fixed for the term of the deal |
| If the base rate falls | Your payments may fall | Your payments stay the same |
| If the base rate rises | Your payments rise | Your payments stay the same until the deal ends |
| Early repayment charges | Often none on lifetime trackers | Usually apply during the fixed period |
| May suit | Borrowers who can absorb change and want flexibility | Borrowers who need budgeting certainty |
Neither option is universally better. A fixed rate buys certainty, which is valuable if your budget is tight or you simply prefer to know exactly what you will pay. A tracker offers the chance to benefit if rates fall and often more flexibility, at the cost of that certainty. If you are coming to the end of a deal, our guide on what to do when your fixed rate is ending walks through the options.
There is no single answer, because it depends on your circumstances and your attitude to risk. A tracker may suit you if you have enough room in your budget to absorb a rise in payments, you want to benefit if the base rate falls, or you value the flexibility of a lifetime tracker with no early repayment charges. It may not suit you if your budget leaves little margin for higher payments, or if the certainty of a fixed payment would give you greater peace of mind.
You have enough room in your budget to absorb a payment rise. You think the base rate is likely to fall or stay flat. You want a lifetime tracker with no early repayment charges so you can overpay, switch or sell without penalty. You are not on a tight monthly budget where a rate rise would cause real pressure.
Your budget is tight and a rate rise would create real difficulty. You have just bought at the top of your affordability and need certainty. You think the base rate may rise during your deal period. You value knowing exactly what the mortgage costs each month for the next 2, 3 or 5 years.
Because a tracker rate can rise with no upper limit on most products, consider how your payments would look if the base rate were noticeably higher than today, and whether you could comfortably afford that. Check whether the product has a collar (a floor) and whether early repayment charges apply if you later want to switch to a fixed rate. A whole-of-market broker can compare tracker and fixed options against your specific situation before you commit.
This is a decision where impartial advice is valuable, because the most suitable product depends on the detail of your finances rather than on rate alone.
Woodhall Mortgages is a whole-of-market, FCA-authorised mortgage broker (FRN 762513) based in Halifax, West Yorkshire. We compare tracker and fixed rate mortgages from across the full market and advise on which suits your circumstances. Broker fee: £299 on formal mortgage offer. Initial advice free.
Call 01422 354011 or use the form below. We compare tracker and fixed options across the market against your circumstances.
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As a whole-of-market mortgage broker, we compare tracker and fixed rate options from across the market and explain the risks and benefits of each against your circumstances.
Initial discussion free. A broker fee of £299 is payable on a successful mortgage offer if you choose to proceed. This fee is non-refundable once charged. With a tracker mortgage your payments may increase if interest rates rise. Your home may be repossessed if you do not keep up repayments on your mortgage.
Speak to a Mortgage AdviserGeneral information: This article is for general guidance only and does not constitute regulated mortgage advice. A tracker mortgage is a variable-rate product, and your monthly payments may rise as well as fall as the Bank of England base rate changes. Always verify current rates and product terms with your adviser before making financial decisions.
Regulatory status: Woodhall Mortgages is authorised and regulated by the Financial Conduct Authority. Firm reference number 762513. Woodhall Mortgages is a whole-of-market mortgage broker. We consider a comprehensive range of mortgages from across the market, but not all lenders or products may be included.
Your home may be repossessed if you do not keep up repayments on your mortgage.
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