How Exposed Are You to the Base Rate?

This article is general information, not financial advice. The examples are arithmetic on stated, illustrative figures; your own terms will differ.

Bank Rate is 3.75%. It has been since 18 December 2025, and the Bank of England held it on 17 September 2026. The next announcement is on 5 November 2026 (Bank of England, checked 22/10/2026). Your exposure is not the rate. It is which of your products reprice with it, and how many months until they do. Fixed products are not exempt: their exposure is deferred, not absent.

How Far It Swings

Bank Rate was cut to 0.25% on 11 March 2020 and to 0.10% on 19 March 2020. It stayed at 0.10% until the first rise, to 0.25%, on 16 December 2021. Fourteen consecutive rises then took it to 5.25% on 3 August 2023, 19 months later. Six cuts since 1 August 2024 have taken it to 3.75%. The earlier peak in this chart is 5.75% on 5 July 2007, and the fall to 0.50% by 5 March 2009 took twenty months.

Translate that into a payment. Take a £200,000 tracker with 25 years left, at Bank Rate plus a 1.00% margin (illustrative). At the 0.10% low the rate is 1.10% and the payment £762.83 a month. At today's 3.75% it is 4.75% and £1,140.23. At the 5.25% peak it is 6.25% and £1,319.34. The same loan cost £556.51 a month more at the peak than at the low, and £179.11 a month more than it does now.

Trackers: The Fastest Exposure

A tracker pays Bank Rate plus a fixed margin, so the rate moves when Bank Rate does and your payment follows. A lifetime tracker does this for the whole term. A tracker for a fixed period does it until the deal ends, then typically moves to the lender's standard variable rate. Some trackers have a floor, a rate below which yours cannot fall, so a cut stops helping at that level. Your offer document states the margin, the floor and any cap.

Drag the Bank Rate

Move the slider to see what each holder below would pay or earn at a different Bank Rate. The marks are 0.10% (March 2020), today and 5.25% (August 2023). The student loan row uses the lower-of rule and RPI of 4.1% (GOV.UK, checked 22/10/2026); every other figure is rate-plus-margin arithmetic on the balances you can edit.

Standard Variable Rate and Discounts

A standard variable rate (SVR) is set by the lender. It usually moves with Bank Rate but nothing obliges it to, or to move by the same amount. A discount mortgage pays the SVR minus a fixed discount. Illustration: SVR 7.00% less a 1.00% discount is 6.00%, £1,288.60 a month on the £200,000 example. If Bank Rate falls 0.25 points and the lender cuts its SVR by only 0.15, you pay 5.85%, £1,270.33. If it cuts nothing, nothing changes. The lag is the lender's to decide.

Fixed Rates: Exposure Deferred, Not Absent

A fixed mortgage ignores Bank Rate for the length of the fix and then reprices at whatever the market asks. Today's Bank Rate does not set that new rate, but market expectations of it do, so what matters is the date. A fix ending in six months is almost as exposed as a tracker. One ending in four years is a problem for later, and later is when you can plan for it.

Example: £200,000 on a 25-year repayment mortgage fixed at 2.00%, paying £847.71. The balance when the fix ends depends on how far away that is: £196,901 after 6 months, £193,771 after 12, £187,415 after 24. Take the 24-month case, with 23 years remaining, and a new rate of:

• 3.50%: £989.57 a month, £141.86 more.
• 4.50%: £1,091.17 a month, £243.46 more.
• 5.50%: £1,198.12 a month, £350.41 more.

These new rates are labelled guesses, not predictions. The point is the spread: a 2-point range of new rates is a £208.55 range in the monthly payment. Fixed savings work the same way. A £20,000 bond at 4.50% pays £900 a year until it matures; rolled into a 3.25% bond it pays £650 (illustrative, before tax). Fixed-rate loans refinanced at the end of their term behave like the mortgage: the old rate holds until the date, and the new rate is the market's.

Leaving a fix early usually triggers an early repayment charge, so the practical choice is to let it end and have the next deal lined up. Your key facts illustration states the charge and the end date.

Offset Mortgages

An offset mortgage is a tracker or a fix with your savings netted against the balance, so it carries the exposure of its underlying rate. What changes is the value of the netting. £20,000 in an offset against a £200,000 balance at 4.75% avoids about £950 of interest a year (£20,000 times 4.75%). At 3.75% it avoids about £750. When the rate falls, the cash you hold there is worth less to you, which is the same direction as a savings account.

Savings and Cash ISAs

Easy-access and variable ISA rates are set by the provider, who can change them. They tend to follow Bank Rate, but the pass-through and the delay are the provider's choice. Example: £20,000 at 3.25% earns £650 a year. If a one-point cut is passed on in full, it earns £450 (illustrative, before tax), and if the provider passes on less, less is lost. For a saver the direction reverses: cuts hurt, rises help.

The upcoming ISA rule changes are covered in the cash ISA cut and the Lifetime ISA replacement.

Credit Cards, Overdrafts and Loans

A credit card's APR is set in your agreement by the lender, not by a Bank Rate formula, so a Bank Rate move does not reprice it by arithmetic. The date to watch on a card is the end of a 0% deal, when the rate reverts to the standard one. Overdrafts and personal loans: check whether the agreement says the rate is variable and who decides when it changes. A variable loan rate is the lender's decision, like an SVR. A fixed loan rate holds until the loan ends.

Student Loans

Only some plans touch Bank Rate. Plan 1 and Plan 4 are charged the lower of RPI and Bank Rate plus 1%, which today is RPI, 4.1%. Bank Rate plus 1% is 4.75%, so a cut changes nothing until Bank Rate falls below 3.10%. Plan 2, Plan 5 and the Postgraduate Loan follow RPI and have no Bank Rate leg: Plan 5 is 4.1% and the Postgraduate Loan 6% (GOV.UK, checked 22/10/2026). Plan 2 depends on income, from 4.1% up to 6%. The full rules, and when Bank Rate has mattered, are in Does Bank Rate Affect Your Student Loan?.

Your Exposure Checklist

No score, because the weights depend on your balances. Count the yes answers, then look at the first two, which are the ones with a payment attached.

• Do you have a tracker or lender-controlled variable mortgage? Yes means exposure now.
• When does each fix end? Write the date for every mortgage, loan and fixed savings bond. Under 12 months is near, over three years is far.
• Is any of your monthly cash relying on a variable savings rate?
• Do you hold a Plan 1 or Plan 4 loan with Bank Rate plus 1% close to RPI?
• Does a 0% card deal or a discount end within a year?
• Could you absorb the payment at 2 points higher on your biggest rate-linked debt? If not, that is the number to plan around.

Edge Cases That Change the Answer

• The lag. A Monetary Policy Committee decision takes effect for the Bank on the day. When your payment changes depends on the lender and your payment date, and can be weeks.
• Payment or term. At a reset some lenders recalculate the payment, others keep it and let the term flex. Your lender's terms say which.
• Floors and caps. A floor stops a tracker falling below a set rate. Check whether yours has one, and a cap.
• Early repayment charges. They usually apply to fixes and some trackers, so a better deal may cost more to reach than it saves.
• Reverting. A fixed-period tracker or fix moves to the lender's SVR if you do nothing at the end.

To test an overpayment against a tracker, use the mortgage overpayment calculator, and read Should I Overpay My Mortgage? for when it is worth doing.