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Calculator UK10 ยท When Your Fix Ends. The UK Mortgage Handbook

Your 90-day plan

Everything in the book condensed into three months of specific actions, in order, biggest money first โ€” with your own figures filled in and a date against each one.

Nothing you type here leaves your phone. We don't store it and we can't see it. The math runs on your device.

Cover of When Your Fix Ends. The UK Mortgage Handbook

This calculator goes with When Your Fix Ends. The UK Mortgage Handbook by JP O'Connor. The book explains what the numbers mean and what to do next.

Your mortgage

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Your other debts

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How to use the dates

They run from today. Print the table, or write the six dates in your calendar with the action next to each. The order matters more than the dates: the biggest money is in week one, and every week of drift on the Standard Variable Rate costs you the week-one figure divided by four.

Week one is the whole book in an afternoon

Find four numbers โ€” balance, years remaining, current rate, the date your fix ends โ€” and then ask your lender for the full list of products you are eligible for, with the rate, the arrangement fee, the early repayment charge and the revert rate for each. Ask for the switch-to-a-better-rate cut-off date in writing, because gov.uk and UK Finance give different answers: gov.uk says "until their new term begins", UK Finance's own FAQ says "up to two weeks before". Assume the earlier one.

You can lock a rate six months early

Under the Mortgage Charter you can secure a new deal up to six months before your fix ends, and still switch to a better one if rates fall before the new term starts. In H1 2026, 880,635 mortgages were locked in that way. In a rising market the six-month lock is protection, and the earlier you take it the better.

The thing you are most afraid of is the thing that almost never happens

Between July 2023 and June 2026, across the whole Mortgage Charter population, the number of properties repossessed within twelve months of a first missed payment was 376. Over the same period around 354,000 mortgages โ€” 3.9% of all regulated mortgage contracts โ€” had payments temporarily reduced with no affordability check and no credit-file mark. The system is far more forgiving than the fear suggests, but only for people who pick up the phone.

Free means free

StepChange, National Debtline, Citizens Advice and MoneyHelper are all free, and none of them will charge you to set up or run a debt management plan. If you are asked to pay for debt advice, you are talking to a commercial firm, not a charity. The same goes for motor finance redress: claims firms take a cut of money you can claim yourself for nothing.

What Breathing Space does and does not do

Standard Breathing Space gives 60 days with interest, charges, contact and enforcement frozen on your arrears. It does not pause your ongoing monthly mortgage payment, which you must keep making throughout along with rent, utilities, council tax instalments and insurance. Student loans, court fines, child maintenance and Universal Credit advances are excluded outright. You can only get it through an approved debt adviser, once in any twelve months, and it covers England and Wales only.

Before you use this

This is general information, not financial advice. It does the math on the numbers you type in. It does not know your circumstances, and it does not recommend any lender, product or course of action. Nothing you type here is stored or sent anywhere. It stays on your phone and disappears when you close the page. There is no account, no sign-up and nothing saved.

Check this one. The year-one figure adds three things you have to actually do: switch off the SVR, find the bills savings you estimated, and put the spare money at your most expensive debt. Change any of the three inputs and the total moves. The debt figures hold each minimum payment steady, and a student loan should be left out of the list entirely โ€” calculator UK9 explains why.

Get the full handbook

Cover of When Your Fix Ends. The UK Mortgage Handbook

United Kingdom · 173 pages · JP O'Connor

When Your Fix Ends.

The UK Mortgage Handbook

Your fixed deal is ending. Doing nothing is the expensive option.

  • The product transfer that needs no affordability check at all
  • When an early repayment charge is worth paying, and when it never pays back
  • What the Standard Variable Rate costs against a new fix, on your own balance
  • A 90-day plan, template letters to your lender and a one-page checklist

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