Remortgage Guide
Top ten budgeting checks to do before you apply for a remortgage (UK)
A remortgage application isn’t just about your rate — it’s about whether the new payment is comfortably affordable once your real-life bills, debts and day-to-day spending are included.
Featured insight
Ensure your new payment is comfortably affordable.
Mortgage lenders assess affordability using your income, outgoings and employment security, and they’ll usually ask for documents like bank statements and payslips.
The 10 budgeting checks, each with a practical next step
1) Build a true monthly budget from your last 3–6 months
Do not rely on estimates. Use your bank statements and bills to calculate your average monthly essentials and day-to-day spending (food, travel, children, subscriptions and similar costs). MoneyHelper’s budget planner recommends having payslips, bank statements and bills to hand.
Example: Your average spend might be £2,500/month, but in December and August it spiked to £3,200.
Why this matters: Lenders look for consistency. Using just one month might miss these spikes, whereas a 6-month average smooths out expensive periods like Christmas or summer holidays to give a true picture of what you can afford year-round.
2) Stress-test the mortgage payment, not just the “headline” payment
Check your budget still works if your payment rises. UK rules require lenders to consider likely future interest rate rises for affordability in many cases (stress testing for a minimum of 5 years, with key exceptions).
Example: If your new mortgage payment is £900, check if you could still afford it at £1,100.
Why this matters: Interest rates change. If your deal ends or rates rise by 2% in the future, your payment will increase. Lenders stress-test in this way to reduce the risk of future payment difficulties.
3) List every committed outgoing (the costs you cannot realistically pause)
Include: loans, credit cards (minimum payments), overdrafts, car finance, childcare, insurance, phone contracts, subscriptions, maintenance payments, etc. Lenders look at income and outgoings when deciding what’s affordable.
Example: Your committed bills (loans, car finance, council tax) might total £800/month.
Why this matters: This money is effectively committed before you cover day-to-day living costs. Lenders deduct this £800 from your income to calculate your disposable income, which directly reduces the maximum mortgage they may offer.
4) Check whether debt repayments are “hiding” in your spending
Many people forget things like BNPL instalments, PayPal credit, subscription bundles, or small direct debits that add up.
Example: A £15 monthly beauty box subscription or £9.99 streaming service.
Why this matters: It may seem minor, but five or six small subscriptions can quickly add up to £100 or more a month. If you do not account for them, an underwriter may see them on your bank statements and question the accuracy of the figures provided.
5) Confirm your “surplus” after everything is paid
Once you’ve listed essentials + committed bills, what’s left? That surplus is what protects you from rate rises, repairs, and life changes.
Example: After all bills and the new mortgage, you aim to have at least £200 left over.
Why this matters: A budget with no margin for error is risky. Lenders rarely approve borrowing that leaves no spare capacity because unexpected costs such as boiler repairs or car bills can arise at any time.
6) Plan for known upcoming cost increases
If you know costs are rising soon (childcare change, insurance renewal, commuting, energy, etc.), build that into your budget before you apply.
Example: You know your nursery fees are increasing by £50/month next term or car insurance is due in June.
Why this matters: A mortgage is a long-term commitment. If a known cost is about to increase, factoring it in now shows the lender you are planning responsibly and helps ensure the mortgage remains affordable next year, not just today.
7) Budget for remortgage fees and any early repayment charges (ERCs)
Remortgaging can come with legal, valuation and admin costs, and you may face ERCs if you end your current deal early.
Example: Your current fixed rate ends on 30 Nov 2026. Prior to that date, you might have to pay a 1-5% penalty.
Why this matters: It can undermine the benefit of switching. If you save £50 a month but pay a £3,000 penalty to leave early, the change may not be worthwhile. Always check the date on which any ERCs stop applying.
8) Check you can evidence income cleanly (and it matches your budget)
You’ll typically need proof like payslips and bank statements. MoneyHelper notes lenders may ask for current account bank statements for the last three to six months and payslips.
Example: If you are self-employed, dividends might appear quarterly, not monthly.
Why this matters: An underwriter can only assess income they can verify. If your income is irregular or not supported by documents such as an SA302, they may exclude part of it, which can reduce your borrowing capacity.
9) Review your bank statements like an underwriter would
Lenders may request bank statements for several months — Nationwide says it may ask for up to 6 months, depending on circumstances.
Example: Frequent use of an unauthorised overdraft, "returned direct debits", or gambling transactions.
Why this matters: A returned direct debit suggests that your account came under pressure that month. If a lender sees that pattern repeatedly, it may treat the application as higher risk and ask more questions or decline it.
10) Make your “new payment” fit your life — not just your lender’s maximum
MoneyHelper’s affordability guidance highlights that what you can borrow depends on income, outgoings and circumstances — but your personal comfort level matters too.
Example: You might choose a 5-year fixed rate for stability, even if a 2-year tracker is slightly cheaper.
Why this matters: The maximum a lender will offer is not a target. Your own comfort level matters more. It is often better to borrow less, or choose a slightly more expensive fixed rate, if that gives you greater confidence that your bills remain manageable.
Practical next step
If you want a quick affordability check before you apply, use the form and we can review the figures with you.
What to include in the form
- Current mortgage balance + deal end date
- Estimated property value
- Household income (and how it’s paid: salary / self-employed / variable)
- Monthly committed bills + debt payments
- Any upcoming changes (childcare, job change, etc.)
- Your goal (lower payment, raise funds, shorter term, fixed-rate certainty)
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Frequently Asked Questions
Do lenders check my spending when remortgaging?
They usually assess affordability using your income and outgoings and often ask for bank statements as evidence.
How far back do bank statements go for a mortgage/remortgage?
MoneyHelper says bank statements are commonly requested for the last three to six months, and Nationwide says it may ask for up to 6 months depending on circumstances.
What’s the biggest budgeting mistake before a remortgage?
Focusing on the new monthly payment without stress-testing for future rate rises and real-life costs.
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Clarity helps
Clear, well-organised evidence of your income and spending will usually make the application process smoother.