Homeowners moving property in July spent an average 14.4% of their income on mortgage interest, according to UK Finance figures reported on 3 October. That was up from 13.5% a year earlier and the highest proportion since November 2008. For families planning their next move, the figures highlight the importance of calculating the new mortgage cost before committing to a purchase.
These borrowers already own a home. They may have accumulated significant equity, maintained a good payment record and seen their income increase. Nevertheless, buying the next property can introduce a much larger loan, different pricing or a combination of old and new mortgage products.
The practical question is whether the proposed move fits the household budget once the borrowing has been rebuilt around the new property. That needs a more detailed answer than a maximum loan figure or a quick estimate based on the current monthly payment.
What the New Figures Measure
14.4% of income went on mortgage interest. The reported July figure compares with 13.5% a year earlier and 7.8% four years earlier.
The measure isolates home movers. It concerns existing homeowners taking the next step, rather than first-time buyers or all outstanding mortgages.
Interest is only part of a repayment mortgage payment. Capital repayments are additional. The statistic should not be read as showing that the complete monthly mortgage payment consumes just 14.4% of income.
Substantial Equity Does Not Fix the Monthly Budget
Equity can make a homeowner appear well placed to move. It provides a deposit for the next purchase and can reduce the required loan-to-value. But it does not determine the interest rate, mortgage term or amount of additional borrowing needed.
A family selling a £600,000 home with a £300,000 mortgage has £300,000 of gross equity. Buying at £900,000 and applying all that equity to the purchase would require a £600,000 mortgage, before allowing for moving costs or any other cash contribution. The loan balance has doubled even though the property price has increased by 50%.
The available deposit must also be calculated after the relevant deductions. Selling fees, legal costs, purchase taxes, removals and other expenditure can reduce the money available for the next property. If those costs are paid from savings instead, the family needs to decide how much cash to retain after completion.
What Happens to Your Existing Fixed Rate?
A portable product may allow its pricing to be used on a new home, subject to the lender’s approval. Nationwide’s guidance explains that porting involves a new mortgage application and current lending criteria. The property and borrowing requirement therefore need checking before the existing rate is treated as part of the purchase budget.
Additional borrowing may sit on a separate product. That creates a combined payment drawn from two balances, potentially at different rates and with different expiry dates. The useful comparison is the complete cost of that arrangement against a suitable replacement mortgage.
The timing matters as much as the initial calculation. If the retained fixed rate has only a few months left, its benefit is temporary. The budget needs a second view showing what happens when that part of the debt requires new pricing.
A £600,000-to-£900,000 Move: The Payment Difference
The following illustration shows why the existing rate can materially affect the first stage of a move. Assume the family’s current £300,000 mortgage carries a 2% rate and has 25 years remaining on a capital repayment basis. Its monthly payment is approximately £1,272.
For the £900,000 purchase, assume £300,000 of gross equity is applied and the required mortgage is £600,000. If the lender permits the existing £300,000 product to be ported and the additional £300,000 is borrowed at an illustrative 5.5%, both over 25 years, the combined payment is approximately £3,114 a month.
If the whole £600,000 were instead borrowed at the illustrative 5.5% rate over the same term, the monthly payment would be approximately £3,685. Neither rate is a current quotation. The purpose is to show how the balance split changes the calculation.
| Position | Mortgage Structure | Approximate Monthly Payment |
|---|---|---|
| Current home | £300,000 at 2% | £1,272 |
| Move with a port and additional borrowing | £300,000 at 2% plus £300,000 at 5.5% | £3,114 |
| Move with a replacement mortgage | £600,000 at 5.5% | £3,685 |
Keeping the old rate reduces the illustrated initial cost, but the moving payment is still around £1,842 higher than the current payment. The additional borrowing accounts for that increase. A family can preserve favourable pricing on one balance and still face a substantial change in monthly expenditure.
Establish the Moving Cost Before Setting the Purchase Budget
Compare the current mortgage, any portable balance, additional borrowing, fees and payments after the existing deal expires. Willow can review the structure around your expected sale and purchase.
Explore Residential Mortgage Options →Compare the Move Over a Realistic Timetable
A comparison based only on the first monthly payment can favour an arrangement whose advantage disappears quickly. Where two mortgage parts have different product end dates, the review should show the payment now and the position when each deal finishes.
The same principle applies to staying put. If the current fixed rate ends soon, remaining in the existing property may also involve a change in mortgage cost. A fair assessment compares moving and staying over the same period, using clearly stated assumptions for any future pricing.
No one can guarantee the rates available at a later expiry. The useful approach is to test a range of payments and establish the household’s tolerance for a higher cost. That gives the buyer a firmer budget than assuming the most favourable outcome.
Your Old Fixed Rate Has an End Date
Where porting is available, it preserves the benefit for the remaining product period. The home-mover budget should remain workable after that period ends, particularly when additional borrowing has already increased the monthly commitment.
A Longer Term Changes the Payment and the Debt Timetable
Extending a repayment term can reduce the monthly payment by spreading capital repayments over more years. Keeping the same balance and interest rate for longer generally increases the total interest paid, so the lower monthly figure needs to be assessed alongside the longer obligation.
The proposed term should fit the household’s plans for retirement, income and other major commitments. It may also affect how quickly equity is rebuilt after the move. For a family expecting future school fees, reduced working hours or a change in employment, those considerations can be significant.
Changing repayment basis requires a different assessment. Interest-only borrowing leaves capital outstanding and needs a credible repayment strategy acceptable to the lender. It may be suitable in some circumstances, but the reduction in scheduled monthly payments does not remove the debt.
Downsizing Can Also Need a Mortgage Review
A lower purchase price can reduce borrowing and improve monthly affordability. However, a smaller new loan may involve repaying part of an existing balance that remains subject to an early repayment charge. The charge must be included when calculating the cash released.
The sale and purchase timetable also matters. If the two transactions do not complete together, the lender’s rules may affect the ability to retain the product or recover a charge. Those conditions should be confirmed for the actual lender rather than assumed from another borrower’s experience.
For a downsizer, the review should therefore show the net cash released, the remaining mortgage, transaction costs and any charges. That is the amount available for the next stage of life, rather than the headline difference between the two property prices.
Higher Earners Still Need a Household Cost Review
A strong income can support a larger mortgage, but lender approval and comfortable household expenditure are separate judgments. Buyers may have childcare, school fees, existing credit commitments or variable income that makes a higher monthly payment less attractive than the maximum borrowing figure suggests.
For larger loans, the treatment of bonuses, company income or other earnings can also influence which lenders are suitable. The borrower needs an executable funding route based on evidence, alongside a personal budget that remains comfortable if income is lower than expected.
That distinction is useful to estate agents and buying agents. Significant equity may make a buyer look proceedable, but the mortgage structure still needs checking. Early finance work can identify a realistic purchase range and reduce the risk of a payment problem emerging after a property has been selected.
What a Home-Mover Cost Review Should Show
A useful review connects the sale proceeds, purchase price and mortgage structure in one calculation. It should make clear what is known, what depends on lender approval and which future costs are assumptions.
The review can then test the decisions within the buyer’s control. A lower target purchase price, additional cash contribution or different timing may improve the position. Each choice should be considered alongside retained savings and the reason for moving.
How Willow Private Finance Can Help
Willow can assess the existing mortgage and proposed purchase together, including porting where available, additional borrowing and suitable alternatives across the market. The comparison includes the repayment basis, term, fees, timing and relevant lender criteria.
The objective is to establish a workable purchase budget and a clear payment plan. For some households, that will support the intended move. For others, it may point towards a different property price, more time to build equity or retaining the current home for longer.
The latest figures show why this exercise matters. Existing homeowners need to understand what their next borrowing arrangement will cost, even when their current mortgage is comfortable and their equity position is strong.
Frequently Asked Questions
Practical questions for homeowners considering a move.
Does the 14.4% figure include capital repayments?
No. The reported measure concerns mortgage interest relative to income. A repayment mortgage also includes capital repayments, so the figure is not the proportion of income spent on the full mortgage payment.
Can I keep my existing fixed rate when I move home?
Possibly, if the product is portable and the lender approves the new application. Check the mortgage terms, borrowing requirement, property and lender criteria. Portability is not a guarantee of approval.
Will additional borrowing use my existing mortgage rate?
Do not assume so. Additional borrowing may require a separate product at the lender’s available pricing, with its own fees and expiry date. Compare the combined payments and what happens when each product ends.
Can downsizing still trigger an early repayment charge?
Yes, depending on the mortgage terms. If you repay borrowing that is subject to an early repayment charge, including an amount not carried into the new mortgage, a charge may apply. Confirm the calculation and any allowance with the lender.
Will extending the term make moving home cheaper?
A longer repayment term can reduce monthly payments, but keeping the same balance and rate for longer generally increases total interest. Lender eligibility, age, retirement income and the overall repayment plan must also be considered.