Quick answer
Yes — car finance reduces your mortgage borrowing. Lenders count a PCP, HP, lease or car loan payment as committed monthly expenditure, so a £300/month PCP typically cuts your maximum by around £12,000–£18,000, depending on the lender's income multiple and how strictly it applies the commitment. Agreements with under 6 months remaining are ignored completely by some lenders, and treatment otherwise varies more between lenders than most borrowers expect.
How lenders treat car finance (PCP, HP, leases and loans)
Whatever the agreement is called, lenders assess it the same way: they take the monthly payment shown on your bank statements or credit file and count it as a committed outgoing, then apply their affordability model to whatever income is left over. The type of agreement rarely changes the treatment.
PCP (Personal Contract Purchase) is the most common form of car finance, and the one most borrowers ask about. The monthly payment is counted; the optional balloon payment at the end of the agreement is not, because it is not a committed monthly cost.
HP (Hire Purchase) and personal loans taken out to buy a car work the same way — the regular instalment is deducted from available income, in the same manner as a credit card minimum payment or a personal loan for any other purpose.
Leases (personal contract hire)are treated identically to a loan repayment for affordability purposes, even though you never own the car. The monthly rental is a committed cost, and that is all most lenders' calculations look at.
You may have come across the widely-circulated rule of thumb that every £100 a month in commitments costs around £20,000 of borrowing. That figure is roughly the right order of magnitude at some lenders that run a full, stress-tested affordability assessment rather than a simple income multiple. For the more common 4.5×–5× income-multiple lenders this calculator models, the real reduction for a £100/month payment is closer to £4,000–£6,000 — which is exactly why a single folk-rule number is misleading. The real spread for the same payment can run from a few thousand pounds up to around £20,000 depending entirely on which lender, and which affordability model, you land on.
The under-6-months rule
The single biggest variable in how car finance affects your mortgage is not the payment amount — it is how many months are left on the agreement. A meaningful group of lenders will disregard a committed payment entirely once fewer than around six months remain, on the basis that it will be settled before or shortly after your mortgage completes and will not overlap with your new mortgage payment for long.
Other lenders take a stricter view and count the payment in full regardless of how close it is to ending. That single difference in policy can be worth the entire impact of the car finance shown by the calculator above — restoring your maximum borrowing to what it would be with no car finance at all, at the lenders that apply the disregard.
There is a related, uncalculated nuance worth knowing: if the outstanding balance could be cleared from savings rather than simply run down to zero, some lenders will also discount the payment where you can evidence your intent to clear it — for example by showing the savings exist and confirming the agreement will be settled. This calculator does not attempt to model that scenario, because it depends on evidence and lender discretion rather than a fixed formula; it is simply worth knowing the option can exist.
Car finance vs credit score — two different effects
It is easy to conflate two separate things that car finance does to a mortgage application, and worth keeping them apart.
The affordability effect is what this calculator measures: the monthly payment reduces the income a lender treats as available, which reduces the maximum it will lend you. This happens even if every payment has been made on time, because it is simply a commitment competing with your new mortgage payment for the same income.
The credit-score effect is separate and comes from how the agreement has been managed, not how large it is. Missed or late payments on car finance are reported to credit reference agencies and can damage your credit score, which affects which lenders are willing to consider you at all — regardless of the size of your income or deposit. A car finance agreement paid perfectly on time has no negative credit-score effect; it still has an affordability effect, because the payment itself still counts as a commitment.
Frequently asked questions
Does PCP affect mortgage applications?
Yes. Lenders treat a PCP (Personal Contract Purchase) payment the same way as any other committed monthly outgoing — it is deducted from the income available before your affordability calculation is applied. A typical PCP payment can reduce your maximum borrowing by tens of thousands of pounds, though the exact amount depends on the lender's model and how many months remain on the agreement.
Should I pay off my car finance before applying for a mortgage?
This is a decision to weigh up rather than a rule to follow — clearing the payment removes it from your committed expenditure, but it also uses savings that could otherwise go toward your deposit or costs. This calculator shows you what the numbers do with and without the payment; whether clearing it is the right call for you depends on your wider deposit position and timeline, which is worth thinking through carefully rather than acting on a rule of thumb.
Does a lease count the same as a loan?
For affordability purposes, broadly yes. A personal contract hire (lease) payment, an HP instalment, a PCP payment and a personal loan repayment for a car are all committed monthly outgoings, and most lenders' affordability calculations do not distinguish between them — the monthly figure is what matters, not the label on the agreement.
What if my car finance ends soon?
It can work in your favour. A number of lenders disregard a committed payment once fewer than around six months remain on the agreement, on the basis that it will be settled before or shortly after your mortgage completes. Others still count it in full regardless of the remaining term, which is why the same near-finished agreement can produce noticeably different maximum borrowing figures from lender to lender.
Do lenders see my car finance?
Almost always, yes. Car finance agreements appear on your credit file and are also disclosed on your mortgage application and bank statements, so lenders see both the commitment itself and the regular debit leaving your account. Missed or late payments affect your credit score and can influence which lenders will consider you at all — that is a separate effect from the monthly payment simply reducing how much you can borrow.
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Last updated: July 2026
