Does a Loan Affect a Mortgage? (2026): How Much Less You Can Borrow
Yes — a personal loan reduces how much you can borrow, because lenders count the monthly repayment against your affordability. But having a loan rarely stops you getting a mortgage. Here’s exactly how much a loan cuts your borrowing, and whether you should clear it first.
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Quick answer
Yes, a loan affects your mortgage — but usually by reducing how much you can borrow rather than stopping you altogether. Lenders assess a personal loan on its monthly repayment, deducting it from your income as a committed expenditure before working out your maximum mortgage. As a rough guide, a personal loan costing £200 a month reduces your borrowing capacity by around £10,000–£12,000, because that £200 is money that can’t go toward a mortgage payment. The key measure lenders use is your debt-to-income (DTI) ratio — your total monthly debt payments as a percentage of your income — and they generally prefer it below around 36%, with some accepting up to 43% for strong applicants. The good news: you don’t need to be debt-free to get a mortgage, and most homeowners have some credit. A loan that’s small relative to your income, that you’ve been repaying reliably, and that’s on track to finish soon is unlikely to be a problem. Some lenders even ignore a loan with fewer than six months left to run. Whether you should pay off a loan before applying depends on your situation — clearing it improves affordability, but not if it drains the deposit you need. This page covers personal, bank and secured loans; for other debts see our dedicated guides. This is general information, not advice. As of August 2026.
In this guide
How a loan affects your mortgage
When you apply for a mortgage, the lender doesn’t just look at your income — it looks at what’s already committed to go out each month, because that’s income that can’t be used to pay a mortgage. A personal or bank loan is one of the clearest committed expenditures, so it directly affects your application in two ways. First, affordability: the lender deducts your loan’s monthly repayment from your income before calculating your maximum mortgage, so the loan shrinks your borrowing power. Second, creditworthiness: how you’ve managed the loan shows on your credit file, and a history of on-time repayments actually helps demonstrate you’re reliable, while missed or late payments count against you. The important thing to understand is that a loan being on your file isn’t inherently a red flag — lenders expect most applicants to have some credit, and a well-managed loan can even be a positive. What matters is the size of the monthly commitment relative to your income, and your track record of paying it. So a loan affects how much you can borrow far more often than whether you can borrow at all.
How much less you can borrow
Lenders assess a personal loan on its monthly payment
The key to understanding the impact is that most lenders focus on the monthly repayment, not the total loan balance. They treat that monthly figure as committed expenditure and effectively remove it from the income used to calculate your mortgage. As a rough rule of thumb, at a typical 4.5× income multiple:
| Loan monthly payment | Approx. reduction in borrowing |
|---|---|
| £150/month | ~£8,100 |
| £200/month | ~£10,800 |
| £250/month | ~£13,500 |
| £350/month | ~£18,900 |
So a £10,000 personal loan repaid at around £200 a month typically reduces your maximum mortgage by roughly £10,000–£12,000. Note it’s the monthly payment that drives this, not the balance: a lender focused on monthly cost treats a £10,000 loan with 12 months left much like one with 48 months left, as long as the monthly payments are similar. However, some lenders also consider the outstanding balance, and may view a larger or longer loan less favourably. Crucially, some lenders disregard a loan with fewer than six months remaining, on the basis it’ll be gone before the mortgage really gets going — so if your loan is nearly paid off, choosing the right lender matters. This is exactly the kind of variation between lenders that a broker navigates to protect your borrowing power. To see how this fits your overall figure, use our guide to how much you can borrow.
Debt-to-income: the key ratio
Alongside raw affordability, lenders assess your debt-to-income (DTI) ratio — the percentage of your gross monthly income that goes on debt repayments. It’s calculated simply: total monthly debt payments ÷ gross monthly income × 100. A personal loan can move this ratio significantly. For example, on a £3,000 monthly income, £600 of debt payments (say a car loan and credit card) is a 20% DTI; add a £350 personal loan and it jumps to about 32%. Lenders generally prefer a DTI below around 36%, with some willing to stretch to 43% for borrowers with strong credit and income. The lower your DTI, the more comfortable lenders are and the better the rates you may access. This is why a personal loan matters: with typical UK personal loans of £5,000–£10,000 costing £180–£250 a month, they can add 5–7 percentage points to your DTI, which is enough to influence both how much you can borrow and the deals available. Bringing your DTI down — by clearing or reducing debt where it makes sense — is one of the most effective ways to strengthen a mortgage application, though as we’ll see, it has to be balanced against keeping your deposit intact.
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Should you pay off a loan before applying?
This is one of the most common questions, and the honest answer is: it depends, and there’s a genuine trade-off. Clearing a loan removes its monthly payment from your affordability calculation, which can increase your borrowing power and lower your DTI — both helpful. But there’s a catch that catches people out: don’t drain the deposit you need in order to clear a loan. A smaller deposit means a higher loan-to-value, which can push you into a worse rate band and, in some cases, reduce your options more than the loan itself did. Consider the balance:
- Paying off the loan makes sense if you have enough savings to clear it and still keep a healthy deposit, if the loan’s monthly payment is significantly denting your affordability, or if the loan has a long time left to run.
- Keeping the loan may be better if paying it off would leave your deposit too small, if the loan is nearly finished anyway (some lenders will ignore it), or if you’d only end up borrowing on credit cards later to cover moving costs.
One firm rule: never take out a new loan to fund your mortgage deposit — lenders check for this, it increases your debt, and it usually harms your application rather than helping. If you’re weighing whether to clear a loan or preserve your deposit, it’s precisely the kind of numbers question a broker can model with you against real lender criteria, rather than guessing.
Secured & homeowner loans
A secured loan (also called a homeowner loan or second-charge loan) is different from an unsecured personal loan because it’s secured against your property, sitting behind your main mortgage as a “second charge.” These affect a mortgage in particular ways worth understanding. If you already have a secured loan and want to remortgage, the secured loan has to be accounted for — you can either repay it from the remortgage, keep it in place (the new lender will factor it in), or in some cases the two are handled together. Because a secured loan is a charge on your home, it directly affects the equity available and the lender’s security, so it’s assessed more carefully than an unsecured loan. Its monthly payment still counts toward your affordability and DTI in the same way. If you’re considering a secured loan as an alternative to remortgaging — for instance to raise money without disturbing a good mortgage rate — that’s a legitimate strategy in some situations, and our guide to a second-charge mortgage explains how they work. The key point: secured loans carry the added dimension of being tied to your property, so they interact with your mortgage more directly than personal loans, and getting advice is especially worthwhile.
Other types of debt
This page focuses on personal, bank and secured loans, but lenders assess different debts in slightly different ways, and we cover the main ones separately:
- Car finance — PCP and HP deals are common and can significantly reduce borrowing; see does car finance affect a mortgage.
- Credit card debt — assessed differently again, often on a percentage of the balance; see does credit card debt affect a mortgage.
- Student loans — treated quite differently from commercial debt, as repayments are income-linked; see does a student loan affect a mortgage.
- Buy now, pay later — Klarna and similar now increasingly show on credit files; see does Klarna affect a mortgage.
- Debt consolidation — if you’re consolidating debts, a debt consolidation remortgage is a related route worth understanding.
The common thread across all of them is the same: lenders total your monthly commitments, work out what’s left, and lend against that — so reducing your monthly debt, where sensible, is the reliable way to improve your position.
The bottom line
A loan affects your mortgage mainly by reducing how much you can borrow, not by blocking you outright. Lenders assess a personal loan on its monthly repayment — as a rough guide, £200 a month cuts your borrowing by around £10,000–£12,000 — and factor it into your debt-to-income ratio, which they like to see below roughly 36%. You don’t need to be debt-free: a well-managed loan that’s small relative to your income, or nearly paid off, is rarely a problem, and some lenders ignore loans with under six months left. Whether to clear a loan before applying is a genuine trade-off — it helps affordability, but not if it leaves your deposit too small. Never borrow for a deposit. Above all, because lenders vary so much in how they treat loans, matching to the right one is the single biggest thing that protects your borrowing power.
Got a loan and planning a mortgage? Get matched with an FCA-regulated, whole-of-market broker who’ll find the lenders most generous with your situation — free, no obligation.
Does a loan affect a mortgage? FAQs
Does having a loan affect getting a mortgage?
Yes, but usually by reducing how much you can borrow rather than preventing you from getting a mortgage at all. Lenders assess a personal loan on its monthly repayment, deducting it from your income as a committed expenditure before calculating your maximum mortgage. As a rough guide, a loan costing £200 a month reduces your borrowing capacity by around £10,000 to £12,000. Lenders also factor the loan into your debt-to-income ratio, which they generally prefer below about 36%. However, you don’t need to be debt-free — most homeowners have some credit. A loan that’s small relative to your income, well managed with on-time payments, and on track to finish soon is unlikely to be a problem. Some lenders even disregard loans with fewer than six months remaining.
How much less can I borrow with a personal loan?
As a rough rule of thumb, at a typical 4.5 times income multiple, your borrowing reduces by roughly the annual cost of the loan multiplied by the income multiple. So a loan costing £150 a month reduces borrowing by around £8,100, £200 a month by around £10,800, £250 a month by around £13,500, and £350 a month by around £18,900. This is because lenders treat the monthly repayment as committed expenditure and remove it from the income used to calculate your mortgage. Importantly, it’s the monthly payment that drives this, not the total balance — though some lenders also consider the outstanding balance and may view larger or longer loans less favourably. These are approximate figures; the exact impact varies by lender, your income, and their stress rate, which is why comparing lenders matters.
Should I pay off my loan before applying for a mortgage?
It depends on your situation, and there’s a real trade-off. Paying off a loan removes its monthly payment from your affordability calculation, increasing your borrowing power and lowering your debt-to-income ratio. However, you shouldn’t drain the deposit you need in order to clear a loan, because a smaller deposit means a higher loan-to-value, which can push you into a worse rate band and reduce your options more than the loan did. Paying off the loan makes sense if you can do so while keeping a healthy deposit, if the monthly payment significantly dents your affordability, or if the loan has a long time left. Keeping it may be better if clearing it leaves your deposit too small or the loan is nearly finished. Never take out a new loan to fund a deposit — lenders check for this and it harms your application.
Does a loan affect a mortgage renewal or remortgage?
Yes, a loan is assessed when you remortgage or move to a new deal, much as it is for a new mortgage. When you remortgage with a new lender, they reassess your affordability, so any personal loan’s monthly payment is factored into how much they’ll lend and your debt-to-income ratio. If your circumstances have worsened or your debts have grown since your last mortgage, this could affect the deals available. However, if you’re simply doing a product transfer with your existing lender (staying put and switching to a new rate), the affordability reassessment is often lighter or not required, so an existing loan may have less impact. A secured loan against your property needs particular attention at remortgage, as it must be accounted for alongside the main mortgage. A broker can advise on the best approach for your renewal.
Does a secured or homeowner loan affect your mortgage?
Yes, and in some particular ways. A secured loan (also called a homeowner loan or second-charge loan) is secured against your property, sitting behind your main mortgage as a second charge. Its monthly payment counts toward your affordability and debt-to-income ratio just like any loan. But because it’s a charge on your home, it also directly affects the equity available and the lender’s security, so it’s assessed more carefully than an unsecured personal loan. If you want to remortgage while you have a secured loan, it must be accounted for — you might repay it from the remortgage, keep it in place with the new lender factoring it in, or handle both together. Secured loans carry this added dimension of being tied to your property, so they interact with your mortgage more directly, and getting advice is especially worthwhile.
Can I get a mortgage if I have a loan?
Yes, absolutely — having a loan does not prevent you from getting a mortgage, and most mortgage applicants have some form of credit. What a loan does is reduce how much you can borrow, because its monthly repayment is deducted from your income when lenders calculate affordability. As long as you can still afford the mortgage you need after that deduction, and your debt-to-income ratio is acceptable (generally below around 36%, sometimes up to 43%), a loan is no barrier. Lenders actually view a well-managed loan positively, as consistent on-time repayments demonstrate you’re a reliable borrower. The factors that help most are a loan that’s small relative to your income, a strong repayment history, and ideally a loan that’s on track to be paid off soon. Matching to a lender whose criteria suit your circumstances is the key to maximising what you can borrow.
- MoneyHelper — free, government-backed money guidance
- FCA — information for consumers
Important information
nextmove is an introducer, not a lender, mortgage adviser or debt adviser. This article is general information only and does not constitute financial advice. How lenders treat loans — the calculation method, the income multiple, debt-to-income limits, and whether loans near their end are disregarded — varies significantly between lenders and changes over time; the figures here are illustrative rules of thumb, not quotes, and your actual borrowing depends on your income, deposit, credit profile, the loan and lender criteria. Whether to repay debt before applying is a personal financial decision that depends on your circumstances. We introduce you to FCA-regulated, whole-of-market mortgage brokers who can assess your situation and advise, and we may receive a fee or commission for doing so.
Your home may be repossessed if you do not keep up repayments on your mortgage.
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