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How affordability checks work
Income verification, outgoings analysis, open banking data — what lenders actually assess and what to do if you're turned down.
6 min read → Financial health
Debt-to-income ratio:
what it is and how to improve yours
Understand how lenders calculate your DTI, what thresholds matter, and practical steps to bring yours down before applying for credit.
5 min read • Cash Train editorial team
What this guide covers
Your debt-to-income (DTI) ratio measures how much of your gross monthly income goes towards debt repayments. UK lenders use it — alongside your credit report — to judge whether a new loan is affordable for you. This guide explains the maths, the thresholds lenders care about, and exactly how to improve your ratio before you apply.
What is the debt-to-income ratio?
Your DTI ratio expresses your total monthly debt obligations as a percentage of your gross monthly income (before tax and National Insurance). It is a quick snapshot of how stretched your finances are relative to what you earn.
It is distinct from your credit score. A credit score tells lenders how reliably you have repaid debt in the past. Your DTI tells them how much capacity you have to take on and repay new debt right now. Lenders use both together.
Debts counted in your DTI typically include: mortgage or rent payments, credit card minimum payments, personal loan instalments, car finance, hire purchase, student loan deductions, and any other regular credit commitment. They do not usually include everyday living costs such as groceries, utilities, or insurance.
How to calculate your DTI ratio
The formula is straightforward:
DTI (%) = (Total monthly debt payments ÷ Gross monthly income) × 100
Use gross income — the figure before tax, not your take-home pay.
Worked example 1 — employed worker
Sarah earns £32,000 a year gross (£2,667/month). Her monthly debt commitments are:
- Mortgage: £680
- Car finance: £195
- Credit card minimum payment: £45
Total debt payments: £920/month
DTI = (920 ÷ 2,667) × 100 = 34.5%
Worked example 2 — self-employed
James is self-employed. His average net profit over the last two tax years is £28,000 (£2,333/month gross). Many lenders will use his SA302 figures. His monthly debt commitments are:
- Rent: £750
- Personal loan: £220
Total debt payments: £970/month
DTI = (970 ÷ 2,333) × 100 = 41.6%
Self-employed applicants should note that lenders often use a 2–3 year average of taxable profit, not a single year’s figure, and may apply a haircut to variable income.
What do UK lenders consider acceptable?
The Financial Conduct Authority’s Consumer Credit sourcebook (CONC) requires lenders to carry out a reasonable creditworthiness assessment before granting credit, which includes assessing affordability. DTI is one of the tools lenders use to meet this obligation, though each sets its own internal thresholds.
As a general guide for the UK market:
| DTI range | Typical lender view |
|---|---|
| Below 28% | Strong position. Most mainstream lenders will be comfortable. |
| 28%–36% | Acceptable. Approval likely but pricing and limits may reflect higher risk. |
| 37%–49% | Elevated. Mainstream lenders may decline; specialist lenders may lend at higher rates. |
| 50% or above | High risk. Indicates more than half of gross income is already committed to debt. Most lenders will decline unsecured credit. |
Mortgage lenders in the UK often apply a separate “stress test” on top of DTI, checking whether you could still afford repayments if interest rates rose by 3 percentage points. For short-term unsecured credit, lenders focus more directly on the monthly payment-to-income ratio.
Why your DTI matters even if your credit score is good
A credit score reflects your borrowing history. A DTI reflects your current capacity. It is entirely possible to have an excellent credit score — no missed payments, a long credit history — but still be declined because your DTI signals that another monthly repayment would be unaffordable.
This matters particularly for short-term loans, where the monthly repayment relative to your income is scrutinised carefully. Under the FCA’s Consumer Duty rules (in force from July 2023), FCA-authorised lenders must act in the best interest of customers and avoid foreseeable harm — lending to someone whose DTI indicates they cannot afford the repayments would put a regulated lender in breach of that duty. Cash Train is an unregulated lender but applies the same standard as responsible lending policy.
The practical implication: even if you pass a credit check, a high DTI can result in a decline, a lower loan amount being offered, or a higher interest rate to reflect the additional risk.
Practical steps to improve your DTI ratio
There are only two levers: reduce your monthly debt payments, or increase your income. In practice, reducing debt payments is more reliable and faster to achieve.
Pay down or close unused credit accounts
Even a credit card you rarely use will have a minimum monthly payment factored in by some lenders. Closing cards you do not need — after paying the balance — removes that commitment from the DTI calculation. Prioritise high-interest balances first (avalanche method) to save money while reducing your monthly obligations fastest.
- List every credit account and its minimum monthly payment
- Pay off the highest-rate balance first while maintaining minimums elsewhere
- Once cleared, consider closing accounts you do not actively need
Consolidate multiple debts into one lower payment
If you carry several smaller debts at high rates, a debt consolidation loan at a lower rate can reduce your total monthly payment, which directly cuts your DTI. Compare the total cost carefully — a lower monthly payment over a longer term may cost more in total interest. Use the Money Helper loan calculator (moneyhelper.org.uk) to run comparisons.
- Add up all current monthly minimum payments across all debts
- Get a consolidation quote and check the new single monthly figure
- Only consolidate if the new payment is genuinely lower and you will not accrue new debt
Avoid taking on new credit before applying
Every new credit agreement increases your monthly debt obligations. Taking out a new card, buy-now-pay-later agreement, or car finance in the months before a loan application will raise your DTI — and also trigger a hard search that temporarily affects your credit score. Give yourself at least three months of stability before applying for new credit.
- Pause any non-essential new credit applications for 3–6 months before applying
- Cancel BNPL plans you no longer need
- Check that any existing finance shown on your credit report is accurate
Increase your declared income
If you have a secondary income source — freelance work, rental income, a second job — make sure you declare it accurately on your application. Lenders may ask for evidence such as bank statements or tax returns. Do not inflate figures; lenders cross-reference what you declare against Open Banking data or payslips, and inconsistencies can result in an automatic decline.
- Declare all regular, evidenced income sources — not one-off payments
- For self-employed income, use your SA302 average over two years
- Keep payslips and bank statements ready as supporting evidence
Free debt advice in the UK
If your DTI is high because of problem debt, you do not have to manage it alone. These free services are authorised by the FCA and can help you build a repayment plan:
- StepChange Debt Charity — stepchange.org / 0800 138 1111
- National Debtline — nationaldebtline.org / 0808 808 4000
- Citizens Advice — citizensadvice.org.uk (online and local offices)
- Money Helper — moneyhelper.org.uk (government-backed guidance)
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Common questions
FAQ
Your debt-to-income (DTI) ratio is your total monthly debt payments divided by your gross monthly income, expressed as a percentage. For example, if you earn £2,000 a month and pay £600 in debt repayments, your DTI is 30%. Lenders use it to assess whether you can comfortably take on more credit.
There is no universal threshold, but as a general guide, a DTI below 30–35% is considered manageable by most lenders. A DTI above 50% suggests more than half your income is committed to debt repayments — lenders may view this as high risk. The lower your DTI when applying for new credit, the stronger your position.
We do not publish a specific DTI cut-off, but affordability is central to every decision we make. We look at your income alongside your existing committed outgoings — including existing debt repayments — to form a view of whether additional repayments would be manageable.
The two levers are reducing debt (paying more than the minimum on existing balances) and increasing income. Avoiding new credit commitments while paying down existing ones is the most reliable route. Even small extra payments on high-rate debts reduce your total committed monthly outgoing over time.
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Apply now →Warning: Late repayment can cause you serious money problems. For help, go to moneyhelper.org.uk