The amount you can borrow on a personal loan depends on your income, existing debts, and credit profile — not just the maximum advertised by the lender. Most people are approved for less than the headline limit. Here is exactly how lenders work it out.
Typical Personal Loan Limits by UK Lender Type (2026)
| Lender type | Minimum | Maximum | Notes |
|---|---|---|---|
| High street bank | £1,000 | £25,000 | Existing customers may access higher limits |
| Online lender | £500 | £25,000 | Often faster decisions |
| Specialist lender | £300 | £50,000 | Higher rates; stricter affordability check |
| Credit union | £50 | £15,000 | Capped APR; flexible underwriting |
| Secured homeowner loan | £5,000 | £250,000+ | Home at risk; requires equity |
How Lenders Calculate Your Maximum
Step 1: Gross-to-net income
The lender estimates your monthly take-home pay. For PAYE employees, this is straightforward. For self-employed borrowers, they use an average of 2–3 years of taxable profit.
Step 2: Essential expenditure
Lenders subtract estimated essential costs — housing costs, food, utilities, transport — based on ONS expenditure data and your postcode. This gives a rough “free income” figure.
Step 3: Existing debt obligations
Every existing monthly debt payment is deducted: mortgage, credit cards (minimum payments), car finance, any other loans, buy now pay later commitments.
Step 4: Debt-to-income ratio check
They calculate: (total monthly debt payments including new loan) ÷ monthly take-home pay. Most lenders want this below 40–45%.
Step 5: Stress test
Some lenders check whether you could still afford repayments if your income fell by 10–20%.
Worked Example
Scenario: Emma earns £38,000/year gross.
- Monthly take-home: approximately £2,530
- Existing debts: £350 mortgage contribution, £150 car finance = £500/month
- Available income after debts: £2,030/month
- Lender’s DTI comfort zone: 40% of £2,530 = £1,012/month maximum debt payments
- Maximum new loan payment: £1,012 − £500 = £512/month
At 7% APR over 5 years (60 months), a £512/month payment supports a loan of approximately £25,700 — effectively the mainstream maximum.
If Emma had a larger mortgage or car finance, her available payment capacity would shrink, and the maximum she could borrow would fall accordingly.
How to Maximise Your Borrowing Power
| Action | Effect |
|---|---|
| Pay down existing debt before applying | Increases available DTI headroom |
| Improve credit score | Unlocks lower rates and higher limits |
| Apply jointly (with partner) | Combines income assessment |
| Choose a shorter term | May be viewed as lower risk by some lenders |
| Apply to your existing bank | They have your transaction data; may lend more |
The Total Cost vs The Maximum
Being able to borrow the maximum is not the same as it being sensible. A £25,000 loan at 8% APR over 5 years costs £6,083 in interest. Borrow only what you genuinely need.
Use a loan calculator to check total repayable at different amounts and terms before applying. The Loans and Borrowing Hub has a worked-cost comparison tool.
Alternatives if You Need More
If the amount you need exceeds what you can access unsecured:
- Secured homeowner loan — borrow against equity in your property at lower rates; your home is at risk
- Further mortgage advance — some mortgage lenders allow you to increase your mortgage to fund large expenditures
- Remortgage with cashback — releasing equity through a full remortgage; consider timing against your current deal’s exit fees
For any of these, see the Mortgages section for how remortgaging works.