What mortgage can you get for £400 to £500 a month?

If you’re planning for a mortgage repayment of £400 to £500 per month, the next question is usually: what size mortgage does that translate to? The honest answer is that there isn’t one fixed figure. Your potential borrowing depends mainly on the interest rate, deposit (loan-to-value/LTV), mortgage term, and the type of mortgage.

This guide explains how those variables interact, so you can estimate a realistic mortgage range and understand what could move it up or down.

A realistic starting point: repayment amount vs mortgage size

To show the relationship between monthly repayments and borrowing, it helps to look at illustrative examples.

The tables below are illustrations only. They assume a repayment mortgage, a 10% deposit, and a 25-year term. They are not lender quotes and do not include all costs (for example, fees, insurance, or any changes to rates).

£400 a month (repayment)

£450 a month (repayment)

£500 a month (repayment)

What this shows: within a given repayment budget, a relatively small change in interest rate can noticeably affect the mortgage size you can support.

Calculate your maximum borrowing (it’s not only about the monthly figure)

Lenders don’t simply take your preferred repayment amount and offer a mortgage based on that. They assess affordability using factors such as:

• Your income (and how stable it is)
• Your monthly outgoings (including existing credit commitments)
• Household circumstances
• The mortgage term and rate you’re applying for
• Your credit profile

A useful way to think about it is that £400–£500 per month is your repayment target, while affordability is about whether you can sustain the mortgage payments under the lender’s assessment.

Factors that impact what mortgage you can get for £400–£500 a month

1) Interest rate

The interest rate is often the biggest driver of how much you can borrow for a set repayment.

• Lower rates generally allow a larger mortgage for the same monthly payment.
• Higher rates generally mean you may need a smaller mortgage to keep repayments within budget.

Even if your monthly target stays the same, the mortgage size can shift because interest affects how much of each payment goes towards interest versus capital.

2) Deposit and LTV

Your deposit determines your loan-to-value (LTV).

A higher deposit can help in two ways:

• It may improve your LTV position, which can affect the range of products available.
• It can influence the interest rate you’re offered.

Because both product availability and pricing can change with LTV, deposit size can indirectly affect what mortgage you can support at £400–£500 per month.

3) Mortgage term length

Term length has a direct impact on monthly repayments.

• Longer terms usually reduce the monthly repayment for a given mortgage size.
• Shorter terms usually increase the monthly repayment.

However, longer terms typically mean you pay more interest overall.

To illustrate how term changes borrowing for the same repayment, here’s an example for a £450 per month repayment at 5% with a 10% deposit (illustrative only):

4) Mortgage type

Different mortgage types can behave very differently.

• Repayment mortgages: your payments cover both interest and capital.
• Interest-only mortgages: your payments cover interest only, with the capital repaid later (typically via a repayment plan or another strategy).

Because the capital repayment structure differs, the same monthly payment can support different borrowing amounts depending on the product.

5) Credit history and affordability details

Your credit history and wider affordability picture can affect:

• The interest rate you’re offered
• The products you can access

If your rate is higher than expected due to your circumstances, it can reduce the mortgage size you can support while keeping repayments within £400–£500.

How to use £400–£500 a month to estimate your home budget

A practical approach is to work backwards from your repayment comfort level:

1. Start with your repayment range (£400–£500).
2. Consider realistic interest rate scenarios and term lengths.
3. Factor in your deposit and resulting LTV.
4. Remember affordability checks consider more than just the repayment number.

This helps you avoid focusing only on the mortgage amount and missing the wider picture—especially how deposit, term, and rate can influence the purchase price you can target.

Common scenarios to keep in mind

If you’re aiming for a smaller mortgage

A £400–£500 repayment budget can still support a meaningful mortgage, particularly if your deposit improves your LTV position and you’re able to secure a competitive rate.

If you’re stretching your budget

If your repayment target is close to the top end of what you can afford, small changes—such as a higher rate or a shorter term—can have a noticeable impact on the mortgage size you can support.

If you’re considering interest-only

Interest-only options can be relevant in some circumstances, but they come with additional considerations because the capital isn’t repaid through monthly payments in the same way as a repayment mortgage.

Summary

A mortgage repayment of £400 to £500 per month can correspond to a range of borrowing amounts, depending on:

• Interest rate
• Deposit / LTV
• Term length
• Mortgage type
• Affordability assessment (income, outgoings, and credit profile)

Illustrative repayment-to-borrowing examples can help you understand what’s possible, while affordability checks determine what lenders may actually consider.