£300000 Mortgage – Repayments & Income Requirements 2024

By Kristian Derrick

Last Reviewed: 8th February 2024

A mortgage is one of the most significant commitments you’ll make in your financial life.

It will likely be your most considerable monthly expenditure, and knowing how much you’ll pay each month will help you understand the actual cost of your target home.

If you’re considering taking out a £300,000 mortgage, this guide will show you how the monthly repayments are calculated, how much income you need to qualify, and the factors that can affect your application.

Monthly Repayments On A £300k Mortgage

Different customers can make differing monthly repayments for a £300k mortgage because the figures are calculated based on personal factors like:

  • Your income and employment type.
  • Your credit rating.
  • Your interest rate.
  • The length of the mortgage.
  • Your repayment type.

Here’s an example of how monthly repayments can differ based on the interest rate and term:

        Interest Rate



1% 2% 3% 4% 5%
10 Years £2,628 £2,760 £2,897 £3,037 £3,182
15 Years £1,795 £1,931 £2,072 £2,219 £2,372
20 Years £1,380 £1,518 £1,664 £1,818 £1,980
25 Years £1,131 £1,272 £1,423 £1,584 £1,754
30 Years £965 £1,109 £1,265 £1,432 £1,610

How Much Do You Need To Earn To Qualify?

Lenders will use multiples of your salary or income to determine how much you can borrow.

Some will offer loans at four times your annual income, while others will offer 4.5 x, 5x, or 6x under the right conditions.

Therefore, to qualify for a £300k mortgage, you’ll need to earn £75,000 annually based on 4x your income, £60,000 based on 5x income, and £50,000 based on 6x your income.

However, the income requirements can differ among mortgage lenders as they assess applications case-by-case when deciding.

Mortgage lenders assess your debt-to-income ratio to determine your affordability.

They’ll look at your monthly income minus any outgoings.

A lower debt-to-income ratio is more attractive because it shows lenders you have more disposable income for mortgage repayments.

Such outgoings can include:

  • Utility bills like water, gas, or electricity.
  • Council tax.
  • Childcare costs.
  • Credit cards.
  • Car insurance.
  • Home and content insurance.
  • Broadband and TV packages.
  • Car finance.

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How The Interest Rate Affects Monthly Repayments

The interest rate on the mortgage determines how much your loan balance grows each month. The higher the interest rate, the higher the monthly repayments.

Mortgage interest can be fixed or variable, affecting your monthly repayments.

With fixed mortgage rates, the interest rate and monthly repayments remain the same for a certain period.

With variable mortgage rates, the interest rate can go up or down from month to month, meaning the amount you repay monthly is subject to change.

The right deal will depend on your circumstances and what you want from the mortgage.

How Much Deposit Do You Need?

The deposit required by the mortgage lender will depend on the price of the property you’re buying and whether you’re classed as high or low risk.

Most lenders set the maximum loan to value (LTV) ratio at 90%, meaning you’ll need a deposit of 10%.

The LTV shows how much of the property you own outright. Some can accept as little as a 5% deposit, while others will need you to put down more if you’re considered higher risk because of issues like bad credit.

Size matters when it comes to residential mortgage deposits, and it can affect the interest rates you get, which affects your monthly repayments.

A larger deposit means a lower LTV, and it increases your chances of getting favourable rates from more lenders as they consider the mortgage a lower risk.

If the total amount of the property you’re buying costs £300,000 in the market and lenders need a 10% deposit, you’ll need to make a £30,000 down payment.

You would then borrow £270,000 from the mortgage lender.

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How The Term Affects Repayments

Generally, the longer the mortgage term, the less you’ll pay each month in repayments.

However, you’re likely to pay back more overall because you’ll pay interest on the loan for a more extended period.

A shorter term means you’ll pay more per month, but the overall cost of the loan will be lower.

If you have a £300k mortgage with a term of 30 years and an interest rate of 3.92%, you’ll pay £1,418 monthly and £510k in total.

However, if you get the mortgage for a term of 10 years, you’ll make monthly payments of £3,026 and pay £363k in total.

How The Repayment Type Affects Monthly Repayments

You can choose between repayment and interest only mortgages, which will affect how much you pay each month.

With repayment mortgages, you make one payment per month, part of which goes towards repaying the capital, and the rest covers the interest.

With interest only mortgages, you’ll only pay off the interest each month and repay the whole loan amount at the end of the term.

Your monthly payments will be higher in a repayment mortgage than in an interest-only mortgage.

Interest only mortgages are suitable if you want to keep monthly costs down.

However, the amount due at the end of the term can reach significant amounts, and lenders will need proof of a repayment strategy to pay off the capital in one lump sum.

Lenders will require you to put down more significant 25% to 30% deposits to qualify for an interest-only mortgage.

Other Factors That Can Affect Your Mortgage

Your Income Sources

Most lenders prefer applicants with full-time jobs and PAYE salaries. If your income source is considered non-standard, like being self-employed, lenders will typically offer you less attractive rates.

Some may even reject your application, and it’s wise to consult a mortgage broker who can connect you to specialised lenders who accept different income types.

Bad Credit

Most mortgage lenders prefer applicants with good credit reports, but having bad credit doesn’t disqualify you from getting approved for a £300k mortgage.

You can get specialist providers who offer mortgages to bad credit borrowers, but they’ll likely feature higher rates and repayments than customers with good credit.

Final Thoughts

An online mortgage calculator can help you calculate your monthly repayments before applying for a £300k mortgage.

However, it’s only a rough idea of what you’re eligible for and not an accurate cost.

For more accuracy and guidance, consult a specialist mortgage broker who can advise you on where to get the best rates no matter your circumstances.

Call us today on 01925 906 210 or contact us. One of our advisors can talk through all of your options with you.

Further reading: 

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