Written by Mark Langshaw Reviewed by Lee Trett
Sources
21 July 2026
Lowest rate is currently 3.99% - 2 years tracker interest only mortgage at 60% LTV
16 July 2026
Lowest rate is currently 3.96% - 26 months tracker interest only mortgage at 60% LTV
7 July 2026
Lowest rate is currently 3.96% - 27 months tracker interest only mortgage at 60% LTV
19 June 2026
Lowest rate is currently 3.96% - 25 months tracker interest only mortgage at 60% LTV
6 May 2026
Lowest rate is currently 3.96% - 2 years tracker interest only mortgage at 75% LTV
21 December 2023
First Published
Taking out a £400,000 mortgage is a major life event, so it pays to do some research and run a few calculations before you apply. Here you will learn how to work out what the repayments will be on a mortgage of this amount, ways you can reduce them and how our expert brokers can help you do it.
What are the average repayments on a £400k mortgage?
The average monthly repayments on a £400,000 mortgage are £2,111. This means that you would have repaid approximately £633,404 by the end of the term. This is based on current market conditions, with typical mortgage rates at roughly 4% and the average term length being 25 years.
These figures are what is typical based on the market right now, but the exact amount you will repay monthly and overall will vary based on the factors below:
- Term length
- Interest rate
- Mortgage repayment type
- Mortgage product type
We cover how these variables can impact your mortgage costs in more detail later on, but you can head to the next section to carry out some calculations yourself.
How to calculate your mortgage repayments
User our repayment calculator below to get some quick results showing what the repayments on a £400k mortgage will look like. You can also use this tool to compare different rates and terms, as well as convert the results into interest-only.
What factors could affect your repayments?
Here we will explore the factors that determine what your exact repayments will be on a £400,000 mortgage. The tables below contain example calculations for context.
Term length
Longer and shorter term lengths than the standard 25 years are available. Lengthier terms come with lower monthly repayments but will cost you more in interest overall.
The table below shows how different term lengths affect the repayments on a £400k capital repayment mortgage, using a 4% interest rate for example purposes.
|
Mortgage Amount |
Term Length |
Monthly Repayments |
Overall Repayment |
| £400k | 10 years | £4,050 | £485,977 |
|
£400k |
15 years |
£2,959 |
£532,575 |
|
£400k |
20 years |
£2,424 |
£581,741 |
|
£400k |
25 years |
£2,111 |
£633,404 |
|
£400k |
30 years |
£1,910 |
£687,478 |
|
£400k |
35 years |
£1,771 |
£743,862 |
|
£400k |
40 years |
£1,672 |
£802,442 |
Interest rate
Factors including how much deposit you have and your credit situation will determine your interest rate. The table below shows how different rates can affect the monthly repayments on a £400,000 capital repayment mortgage, using a 25-year term length for example purposes.
|
Mortgage Amount |
Interest Rate |
Monthly Repayments |
Overall Repayment |
|
£400k |
3.5% |
£2,002 |
£600,748 |
|
£400k |
4% |
£2,111 |
£633,404 |
|
£400k |
4.5% |
£2,223 |
£666,999 |
|
£400k |
5% |
£2,338 |
£701,508 |
|
£400k |
5.5% |
£2,456 |
£736,905 |
|
£400k |
6% |
£2,577 |
£773,162 |
Mortgage type
Your monthly repayments will also come down to the type of mortgage you select. There are two main areas where you will have a choice on this: the repayment type and the product type.
Product type
Fixed-rate mortgages are the most common type in the UK. Your interest payments will be consistently the same during an introductory rates period (usually 2-5 years, but sometimes longer) before reverting to the lender’s standard variable rate (SVR), which is usually higher.
The most common alternative is a type of variable rate agreement called a tracker mortgage. With this product type, your interest charges can change from one period to the next as these mortgages are tied to an external marker, such as the Bank of England’s base rate.
Repayment type
How much you will pay in interest on your £400,000 mortgage will also come down to the repayment type. Capital repayment, which involves repaying some of the mortgage debt plus interest each month for the duration of the agreed term is the most common type.
A popular alternative is an interest-only mortgage. With this repayment type, only interest payments are mandatory each month and the debt itself is cleared at the end of the term using a pre-approved repayment vehicle, such as investments or the sale of the property.
The table below shows what the repayments on a £400k interest-only mortgage will look like based on a range of different rates and an example term length of 25 years.
|
Mortgage Amount |
Interest Rate |
Interest-only Payments (Monthly) |
Overall Repayment |
|
£400k |
3.5% |
£1,167 |
£750,000 |
|
£400k |
4% |
£1,333 |
£800,000 |
|
£400k |
4.5% |
£1,500 |
£850,000 |
|
£400k |
5% |
£1,667 |
£900,000 |
|
£400k |
5.5% |
£1,833 |
£950,000 |
|
£400k |
6% |
£2,000 |
£1,000,000 |
Mortgage Overpayments
Making regular overpayments on your mortgage can help you reduce your repayment term, as well as the overall interest you'll pay over the length of the mortgage. The table below shows how this would impact a £400,000 mortgage.
| Monthly Overpayment | New Monthly Total | Time Saved off Mortgage | Total Interest Paid | Total Interest Saving |
| £0 | £2,223.33 | 0 months | £266,999 | £0 |
| £50 | £2,273.33 | 11 months | £256,120 | £10,879 |
| £100 | £2,323.33 | 1 year, 10 months | £245,885 | £21,114 |
| £200 | £2,423.33 | 3 years, 6 months | £227,330 | £39,669 |
| £300 | £2,523.33 | 4 years, 11 months | £211,215 | £55,784 |
| £500 | £2,723.33 | 7 years, 5 months | £184,622 | £82,377 |
| £750 | £2,973.33 | 9 years, 11 months | £158,805 | £108,194 |
| £1,000 | £3,223.33 | 11 years, 11 months | £139,120 |
You can use our mortgage overpayments calculator to work out how much you would save with different sized overpayments.
Calculations all done? Secure your mortgage today
Comparing similar mortgage amounts
If £400k is just an estimate of the amount you need to borrow, take a look at the table below to see how the repayments could vary if you were to borrow a similar figure in this ballpark.
These calculations are for a repayment mortgage with a rate of 5% taken over 25 years.
|
Mortgage Amount |
Monthly Repayments |
Overall Repayments |
|
£375k |
£1,979 |
£593,816 |
|
£400k |
£2,111 |
£633,404 |
|
£425k |
£2,243 |
£672,992 |
|
£450k |
£2,375 |
£712,580 |
|
£475k |
£2,507 |
£752,167 |
|
£500k |
£2,639 |
£791,755 |
How much do you need to earn for a £400k mortgage?
All of the mortgage applicants would need a combined salary of somewhere in the £90k to £100k bracket to afford a mortgage of this amount as most lenders will cap your maximum borrowing at between 4 and 4.5 times annual salary. Other lenders will stretch to 5 times income or even 6 times income, so you may have options if you earn less than this figure.
You can use our mortgage affordability calculator below to work out whether you earn enough income for a mortgage of this amount:
Compare £400K mortgage rates online
You can compare the latest rates on £400,000 mortgages using our free mortgage sourcing tool below. We have set this tool to display results for a 60% LTV (40% deposit) mortgage by default but you can manually change this by altering the mortgage amount and property value to match your personal circumstances. More options are available via the filters menu in the bottom left.
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Representative example
A repayment mortgage of over year, APR %. Total payable (incl. product fees of ). Repayments: months at (%), then months at (%, variable). Early repayment charges apply. Rates not guaranteed.
About these rates
Rates shown are illustrative based on the property value, mortgage amount, and term you entered above. Actual rates and total cost depend on your credit profile, deposit, and lender assessment. APR figures include product fees where applicable. Early repayment charges may apply. Rates are not guaranteed and may change before you apply - speak to an adviser to confirm what's available to you today. For a per-product representative example, open Show full details on any card above.
How we can help you reduce your repayments
If you choose to source your £400k mortgage for free through Money Helpdesk, we have whole-of-market brokers on hand to help you reduce your the repayments by doing the following:
- Making sure you get the best interest rate possible
- Suggesting ways to improve your credit score to ensure this
- Advising you on the right term length for your needs
- Recommending the ideal product type for your circumstances
The key to securing the lowest mortgage repayments is to secure the most favourable rate available and choosing the right deal for you. A broker is ideally placed to help you achieve this, thanks to their knowledge, experience and lender contacts across the whole market.
Why choose Money Helpdesk for your mortgage needs?
The possibility of securing a lower interest rate is just one of the reasons to apply for your £400,000 mortgage and access expert broker support through Money Helpdesk.
Here are some of the other benefits to choosing our service:
- We can access exclusive rates and deals
- Our brokers are 5-star rated on leading review websites
- They can secure you a mortgage in principle in minutes
- It takes just minutes to choose a rate online
Ready to get started? You can take advantage of a free- no-obligation chat with a mortgage broker by making an enquiry with us today.
FAQs
Mortgages of £400k or more tend to come with additional fees that you need to factor into your budget. They include:
- Product fees: Can range between nothing and £2,000. Fee-free deals often come with higher rates, but the fee itself can sometimes be added to the mortgage.
- Valuation fee: Some lenders will expect you to foot the cost of having the property you’re buying valued, and this can set you back between £250-1,500.
- Legal fees: Can range from a few hundred to several thousand pounds.
- Stamp duty: See our stamp duty guide to find out how much your bill will be and whether you qualify for exemption.
- Admin costs: This includes the booking fee, telegraphic transfer fee and the account fee. All in all, admin costs for a mortgage application can cost around £1,000.
In most cases you will need a minimum of 5% of the property's value to get a £400k mortgage. Deposit and loan-to-value requirements are based purely on the property's purcahse price, regardless of the mortgage amount.
If the property you are buying has is valued at £400k, you will typically need between £20,000 and £40,000 to put down as a deposit. This means you will need a mortgage of between £380k and £360k, which could cost roughly between £2,221 and £2,105 per month based on average interest rates at the time of writing and the standard term length of 25 years.
A longer term reduces your monthly commitment, which can help with affordability assessments. However, it significantly increases the total interest paid. For example, a £400k mortgage at 4.5% costs £114,000 more in total interest over 35 years compared to 25 years.
You could also consider part and part repayments, where you pay some of your balance as a standard repayment mortgage and some as interest-only. Our part and part repayment calculator can help you to see how this would benefit you.