What Monthly Repayments On £300K Mortgage Can I Expect?

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Your mortgage repayments on a £300,000 mortgage will vary depending on things like your mortgage type, interest rate, and mortgage term. Each mortgage deal will differ from another, meaning your monthly repayments will vary depending on the deal you agree to. Comparing the best deals is the key to finding a mortgage with monthly payments you can comfortably afford.

Mortgage lenders set their own eligibility criteria to determine your affordability, but most will rely on income requirements and spending habits, and conduct a financial stress test to get a better understanding of your ability to make your monthly repayments on time and reliably.

We’ll cover all this below and provide you with some examples based on different deals so you can understand better whether a 300K mortgage is right for you.

*All figures marked with ~ throughout the article are accurate estimates, although final repayment amounts won’t always be the same if you apply for a similar deal due to changing interest rates and mortgage deals.

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Can I Afford The Monthly Payments On A £300,000 Mortgage?

Mortgage lenders will ultimately determine your affordability. But you can increase your chance of a successful mortgage application if you consider your annual income and spending habits to ensure a £300,000 mortgage is right for you.

Two main things are considered when you apply for a mortgage:

  • Income and Spending Habits
  • Finance Stress Test

Income and Spending Habits

By considering your annual income, how much you earn each month, and how much you spend (and also, what you spend your money on) a mortgage lender can get a good idea about your financial life and the mortgage deal that may be best for you.

Usually lenders will scrutinise your income and outgoings for the 3 months prior to your application, as well as other factors that are a little broader, such as your credit history and debt to income ratio, etc, over time.

If they think you can make the monthly repayment based on the information they gather, then you’ll be one step closer to being approved.

Finance Stress Test

The final thing that will determine your affordability is the lender’s finance stress test, designed to check your affordability should there be a significant change in your circumstances during the course of your mortgage. Examples include:

  • household income changes
  • your family growing
  • an occupation change


This will give the lender a better idea about your ability to make the monthly repayments reliably should things change for you. Taking this step protects both you as the borrower, and the lender, and passing this comfortably can lead to more competitive rates being offered as you’re seen as a lower risk borrower.

What If I Have A Poor Credit History?

If you have bad credit, you can still be approved for a mortgage. You will, however, need to think carefully about how you find and approach mortgage lenders who are more willing to lend to individuals with a worse credit history than expected.

To access the best deal for individuals with bad credit, you’ll almost certainly have to work with a specialist mortgage broker who has connections to lenders that are more willing to consider individuals without an ideal credit history.

These lenders won’t typically be found on the high street as with more traditional mortgages. By using a mortgage broker, you’ll be able to access these lenders more easily and you’ll benefit from their understanding of the mortgage market, further increasing your chance of a successful application.

When The Bank Says No is a specialist mortgage broker that can help you find the right mortgage for your circumstances, no matter your credit history. Work with us today to find a mortgage that works for you.

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What Factors Affect How Much I Pay Each Month Towards My Mortgage UK?

There are really four key things that will influence your monthly repayments on a mortgage:

  • the interest rate
  • the length of your mortgage term
  • the type of mortgage you’re on
  • how much deposit you put towards the property value

How Does Interest Rate Affect Repayments?

Different people will be on different mortgage deals and those deals will have different interest rates. If you sign up to your lender’s standard variable rate mortgage deal, then you will notice that each month the payment you make towards the interest rate charges of your mortgage payments will fluctuate according to the base rate at the Bank of England at the time.

This is good for borrowers when interest rates are low, but should the interest rate rise higher or quicker than expected, it can leave those on variable rate mortgages feeling a little insecure and scrambling to afford their higher payments.

Plenty of borrowers opt for fixed rate mortgages instead. Here, your interest rate is locked in for an initial rate period of between 2 and 10 years typically. That means even when the base interest rate changes, you’ll still pay interest at the rate you locked in at when first fixing.

This is good for borrowers who want to guarantee their mortgage payment each month, but should the base interest rate fall, you won’t benefit from reduced monthly repayments, so bear this in mind.

Finding a deal with the best interest rate is important, because it will have a significant impact on the amount you pay each month.

How Mortgage Terms Affect Repayments

Your mortgage term is the amount of time you take your mortgage loan out over. The longer the loan, the more time you have to repay what you’ve borrowed, so the smaller your monthly repayments will be. If you borrow over a shorter period of time you’ll notice higher monthly repayments as you’ll have to contribute more in a shorter time period to cover the full amount you’ve borrowed much sooner.

There are pros and cons to both, which we’ll illustrate with an example of how the length of your mortgage can directly impact how much you spend each month (and how much you’ll pay back when factoring in the total cost of interest rate charges).

If you take out a £300,000 repayment mortgage with an interest rate of 3.5% over 20 vs 30 years, you’ll still notice a big difference in how much you pay each month and overall:

  • 20 Year Deal: ~£1740 per month (with a total repayment cost of £417,690)
  • 30 Year Deal: ~£1348 per month (with a total repayment cost of £485,161)


If you’re able to afford slightly higher payments each month, then you’ll save in terms of how much you repay over the course of your deal thanks to the interest rate charges you’ll avoid by repaying your mortgage quicker.

Find the mortgage deal that allows you to keep your monthly repayments at a manageable level whilst also paying what you borrow back quick enough to avoid paying too much in interest payments, and you’ll enjoy the perfect balance.

Work with our team at When The Bank Says No to find the right deal on your mortgage for you.

How Do Mortgage Types Affect Repayments?

The two broadest categories of mortgage are:

  • repayment mortgages
  • interest only mortgages

Repayment Mortgage Explained

A repayment mortgage is the typical mortgage all of us are placed on when we take out a mortgage loan. There are different types of repayment mortgages, but they all involve you making two payments each month towards your mortgage:

  • capital (repaying what you’ve actually borrowed)
  • interest (covering the interest costs of your loan)


This type of mortgage will result in higher monthly repayments because you’ll be covering both what you’ve borrowed and the interest costs associated with your loan too.

Interest Only Mortgage Explained

Most mortgage lenders nowadays will only offer residential interest only mortgages to borrowers that are already on a repayment mortgage with them as a temporary measure to help them should their personal circumstances change and they’re no longer able to cover their loan repayments as before.

Mortgage providers will usually allow you to switch to an interest only mortgage for a small amount of time whilst you find a solution to the change in your life (such as being made redundant). Here you will have lower monthly repayments on your 300K mortgage, but you will be repaying over an extended period so you’ll ultimately end up paying more in interest over the course of your mortgage if you do have to switch to interest only.

As soon as you’re able to make capital repayments again, you will be moved back to your typical mortgage with this mortgage type.

How Your Deposit Affects Monthly Repayments

The larger your deposit, the less you’ll have to borrow, and the smaller your monthly repayments will be. Of course, that’s easier said than done for many people, but if it’s possible for you to put even slightly more down against the value of your property then you’ll benefit each month from a lower payment.

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What Is The Best Way To Work Out Monthly Repayments On A £300,000 Mortgage In The UK?

The best way to find out an accurate estimate for the amount you’ll pay each month for your mortgage is to use a mortgage calculator.

Make sure the calculator is UK based as it’ll have the most relevant information to you. You can try to work out the monthly repayment costs yourself, but the calculation isn’t as straightforward as you would assume and with larger numbers – such as for a 300K mortgage – so it’s often just easier to opt for an online calculator that can provide you with an accurate estimate.

There’s no need to wait for somebody to get in touch with a quote either, the calculator you use will provide you with accurate figures instantly. And the only information you’ll need is:

  • the amount you’re borrowing
  • how long you’re borrowing for
  • the type of mortgage
  • your interest rate deal
  • any additional mortgage fees

How Much Will I Pay Each Month For A £300,000 Mortgage In The UK?

Likely Monthly Payments On A £300,000 Mortgage By Varying Interest Rates And Mortgage Type (All Figures Given Are Accurate Estimates Only ~)
Interest Rates
Mortgage Type Mortgage Term 2.5% 3.5% 4.5% 5.5%
Repayment 5 Years £5324 £5458 £5592 £5730
10 Years £2828 £2967 £3109 £3256
15 Years £2001 £2145 £2294 £2451
20 Years £1590 £1740 £1897 £2064
25 Years £1346 £1502 £1667 £1842
30 Years £1186 £1348 £1519 £1703
Interest Only ALL £625 £876 £1124 £1375

Repayments On A 300K Mortgage Summary

Your monthly mortgage repayments will vary depending on your specific deal as shown in the table above. That’s what makes finding the perfect deal difficult for so many mortgage customers.

With the help of a mortgage broker, though, you can find a mortgage with mortgage repayments each month that are manageable, improve your chance of getting your mortgage approved, and find a deal with interest payments, a mortgage amount, and additional monthly costs that work for you.

At When The Bank Says No, we can support even those with poor credit scores secure the perfect mortgage for them.

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Emma Jones
Emma Jones
Emma began her career in Lloyds Banking Group, first in the unsecured & secured loans department at Halifax and later as a mortgage advisor at Lloyds. During 9 years in these roles and a further 2 years at Yorkshire Building Society, Emma was able to observe the impact of the recession, and how the banks let their customers down by denying loans and mortgages. Wanting to be a driving force for change, she stepped into a market advice role where she has been able to help clients when others couldn’t. Identifying a gap in the mortgage space, Emma went on to establish When the Bank Says No. As a keen property investor, she has been the focus of features in publications including The Sunday Times and This is Money. Emma’s greatest joy is overcoming the low expectations of their customers, many of whom have all but given up on getting a mortgage due. One thing Emma has learned through her own personal struggles is every client must be treated like a human and understood better by advisors and lenders in the industry. “We all have to navigate life events which can ultimately impact your financial status. It shouldn’t mean dreams of homeownership or business growth should have the breaks applied”. Emma and her team’s passion for helping people overcome the challenges they may face when applying for a mortgage have fuelled the success of When the Bank Says No.