Thinking About Switching from an Interest-Only Mortgage to a Repayment Mortgage? Here’s What to Know

If you currently have an interest-only mortgage, you may be wondering whether it’s time to switch to a repayment mortgage.

As repayment deadlines approach or financial circumstances improve, many homeowners start thinking about switching from interest-only to repayment to ensure their loan is fully cleared by the end of the term.

At Mortgage Bridge, we often help clients explore this change — balancing affordability, long-term goals, and lender requirements.

Here’s what you need to know about how switching works, what it costs, and how it can benefit you.

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What’s the Difference Between Interest-Only and Repayment Mortgages?

Before deciding whether to switch, it’s important to understand how these two mortgage types work.

Interest-Only Mortgage

• You pay only the interest each month.

• The capital balance (the amount borrowed) remains the same.

• You’ll still owe the full loan amount at the end of the term.

• You’ll need a repayment strategy — such as savings, investments, or selling the property — to clear the balance.

Repayment Mortgage

• Each payment covers both interest and capital.

• Over time, the loan balance decreases until it’s fully repaid.

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• You’ll own the property outright at the end of the term.

💡 If your goal is to be mortgage-free at the end of your term, a repayment mortgage is the more reliable route.

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Why Homeowners Switch from Interest-Only to Repayment

There are several common reasons people decide to make the switch:

1. To Ensure the Loan Is Fully Repaid

Some borrowers find their original repayment plan — like an investment policy or endowment — hasn’t performed as expected. Moving to a repayment mortgage ensures your balance reduces each month.

2. For Greater Financial Security

As you near retirement or financial stability improves, it’s reassuring to know your mortgage will eventually be paid off in full.

3. To Reduce Long-Term Interest Costs

Although monthly payments will increase, switching to repayment means you’ll pay less overall interest because the loan balance decreases over time.

4. To Improve Borrowing Options Later

Lenders tend to view repayment mortgages as lower-risk. That can help if you plan to remortgage, release equity, or move in the future.

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Can You Switch from an Interest-Only to a Repayment Mortgage?

Yes — in most cases, you can.

There are two main ways to make the change:

1. Switch with Your Current Lender

You can contact your lender to discuss converting your existing mortgage to repayment. Some lenders will allow a full switch, while others may offer a part-and-part mortgage, where part of the loan remains interest-only and the rest is repayment.

They’ll usually assess:

• Your income and outgoings

• Current loan balance and term

• Affordability based on the higher repayments

If approved, your monthly payments will increase because you’ll now be paying off the loan capital as well as the interest.

2. Remortgage to a New Lender

If your current lender’s terms aren’t suitable, you can remortgage with a new lender and move onto a repayment plan.

This may also be an opportunity to secure a better rate or adjust your term to fit your goals.

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How Much Will Your Payments Increase?

Switching from interest-only to repayment means your monthly payments will rise — but by how much depends on:

• The loan size

• The remaining term

• Your interest rate

For example, if you have a £200,000 mortgage over 20 years at 4.5% interest:

• Interest-only: £750 per month (approx.)

• Repayment: £1,265 per month (approx.)

While that’s a £515 increase, it means your mortgage balance reduces every month — and you’ll eventually own your home outright.

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Can You Switch Part of Your Mortgage?

Yes. Some borrowers prefer a part-and-part mortgage, which combines both repayment and interest-only elements.

For example:

• £150,000 on repayment

• £50,000 on interest-only

This can be a good compromise if you want to reduce your overall balance while keeping monthly costs manageable.

Your broker can help you calculate the best structure based on your goals and affordability.

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What Are the Pros and Cons of Switching?

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How to Switch from Interest-Only to Repayment

Here’s how to prepare and make the process as smooth as possible:

1. Review your current mortgage – Check your outstanding balance, rate, and remaining term.

2. Speak with your lender or broker – Discuss your options and the affordability of switching.

3. Request an illustration – Your lender can show what new payments would look like.

4. Check for fees – Ask about any switch or remortgage fees.

5. Complete the switch or remortgage – Once approved, your payments will automatically adjust to repayment.

💡 Tip: If affordability is a concern, consider shortening the switch — for example, converting part of the mortgage or extending the term slightly to balance monthly costs.

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Example: Successful Switch to Repayment

A Mortgage Bridge client had a £180,000 interest-only mortgage nearing its end, but their investment plan hadn’t grown as expected.

We helped them remortgage to a full repayment deal with a competitive fixed rate. Their payments increased modestly, but they gained peace of mind knowing their loan would now be fully cleared before retirement.

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Final Thoughts

If you’re considering switching from an interest-only mortgage to a repayment mortgage, it’s worth exploring your options sooner rather than later.

Making the change can bring long-term financial security and ensure you’re on track to pay off your home completely.

At Mortgage Bridge, we can assess your current deal, calculate new payments, and guide you through the process — whether you switch with your lender or remortgage to a new one.

If you’d like to see what could work for you, we’re happy to help.