Interest-Only Mortgages
With an interest-only mortgage, the scheduled monthly payment normally covers interest rather than repaying the capital borrowed. A clearly understood, credible strategy is needed to repay the remaining capital by the end of the mortgage term.
What Is an Interest-Only Mortgage?
A mortgage balance consists of the capital borrowed and the interest charged by the lender. With a standard repayment mortgage, scheduled monthly payments normally include both interest and part of the capital. With an interest-only mortgage, scheduled payments normally cover the interest, while the capital is due separately.
Unless capital is repaid through overpayments or a part-and-part arrangement, the amount originally borrowed can remain outstanding throughout the term. The remaining balance must be repaid by the contractual end date.
For a regulated residential interest-only mortgage, the lender will require evidence of a clearly understood and credible repayment strategy that has the potential to repay the capital. The strategy must meet that lender's criteria and cannot simply depend on an uncertain windfall or an assumption that property prices will rise.
Paying the monthly interest does not normally repay the capital borrowed.
Interest-Only and Repayment Mortgages Compared
This is a general illustration, not a personalised cost comparison or recommendation.
Repayment Mortgage
-
1
Monthly payment
-
2
Interest plus part of the capital
-
3
Balance generally reduces over time
-
4
Mortgage should be repaid at the end if payments are maintained
Interest-Only Mortgage
-
1
Monthly interest payment plus a separate repayment strategy or capital payments
-
2
Capital may remain outstanding
-
3
Remaining balance must be repaid at the end
An interest-only monthly payment may be lower than a repayment-mortgage payment using the same balance, rate and term because it does not include scheduled capital repayment. However, the cost of maintaining the separate repayment strategy must also be considered, and more total interest may be paid because the balance may not reduce.
This is a general illustration, not a personalised cost comparison or recommendation.
Compare Repayment vs Interest-Only Figures
See side-by-side monthly payments and the difference in total interest over your term with our interactive calculator.
Different Interest-Only Contexts
The term "interest-only" can appear in several mortgage contexts. The rules, affordability assessment and repayment strategy are not identical in every case.
Residential Interest-Only
A regulated mortgage on a main home where some or all of the capital is due separately. The lender will assess affordability and the repayment strategy under its current criteria.
Part-and-Part Mortgage
Part of the borrowing is on repayment and part is interest-only. Scheduled payments reduce the repayment portion, while a strategy is still needed for the interest-only balance.
Buy-to-Let Interest-Only
Interest-only is used in some buy-to-let lending, but buy-to-let criteria, rental assessment, tax position and regulatory treatment can differ from a residential mortgage.
Retirement Interest-Only
A retirement interest-only mortgage is a distinct regulated product. Interest is normally paid monthly, while the capital is commonly repaid after a specified life event such as sale of the home, death or a move into long-term care, according to the product terms.
Why the Repayment Strategy Matters
The borrower is responsible for putting in place and maintaining a credible strategy to repay the capital. The lender will assess whether the proposed strategy has the potential to repay the amount due, but that assessment is not a guarantee that the strategy will succeed.
Examples that a lender may consider, depending on its criteria and the circumstances, can include regular savings or investments, periodic capital repayments from income, or the sale of another asset or property. A lender may apply discounts to projected values, require minimum amounts or reject a strategy accepted elsewhere.
An expected but uncertain inheritance, bonus or increase in the mortgaged property's value should not be presented as a dependable repayment strategy. The sale of the main home may require the lender to consider whether enough equity would remain for suitable alternative accommodation.
Repayment-Strategy Checklist
- What amount will remain due at the end of the term?
- What strategy is intended to repay it?
- Does the lender accept that strategy?
- What evidence and minimum value does the lender require?
- What assumptions does the strategy rely on?
- How often will progress be reviewed?
- What happens if the value or expected proceeds fall short?
- Is there enough time to change course if needed?
Reviewing the Plan During the Mortgage Term
A repayment strategy should not be set once and ignored. Investment values, savings progress, pension expectations, property plans and personal circumstances can change over a long mortgage term.
For many regulated interest-only mortgages, the lender is required to carry out at least one review during the term to check that the strategy remains in place and still appears capable of repaying the capital. The borrower remains responsible for monitoring the strategy and responding to any shortfall.
Useful review points include checking the current mortgage balance, the contractual end date, the latest value or progress of the strategy, and whether the assumptions remain realistic. If the plan appears off track, contacting the lender early can leave more time to consider possible actions.
Review Cycle
-
1
Check the balance and end date
-
2
Review the repayment strategy's current position
-
3
Compare the expected proceeds with the amount due
-
4
Act early if there may be a shortfall
What Happens at the End of the Term?
The remaining capital becomes due under the mortgage contract. It is not written off merely because all monthly interest payments have been made.
If the repayment strategy is sufficient, its proceeds can be used to repay the balance. If there is or may be a shortfall, contact the lender as early as possible. Waiting until the contractual end date can reduce the time available to consider alternatives.
Depending on the circumstances and lender criteria, possible discussions might include making capital payments, switching some or all of the mortgage to repayment, using other assets, selling the property, or requesting a term change. None of these routes is guaranteed, and a new mortgage or extension will normally require assessment and approval.
If the capital cannot be repaid when due and no alternative is agreed, the property may need to be sold and the lender may ultimately take possession action.
Potential Features and Important Risks
Potential Features
-
Lower scheduled mortgage payment
Using the same balance, rate and term, an interest-only payment will normally be lower than a repayment payment because scheduled capital repayment is excluded.
-
Part-and-part structures may be available
Some products allow part of the mortgage to repay capital monthly while the remainder is interest-only.
-
Capital payments may be possible
Some products allow overpayments, subject to the mortgage terms and any early repayment charge.
Important Risks and Costs
-
Capital remains due
The remaining interest-only balance must be repaid at the end of the term.
-
The strategy may underperform
Savings, investments, pensions or asset values may not produce the expected amount.
-
Separate strategy costs matter
A lower mortgage payment does not include contributions or costs needed to build the repayment fund.
-
More interest may be paid
If the capital balance does not reduce, interest continues to be charged on a larger balance than under an equivalent repayment mortgage.
-
Future borrowing is not guaranteed
A term extension, remortgage or later-life product will depend on future criteria and circumstances.
-
The home may need to be sold
If the capital cannot otherwise be repaid, sale of the property may be required.
What Should You Check?
An interest-only mortgage needs to be considered alongside the repayment strategy, product terms and future plans—not only the monthly mortgage payment.
- How much of the mortgage is interest-only
- The current balance and contractual end date
- The proposed repayment strategy
- Whether the lender accepts that strategy
- Evidence and minimum values required
- Assumptions, risks and review frequency
- The cost of maintaining the repayment strategy
- The interest rate, fees and APRC
- Overpayment allowances and ERCs
- The effect of rate changes if the rate is variable
- Whether part-and-part or repayment alternatives are being considered
- What happens if the strategy falls short
- The housing implications of any plan to sell or downsize
- Affordability now and later in the term
This page provides general information only. If you submit an enquiry, it will be passed to Anderson Reed, whose qualified, FCA-authorised advisers may contact you and provide any regulated mortgage advice.
Frequently Asked Questions
These answers explain interest-only mortgages in general. A lender's current criteria and the individual mortgage terms determine which repayment strategies, limits and options apply.
Does an interest-only payment reduce the mortgage balance?
Not normally. The scheduled monthly payment generally covers the interest charged rather than repaying the capital. The balance may reduce if capital overpayments are made or part of the mortgage is on a repayment basis.
The remaining interest-only balance is due by the contractual end date, so a separate credible repayment strategy is required.
Are interest-only monthly payments always lower?
Using the same mortgage balance, interest rate and term, the scheduled interest-only payment will normally be lower than a repayment payment because it excludes scheduled capital repayment.
That is not a complete cost comparison. Contributions to the repayment strategy, product fees, interest over the term and the risk of a capital shortfall must also be considered.
What repayment strategies might a lender consider?
Depending on the lender and circumstances, examples may include regular savings or investments, periodic capital repayments from income, or sale of another asset or property.
There is no universal accepted list. Lenders can apply different evidence, value, ownership and risk requirements, and acceptance does not guarantee the strategy's future performance.
Can I rely on an inheritance or rising property prices?
An expected but uncertain inheritance should not be treated as a dependable repayment strategy. FCA rules also restrict reliance on an assumption that the mortgaged property's value will rise enough to repay the loan.
If sale of the main home or downsizing is proposed, the lender may need to consider the available equity and whether suitable alternative accommodation would remain affordable.
Can I switch from interest-only to repayment?
It may be possible to switch all or part of the mortgage to repayment, subject to the lender's terms, affordability assessment and approval. The monthly payment would normally increase because capital would also be repaid.
Making the change earlier can spread capital repayment over more time, but it should not be presented as an automatic right with every lender.
What is a part-and-part mortgage?
A part-and-part mortgage places some borrowing on repayment and some on interest-only. The repayment portion reduces through scheduled payments, while a strategy is still needed for the interest-only balance.
The split, affordability assessment and accepted repayment strategy depend on the lender and circumstances.
What loan-to-value is available for interest-only?
There is no single LTV limit across all lenders or interest-only contexts. Residential, part-and-part, buy-to-let and retirement interest-only products can use different maximums and minimum equity requirements.
Lender criteria can also depend on income, property, age, repayment strategy and other factors. Avoid relying on a generic percentage before checking current criteria.
What if my repayment strategy is falling short?
Review the current balance, end date and expected proceeds, then contact the lender as early as possible. More time can create more scope to discuss capital payments, a repayment conversion, a term change, use of other assets or sale of the property.
The available routes depend on affordability, lender criteria and the circumstances. None should be assumed to be available automatically.
What happens if I cannot repay the capital at the end?
The capital remains contractually due. Contact the lender promptly rather than waiting for the end date. The lender should discuss the circumstances and any options it is able to consider.
If the balance cannot be repaid and no alternative is agreed, the property may need to be sold and the lender may ultimately seek possession.
Is buy-to-let interest-only the same as residential interest-only?
No. Both can use interest-only payments, but buy-to-let lending may use rental-income assessment, business-purpose rules and different repayment-strategy or property criteria.
A statement that applies to a buy-to-let product should not automatically be applied to a regulated residential mortgage.
Is retirement interest-only the same as a lifetime mortgage?
No. A retirement interest-only mortgage normally requires monthly interest payments and repays the capital after a specified event according to its terms. A lifetime mortgage commonly allows interest to roll up, although options vary.
Both are distinct from an ordinary residential interest-only mortgage and require separate eligibility, affordability and advice considerations.
Will the lender check my repayment strategy during the term?
For many regulated interest-only mortgages entered into under current rules, the lender must carry out at least one review during the term to check that the strategy is still in place and appears capable of repaying the capital.
The borrower remains responsible for maintaining and monitoring the strategy rather than waiting for the lender's review.
Make an Interest-Only Mortgage Enquiry
Share your contact details and we will pass your enquiry to our partner Anderson Reed. One of their qualified, FCA-authorised advisers may then contact you to discuss your circumstances and any mortgage options that may be relevant.
-
1
Send your details
The form takes only a moment and does not commit you to applying for a mortgage.
-
2
We introduce you to our partner
Your enquiry is passed to Anderson Reed, the FCA-authorised firm named in our disclosure.
-
3
A partner adviser may contact you
They can ask about your circumstances, repayment strategy and provide any regulated mortgage advice.
- Free initial conversation
- No obligation
- Passed to our partner Anderson Reed
- Any mortgage advice is provided by their qualified, FCA-authorised advisers
- Your details are handled securely
Interest only Enquiry
Complete the form below and your enquiry will be passed to our partner Anderson Reed, whose qualified, FCA-authorised advisers will be in touch to discuss your options — completely free of charge.
No obligation. Your enquiry is passed to our partner Anderson Reed, whose qualified, FCA-authorised advisers will be in touch. Your data is secure.