Rental Business Mortgage Relief: Quick Answer for Landlords
For individual residential landlords, rental business mortgage relief generally works through a basic-rate tax reduction rather than by deducting residential mortgage interest directly from rental income. Under the current Section 24 rules, qualifying residential finance costs can generally contribute to a tax reduction calculated at the basic Income Tax rate of 20%. This does not mean landlords receive 20% of their entire mortgage payment back. The rules apply to qualifying finance costs, such as eligible mortgage interest, rather than repayment of the mortgage capital. Different rules can apply where rental property is held through a limited company, because qualifying finance costs are generally dealt with when calculating the company’s taxable property business profits for Corporation Tax purposes.Understanding Rental Business Mortgage Relief for Landlords
Landlords often incur finance costs when purchasing, refinancing or improving rental properties. These costs may include:- Mortgage interest
- Interest on loans used to purchase residential rental property
- Interest on borrowing used to repair or improve a rental property
- Interest on loans used to fund certain property business expenses
- Some mortgage arrangement, guarantee and finance-related fees
Changes to Mortgage Interest Relief
The restriction on residential property finance costs was phased in from 6 April 2017 and became fully effective from 6 April 2020. Under the current rules, most individual landlords cannot deduct residential mortgage interest and other qualifying finance costs from rental income before calculating taxable profit. Instead:- Rental profit is calculated before deducting restricted finance costs.
- The finance costs are identified separately.
- A tax reduction is generally calculated at the basic Income Tax rate of 20%.
- The reduction is applied against the Income Tax due on the property business.
How Rental Business Mortgage Relief Works
For individual residential landlords, rental business mortgage relief generally takes the form of a basic-rate tax reduction on qualifying finance costs rather than a deduction of mortgage interest from rental income. The Basic-Rate tax reduction is generally equal to 20% of the lowest of the following amounts:- Qualifying finance costs for the tax year, including any unused costs brought forward
- Property business profits for the tax year
- Adjusted total income above the Personal Allowance
How Section 24 Changed Landlord Mortgage Interest Tax Relief
| Previous treatment | Current treatment for individual residential landlords | |
|---|---|---|
| Mortgage interest | Could generally be deducted when calculating taxable rental profit | Generally not deducted from rental income before calculating taxable profit |
| Taxable rental profit | Calculated after eligible finance costs | Generally calculated before restricted residential finance costs |
| Tax relief | Effect depended on the landlord’s marginal Income Tax rate | Qualifying finance costs can contribute to a basic-rate tax reduction |
| Higher-rate landlords | Could potentially receive relief at their marginal rate | Finance-cost tax reduction is generally limited to the basic rate |
Simple Example
Does Mortgage Relief Mean 20% of Your Mortgage Payment?
No. The basic-rate tax reduction does not normally apply to your entire mortgage payment. A repayment mortgage usually contains both interest and capital repayment. The capital element is not a finance cost for this relief. For example, if your monthly mortgage payment is £1,200 but only £700 represents qualifying mortgage interest, the relevant finance-cost figure is based on the qualifying £700 interest element, not the full £1,200 payment. The final tax reduction can also be restricted by the statutory calculation, including taxable property business profits and adjusted total income. Any qualifying finance costs that cannot be used immediately may potentially be carried forward under the applicable rules. A landlord receives £24,000 of rental income and has £8,000 of allowable non-finance expenses. The landlord also pays £6,000 of mortgage interest.| Calculation | Amount |
|---|---|
| Rental income | £24,000 |
| Allowable non-finance expenses | £8,000 |
| Taxable rental profit before finance-cost reduction | £16,000 |
| Qualifying mortgage interest | £6,000 |
| Potential basic-rate tax reduction at 20% | £1,200 |
Why Higher-Rate Landlords May Pay More Tax
The current mortgage relief for landlords system can particularly affect taxpayers whose income falls within the higher or additional Income Tax bands. Before the restriction, a higher-rate taxpayer could effectively receive relief at 40% on qualifying mortgage interest because the interest reduced taxable rental profits. Under the current rules, the tax reduction is generally limited to 20%.Higher-Rate Taxpayer Example
A landlord has £20,000 of rental income, £5,000 of non-finance expenses and £8,000 of mortgage interest.- Taxable property profit is £15,000.
- Income Tax at 40% is £6,000.
- The potential finance-cost tax reduction is £1,600.
- The resulting tax after the reduction is £4,400.
Which Landlords Are Affected?
- Individuals who let residential property
- Sole landlords
- Individuals in property partnerships
- Trustees or beneficiaries in some residential property businesses
- Non-resident individuals with UK residential property income
Qualifying Finance Costs
When calculating rental business mortgage relief, it is important to separate qualifying finance costs from mortgage capital repayments and private borrowing.- Interest on a loan used to purchase a residential rental property
- Interest on additional borrowing used for repairs or improvements
- Interest on a loan used to refinance original qualifying borrowing
- Mortgage arrangement fees treated as finance costs
- Loan guarantee fees
- Interest on overdrafts used wholly for the property business
Costs That Do Not Qualify for Mortgage Relief
- Mortgage capital repayments
- Private borrowing costs
- Interest not connected with the property business
- Penalties for late mortgage payments
- Finance costs already relieved elsewhere
Can Refinancing Interest Qualify?
Interest on replacement borrowing may qualify where it replaces an earlier loan used for the property business. Relief can be limited where the refinanced loan exceeds the capital originally introduced into the property business or where additional funds are withdrawn for private use.Example: Refinancing a Buy-to-Let Property
Suppose a landlord originally borrowed £180,000 to acquire a rental property and later refinances the borrowing. Interest on replacement borrowing may still qualify as a finance cost where the refinancing genuinely replaces borrowing used for the property business and remains within the relevant tax rules. If additional borrowing is taken for private expenditure, the interest relating to that private element would not normally become an allowable rental finance cost simply because the loan is secured against the rental property. The purpose and use of the borrowing are therefore important. Keep records showing the original borrowing, refinancing transaction and how any additional funds were used.Mortgage Relief and Jointly Owned Property
Where a property is jointly owned, rental income and finance costs must be allocated between the owners. Married couples and civil partners who live together are generally taxed equally on jointly owned property income unless a valid declaration based on unequal beneficial ownership applies. Each owner applies the tax reduction separately based on their share of rental income, property profit, qualifying finance costs and wider Income Tax position.Mortgage Relief for Limited Companies
Companies are not generally subject to the same residential property finance-cost restriction. A property company can normally deduct qualifying interest and finance expenses when calculating taxable property business profits, subject to Corporation Tax rules and any relevant restrictions. This does not automatically make incorporation more tax-efficient. A full comparison should consider Corporation Tax, tax on extracting profits, Stamp Duty Land Tax, Capital Gains Tax, refinancing costs, borrowing rates, administrative costs and succession planning. Decisions like this are best made as part of a wider strategy to maximise your rental property ROI through effective tax planning, rather than in isolation.Individual Landlord vs Limited Company Mortgage Interest Treatment
| Property ownership | General treatment of qualifying finance costs |
|---|---|
| Individual residential landlord | Residential finance costs are generally restricted under Section 24 and may contribute to a 20% basic-rate tax reduction. |
| Property partnership involving individuals | Residential finance-cost restrictions can apply to the individuals’ property business. |
| Limited company | Qualifying interest and finance expenses are generally dealt with when calculating company profits, subject to Corporation Tax rules and any applicable restrictions. |
Furnished Holiday Lettings and Mortgage Interest
The separate furnished holiday lettings tax regime was abolished from 6 April 2025 for Income Tax and Capital Gains Tax purposes, and from 1 April 2025 for Corporation Tax. Former furnished holiday letting businesses operated by individuals are therefore generally subject to the same residential finance-cost restriction as other residential property businesses from 2025/26 onwards.Mortgage Relief and Property Losses
Property business losses and unused residential finance costs are tracked separately. A landlord may therefore carry forward both a property loss balance and an unused finance-cost balance, with each subject to different rules.Effect on Adjusted Net Income
Because residential mortgage interest is no longer deducted when calculating taxable rental profits, adjusted net income can be higher than under the old system. This can affect the Personal Allowance taper, High Income Child Benefit Charge, tax-free childcare eligibility, savings tax and pension planning.Reporting Rental Business Mortgage Relief on Self Assessment
Individual landlords normally claim rental business mortgage relief through the property section of their Self Assessment tax return, using the appropriate residential finance-cost figures.Individual landlords should distinguish rental income, allowable non-finance expenses, residential finance costs, unused finance costs brought forward and property losses brought forward. Entering mortgage interest as an ordinary deductible expense can understate taxable property profit and produce an incorrect return. Annual mortgage statements should be used because monthly repayments usually include both interest and capital.How to Claim Landlord Mortgage Interest Tax Relief
Individual landlords normally report their rental income, allowable property expenses and residential finance costs through the property section of their Self Assessment tax return.- Calculate your total rental income for the tax year.
- Identify allowable property expenses that remain deductible from rental income.
- Separate qualifying residential finance costs from capital mortgage repayments and private borrowing costs.
- Report the relevant residential finance costs in the appropriate part of the property return.
- Keep records supporting the interest and finance-cost figures used.
- Track any unused residential finance costs carried forward for future tax years.
What Happens to Unused Mortgage Finance Costs?
If the full basic-rate tax reduction cannot be used in a tax year because of the statutory limits, qualifying unused residential finance costs can generally be carried forward to a later year for the same property business. Carry forward does not mean that the unused interest becomes an ordinary deductible expense in the following year. It remains subject to the residential finance-cost tax-reduction rules when it is considered in a later period. Keeping a year-by-year schedule of unused finance costs is therefore important, particularly for landlords whose rental profits or taxable income fluctuate.Records Landlords Should Keep
- Annual mortgage interest statements
- Loan and refinancing agreements
- Mortgage completion statements
- Bank statements
- Finance fee invoices
- Evidence showing how borrowed funds were used
- Rental income and property expense records
- Schedules of unused finance costs carried forward
Common Mortgage Relief Mistakes
- Deducting residential mortgage interest directly from rental income
- Claiming relief for mortgage capital repayments
- Using total monthly repayments instead of the interest figure
- Assuming relief always equals 20% of all finance costs
- Ignoring the property profit and adjusted income restrictions
- Failing to carry forward unused finance costs
- Claiming interest on borrowing used privately
- Applying company tax treatment to an individually owned property
Is There a Mortgage Relief Program for Landlords?
There is no general HMRC mortgage relief program that reimburses buy-to-let mortgage payments. The relevant tax provision is the basic-rate reduction for qualifying residential property finance costs. Landlords experiencing difficulty paying a mortgage should contact their lender directly. Lender support, refinancing and forbearance arrangements are separate from the tax rules. When landlords search for “mortgage relief”, they may therefore be referring to two different things: tax relief on qualifying rental finance costs, or financial support from a mortgage lender when repayments become difficult. This article deals primarily with the tax treatment of mortgage and finance costs for a rental property business.Final Guidance on Rental Business Mortgage Relief
Correctly calculating rental business mortgage relief requires landlords to distinguish qualifying finance costs from capital repayments and other non-qualifying expenditure. Mortgage relief for individual residential landlords is generally provided as a 20% basic-rate tax reduction rather than a direct deduction from rental income. The result depends on qualifying finance costs, property profits, adjusted total income and the landlord’s wider tax position. Accurate records and separate tracking of unused finance costs are therefore essential.Mortgage Relief for Landlords Case Study
David, an individual landlord, visited our Wimbledon office after noticing that his Self Assessment tax bill had increased despite paying substantial mortgage interest on his rental property. He assumed his mortgage interest could still be deducted from his rental income, but he was unsure how the current mortgage relief for landlords rules applied or whether he was claiming the correct tax relief.
After reviewing David’s rental accounts, mortgage statements and finance costs, we explained how mortgage relief UK rules now operate for individual residential landlords. We clarified that qualifying mortgage interest is no longer deducted from rental income when calculating taxable profits. Instead, eligible finance costs are generally used to calculate a 20% basic-rate tax reduction, subject to HMRC’s statutory limits. We also checked whether any unused finance costs could be carried forward and reviewed how the revised rules affected his overall Income Tax position as a higher-rate taxpayer.
During the consultation, we highlighted common mistakes, such as claiming capital repayments instead of mortgage interest or using total monthly mortgage payments rather than the interest element shown on annual mortgage statements. We also discussed the importance of maintaining accurate records to support future HMRC reporting.
By the end of the meeting, David understood how to claim mortgage relief for landlords correctly, maintain accurate rental records and ensure his property tax affairs remained fully compliant with HMRC requirements.
