Buy-to-let minimum rent calculator
Estimate the minimum monthly rent a lender may require for a buy-to-let mortgage, based on your target loan amount. The result is based on a typical buy-to-let interest cover ratio, known as an ICR, and a stressed interest rate. It is for guidance only. Actual lender requirements can vary depending on the lender, property, loan-to-value, product type, tax position, rental assessment and your wider circumstances.
This tool provides general information only. It is not a mortgage application, mortgage offer, personalised illustration or regulated mortgage advice. Most buy-to-let mortgages are treated as investment or business lending and are not regulated in the same way as residential mortgages. Some cases may be classed as consumer buy-to-let and receive different protections.
Speak to a Nexpad adviser for buy-to-let mortgage adviceYour home may be repossessed if you do not keep up repayments on your mortgage.
Think carefully before securing other debts against your home. Rental income is not guaranteed. Void periods, repairs, maintenance costs, letting costs and tenant arrears can reduce the income available to meet mortgage payments.
How the rent stress test works
Buy-to-let lenders usually assess rental income using an interest cover ratio, known as an ICR, at a stressed interest rate. This is designed to test whether the expected rent would still cover the mortgage interest if rates were higher than the initial product rate.
As a general guide, lenders often use an ICR of around 125% for basic-rate taxpayers and around 145% for higher-rate taxpayers. Limited company applications, portfolio landlords and different product types may be assessed differently, so the exact calculation will depend on the lender's criteria.
The minimum rent is the amount needed to cover the stressed monthly mortgage interest by the lender's required ICR. If the expected market rent is below that figure, the lender may reduce the loan amount, ask for a larger deposit or decline the application.
How to evidence rental income to a lender
Lenders usually rely on an independent valuer's rental assessment, carried out as part of the mortgage valuation. This gives the lender an opinion of the achievable market rent for the property.
A written rental appraisal from a local letting agent can also be useful before you apply, but the lender will normally rely on the valuation report when making its decision.
Frequently asked questions
What is the minimum rent needed for a buy-to-let mortgage?
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It depends on the loan amount, the lender's interest cover ratio and the stressed interest rate used in the affordability assessment. ICRs of around 125% and 145% are common reference points, but the exact requirement varies by lender, product, applicant type and tax position.
Why do lenders use a stressed interest rate?
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Lenders use a stressed interest rate to check whether the rental income would still be sufficient if interest rates were higher than the initial product rate. This gives the lender a margin of safety when assessing the affordability of the buy-to-let mortgage.
What if the property does not achieve the minimum rent?
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If the expected rent is below the lender's required level, the lender may offer a smaller loan, require a larger deposit or decline the application. Improving the loan-to-value, choosing a different product or using a lender with different criteria may change the outcome.
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