ICR & Top Slicing
Interest Cover Ratio is the calculation that decides whether a buy-to-let application stands or falls, and it trips up more applicants than almost any other single factor – including experienced landlords who assumed a good property would simply pass.
We help expat clients navigate ICR shortfalls regularly, using top slicing where it applies, and have done since 2008 from our offices in the UK, Hong Kong and Kuala Lumpur.
How ICR actually works
Lenders want the rental income to cover the mortgage payment by a comfortable margin – typically 125% for basic-rate taxpayers and closer to 145% for higher-rate taxpayers, calculated against a stressed interest rate rather than your actual pay rate. That stress rate is often higher than what you’ll really be paying, which is precisely why properties that look affordable on paper can still fail the calculation.
A property renting for £1,200 a month against a stressed mortgage payment of £1,000 clears the bar comfortably. The same property against a payment of £950 might not, depending on the lender’s specific threshold and your tax position.
What top slicing changes
Top slicing lets a lender count some of your personal income – salary, other rental income, sometimes pension income – to make up the shortfall between what the rent alone supports and what the lender needs to see. It’s particularly relevant if you’re a strong earner buying in an area with lower rental yields, where the numbers on rent alone would never quite work.
Not every lender offers it, and those that do apply their own limits on how much personal income can be used this way, so it’s worth checking early rather than assuming it will simply be available.
Our fees
£295 application fee, 1% completion fee.
Frequently Asked Questions
What ICR percentage do I need to hit?
Typically 125% for basic-rate taxpayers, 145% for higher-rate taxpayers, though this varies by lender.
Can I use my overseas income for top slicing?
Sometimes, depending on the lender and the currency – this is exactly the kind of case where speaking to us early saves time.
Does top slicing affect the interest rate I’m offered?
Not typically – it affects whether the lender will approve the loan amount at all, rather than the rate itself.
What if my property fails ICR even with top slicing?
We’d look at either a smaller loan amount or a different lender with a lower threshold – there are usually options.
Is this only relevant for buy-to-let?
Yes, ICR is specifically a buy-to-let assessment method; residential mortgages are assessed on affordability differently.
Get in touch with your property’s rental figure and your income situation, and we’ll run the numbers properly.
