Buy-to-let has long been seen as a route to passive income and long-term wealth. But while the appeal is clear, many borrowers assume a BTL mortgage works the same way as a residential one. It doesn't, and nowhere is that clearer than in the ESIS.
An ESIS (European Standardised Information Sheet) is the document all UK and EU lenders must provide before a mortgage agreement is made, giving borrowers a clear, consistent breakdown of the product on offer. For a deeper look at what to check on a standard illustration, read our guide here.
On a buy-to-let product, though, the ESIS carries extra layers that a residential illustration doesn't.
Why BTL Is Different
The FCA treats buy-to-let as a business transaction rather than a consumer one, so the protections that apply to residential mortgages don't always carry over. Rather than focusing on personal income, lenders look at rental yield, since that's what services the debt. This changes what appears on the ESIS and what you're responsible for checking.
One exception: "accidental landlords" (those who inherited a property, for example) fall under a different framework, so their ESIS may look slightly different again. If you're unsure which category applies, speak to a broker.
The APR Can Look Different Than Expected
Arrangement fees and rental coverage assumptions all feed into the BTL APR calculation, which can make the figure look higher or lower than you'd expect from a residential mortgage. Focus on what's driving the number rather than the number itself.
The Interest Coverage Ratio (ICR)
The ICR confirms that rental income will comfortably cover mortgage payments, typically requiring rent to cover 125% to 145% of the monthly payment. Lenders test this against a stress rate (often 5% to 5.5%), not your actual product rate, which can cause confusion when the figures don't match. Your tax position matters too: higher and additional-rate taxpayers are typically stress-tested more harshly than basic-rate taxpayers or limited company borrowers. If the ICR isn't met, a larger deposit, smaller loan, or different product may be needed.
Red Flags to Watch For
- Revert rate: Once your deal ends, the mortgage reverts to the lender's SVR, often shown but easily overlooked. On interest-only BTL products, this jump can be significant.
- True cost over the term: Because the capital doesn't reduce on an interest-only mortgage, the total repayable figure includes the full loan plus all interest. Make sure you have a repayment strategy in place if you opt for an interest only mortgage. This isn’t exclusive to interest only properties either. Always make sure that you can afford your payments for a the fixed term as well.
- Fees added to the loan: Rolling fees into the loan feels painless upfront but means paying interest on them for the full term. Check whether your ESIS has done this.
- Stress rate vs actual rate: Both can appear on the ESIS. Know which is which before drawing conclusions about cost.
- Rental income assumptions: Lenders sometimes use their own estimate rather than yours. Check it reflects what the property will realistically achieve.
- Early Repayment Charges: These can be substantial on BTL products, particularly longer fixes. Check the period they cover against your exit plans.
Making Sense of It All
A buy-to-let mortgage is an investment decision, and the detail in the ESIS can have a real impact on your returns if it goes unnoticed. None of it is insurmountable, you just need to know what you're looking at.
Ready to Make Sense of Your Buy-to-Let Mortgage Illustration?
At Hello Mortgage, we'll walk you through your ESIS line by line, in plain English, covering the figures that matter and the questions you should be asking before saying yes.
Tel: 0800 292 2557
Email: hello@hellomortgage.co.uk
Please note: Your home may be repossessed if you do not keep up with repayments of your mortgage.
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