Let to buy mortgage calculator

Planning to rent out your current home and buy a new one? See how much equity you could release, whether the rent passes the lender’s stress test, and if you can afford your next home.
Your current home (to let out)
% of rent
Let to buy mortgage
Interest-only
Your new home
/year
× income
Repayment
Both mortgages, all costs
Equity you could release
£0

Rent passes the stress test: full LTV available

Let to buy loan
£0
Limit by LTV
£0
Limit by rent
£0
Interest / month
£0
Rental cash flow / month
£0

Your new home

Equity released
£0
Savings
£0
Stamp duty
£0
Legal & mortgage fees
£0
Deposit available
£0
Mortgage needed
£0
You could borrow up to
£0
New home payment / month
£0

You could afford this purchase

Stamp duty includes the 5% surcharge, because you will own two homes (England & NI rates). Lenders also check your credit and outgoings and may need the rent to cover the let to buy loan before they lend on the new home. Example figures, not financial advice.

Learn how to fund your portfolio →

Buy-to-let and finance questions

How is a buy-to-let mortgage payment calculated?

On interest-only, the monthly payment is the loan multiplied by the interest rate, divided by 12. A £150,000 loan at 4.9% costs £613 a month. On repayment, the payment also pays off part of the loan each month, using the standard mortgage formula over the full term, so the same loan over 25 years costs about £868 a month. Any arrangement fee added to the loan is included.

How much can I borrow for a buy-to-let?

Lenders check two limits and lend the lower one. The first is loan to value, usually up to 75% of the property’s value. The second is rental cover: the rent must cover the monthly interest by 125% to 160%, worked out at a stress rate. The calculator shows both figures for your property.

What is the rental cover or ICR test?

The interest cover ratio (ICR) compares the monthly rent with the monthly interest at the lender’s stress rate. At 125% cover, £1,250 of rent supports £1,000 of stressed interest. Higher and additional-rate taxpayers borrowing in their own name are usually tested at 145%, and HMOs at 145% to 160%. Fixes under five years are stressed at the higher of 5.5% or the pay rate plus 2%, while five-year fixes can be tested at the pay rate.

How much deposit do I need for a buy-to-let mortgage?

Usually at least 25% of the purchase price. Some lenders go to 80% loan to value, a 20% deposit, but rates are higher and the rental cover test is harder to pass. You will also need cash for stamp duty, legal and survey fees, and any refurbishment.

Should I choose interest-only or repayment?

Interest-only gives a lower monthly payment and stronger cash flow, which is why most landlords use it, but the whole loan is still owed at the end of the term. Repayment costs more each month and clears the debt. The right choice depends on your cash flow, your plan for repaying the loan and your wider portfolio, so talk it through with a broker or adviser.

Choosing the right property and area
  • Yield areas versus growth areas
  • Property types lenders and tenants want
  • Running the numbers before you view
Buy-to-let mortgages explained
  • Loan-to-value, interest cover ratios and stress rates
  • Fixed, tracker and interest-only products
  • First-time landlord criteria and getting the best from a broker
Personal ownership or limited company
  • How Section 24 affects individual landlords
  • SPV limited companies and how lenders treat them
  • Stamp Duty, including the rate for additional homes