Rental Yield Calculator
Calculate gross and net rental yield, full return on investment with SDLT and mortgage costs, or find the rent you need for your target yield. UK 2025/26 rates including 5% additional property surcharge.
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How to Use This Calculator
Gross & Net Yield tab
Enter the property value, monthly rent, and annual expenses to see your gross and net rental yield instantly. Toggle "Use expense breakdown" to calculate expenses from individual components: letting agent fee, landlord insurance, maintenance, void periods, service charge, and ground rent. The calculator compares your yield to the UK average of ~5-6%.
Full ROI tab
Go beyond yield to see your true return on cash invested. Enter your deposit, mortgage rate and term, and the calculator works out SDLT (with the 5% additional property surcharge), mortgage payments, and your cash-on-cash ROI. It also checks if your rent meets lender rental coverage requirements (125-145%).
Target Rent tab
Working backwards: enter a property value and your target yield to find the monthly rent you need. Also enter your actual or expected rent to see what yield it gives. The yield table shows returns at different rent levels so you can see how close you are to your target.
Share your result
Every input is encoded in the URL. Click Share to send your exact scenario to a partner, mortgage broker, or save it for later.
The Formula
Rental yield measures the annual return from rental income relative to property value:
Net Yield = ((Annual Rent − Annual Expenses) / Property Value) × 100
Cash-on-Cash ROI = (Annual Profit after Mortgage / Total Cash Invested) × 100
SDLT (additional property) = Standard SDLT bands + 5% surcharge on entire price
Rental Coverage Ratio = (Annual Rent / Annual Mortgage) × 100
Gross yield is the simplest measure — it tells you the raw income return before any costs. Net yield subtracts running expenses but not mortgage costs, making it useful for comparing properties regardless of how they are financed. Cash-on-cash ROI is the most practical measure for leveraged investors, as it shows the return on the actual money you put in.
The 5% SDLT additional property surcharge (increased from 3% in the Autumn Budget 2024) significantly affects buy-to-let economics. On a £250,000 property, the surcharge alone adds £12,500 to your purchase costs.
Example
Sarah — First-time landlord, Leeds
Sarah is buying a £250,000 terraced house in Leeds to rent out. She expects £1,100/month rent and estimates £5,000/year in expenses. She has a 25% deposit and a mortgage at 5% over 25 years.
Gross & Net Yield tab
Sarah's gross yield of 5.28% is close to the UK average. Her net yield of 3.28% reflects the true income return after expenses.
Full ROI tab
With current mortgage rates, Sarah barely breaks even on cash flow. Her real return will come from capital appreciation and mortgage paydown by her tenants. This is typical for many UK buy-to-let investments in 2025/26.