UK Property Cash Flow Calculator
Estimate your rental yield and monthly profitability. Factor in mortgage costs, management fees, maintenance, and void periods to build a realistic buy-to-let budget.
Estimate Your Investment Returns
Enter your property details below to instantly project your monthly cash flow, annual profit, and true net rental yield.
Calculator Inputs
Provide your property figures to generate a personalised financial projection
| Expense Category | What’s Included |
|---|---|
| Mortgage Repayment | Monthly capital and interest payments to your buy-to-let lender. |
| Property Management | Letting agent fees for tenant finding, rent collection, and full management. |
| Maintenance Reserve | Regular upkeep, emergency repairs, appliance replacements, and redecoration. |
| Insurance & Compliance | Landlord insurance, EPCs, gas safety certificates, and inventory checks. |
Profit after all estimated monthly expenses
Key Factors Influencing Property Profitability
Understanding the variables that drive rental profitability helps you build a resilient and sustainable property portfolio.
Mortgage Interest Rates
Buy-to-let mortgage rates directly dictate your largest monthly expense. Even a 1% increase in interest rates can significantly erode monthly cash flow, making stress-testing your calculations essential.
Void Periods & Tenant Turnover
A property that sits empty for 4 weeks a year loses roughly 8% of its gross annual income. Factoring in a conservative void allowance ensures your cash flow projections remain realistic during market downturns.
Tax and Regulatory Changes
UK landlords face specific tax rules, including the restriction of mortgage interest tax relief to a basic rate credit and higher Stamp Duty Land Tax (SDLT) surcharges for additional properties.
Property Cash Flow FAQ
Answers to the most frequently asked questions about calculating rental yields and landlord expenses in the UK.
While this varies by location and strategy, many UK landlords aim for a positive monthly cash flow of at least £200 to £500 per property after all expenses, including mortgage, maintenance, and management fees. This provides a buffer for void periods and unexpected repairs.
Gross rental yield is your annual rental income divided by the property purchase price, expressed as a percentage. Net rental yield deducts all ongoing annual expenses (mortgage interest, management fees, maintenance, insurance, and void periods) from the rental income before dividing by the purchase price, giving a true picture of profitability.
Yes, absolutely. It is highly recommended to factor in at least 4 to 6 weeks of void periods per year (roughly 8-12% of annual rental income) to account for the time it takes to find new tenants between tenancies.
Yes, for individual landlords in the UK, property management fees are considered an allowable expense and can be deducted from your rental income before calculating your income tax liability. However, mortgage interest relief is now restricted to a basic rate tax credit.