A rental property that looks profitable on the surface high rent relative to purchase price can be a cash drain once expenses, void periods, and financing costs are factored in. The ROI Calculator runs all four key metrics instantly so you can compare properties objectively before making an offer.
Four Metrics Every Rental Investor Needs
1. Gross Rental Yield
Gross Yield = (Annual Rent ÷ Purchase Price) × 100A quick filter metric. In the UK, gross yields of 6–8% are considered strong; in the US, 8–12% is common for buy-to-let. Anything below 4% gross rarely survives the expense layer.
2. Net Rental Yield
Net Yield = ((Annual Rent − Annual Expenses) ÷ Purchase Price) × 100Annual expenses include: mortgage interest (if leveraged), maintenance, management fees (typically 8–12% of rent), landlord insurance, ground rent and service charge (leasehold), and void periods. Budget at least one month of rent per year for voids unless the market is exceptionally tight.
3. Annual Cash Flow
Cash flow is the actual money left after all expenses including mortgage payments are subtracted from rental income. A property can have a positive net yield but negative cash flow if it is heavily leveraged. Target positive cash flow from day one; appreciation is a bonus, not a business model.
4. Payback Period
Payback Period = Purchase Price ÷ Annual Net IncomeThe number of years to recoup the purchase price from net rental income. A payback period of 15–20 years is common in urban markets; rural or high-yield markets can be 8–12 years.
How Leverage Affects ROI
Using a mortgage amplifies both gains and losses. If you put down 25% on a £200,000 property (£50,000 deposit) and the property generates £10,000 net income per year, your cash-on-cash return is 20% even if the gross yield is only 5%. Use our Loan Calculator to model different mortgage scenarios before committing.
Currency and International Investment
If you are investing in property outside your home currency, exchange rate movements affect your effective return. A 5% rental yield in a currency that depreciated 8% against yours produced a negative real return. Our Currency Converter uses live rates to show real-time equivalent values.
Frequently Asked Questions
What is a good ROI for rental property?
A common benchmark is a net yield above 5% and positive cash flow. According to BiggerPockets, experienced investors typically target a minimum 8–12% cash-on-cash return. Below 4% net yield, rental income rarely justifies the illiquidity and management overhead of direct property ownership.
Should I include appreciation in my ROI calculation?
Model ROI from income only. Capital appreciation is speculative and varies enormously by market cycle. An investment that only makes sense if the property appreciates is not a rental investment it is a bet on price growth. Income ROI is what makes a property sustainable.
How do I account for renovation costs?
Add renovation costs to your effective purchase price in the calculator. A property bought for £150,000 requiring £20,000 of work has an effective cost basis of £170,000. Yield calculations should always use the total capital deployed, not just the purchase price.