Rental property is commonly assessed on yield, a figure that describes income relative to price. It answers only part of the question about what the investment actually produced.
Gross yield is the crudest of the three measures
Gross yield divides annual rent by the purchase price. It is easy to calculate from information available before buying, which is why listings quote it.
It assumes the property is let continuously and that the landlord receives every pound of rent, neither of which holds in practice over a full ownership period.
As a screening tool for comparing properties in the same market it is serviceable. As a description of what an owner receives it is consistently optimistic.
Net yield subtracts the cost of ownership
Net yield deducts the recurring costs: management fees, insurance, maintenance, service charges, ground rent where applicable, and the periods when no tenant is in place.
Those costs are not marginal. Between voids, repairs and agent fees, the gap between the gross and net figures is often substantial, and it widens with older buildings.
Maintenance in particular is lumpy rather than steady. A boiler or a roof arrives as a single large expense that a smooth annual estimate tends to understate.
Capital movement sits outside yield entirely
Yield says nothing about what happened to the value of the property. A holding can produce a solid income while the asset itself falls in value.
Total return combines the net income with the change in capital value over the period, which is the only figure comparable to a return quoted on any other investment.
The two components frequently move in opposite directions, since areas with the strongest capital growth often price rents at lower yields relative to value.
Leverage changes the arithmetic on both sides
Most rental property is bought with a mortgage, so the owner's capital is a fraction of the asset price. Returns should be measured against that capital, not the full value.
Borrowing magnifies gains and losses alike. A modest movement in property value becomes a large movement in the equity actually invested.
Interest cost also has to come out of the income before anything reaches the owner, which can turn a positive net yield into a negative cash position.
Transaction costs are recovered slowly
Buying and selling property carries legal fees, taxes on the transfer and agent commission, all of which are large relative to the annual income produced.
Spread across a short holding period, those costs consume a substantial share of the return. Spread across a long one, they become minor.
This is the structural reason property is treated as a long-horizon asset: the entry and exit costs need years of income and growth to absorb them.