Rental yield is the figure quoted most often in property discussions and the one that describes least. It captures a single relationship and omits most of what determines whether an investment works.
What gross yield actually measures
Gross yield divides annual rent by purchase price. It is a comparison of income against capital committed, expressed as a single percentage figure.
Its usefulness is as a screening tool. Two properties in different areas can be compared quickly without needing detailed information about either.
Its weakness is that it assumes the rent is collected in full every month and that owning the property costs nothing, neither of which is true.
Net yield removes the costs
Net yield subtracts running costs before dividing: management, maintenance, insurance, ground rents or service charges, and property taxes where the owner bears them.
The gap between gross and net is large and varies by property type. Older buildings and those with shared services carry costs that newer freehold properties do not.
Vacancy belongs here too. A property empty for part of the year collects less than twelve months of rent, and turnover between tenants adds letting costs each time.
Capital movement dominates over long periods
Total return adds the change in the property's value to the income received. Over a long holding period, that component frequently exceeds the accumulated rent.
This is why low-yielding properties in strong locations can outperform high-yielding ones elsewhere. The income figure is the part being sacrificed for the expectation of capital growth.
It also cuts the other way. A high yield is often high because the market expects the capital value to stagnate or decline, and the extra income is compensation for that risk.
Leverage changes both sides
Most property is bought with borrowing, which means the return is earned on the deposit rather than on the full purchase price.
Borrowing magnifies capital movement in both directions, and it converts part of the rent into interest, so the yield the owner experiences differs from the yield the property produces.
Interest rate changes therefore move the return without anything about the property changing, which is the mechanism by which a viable letting becomes unviable.
Why transaction costs belong in the calculation
Buying and selling property involves duties, legal fees, agency commission and survey costs that together represent a significant share of value.
Those costs are incurred once but they are large enough to consume several years of yield, which is why short holding periods rarely work in property.
A return calculated without them describes the asset rather than the investment, and the difference between the two is what determines the actual outcome.