Ask what an Istanbul apartment yields and you will be given a percentage. Ask how it was calculated and the conversation usually ends, because the number was gross: a year of hoped-for rent divided by the purchase price, with nothing taken out. It is the largest, friendliest and least useful figure in the transaction.
The number that decides whether an investment worked is net yield: what reaches your account after the building, the taxman, the manager and the empty months have taken their share. On the same apartment, the two figures are not close. Model the first and live with the second and you will feel misled, and often nobody actually lied to you.
This guide is how the calculation really works, what moves it, and which of those things you control. It carries no yield percentages, for the same reason our tax guide carries no rate table: a number quoted for a market is not a number for your apartment, and we would rather model yours than impress you with somebody else's.
Gross yield, and everything it leaves out
Gross yield is annual rent divided by purchase price. It is easy to compute, easy to compare, and it assumes a year with twelve months of rent, no service charge, no tax, no agent, no repair and no gap between tenants. No apartment has ever had that year.
Net yield takes the same rent and subtracts the costs that are certain: the aidat, income tax on the rent, management or letting fees, insurance, maintenance, and the weeks the property sits empty between tenancies. What remains, divided by what you actually paid (including the purchase costs, not just the price), is the return.
The gap between the two is not a rounding difference. It is the whole basis of a decision, and the reason our calculators show gross while saying plainly that gross is not the figure that matters.
The seven costs that turn gross into net
In the order they usually surprise people.
- Aidat, the building's service charge. In an amenity-rich Istanbul development it is the single largest deduction, it is charged every month whether or not there is a tenant, and it is the figure most often missing from a yield model.
- Void periods, the weeks between tenancies. One empty month is more than eight per cent of the year's rent gone, and one month is not a pessimistic assumption.
- Income tax on rent, on a progressive scale with an exemption threshold and certain deductible expenses.
- Letting and management fees, if you are not in Istanbul to do it yourself. And if you are not there, you are not doing it yourself.
- Maintenance and replacement: the appliance, the boiler, the repaint between tenants. Small annually, certain over five years.
- Insurance: DASK, plus contents cover if the apartment is let furnished.
- The purchase costs themselves. A yield measured against the price rather than against the total you spent flatters itself by several per cent.
Rent evidence: new-tenant index before asking rent
Asking rent is not achieved rent. It is a landlord's opening position, often repeated across portals, and it can move faster than signed contracts.
Since 17 February 2026, TCMB's New Tenant Rent Index has given an official context for newly agreed rents. We use it as market context, then test the specific residence against dated comparable lets in the building and district, current aidat, tax, management cost and a stated void assumption.
A yield range only belongs in that residence-level model. Without dated price, rent, aidat, void and tax inputs, it is a sales percentage rather than an investment answer.
Why the same apartment yields differently for two owners
Two investors buy identical apartments in the same block on the same day and end the year with materially different returns. Nothing about the property explains it.
One let the apartment unfurnished and waited eleven weeks for a tenant. The other furnished it and let it in three. One accepted the first offer that came. The other screened three and took a corporate tenant on a two-year lease. One was in Istanbul when the boiler failed and had it fixed that day. The other was in Riyadh, and paid twice as much a week later.
This is why we treat management as part of the investment rather than as an afterthought sold separately. The yield is not a property of the apartment. It is a property of the apartment and the operation around it.
What actually drives rental demand in Istanbul
Rent follows tenants, and tenants follow a small number of things that do not change quickly.
Transport is first, and specifically the walk to a metro station rather than the distance on a map. An apartment eight minutes from a station lets to a different, larger and more reliable population than one that needs a bus first, and the rent reflects it.
Then employment: proximity to a business district, a university or a hospital creates a resident tenant pool that renews itself every year. Districts that are purely residential rely on people choosing to live there, which is a smaller and more fashion-sensitive market.
Then the match between the apartment and the tenant the area actually has. A three-bedroom family apartment in a district full of young professionals is a slow let at a discount. A compact one-bedroom in a family suburb is the same problem the other way round. This is the most common mismatch we see in investment purchases, and it is entirely avoidable at the point of choosing.
Finally the building itself. Security, a lift that works, a managed entrance, grounds that are maintained. These are what let an apartment quickly and at the top of its range, and they are also what the aidat is buying.
Income or capital growth: they rarely arrive together
Income-led locations and growth-led locations are usually not the same choice, and an investor who asks one purchase to do both often gets a compromised version of each.
Established central areas with deep tenant demand tend to deliver steady, predictable income and slower growth, because the growth already happened. Developing corridors do the opposite. A new metro line, a regeneration zone, a district the city is expanding into: these can appreciate over a longer horizon while renting for less in the meantime.
Off-plan sits at the far end of that trade: no current income until delivery, possible price upside, and construction risk. It suits an investor with a horizon and no need for cash flow, and it is a poor fit for one who needs the apartment to pay for itself from year one.
The honest first question is therefore not 'what yields best' but 'do you need this to pay you now, or to be worth more later'. The answer excludes half the market immediately, which is the point.
Long lets and short stays are two different businesses
A long residential tenancy is a low-effort, low-variance business: one tenant, one contract, one transfer a month, and a manager who is rarely needed.
Short-stay letting is a hospitality operation. The gross income can be higher. Against it sit cleaning between every guest, linen, consumables, listing fees, dynamic pricing, guest communication at any hour, heavier wear, and real seasonality, because Istanbul's tourist year is not flat. Net of all that, the advantage over a long let is smaller than the headline nightly rate suggests, and it depends entirely on running the thing well.
There is also a permission question, and it is not optional. Tourism-purpose letting of 100 days or less in Türkiye needs the short-let permit branch and permit number, and many buildings prohibit it in their own management plan regardless of national law. If short-stay is the plan, establish it for that specific building before you buy. We have watched buyers discover the prohibition after completion, holding an apartment bought for a business it is not allowed to run.
Currency: the question every foreign investor should ask second
Your rent is collected in Turkish lira. If you measure your return in dollars, euros or pounds, the exchange rate is part of the outcome and it is outside your control.
This cuts both ways and it is dishonest to present only one edge. A period of lira weakness reduces the hard-currency value of the rent you collect, while the same period has historically coincided with a foreign buyer's purchasing power being unusually strong at the point of entry, and with strong nominal price growth in lira terms. Which effect dominates depends entirely on when you bought, when you sold, and what you did with the income in between.
What we can say without a forecast: model your return in the currency you will actually spend, treat lira rental growth and hard-currency return as two different questions, and be sceptical of anyone who quotes you a yield in dollars without saying which exchange rate they used and when.
Guaranteed rental returns, and what they usually are
Some developments are marketed with a guaranteed rental return for a fixed period. Occasionally these are genuine. Frequently they are your own money, returned to you slowly.
The mechanism is simple: the guaranteed amount is added to the purchase price, then paid back to you over the guarantee period and described as yield. You have pre-paid your own return and thanked the developer for it. The tell is the price of an identical apartment in the same building without the guarantee.
Two questions settle it. Who is the counterparty: the developer, a group with a balance sheet, or an entity created for this project and this sale? And what happens in year four, when the guarantee ends and the apartment has to let on its own merits, in a building where every other owner is trying to do the same thing at the same time?
How we model a return for a specific apartment
Before you buy, you receive a written model for that apartment. Achievable rent, based on what comparable apartments in the building and the district are actually let for rather than on asking prices. The building's current aidat. The tax position. Management and letting costs. And an assumed void period, stated plainly as an assumption.
It produces two numbers, gross and net, and net is the one we discuss. If the net figure does not support the case for buying, we would rather say so before the purchase than manage the disappointment afterwards.
We do not quote guaranteed returns, and we do not publish a district yield table. Both are ways of sounding certain about something that depends on an apartment we have not yet chosen with you.
