Iran's 57 Point Rent Inflation Gap: Three Reasons the Official Index Misses What Tenants Actually Pay (Tuesday, July 28, 2026)

The Statistical Center of Iran reported year on year rent inflation of 31.2 percent for Khordad 1405 (the Iranian month ending 21 June 2026), while general year on year inflation in the same month stood at 88.6 percent. That gap of nearly 57 percentage points makes rent the slowest moving item in the household basket. Yet a tenant signing a new lease in Tehran that month faced growth close to 40 percent, according to Donya e Eqtesad, with landlords' asking prices 43 percent above a year earlier. Neither number is wrong. They measure two different things, and understanding that difference is the whole story of Iranian rent in 1405.

Background

The Statistical Center's rent index has drifted lower over the past year. In Bahman 1404 (February 2026) it ran at 32.3 percent year on year and 34.7 percent annual average; by Ordibehesht 1405 (May 2026) it reached 30.9 percent year on year and 33.2 percent annual, the lowest level in 41 months, since Dey 1401 (January 2023); and in Khordad 1405 it settled at 31.2 percent year on year and 32.8 percent annual. The subtle point sits right there: the annual average fell, but the year on year rate ticked up from Ordibehesht to Khordad. That pattern usually means a wave of leases has come due and part of the accumulated pressure is only now entering the index.

Over the same stretch the Central Bank of Iran, which measures with a different sample and method, recorded 57.7 percent annual and 83.1 percent year on year inflation for Khordad 1405, and saw the "housing, water, electricity, gas and other fuels" group, weighted at 37.58 percent and therefore the heaviest item in the basket, rise only 4.7 percent on the month. Sahmino examined that same slowness in an earlier report available in our articles archive. The Central Bank's newest release, published on Tuesday 28 July 2026 for the month of Tir 1405, turns the picture: the urban index reached 742.8 points, monthly inflation 3.6 percent (half the 7.4 percent of Khordad), year on year 83.9 percent and annual 61.4 percent. But in that same month the housing and energy group posted 5.9 percent, the highest monthly rise of any group. Just as general inflation slowed, the housing group accelerated.

One methodological warning is necessary: the Statistical Center's dedicated rent sub index for Tir 1405 had not been published as of 28 July 2026. The last firm rent figure remains Khordad 1405, and any Tir number attributed to rent is the broad group figure, not net rent.

The numbers

Measure	Value	Date and source
Year on year rent inflation	31.2 percent	Khordad 1405, Statistical Center of Iran
Year on year general inflation	88.6 percent	Khordad 1405, Statistical Center of Iran
Registered Tehran lease rents	about 40 percent growth, 458,000 tomans per square metre	Khordad 1405, Donya e Eqtesad
Tehran asking rents	43 percent growth, 660,000 tomans per square metre	Khordad 1405, Donya e Eqtesad
Legal cap on rent increases	25 percent	1405, decision of the heads of the three branches
Deposit share of total rent	about 65 percent	Tir 1405, Fararu and Donya e Eqtesad
Housing share of the urban household basket	43.7 percent	Year 1403, Statistical Center of Iran
One year Tehran house price growth	9.7 percent	Khordad 1405

For comparison, the parallel markets sat elsewhere on Tuesday 28 July 2026: the US dollar at 190,200 tomans, up 1.17 percent; 18 carat gold at 18,341,300 tomans per gram, up 0.72 percent; and the Tehran Stock Exchange all share index at 5,109,004 points, up 1.13 percent.

The drivers

One: the index measures the stock, not the flow. The Statistical Center figure is a weighted average of rent changes across the entire stock of contracts, most of which are fixed one year leases. A tenant moving today faces the marginal market price, not a twelve month average. This is the classic stock versus flow problem that makes rent indices lag new lease rates in every country; in Iran the effect is simply amplified.

Two: the 25 percent cap mechanically holds the registered figure down. The 1405 decision of the heads of the three branches, announced by Roads and Urban Development Minister Farzaneh Sadegh in Tir 1405 (July 2026), set a nationwide maximum increase of 25 percent, added automatic one year renewal at the tenant's request, and barred eviction orders based solely on lease expiry. Enforcement runs through the Khodnevis registration system and its tracking code; Sahmino covered the operational detail in our news desk. When the official ceiling is 25 percent, the registered contract appears near that number and the excess is recovered through an inflated deposit or an unregistered side agreement. Notably, even the real estate agents' union wanted a higher cap: its head Kianoush Goodarzi proposed 27 percent for Tehran city and 23 percent for towns above 100,000 people in Tehran province on 28 Khordad 1405 (18 June 2026).

Three: the pressure has migrated into the deposit, and the deposit is invisible to the index. This is the critical link. The deposit share of total rent has reached about 65 percent, having spiked to as much as 80 percent in Esfand 1404 (March 2026) before deposit loans settled it back around 65 percent. A Donya e Eqtesad worked example from Esfand 1404 is telling: a mid sized Tehran unit carrying a deposit of 1.2 billion tomans alongside monthly rent of 9 million tomans, at a customary conversion rate of roughly 30,000 tomans of monthly rent per 1 million tomans of deposit. A landlord watching rial rent income evaporate under inflation above 80 percent takes a larger upfront sum and moves it into inflation resistant assets. If the index mainly tracks the monthly rent component, that migration stays almost invisible. Our Learn hub walks through how deposit and rent convert into one another.

And one honest complication: part of this gap may not be statistical at all. A Statistical Center official has said plainly that rent increases cannot exceed the inflation rate because tenants' ability to pay has fallen. In other words, rent may genuinely have lagged general inflation, not because the market is calm, but because the ceiling on household affordability will not allow more. The full picture is a blend of both: partly methodological, partly real.

Outlook

The weight of this pressure in the household budget is no longer marginal. Housing took 43.7 percent of the urban household basket in 1403, above the European Union's 40 percent threshold for unaffordable housing cost burden; in Tehran the ratio was reported at 51 percent in 1401 and 56 percent in 1402, and Babak Negahdari, head of the Parliamentary Research Center, has put it at 60 to 70 percent for tenant deciles, against a global average of 18 percent and a range of 15 to 25 percent.

On the ownership side the escape route is closed too. The last official average price per square metre in Tehran, from Mordad 1404 (August 2025), was about 88.5 million tomans, which puts a 100 square metre unit near 8.85 billion tomans, while the maximum purchase loan for a married couple in Tehran is 1 billion tomans, less than roughly 12 percent of that unit's price. According to an official report, an average Tehran household would need the equivalent of 23 years of full income to buy a 75 square metre unit in mid range districts, and 68 years if saving one third of annual income.

And a point that matters for investors: housing itself was no refuge this year. Tehran house prices rose only 9.7 percent in the year to Khordad 1405, and District 5, the most actively traded district, only 5.8 percent. The market is in a deep transaction slump, with about 3,872 deals registered in Khordad, 20 percent fewer than in Ordibehesht. Even the paper instrument did not help: the Arzesh Maskan real estate fund posted a negative return in the year to Ordibehesht 1405. This analysis is not a recommendation to buy, sell or lease.

Bottom line

The official figure does not lie, but it does not tell the whole truth either. The Statistical Center's 31.2 percent is an average across the entire stock of contracts, while Tehran's 40 percent is the new lease price. Three mechanisms build the distance between them: averaging over the stock, the 25 percent cap that holds the registered figure down, and the migration of pressure into a deposit the index cannot see. If you remember one thing, make it this: while the deposit accounts for roughly 65 percent of total rent, a monthly rent index cannot be a complete measure of real housing cost.

What to watch

• The Statistical Center's rent sub index for Tir and Mordad 1405: if the year on year rate moves from about 31 percent toward 40 percent, the renewal wave is transmitting accumulated pressure into the index and the gap is closing; if it falls below 30 percent, the affordability ceiling hypothesis strengthens.
• The deposit share of total rent and the customary deposit to rent conversion rate during the moving season.
• The Central Bank's monthly housing and energy group readings, which led all groups in Tir 1405.
• Actual enforcement of the 25 percent cap through the Khodnevis system and its tracking code.
• Monthly Tehran housing transaction volumes as a signal of whether the slump is ending.