The Istat rent update: what an Italian landlord can add each year
Enter the rent, the Istat month named in the lease and the type of lease: the tool applies the right share of the FOI change.
Most Italian leases let the landlord update the rent once a year in line with Istat’s FOI index excluding tobacco: the aggiornamento Istat. What is applied is the index’s twelve-month change for the month named in the lease, in full or in part. The latest published change is for September 2026: 4.0%. On a rent of €1,000 a month, a 100% update gives €1,040.00 and a 75% update €1,030.00. The share depends on the lease. For premises not used as a home, such as shops and offices, article 32 of Law 392/1978 caps the increase at 75% of the change recorded by Istat. For homes let at an open-market rent (the 4+4 contract under Law 431/1998), the parties can agree up to 100%; agreed-rent contracts (3+2) follow the local territorial agreement, usually 75%. If the landlord has opted for the flat-rate tax on rental income, the cedolare secca, the right to ask for the Istat update is suspended for as long as the option runs, even if the lease provides for it.
New monthly rent
€832.00
+€32.00 a month · +€384.00 a year
| FOI change to September 2026, 12 months | 4.0% |
| Share applied | 100% |
| Increase applied | 4.00% |
| New rent | €832.00 |
Assumptions
Annual change in the FOI index excluding tobacco, published by Istat for the month named in the lease. The landlord has to ask for the update. Method and sources
Checked by Radif Partners · Editorial policy · Method and sources
Which share for which lease
| Lease | Rule | Share of the FOI change |
|---|---|---|
| Home, open-market rent (4+4) | Law 431/1998 | Up to 100% if agreed |
| Home, agreed rent (3+2) | Territorial agreement | Usually 75% |
| Shop, office, other non-residential | Law 392/1978, art. 32 | 75% at most |
| Any lease under cedolare secca | Leg. Decree 23/2011, art. 3(11) | No update |
A €1,000 rent with recent months
| Istat month in the lease | FOI change | New rent at 100% | New rent at 75% |
|---|---|---|---|
| September 2026 | 4.0% | €1,040.00 | €1,030.00 |
| August 2026 | 3.4% | €1,034.00 | €1,025.50 |
| July 2026 | 2.8% | €1,028.00 | €1,021.00 |
| June 2026 | 2.9% | €1,029.00 | €1,021.75 |
| May 2026 | 3.0% | €1,030.00 | €1,022.50 |
| April 2026 | 2.6% | €1,026.00 | €1,019.50 |
The month is the one stated in the lease, often the month before the anniversary. Ask for the update in writing, giving the month, the published change, the share applied and the new rent. The full series is in the FOI index; revaluing a sum between any two months is in the Istat revaluation.