The core rules
- Use the allowable amount for the year — for 2026 the limit is 2.3%.
- Give at least three full months’ written notice before the increase takes effect.
- Increase the rent only once every 12 months for the same tenant.
- Serve it on the official Notice of Rent Increase (RTB-7).
Watch the effective date
The increase takes effect on a rent-due date, after three whole months have passed. Notice given anywhere in January (rent due on the 1st) means the increase starts May 1 — not three calendar days later. How you serve the notice can also add days before it is considered received.