Rent Increase Calculator (Section 13)
Check the size of a rent increase and the earliest date the new rent can legally take effect under the Renters' Rights Act 2025.
How rent increases work in 2026
Since the Renters' Rights Act 2025, the only lawful way to raise the rent on a periodic assured tenancy is a Section 13 notice on the current prescribed Form 4. You can do this once in any 12-month period, and you must give the tenant at least two months' notice before the new rent starts.
There is no statutory cap on the amount, but the tenant can refer the increase to the First-tier Tribunal, which sets the open-market rent and cannot order more than you proposed. So the earliest the new rent can take effect is the later of: two months from serving notice, and 12 months after the last increase.
Frequently asked questions
How often can I increase the rent in England?
Once in any 12-month period, using a Section 13 notice on the current prescribed Form 4, with at least two months' notice before the new rent starts.
Is there a cap on how much I can increase the rent?
There is no statutory cap on the amount, but the tenant can challenge the increase at the First-tier Tribunal, which sets the open-market rent and cannot order more than you proposed.
When can the new rent take effect?
No earlier than two months after you serve the Section 13 notice, and at least 12 months after the previous increase took effect.