Section 13 Rent-Review Calculator

Under the Renters Rights Act 2025, there is no statutory percentage cap on rent increases in England. A landlord may propose any amount using Form 4A, but the tenant can refer it to the First-tier Tribunal. The tribunal cannot set a higher rent than proposed but can set a lower one based on open-market value.

Form 4A is the prescribed Section 13 notice form required for all rent increase notices served on or after 1 May 2026 in England. Notices served before that date could use the old Form 4, which is now void for new notices. The effective date in Form 4A must fall on a rent payment day.

The 52-week rule means a landlord cannot serve a new Section 13 notice until at least 52 weeks have passed since the last rent increase took effect. This applies to all periodic tenancies in England under the Housing Act 1988 as amended by the Renters Rights Act 2025.

From 1 May 2026, a landlord must give at least one month's notice for monthly periodic tenancies, or one full period's notice for other payment frequencies. The notice must use Form 4A and the new rent cannot take effect before the date specified in the form.

There is no statutory cap. The landlord proposes a new rent via Form 4A; the tenant may challenge at the First-tier Tribunal, which assesses open-market value and cannot award more than proposed. This calculation is based on Section 13 of the Housing Act 1988 as amended by the Renters Rights Act 2025.

Old Form 4 is void for any notice served on or after 1 May 2026. Only Form 4A is valid. Any notice served on or after that date on the old form has no legal effect.