To create a Section 13 rent increase notice (Form 4A), open Tenancy Builder, click Other Forms in the sidebar, then click add new and select Form 4A Section 13 rent increase.

To get more information on completing the form and what to put in each field, please see this page for step-by-step instructions: https://england.landlordsguild.com/article/how-to-complete-form-4a-section-13-notice

The notice must use the prescribed Form 4A and give the tenant at least two months' notice. The official prescribed form is also available on GOV.UK: https://www.gov.uk/guidance/assured-tenancy-forms#Form4A

Other Forms - Section 13 Rent Increase