Rent increase date calculator
Work out the earliest date a rent increase can lawfully start on an assured tenancy in England. It applies the three timing rules in Note A of Form 4A: two months' notice, the 52 or 53-week gap, and the tenancy-period boundary.
This is a free guide, not legal advice, and it does not check whether Form 4A is the right notice for your tenancy. Always confirm against the current form on GOV.UK.
Fill in the dates above.
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Build my noticeHow the calculation works
The date you put in question 4.6 of Form 4A — when the new rent starts — has to satisfy all three of these at once:
- Two months' notice. Counted from when the tenant receives the notice. If you post it, first-class post is generally treated as served on the second working day after posting, so the calculator adds that.
- 52 (or 53) weeks. Rent can't rise in the first 52 weeks of the tenancy, and each later increase must be at least 52 weeks after the last. If the date would land more than six days before the anniversary of your first post-2003 increase, you wait a 53rd week.
- Start of a tenancy period. A monthly tenancy that began on the 14th must increase on the 14th; a weekly tenancy that began on a Monday must increase on a Monday.
The calculator takes the latest of the first two dates, then moves forward to the next valid period boundary. You can serve later than the earliest date — you just can't serve earlier.
Common mistakes this catches
- Choosing a start date less than two months away.
- Forgetting that posting adds a couple of days before the clock starts.
- Picking the 1st of the month when the tenancy started mid-month.
- Increasing again less than a year after the last increase.