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Estimate the earliest increase and latest service dates for an England tenancy, with the percentage change and service assumptions shown.
Earliest increase date under the assumptions
1 February 2027Percentage change
5.00%From £1,000 to £1,050 per rental period.Under the entered rent-cycle and service assumptions, the 5.00% increase is no earlier than 1 February 2027.
Latest date to serve for a chosen increase date
1 December 2026 for an increase on 1 February 2027.
The entered effective service date is on or before the deadline for the planned increase.
Assumptions used
Rates as of
Example: monthly rent cycle starting 1 February 2025, a first increase on 1 February 2026 and a planned increase on 1 February 2027.
A rent increase has more than one clock. The notice must give the tenant enough time, the tenancy must have reached the first-increase point, and an earlier increase may postpone the next one. A date that meets the notice length alone is not necessarily a valid increase date.
Start with the effective service date. For post, this is not automatically the day you send the envelope. For email, the written agreement must permit that method. The tool does not add a delivery allowance or decide whether disputed service was effective.
The calculator adds two calendar months to service and checks 52 weeks from the tenancy start and, where entered, 52 or 53 weeks from the latest increase. It then moves to the next start of the entered rent cycle.
The percentage is arithmetic, not a recommended increase. The tool has no valuation or comparable-property data, so it cannot show whether a rent is excessive or reflects the local market.
This version covers notices served from 1 May 2026 for private assured tenancies in England with periods of a month or less. It does not cover agricultural occupancies, relevant low-cost tenancies, regulated tenancies or property elsewhere in the UK.
When a month lacks the matching notice day, the calculation moves to the first day of the next month; a rental day that a short month lacks uses its final day. Check unusual month-end terms against the agreement.
Form 4A also uses the first rent increase after 11 February 2003, and its six-day anniversary test can require 53 weeks instead of 52. Do not replace an unknown first increase with the latest one; check older statutory and tribunal records. The tool covers a regular cycle where the last increase is within six days of the original anniversary. An irregular or changed annual cycle, or a first increase on 29 February, is referred for legal review rather than assigned a date.
The planned increase date must meet the annual timing rule and fall on a rental-period start, and its latest-service deadline is for effective service, not posting. The result is a timing estimate from the entered facts, not confirmation that a notice is valid.
The monthly tenancy began on 1 February 2025. Its last increase took effect on 1 February 2026. A notice is served in person on 12 October 2026, proposing £1,050 instead of £1,000 per month.
The February anniversary matches the GOV.UK rent-increase example; the service date and rents are illustrative. The first increase entered is also 1 February 2026. For the chosen 1 February 2027 increase, effective service must occur by 1 December 2026.
The Renters’ Rights Act 2025 amended the Housing Act 1988 rent-increase procedure. The commencement regulations brought the private-tenancy changes into effect on 1 May 2026, while preserving specific transitional arrangements. The official Form 4A explains notice length, annual timing and rental-period alignment together.
Older notices and increases agreed under rent-review clauses can need transitional checks, and this tool does not validate a pre-May notice. A tribunal referral can also change what happens next, so a date calculation is not authority to demand a disputed amount.
Ask a solicitor or your tenancy authority before relying on a notice if service is disputed, the tenancy’s legal type is uncertain, the rent period changed, an earlier increase is contested, historic increase records are incomplete, the tenant challenges the proposal, or the tenancy falls outside the England assumptions.
Keep the agreement, rent history, completed notice and evidence of service together; a screenshot of this result cannot replace them.
For the England private assured tenancies covered here, Form 4A requires at least two calendar months. The increase must also satisfy the annual timing rules and begin at the start of a rental period. The sources below include Form 4A and its timing notes.
The current GOV.UK guidance says the Section 13 process must be followed for these private assured tenancies, even where the tenant agrees. A calculator result is not a notice and does not replace completing and serving Form 4A.
Yes. The reforms taking effect on 1 May 2026 allow increases through the statutory process, generally once a year with two months’ notice. Tenants can challenge a proposed rent at the First-tier Tribunal; this calculator does not decide the market rent.
Section 13 is the statutory procedure. Form 4A is the current notice for the private assured tenancies covered by this calculator; Form 4 continues to matter for other cases and older notices. Check the official forms page for the form that applies to your tenancy.
There is no percentage from this calculator that certifies an increase as reasonable. Its percentage output only compares the two rents entered. The GOV.UK guidance explains how a tenant can ask the tribunal to determine open-market rent.
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