Rent Increase Calculator (UK)
The new rent, the increase in percentage terms, and the earliest lawful date.
New monthly rent
£1,155
Increase per month
£55
Increase per year
£660
Earliest effective date
18 October 2026
Assumes notice served today with the full statutory notice period.
Increase size
5.00%
Increases well above local market movement are the most likely to be challenged at tribunal.
What this calculator tells you
Under the Renters' Rights Act 2025 all assured tenancies are periodic and rent may be increased once a year, by notice, to no more than the market rate. The tenant can refer the proposed rent to the First-tier Tribunal, which can confirm or reduce it but — importantly under the new regime — cannot set it higher than the landlord proposed. Getting the notice, the timing and the evidence right is what makes an increase stick.
How it works
- 1Multiply the current rent by (1 + the percentage increase).
- 2Rent may only be increased once in any 12-month period.
- 3At least two months' notice must be given, using the prescribed form.
- 4The new rent takes effect on the date stated in the notice unless the tenant applies to the tribunal before then.
Worked example
Raising £1,100 by 5%
- £1,100 × 1.05 = £1,155 per month.
- That is £55 more per month, or £660 a year.
- Serve the prescribed notice giving at least two months.
- Keep three comparable local listings on file as evidence of market rate.
A 5% rise supported by comparable evidence is straightforward to defend. A 20% rise with no evidence is an invitation to a tribunal referral.
Frequently asked questions
How often can I increase the rent?
Once every 12 months on an assured periodic tenancy, by serving the prescribed notice giving at least two months before the new rent takes effect.
Can a tenant challenge a rent increase?
Yes. The tenant may refer the proposed rent to the First-tier Tribunal before the effective date. The tribunal determines the open market rent and, under the Renters' Rights Act 2025, cannot award more than the landlord asked for.
Can I still use a rent review clause?
Rent review clauses that bypass the statutory notice route are of no effect on assured tenancies under the new regime. Use the statutory notice process.
Related content
These calculators give general estimates for UK private landlords and letting agents, not legal, tax or financial advice. Figures depend on your circumstances and on the rules in your part of the UK — check the detail or take advice before acting.