Section 13 Notice Timing: Two Months' Notice, the New Rent Date, and the 52-Week Rule

The Three Timing Rules

Section 13 of the Housing Act 1988 (as amended by the Renters' Rights Act 2025) sets three timing constraints on a rent-increase notice. Get any one of them wrong, and the notice is void.

1. The two-month rule. The new rent cannot take effect less than two months after the date of service of the notice.
2. The rent-period alignment rule. The new rent must take effect on a day that is the beginning of a rent period.
3. The 52-week rule. The new rent cannot take effect earlier than 52 weeks (53 weeks in some cases) after the date the last increase took effect (s.13(2)(c), (3A)).

These rules apply to private assured tenancies in England from 1 May 2026 (social-housing tenancies let by private registered providers are on a different timetable and still use Form 4). The position in Wales is governed by the Renting Homes (Wales) Act 2016 and is outside the scope of this article.

---

Rule 1: Two Months' Notice

Since 1 May 2026, Section 13 of the Housing Act 1988 (as amended by the Renters' Rights Act 2025, s.6) requires the notice to give a minimum of two months before the new rent can take effect — in all cases, regardless of how the rent is paid. (This replaced the old minimum period in s.13(3), now omitted, which was one month for weekly and monthly tenancies and longer for quarterly and yearly ones.) So if the landlord serves Form 4A on 5 May 2026, the new rent cannot take effect before 5 July 2026, and must then be aligned to the start of a rent period.

This is one of the most common sources of error. Landlords used to the old one-month rule often give too little notice; a Form 4A giving less than two months is void.

---

Rule 2: Rent-Period Alignment

The second constraint is that the effective date has to be the start of a rent period.

If the rent period runs from the 1st of the month, the effective date has to be the 1st of a month. If the rent period runs from the 15th, the effective date has to be the 15th. If the rent runs weekly from Monday, the effective date has to be a Monday.

Mismatches happen in one of two ways:

• The landlord knows the rent date but picks the wrong one. Rent on the 5th, landlord picks the 1st of the next month — invalid.
• The landlord misremembers the rent date. Rent has historically been paid on the 5th, but the original tenancy agreement specified the 1st. The landlord serves on the 1st. Whether this is valid depends on whether the rent period has crystallised on the 5th by conduct, which is fact-sensitive.

The cleanest approach is to look at the original tenancy agreement, then at the rent ledger. If they agree, use that date. If they disagree, get advice before serving.

---

Rule 3: The 52-Week Rule

The interval runs from the date the last increase took effect, not from the date of the last notice: the new rent cannot take effect earlier than 52 weeks (53 weeks in some cases) after that date (s.13(2)(c), (3A)–(3B)). This rule predates the Renters' Rights Act 2025. A notice proposing an earlier date is invalid.

Two situations to watch for:

• First increase on a tenancy: the new rent cannot take effect earlier than 52 weeks after the tenancy began (s.13(2)(b)).
• After a tribunal determination: the 52 weeks run from the date the determined rent took effect (s.13(2)(c)).

The 52-week rule is the rule landlords trip on most often. Calendar it.

---

Worked Example

A landlord has a periodic assured tenancy at £1,400 per calendar month. Rent is paid on the 1st of each month. The landlord wants to increase the rent and serves Form 4A on Tuesday 5 May 2026. The tenancy began in 2024 and the rent has not been increased since, so the 52-week rule is already met.

The earliest effective date that complies with all three rules is:

• Two months from 5 May = 5 July at earliest (Housing Act 1988 s.13 as amended by the Renters' Rights Act 2025 s.6)
• Aligned to rent period (1st of month) = 1 August (the next rent-period start on or after 5 July)

So the earliest valid effective date is 1 August 2026.

If the landlord puts 1 July, the notice is void (less than two months). If they put 5 July, the notice is void (not aligned to the rent period). If they put 1 August, the notice is valid.

The next new rent cannot then take effect earlier than 52 weeks after 1 August 2026 (31 July 2027), so in practice 1 August 2027, the next rent-period start. There is no bar on when the next notice is served; what matters is the effective date.

---

What Each Side Should Do

The Landlord

• Build a calendar. Date of service, plus two months, rounded forward to the next rent-period start. Use that date on the form.
• Check when the last increase took effect. The next new rent cannot take effect earlier than 52 weeks (53 in some cases) after that date.
• Use the prescribed form. Form 4A is the form for private assured tenancies in England from 1 May 2026 (SI 2026/354 reg 3(1)(d)). The old Form 4 is now only for social-housing tenancies.
• Get the prescribed information right. Form 4A includes a section explaining the tenant's right to challenge at the tribunal. Do not edit or remove this. The form has to be served in its prescribed wording.

A rent increase invites a closer look at the property. A tenant challenging Form 4A at the tribunal will bring condition evidence, and any gap in the gas, electrical, EPC or deposit paperwork tends to surface at the same time. ComplyWithMe's landlord compliance checklist for England (2026) runs through what should be in place, and its exposure check shows where a property stands from a postcode and a few answers.

The Tenant

• Check the dates the landlord has used. If the effective date is less than two months from service, the notice is void — you do not even need to go to tribunal. Write back saying so.
• Check the rent-period alignment. If the effective date does not match the start of a rent period, the notice is void.
• Check the 52-week rule. If the proposed date is earlier than 52 weeks (53 in some cases) after your last increase took effect, the notice is invalid.
• If the notice is valid, decide on the tribunal challenge. You have until the day before the new rent takes effect to make an application. See our separate piece on challenging a Form 4A rent increase at the FTT.

---

What "Void" Actually Means

A void Section 13 notice has no legal effect. The new rent does not take effect on the effective date. The tenant continues to pay the existing rent. The landlord cannot recover the increased amount.

If the tenant pays the increased amount under a void notice, that does not validate the notice — and since 1 May 2026 a private landlord cannot raise the rent by side agreement either: the rent can go up only through a valid Section 13 notice (or an agreed lower figure following one) or a tribunal determination (s.13(4A)). s.13(5), which allowed rent to be varied by agreement, has been omitted. So tenants who think a notice is void should write back to the landlord and continue paying the old rent. Do not start paying the new rent and then argue the notice was void.

If the landlord wants to fix the underlying defect, they have to serve a fresh notice. A fresh notice must give at least two months' notice again, so a defective notice usually delays the increase by at least two months.

---

Common Mistakes to Avoid

Landlords.

• Treating the notice period as one month (the old rule) rather than the two months now required by s.13 as amended.
• Using the date of signing rather than the date of service as the trigger for the two-month calculation. Service is when the notice is given to the tenant by a permitted method (one agreed in the tenancy agreement or, if none, handing it over, leaving it at the tenant's address or registered post, as the note on Form 4A explains), not the date the landlord signed it.
• Ignoring the rent-period alignment because the increase is "only on a periodic tenancy". The alignment rule applies to all Section 13 notices.
• Trying to raise the rent through a rent-review clause or an informal agreement instead of Form 4A. For private assured tenancies in England, such clauses have no effect from 1 May 2026 (s.13(4A)).

Tenants.

• Accepting a void notice. If the dates do not work, write back, do not just challenge at tribunal — the notice might be void on the face of it.
• Paying the increased rent under a void notice. It does not make the notice valid; keep paying the old rent and write to the landlord.
• Missing the tribunal application deadline because they were focused on writing to the landlord. The two are not alternatives; do both.

---

The Special Case of Statutory Periodic Tenancies

Under the Renters' Rights Act 2025, every private assured tenancy in England is now periodic. Existing tenancies, including fixed-term ASTs part-way through their term, became periodic ('section 4A') tenancies on 1 May 2026 itself; they did not run on to the end of the fixed term (RRA 2025 s.146). The rent period usually stays as in the original agreement (for example, rent due on the 1st of each month). If the agreement provided for rent periods longer than a month, such as quarterly rent, those terms stopped having effect for periods from 1 May 2026 and the rent period became monthly (Housing Act 1988 s.4A(3), (5), as applied by RRA 2025 Sch 6 para 2). Section 13 notices must align with the rent period that now applies.

---

A Note on the Form Itself

The Form 4A as prescribed by the Assured Tenancies (Private Rented Sector) (Prescribed Forms and Transitional Provisions) (England) Regulations 2026 (SI 2026/354), reg. 3(1)(d) contains a numbered set of prescribed fields. The key fields for timing purposes are:

• Effective date. This is the date you have to get right against all three rules.
• Current rent. State the current rent and how often it is paid (question 4.1); the form asks for both.
• Landlord's signature and date of signing. This is not the date of service — service is a separate act.

Use the prescribed form from the gov.uk catalogue page (gov.uk/guidance/assured-tenancy-forms-for-privately-rented-properties-from-1-may-2026, retrieved 2026-05-11). Do not improvise.

---

What Goes in the Bundle

For a tribunal challenge involving a timing issue, the bundle needs:

• The Form 4A as served (with the dates highlighted)
• Proof of service of the Form 4A — recorded delivery receipt, email confirmation, in-person service note
• The tenancy agreement (showing the original rent and rent period)
• The rent ledger (showing the actual payment dates)
• Evidence of when any previous increase took effect (to test the 52-week rule)
• A brief witness statement setting out the timing point

If the timing point is clear-cut, the tribunal may decide on the papers, but only if the parties consent or do not object within 28 days of being told it intends to do so (rule 31, SI 2013/1169). If the case turns on factual disputes (was rent really being paid on the 5th rather than the 1st?), an oral hearing is more likely.

---

BundleCreator's tenancy-variation area at /tenancy-variation helps you organise the Form 4A as served, proof of service, your evidence and witness statements into an indexed bundle for the First-tier Tribunal (Property Chamber). The notice itself must be the official Form 4A from GOV.UK.

Nothing in this article is legal advice or a substitute for it. The information here describes the law as it stands at the date shown; the law and procedure may change. For independent advice at no cost, contact Citizens Advice, Shelter England, your local Law Centre, or the Housing Loss Prevention Advice Service (which is available without charge to any tenant served a Section 8 notice). The Tribunal Procedure (First-tier Tribunal) (Property Chamber) Rules 2013 (as amended) apply to rent-determination applications.