Rent Reeve — Rent increases and rent collection rules | rentreeve.com
An increase is valid only if it is written, served enough days ahead, and timed to land on the rent cycle.
The baseline across jurisdictions is 30 days' written notice for a month-to-month tenancy shorter than one year, effective on the next rent cycle. The clock runs from service of the notice to the first day of the rental period in which the new rent would be charged.
Larger increases and longer-tenured tenants stretch the requirement. Many jurisdictions demand 60 or 90 days in those cases, and California fixes the longest tier by statute: an increase above 10% within 12 months needs 90 days' written notice, while 10% or less needs 30, under Civil Code section 827.
Counting is done backward from the rent cycle. If rent is due on the first of the month and the new figure should apply from 1 October, a 30-day notice must be served by 1 September; served on 5 September, the increase slides to 1 November rather than taking effect mid-October.
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The notice itself must be in writing and should state the current rent, the new rent, and the effective date. A verbal mention, a phone call, or a text message starts no clock at all, and the tenant who keeps paying the old rent after a verbal warning is not in arrears.
Typical defects have names among practitioners: the short count (served inside the window), the mid-cycle landing (effective mid-period), the overshoot (above the local cap), and the second bite (a second increase inside 12 months without written agreement). Each makes the increase uncollectable until corrected.
For the cap check that precedes the day count, see Rent Increase Limits: Who Caps What; for the fees that follow a missed payment after a valid increase, see Late Fees, Grace Periods and Deposits.
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