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Washington's 5% rent difference between month-to-month and fixed-term offers

RCW 59.18.700 limits the rent difference between lease types for the same Washington dwelling unit to 5%, without allowing the annual cap to be exceeded.

Published 2026-07-21 · Updated 2026-07-21 · 839 words

Washington's rent-cap law includes a lease-type parity rule that is easy to miss. For rental agreements offered for the same dwelling unit, the landlord generally may not charge more than a 5% difference in rent based on whether the agreement is month-to-month, another periodic term, or a specified term.

The 5% figure is not an extra increase on top of the annual cap. RCW 59.18.700 says the lease-type difference may not cause the rent for the unit to exceed the ordinary rent-increase limit. Both comparisons can matter.

Compare offers for the same unit

The statutory language focuses on lease or rental agreements the landlord offers for a specific dwelling unit. A market comparison between different apartments is not the same analysis. Keep the written renewal options, dates, unit identity, rent amounts, and material conditions.

A landlord should present alternatives consistently enough to be compared. A renter should preserve the entire offer rather than only a screenshot of one number, because term, timing, fees, and other conditions can affect what is actually being offered.

Calculate the difference

If the fixed-term offer is $2,000 and the month-to-month offer is $2,100, the difference is $100, or 5% of $2,000. A month-to-month offer of $2,120 would be 6% higher. The calculation should use the comparable rent figures for the same unit and offer period.

Recurring charges and materially different conditions can require closer review. The statute also bars terms of payment or other material conditions that are more burdensome based on lease type, subject to its stated exception. Do not inspect the base rent in isolation when the offer changes mandatory terms elsewhere.

Apply the annual cap too

Assume the tenant currently pays $1,850. Even if two new offers are within 5% of each other, either offer can still exceed the annual 2026 cap of 9.683% or violate the first-year rule. Lease parity measures the distance between offers; the annual cap measures the permitted increase from the covered current rent.

The effective date, prior increase history, exemption, notice form, and delivery remain separate. A clean parity calculation is not a complete notice review.

Avoid artificial term penalties

The rule is designed to preserve parity between lease types for the same unit. Landlords should not try to recreate a prohibited rent difference through mandatory monthly fees or more burdensome payment terms attached only to one option. Renters should compare the total recurring obligation and the written conditions.

Legitimate differences in an offer can still require fact-specific analysis. Record the business reason and verify the statutory text before assuming that a fee, deposit, concession, or renewal condition falls outside the rule.

How to review a renewal offer

List every offered term for the same unit in a small table: duration, base rent, recurring charges, due date, payment method, deposit change, and effective date. Calculate the lease-type percentage and the annual increase separately. Then check the notice clock, required form, service, and any exemption.

RentCap asks landlords for the lease-type rent difference when it is relevant and keeps the finding separate in the report. Renters can use the free flow to identify the issue without storing answers. A disputed renewal with additional concessions or conditions may require individualized legal analysis.

Concessions and timing can distort the comparison

A free month, temporary credit, move-in incentive, or delayed effective date can make headline rents difficult to compare. Record the gross recurring rent, the concession terms, and the period over which each offer applies. Do not average away a statutory issue without confirming that the law permits that method.

Offers made on different dates may also reflect a changing legal or factual setting. Keep the communication timeline and identify which alternatives were simultaneously available for the same unit. If a prior option expired before a later one appeared, the parity analysis may require more than subtracting two screenshots. RentCap flags the known percentage but does not decide disputed offer history.

A sample side-by-side review

Create one row for the current agreement and one for each renewal option. Include the term, rent, mandatory recurring charges, due date, payment channel, concession, effective date, deposit change, and deadline to accept. Calculate the annual increase from the current covered rent and the percentage difference between simultaneously offered lease types.

Then mark which facts are identical and which differ. If the month-to-month option costs 5% more but also imposes a new required fee or earlier payment term, the rent-difference calculation may not capture the entire parity concern. Preserve the complete offers so the material conditions can be reviewed.

Landlords can use this table before sending renewals to keep pricing logic consistent across staff and systems. Renters can use it to ask a specific question without rejecting every option. RentCap records the entered percentage and flags the statutory issue, while a contested set of concessions or conditions may need individualized advice.

Official sources

RentCap is a self-help compliance tool, not a law firm. Sources can change; use the linked government text and the site's source changelog for the current verification date.