Washington Security Deposit Law: An Owner's Guide

A security deposit is a refundable payment collected at the start of a tenancy to protect the owner against unpaid rent, damage beyond ordinary wear, and other lease violations. In Washington State, security deposits are governed by RCW 59.18.260 through RCW 59.18.285.

A deposit is only enforceable if the lease is in writing and a signed move-in checklist documents the unit's condition. The deposit must be held in a trust account, and within 30 days of move-out the owner must return the deposit or send an itemized statement with documentation supporting every deduction.

There is no statewide cap on deposit amounts, but Seattle limits total move-in costs to one month's rent.

Washington tightened its deposit rules in July 2023. The return deadline moved from 21 days to 30 days, and in exchange the documentation standard became much stricter.

Owners who still run their deposit process the way they did before 2023 are the ones losing deposit disputes today. This guide covers the current rules, what changed, and how to stay on the right side of them.

This post is part of our Washington lease compliance series. It is general information for property owners, not legal advice. For an active dispute, involve a landlord-tenant attorney.

What Washington Requires Before You Collect a Deposit

Under RCW 59.18.260, you cannot legally collect a security deposit unless two things are in place:

• A written rental agreement that spells out the terms and conditions under which any portion of the deposit may be withheld.
• A written move-in checklist, signed and dated by both you and the tenant, specifically describing the condition and cleanliness of the unit, including walls and paint, carpets and other flooring, furniture, and appliances. The tenant gets a copy and has the right to one free replacement copy.

This is not a formality. If you collect a deposit without providing the signed checklist, you are liable to the tenant for the full amount of the deposit, plus court costs and attorney fees.

The checklist also determines what you can deduct later; damage to an item that was never documented at move-in generally cannot be charged against the deposit. A thorough move-in condition report with photos is the foundation of every defensible deduction.

Where the Deposit Must Be Held

RCW 59.18.270 requires every security deposit to be promptly placed in a trust account at a Washington financial institution or with a licensed escrow agent. The deposit cannot sit in your personal checking account or mix with the property's operating funds.

You must give the tenant a written receipt for the deposit and written notice of the name, address, and location of the depository, and notify them again if it changes.

Unless your lease says otherwise in writing, any interest earned on the trust account belongs to you as the owner.

How Much Should You Charge?

Washington has no statewide cap on deposit amounts. One month's rent is the most common benchmark in the Puget Sound market.

The practical constraint is affordability at move-in: requiring first month, last month, and a full deposit prices out well-qualified applicants and extends your vacancy. Set the deposit high enough to matter and low enough that the home leases quickly.

Seattle is the exception. The city caps total move-in charges, including the deposit and any nonrefundable fees, at one month's rent, and requires owners to offer installment payment plans.

Several cities cap move-in costs too: Kirkland, Kenmore, Shoreline, and Auburn all limit move-in fees plus deposits, including pet deposits, to one month's rent, and unincorporated King County does the same. Check your city before setting the amount.

Where no local cap applies, payment plans are optional. If you offer one, document it fully in the lease and offer it on the same terms to every applicant who qualifies.

Nonrefundable Fees Are Not Deposits

RCW 59.18.285 draws a hard line: money that is nonrefundable may not be called a deposit, and a nonrefundable fee is only enforceable if the written rental agreement clearly states it is nonrefundable.

If the lease does not say so, the law treats that money as a refundable deposit, with all the trust account and 30-day return obligations that follow.

Pet Deposits, Pet Rent, and Assistance Animals

You may charge a separate pet deposit in Washington, and the same rules apply to it: written agreement, trust account, move-in documentation, and the 30-day return clock.

In our experience at Sagareus, pet rent serves owners better than a large pet deposit. With a deposit, the burden is on you to prove the pet caused the specific damage; pet rent compensates you for the added wear without that fight. Allowing pets widens your applicant pool considerably, so the goal is pricing the risk, not avoiding it.

One critical Fair Housing point: service animals and emotional support animals are not pets. You may not charge a pet deposit, pet rent, or pet fees for an assistance animal, and you may not deny an otherwise qualified applicant because of one.

The 30 Day Clock After Move-Out

Within 30 days of the tenancy ending and the tenant vacating (or within 30 days of learning the tenant abandoned the unit), RCW 59.18.280 requires you to deliver two things: a full and specific statement of the basis for keeping any portion of the deposit, and the refund of whatever remains.

Mailing the statement and refund first class to the tenant's last known address within the 30 days satisfies the deadline.

Since July 2023, the statement alone is not enough. You must attach documentation for every deduction:

• Copies of estimates received or invoices paid for repair work.
• If you or your employees do the repairs, a statement of the time spent and the reasonable hourly rate charged.
• If you use materials you already had on hand, a bill, receipt, or vendor price list that documents the cost of what was used.

What You Cannot Deduct

The statute now lists deductions that are off limits no matter what your lease says:

• Ordinary wear. Wear resulting from normal use of the unit is never deductible. Knowing the difference between wear and damage is where most deposit disputes are won or lost.
• Routine carpet cleaning. Carpet cleaning is deductible only if you document wear beyond ordinary use.
• Undocumented items. Repair or replacement of fixtures, equipment, appliances, or furnishings whose condition was not documented in the move-in checklist.
• Overcharging on partial damage. If only part of an item is damaged, you cannot charge more than the cost of repairing or replacing the damaged portion.

What Happens If You Miss the Deadline

Miss the 30-day window, or skip the required documentation, and the consequences are severe. You become liable to the tenant for the full deposit and you are barred from asserting any claim against it.

If a court finds the failure intentional, it can award the tenant up to twice the deposit, and the prevailing party recovers court costs and attorney fees. A late statement usually means a total forfeit, even when the underlying damage was real.

When Damage Exceeds the Deposit

The deposit is not your ceiling. Washington law preserves your right to pursue the tenant for documented damage beyond the deposit amount, through small claims court or collections with counsel.

The same documentation standard applies: amounts for ordinary wear, or amounts you cannot substantiate with invoices and records, cannot be charged to the tenant or sent to collections. Disciplined documentation throughout the tenancy is what makes recovery possible.

How Sagareus Handles Security Deposits

Hold the deposit in a trust account, document everything, and refund inside Washington's deadline every single time. A deposit is the resident's money until you can prove otherwise, so we treat it that way from day one. It is held separately from operating funds, exactly as Washington law requires.

When a resident moves out, every deduction has to earn its place. Here is the standard we hold ourselves to:

• Charge for damage, never for ordinary wear. Deterioration from normal living is your cost of doing business under Washington law; damage from negligence or abuse is the resident's.
• Back every deduction with proof. The move-in baseline, the move-out condition, and a real vendor invoice, or it does not go on the statement.
• Send the itemized statement and refund inside the legal deadline. We build in our own buffer so it is never close.

We would rather drop a marginal charge than risk the whole dispute over it. The deductions that remain are the ones we can prove, which is exactly why they hold.

You get paid for true damage. The resident gets a fair, documented accounting. Nobody ends up in small claims.

Related Sagareus Services:

• Tenant Screening Services
• Property Inspections