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RCW § 59.18.200

Washington Prorated Rent Calculator & Legal Guide

Statutory guidelines for prorating rent in Washington. Understand 20-day termination notices, security deposit return rules, and tenant protections.

Washington Rent Calculator

Calculate move-in or move-out proration configured for Washington.

WA Notice Rules
$
Calculated Amount Actual Days Formula
Total Prorated Rent Due
$750.00
Apportioned for occupied tenancy period
Daily Rent Rate $50.00 / day
Billable Tenancy 15 / 30 Days
Monthly Savings $750.00
Statutory Status Compliant
Tenancy Calendar
Occupied (Billed) Vacant (No Rent)
SunMonTueWedThuFriSat
Step-by-Step Calculation Proof
Monthly Rent: $1,500.00
Billing Cycle: 30 Days
Days Charged: 15 Occupied Days
Daily Rate: $1,500.00 ÷ 30 = $50.00 / day
Formula: $1,500.00 ÷ 30 × 15 = $750.00
Total Prorated Rent Due: $750.00
Compare Proration Methods Method Guide & Rules →
Accounting Method Daily Rate Prorated Rent Variance vs Actual
Actual Calendar Days $50.00 $750.00 Baseline ($0.00)
30-Day Method $50.00 $750.00 $0.00
365-Day Annual Formula $49.32 $739.73 -$10.27
💡 Why numbers differ: Actual Days uses exact month length (28–31). 30-Day standardizes to 30. 365-Day computes annualized rate.
🔍 Check Landlord's Math
State Statute Summary

Washington Legal Snapshot

  • Statutory Code: RCW § 59.18.200
  • Required Notice: 20 Calendar Days
  • Deposit Return Deadline: 30 Days
  • Standard Method: Actual Calendar Days

Generate Rent Statement

Create an itemized proration worksheet with Washington tenancy dates for mutual lease settlement.

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Washington Rent Apportionment & Landlord-Tenant Codes

Statutory Summary: RCW § 59.18.200

Tenant must give 20 days notice before end of monthly cycle. Just cause eviction protections apply.

General Washington Rental Guidelines

In Washington, the calculation method for prorated rent is primarily governed by the written lease contract. Applicable state statutes (including RCW § 59.18.200) establish required notice periods for terminating month-to-month tenancies and statutory deadlines for security deposit reconciliation.

Official Sample Notice & Proration Settlement Template:

"To: [Landlord / Property Management Name]
Property Address: [Your Full Rental Address]

Please accept this letter as formal written notice pursuant to RCW § 59.18.200 that I will vacate the premises on [Move-Out Date]. As our rental cycle ends on [Cycle End Date], my lawful tenancy for this final period spans exactly [Number of Days] days. Based on our monthly rent of $[Monthly Rent] and our state's calendar apportionment standards, the final prorated rent due is $[Calculated Amount]. Please direct my remaining security deposit of $[Deposit Amount] pursuant to state deposit return statutes within 30 Days to my forwarding address below.

Forwarding Address: [Your New Address]
Tenant Signature: _______________________ Date: ____________"

Legal & Informational Disclaimer:

The statutory summaries, notice durations, and deposit refund deadlines provided for Washington are compiled from public state legislative codes (including RCW § 59.18.200) for general computational reference. Local municipal rent stabilization ordinances (such as city rent control boards) may impose additional local restrictions. This tool provides mathematical rent apportionment and does not constitute formal legal counsel. For specific lease disputes, consult an attorney licensed in Washington or your local legal aid society.

Frequently Asked Questions: Washington Rent Proration

If you have a fixed-term 12-month lease that ends on the last day of the month and you choose to leave early without landlord consent, you are generally liable for full rent until a new tenant moves in or the term expires. However, if you are on a month-to-month tenancy and provide a lawful 20-day notice under RCW § 59.18.200, you are only legally liable for rent through the expiration date of your notice.

Under Washington statutes, landlords must return your security deposit within 30 Days following key surrender, along with an itemized accounting of any deductions made for unpaid rent or lawful repairs beyond normal wear and tear.