Mercer Island Late Fee Calculator (2026) — Free
Charge above Washington's late fee limit and it's void in court. Calculate your maximum legal late fee, grace period, and compliant collection process.
Calculate Your Late Fee Limits
Results for Mercer Island, WA
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result
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deadline / notice
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penalty if violated
Mercer Island Late Fee by Unit Size
Here are the amounts at Mercer Island's current Fair Market Rents:
| Unit Size | Median Rent | Max Late Fee | Grace Period |
|---|---|---|---|
| Studio | $2,074/mo | Reasonable | 5 |
| 1-Bedroom | $2,146/mo | Reasonable | 5 |
| 2-Bedroom | $2,501/mo | Reasonable | 5 |
| 3-Bedroom | $3,272/mo | Reasonable | 5 |
| 4-Bedroom | $3,847/mo | Reasonable | 5 |
Rents based on HUD Fair Market Rents (FY2026) for King County.
Penalty Warning
Violating Washington rules in Mercer Island can result in penalties, voided actions, and tenant lawsuits. Courts consistently side with tenants on procedural technicalities.
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For the full breakdown of rules, deadlines, and procedures, see our Mercer Island Late Fee Limits guide.
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Reviewed by Rachid Abadli
Founder & CEO, LeaseBase · Sacramento landlord · Self-managing since 2019
LeaseBase is a property management platform — not a law firm. Consult an attorney for legal advice specific to your situation.
