Washington Annual Rent Increase Ceiling Calculator — HB 1217 & CPI-U Compliance (2026)

Understanding HB 1217: Washington’s Rent Increase Cap

In July 2019, Washington State enacted House Bill 1217 (codified primarily in RCW 59.18.140), which fundamentally changed how landlords in Washington can raise rents. For nearly 40 years before this law, Washington had no statewide rent control. Today, it does—but only on the annual increase side, not on absolute rent levels.

HB 1217 applies to all residential tenancies of 12 months or longer, with limited exceptions. It does not apply to:

• Properties that are newly constructed (rent increases are uncapped for the first five years after initial occupancy)
• Single-family homes rented for the first time after January 1, 2019 (until a second tenant occupies the unit)
• Certain subsidized housing programs where another law sets the rent
• Properties occupied by the landlord (owner-occupied duplexes, triplexes, and fourplexes—only if the owner occupies one unit)

If your property falls outside these exemptions, you must comply with the cap or face liability.

The HB 1217 Formula: 7% or CPI-U, Whichever Is Lower

The statute itself is straightforward. RCW 59.18.140(1) states that a landlord may not increase the rent paid by a tenant in writing more than once in any 12-month period, and the increase cannot exceed “the greatest of: (a) The percentage increase in the consumer price index for all urban consumers (CPI-U)…as most recently published by the Bureau of Labor Statistics; or (b) Seven percent.”

In practice, this means:

Scenario	Allowable Increase
CPI-U is 2%	7% (the cap)
CPI-U is 5%	7% (the cap)
CPI-U is 8%	8% (CPI-U exceeds the 7% ceiling)
CPI-U is 10%	10% (CPI-U exceeds the 7% ceiling)

You can never exceed the greater of these two figures. If CPI-U is 3.2%, the maximum increase is 7%. If CPI-U is 8.9%, the maximum increase is 8.9%.

Which CPI-U Figure Do You Use?

This is where many self-managing landlords make mistakes. The statute references “as most recently published by the Bureau of Labor Statistics,” but does not specify the exact month or reporting period.

The Washington State Attorney General’s office and housing advocates have clarified that you should use the 12-month CPI-U increase that was published most recently before you serve notice of the rent increase.

Here’s the practical timeline:

• BLS publishes CPI-U data monthly, typically around the 10-13th of the following month
• July 2026 data (covering June 2025 to June 2026 year-over-year) was released August 13, 2026
• If you serve a 60-day notice in August 2026, you use the July 2026 CPI-U figure (12-month increase)
• The increase takes effect 60 days after notice is served, meaning January 1, 2027 for August 2026 notice

Do not invent your own CPI-U figure or use local inflation data. Use only the official 12-month percentage change published by the U.S. Bureau of Labor Statistics for CPI-U. You can find this at bls.gov/cpi.

Step-by-Step Compliance Checklist for 2026–2027 Rent Increases

Step 1: Verify Your Property Is Subject to HB 1217

Before any calculation, confirm your property does not fall into an exemption. Ask yourself:

• Was this a newly constructed building first occupied after January 1, 2019? If yes, is this the tenant’s first year of occupancy?
• Is this a single-family home, and is this the first tenancy after January 1, 2019?
• Do I live in one unit (owner-occupied duplex, triplex, or fourplex)?
• Is the rent subsidized by a government program with its own rent-setting rules?

If you answered “yes” to any of these, document this determination. Tenant advocates will challenge you if you claim an exemption, and the burden is on you to prove it applies.

Step 2: Determine the Correct CPI-U Figure

As of August 2026, the most recent 12-month CPI-U figure available is 2.9% (July 2026 data, released August 13, 2026). For any rent increase notice served in August 2026, you use 2.9%. For notices served in September 2026 or later, you’ll use the September 2026 CPI-U figure (released October 2026).

Action: Visit bls.gov/cpi and locate the “Average Energy Prices” table under “All items in U.S. city average, all urban consumers.” Note the 12-month percentage change (not seasonally adjusted).

Step 3: Calculate the Maximum Allowable Increase

Apply the formula:

Maximum Increase = Greater of (CPI-U % or 7%)

Example: If CPI-U is 2.9%, your maximum increase is 7% (because 7% is greater than 2.9%).

If the tenant’s current rent is $1,200/month:

• $1,200 × 0.07 = $84
• New rent = $1,284/month

Never exceed this figure. Even if you believe you deserve more due to market conditions, inflation in your specific building costs, or property tax increases, HB 1217 does not allow exceptions for landlord hardship or cost-of-living increases.

Step 4: Draft and Serve the 60-Day Notice

RCW 59.18.140(2) requires that any rent increase must be preceded by a written notice of at least 60 days. This means:

• Notice must be in writing (email to a tenant email address on file is acceptable; a text is not)
• 60 days means at least 60 calendar days, not business days
• The notice must clearly state the new rent amount, the effective date, and the reason for the increase
• You must use proper service methods (in-person, certified mail, or first-class mail)

Include in the notice:

• The current rent amount
• The new rent amount
• The effective date (at least 60 days from service)
• A statement that this increase complies with RCW 59.18.140, citing the CPI-U figure used
• Your contact information for questions

Example language:

“Notice of Rent Increase: Your current monthly rent of $1,200 will increase to $1,284 effective January 1, 2027. This increase of 7% is permitted under Washington State law (RCW 59.18.140) and does not exceed the greater of the Consumer Price Index for All Urban Consumers (currently 2.9%) or seven percent (7%).”

Step 5: Document Everything

Keep a record file for each tenant containing:

• Date and method of notice service
• Proof of delivery (certified mail receipt, email read receipt, or affidavit of in-person service)
• The CPI-U figure used and the source (bls.gov and publication date)
• The calculation: old rent × applicable percentage = new rent
• A copy of the notice as delivered

This documentation protects you if a tenant later claims you violated HB 1217. If sued, you’ll need to prove you followed the formula and gave proper notice.

Common Compliance Mistakes and How to Avoid Them

Mistake 1: Using the Wrong CPI-U Figure or Making One Up

Some landlords use “national inflation” estimates or local real estate price indices. These are not CPI-U. Others reference inflation figures from news articles without verifying the exact 12-month percentage from BLS. This will expose you to liability.

Fix: Always download the official CPI-U data from bls.gov. Cite the month and year of the data and the specific percentage in your notice.

Mistake 2: Serving Notice with Insufficient Time

A 59-day notice is not sufficient. RCW 59.18.140(2) requires “at least 60 days.” Courts interpret “at least” strictly. If you serve notice on August 1, 2026, the earliest effective date is October 1, 2026 (61 days later).

Fix: Count forward 61 calendar days from the date you serve notice to determine the earliest effective date. Use an online date calculator if necessary.

Mistake 3: Applying Increases More Than Once Per 12 Months

The statute says “the landlord may not increase the rent paid by a tenant in writing more than once in any 12-month period.” Many landlords think this means they can increase rent once per calendar year (January), but it actually means once per 12-month period from the date of the previous increase.

Fix: Track the anniversary date of the previous rent increase. You cannot legally increase rent again until 12 months have passed from that date.

Mistake 4: Failing to Account for Lease Renewals vs. Month-to-Month Tenancies

HB 1217 applies to both lease renewals and month-to-month tenancies. When a lease term ends, if you and the tenant agree to renew or continue the tenancy (even implicitly by accepting continued rent payments), the new period is subject to the cap. You cannot sidestep the law by terminating a lease and offering a new one at a higher rate. Courts view this as an unlawful evasion of the rent cap.

Fix: Treat lease renewals the same as month-to-month increases: provide 60 days’ notice and comply with the percentage cap.

Mistake 5: Not Providing Notice in Writing

Verbal notices do not satisfy RCW 59.18.140(2). One landlord told a tenant in person that rent would increase, but the tenant disputed the conversation later. The lack of written documentation cost the landlord in a dispute resolution proceeding.

Fix: Always serve written notice via email (to an email address the tenant has provided) or first-class/certified mail. Keep proof of delivery.

Legal Consequences for Non-Compliance

Tenant Rights Under HB 1217

If you violate the rent cap or notice requirements, RCW 59.18.140(3) allows a tenant to:

• Recover the overcharged rent amounts (the difference between what you charged and what the law allowed)
• Recover court costs and reasonable attorney fees (if the tenant wins or if you challenged them unfairly)
• Pursue an unlawful practice complaint with the Washington State Attorney General

Unlike some other landlord-tenant violations, there is no statutory cap on damages. If you illegally increased rent by $200/month for a year, the tenant can sue for $2,400 in overages plus attorney fees that could easily exceed $5,000–$10,000.

Attorney General Enforcement

Washington’s Attorney General’s office has investigated and settled cases against landlords who violated HB 1217. In 2022, the AG obtained a settlement with a property management company for illegally increasing rents above the cap. The company agreed to repay tenants and pay a penalty. Smaller operations are not exempt from enforcement.

Special Situations and Edge Cases

What if the Tenant Proposes Paying More Than the Cap?

This does not override HB 1217. You cannot contract around the cap. Even if a tenant verbally agrees to pay $1,400/month when the law allows only $1,284, that agreement is unenforceable. If you accept the higher amount, the tenant can sue you for the difference.

What if You Raise Rent Before January 1, 2027, but the Increase Takes Effect in January 2027?

Use the most recent CPI-U figure at the time you serve notice, not at the time the increase takes effect. If you serve notice in December 2026 for a January 2027 increase, you use the November 2026 CPI-U figure (released December 2026), not the January 2027 figure.

What About Utilities or Other Pass-Through Charges?

HB 1217 applies to “rent,” which is defined in the lease as the regular monthly housing payment. If you separately bill utilities and the tenant is responsible, changes to utility charges are not subject to the rent cap. However, if utilities are included in the rent figure stated in the lease, any increase to total occupancy cost is subject to the cap. Consult your lease language.

Multi-Unit Buildings: Can You Raise Different Tenants’ Rents by Different Amounts?

Yes, as long as each increase complies individually. One tenant in a 10-unit building might receive a 5% increase (if their lease allowed less), while another receives 7%. The cap applies per-tenant, not per-building. However, be aware that large rent disparities within the same building can trigger tenant complaints and scrutiny from tenant advocacy groups and the Attorney General.

Understanding the CPI-U: What It Measures and Why It Matters

CPI-U stands for Consumer Price Index for All Urban Consumers. It measures the average change over time in prices paid by urban consumers for a fixed basket of goods and services, including food, transportation, housing, utilities, and more.

The Bureau of Labor Statistics publishes CPI-U monthly for various geographic regions. For HB 1217 compliance, you must use the 12-month change in the U.S. city average CPI-U, not regional or seasonal variants.

As of July 2026, the 12-month CPI-U increase is 2.9%. This reflects the change from June 2025 to June 2026. It is significantly lower than the 8%+ inflation rates seen in 2021–2022, which is why the 7% cap is now the binding ceiling for most rent increases.

CPI-U data is published publicly at www.bls.gov/cpi. You do not need to subscribe to any service or pay for data access.

Documentation Template for Your Records

Use this template to document each rent increase for compliance verification:

Item	Details
Tenant Name	___________________
Property Address	___________________
Date of Notice Service	___________________
Method of Service	Email / Certified Mail / In-Person
Proof of Delivery Date	___________________
Current Rent Amount	$ ___________________
New Rent Amount	$ ___________________
Dollar Increase	$ ___________________
Percentage Increase	__________% (must be ≤ 7% or CPI-U)
CPI-U Figure Used	__________% (month/year: ___/___)
BLS Publication Date	___________________
Effective Date of Increase	___________________
Days Between Notice and Effective Date	__________ days (must be ≥ 60)

How to Stay Current on CPI-U Changes

The CPI-U figure changes monthly, and so does the maximum allowable rent increase. To avoid mistakes:

• Subscribe to BLS email alerts at bls.gov/bls/news-release/archives.htm to receive notification when new CPI-U data is released
• Check bls.gov/cpi the day after the expected release date (usually the 13th of each month) to confirm the latest figure
• Maintain a spreadsheet of CPI-U figures by month so you have a historical record if a tenant disputes your calculation years later
• If using property management software or compliance tools, verify that rent increase features use the current BLS data, not outdated or estimated figures

Frequently Asked Questions

Q: Can I increase rent by a portion of the 7% cap in one year and carry over the remaining portion to the next year?

No. Each 12-month period is independent. If CPI-U is 2.9% and you increase rent by only 4%, you cannot increase it by an additional 3% the following year. The following year, you can increase by up to 7% or the new CPI-U figure, whichever is greater—completely separate from the prior year.

Q: Does HB 1217 apply if I own the property as an LLC or corporation?

Yes. The statute applies to all landlords, regardless of business structure. An LLC or corporation that owns residential property in Washington must comply with the rent cap.

Q: What if a tenant’s lease says “Rent may be increased each year by 3% or CPI-U, whichever is greater”? Can I follow the lease language instead of HB 1217?

No. HB 1217 supersedes lease language. Even if your lease allows unlimited increases or higher percentage increases, the law caps it at the greater of 7% or CPI-U. Any lease language conflicting with HB 1217 is unenforceable.

Q: I accidentally served only 59 days’ notice. Can the tenant still move out if the rent increase takes effect?

The tenant can refuse to pay the increase and potentially dispute it. If you try to evict for non-payment based on an illegally noticed increase, a court will likely dismiss the case. The tenant could also sue you for attempting to enforce an invalid notice. Serve the proper 60 days in the future.

Q: If CPI-U goes negative (deflation), does that mean I have to lower rent?

HB 1217 addresses increases, not decreases. If CPI-U is negative, you are capped at 0% increase (meaning you cannot raise rent), but you are not required to lower it. The statute does not mandate rent reductions.

Q: Can I charge a “market rate adjustment” fee or any other charge to compensate for lost rental growth due to the cap?

No. Any additional charge designed to circumvent or offset the rent cap would likely violate HB 1217. Charges must be separate from rent (e.g., pet deposits, late fees with proper statutory limits) and cannot be framed as a way to recoup “lost” rent growth. Do not attempt to structure workarounds; they expose you to legal liability and tenant complaints.

Linking Compliance to Operational Efficiency

Tracking rent increases, serving notices, and maintaining documentation manually across multiple units is error-prone, especially when CPI-U figures change monthly. Many self-managing landlords use spreadsheets, which can lead to miscalculations or missed notice deadlines.

A compliance-focused operations platform that integrates with your lease data can:

• Alert you when it’s time to serve a rent increase notice (based on your tracking of the last increase date)
• Pull the current CPI-U figure and suggest the maximum allowable increase
• Generate compliant notice templates with the proper language and calculation
• Record the date and method of notice service
• Flag properties that are subject to HB 1217 vs. those with exemptions
• Generate reports showing compliance history for audits or disputes

This reduces the cognitive load and eliminates the most common mistakes. For landlords managing 10, 25, or 50+ units, compliance tools that centralize lease operations, rent payment tracking, and compliance scheduling can mean the difference between confident, defensible increases and costly legal disputes.

Recent Changes and 2026 Outlook

As of July 2026, HB 1217 remains unchanged. There are no pending legislative changes to the rent cap formula or notice requirements. However, tenant advocacy groups continue to push for:

• Lowering the cap below 7%
• Extending protections to month-to-month tenancies beyond 12 months (currently some ambiguity)
• Tightening exemptions (especially the “new construction” exemption)

As a self-managing landlord, monitor legislative sessions (typically January–April) for proposed bills. Compliance tools that send legislative alerts can help you adapt quickly if the law changes.

Ensuring Documentation Survives Tenant Disputes

If a tenant sues you for violating HB 1217, your documentation becomes your defense. Courts expect to see:

• A copy of the notice as served (not a draft or template, but the actual notice sent)
• Proof of service (certified mail receipt, email timestamp, or affidavit)
• The CPI-U figure and its source (printout from bls.gov with publication date)
• The calculation showing the rent amount × percentage = new rent
• Lease or tenancy agreement showing the prior rent amount

If you cannot produce these items, you lose credibility even if you were compliant. Judges assume worst-case scenarios when documentation is missing. Keep all records for at least the duration of the tenancy plus three years (statute of limitations for contract disputes in Washington is six years, but three years is prudent).

State-Level Tenant Protections and Retaliation

Washington law also prohibits retaliatory conduct by landlords. RCW 59.18.240 states that a landlord cannot increase rent (or decrease services, or threaten eviction) in retaliation for a tenant’s good-faith exercise of rights, such as:

• Complaining to a housing authority or the Attorney General
• Requesting repairs for habitability defects
• Joining a tenant union or organization

If you increase rent shortly after a tenant complains about a habitability issue or files a complaint with authorities, the tenant can argue retaliation. Even if the increase is technically compliant with HB 1217’s percentage cap, the timing and context can expose you to a retaliation claim. Allow a buffer of several months between major tenant complaints and rent increases when possible, and document your non-retaliatory intent.

Final Compliance Checklist Before Serving Notice

Use this checklist to verify compliance before serving any rent increase notice:

• ☐ Confirmed the property is subject to HB 1217 (not newly constructed, not owner-occupied exempt, not subsidized)
• ☐ Confirmed at least 12 months have passed since the last rent increase for this tenant
• ☐ Obtained the current 12-month CPI-U from bls.gov and noted the source and publication date
• ☐ Calculated the maximum allowable percentage (greater of CPI-U or 7%)
• ☐ Calculated the new rent amount and dollar increase
• ☐ Drafted notice in writing with clear language stating the calculation method and CPI-U figure
• ☐ Chose effective date at least 60 days from the date of notice service
• ☐ Served the notice via email, first