Oregon Rent Increase Limits & CPI Calculation — Complete Compliance Guide (2026)

Understanding Oregon's Rent Increase Cap: ORS 90.323(2) Overview

Oregon is one of only a handful of states with a statewide rent control statute that directly ties allowable increases to Consumer Price Index data. Unlike price controls in other states that freeze rents or allow only nominal increases, Oregon's approach is economically indexed—meaning the ceiling moves annually based on inflation measures published by the U.S. Department of Labor.

Under ORS 90.323(2), a landlord may increase rent only by the amount of inflation as measured by the Consumer Price Index for the Portland-Salem-Vancouver metropolitan area. This statute applies to virtually all residential tenancies in Oregon, with only narrow exceptions for owner-occupied properties with four or fewer units and some subsidized housing arrangements.

The critical distinction: This is not a ban on rent increases. You are explicitly allowed to raise rent up to the CPI ceiling. But you cannot exceed it. The law does not permit you to increase rent based on market demand, property improvements, or rising costs. The CPI number is the hard cap.

Self-managing landlords often underestimate this requirement's complexity. The statute requires:

• Identifying the correct CPI index for your unit's location
• Obtaining and calculating the 12-month average CPI increase
• Applying that percentage only to rent that has not increased in the past 12 months
• Providing 90-day written notice before the increase takes effect
• Documenting your calculation methodology

Failure in any step exposes you to tenant litigation. Oregon courts enforce rent control violations aggressively, and the statutory damages structure heavily favors tenants.

Which CPI Index Applies to Your Property?

Oregon's statute specifies the Portland-Salem-Vancouver metropolitan area Consumer Price Index as the controlling benchmark. This is the U.S. Department of Labor's Consumer Price Index for All Urban Consumers (CPI-U) for the Portland-Salem-Vancouver-Hillsboro, OR-WA Metropolitan Statistical Area (MSA).

The BLS publishes this data monthly, with historical data available at bls.gov under the heading "Average Energy Prices" and regional CPI reports. The specific series ID you need is APUS49749318 (or search the BLS database for "Portland-Salem-Vancouver All items").

Geographic Application: Does Your Unit Fall Under the Portland-Salem-Vancouver Index?

The statute's language is "the Consumer Price Index for the Portland-Salem-Vancouver area." The BLS defines this MSA to include:

• Clackamas County, OR
• Columbia County, OR
• Marion County, OR
• Multnomah County, OR
• Polk County, OR
• Washington County, OR
• Yamhill County, OR
• Clark County, WA
• Skamania County, WA

If your rental property is located within this nine-county/two-state region, you use the Portland-Salem-Vancouver CPI. If your property is in Bend, Eugene, Medford, or other Oregon cities outside this MSA, the statute's application is ambiguous. Oregon courts and the Bureau of Labor and Industries (BOLI) have not issued binding guidance on which CPI index applies to properties outside the Portland-Salem-Vancouver MSA.

In practice, landlords with properties outside the defined MSA face two compliant approaches:

1. Use the Portland-Salem-Vancouver index anyway — The statute names only this index; applying it uniformly across the state is a defensible interpretation.
2. Use the nearest regional CPI index — For example, use the Seattle-Tacoma-Bellevue index for properties in Oregon's northern border counties, or the San Francisco Bay Area index for southern Oregon. This approach is less settled legally but arguably more equitable.

The safest compliance practice if you own properties outside the Portland-Salem-Vancouver MSA: Document your methodology in writing before the rent increase notice is issued, retain that documentation, and be prepared to explain your reasoning to BOLI or a court. If a tenant challenges your increase, your documented methodology will be your primary defense.

How to Calculate Your Allowable Rent Increase: Step-by-Step

Step 1: Identify the Relevant 12-Month Period

Oregon rent increases are typically tied to the lease renewal date. The calculation period is the 12 months immediately preceding the rent increase effective date.

Example: If a tenant's lease renews on June 1, 2027, you would calculate the allowable increase using the 12-month average CPI from June 2026 to June 2027 (or, more precisely, the BLS monthly data covering that period).

Important timing note: The BLS publishes CPI data for the prior month on the second week of each month. If you need to issue a 90-day notice on March 1 for a June 1 increase, you may not yet have the complete 12-month average data. Many landlords use the most recent 11 months of published data plus a reasonable estimate for the final month, then recalculate after the final month's data is published. Document this practice—it demonstrates good faith compliance.

Step 2: Retrieve the Correct BLS CPI Data

Go to bls.gov/data and search for "Portland-Salem-Vancouver" or use the series ID APUS49749318. Download the monthly "All items" (not "All items less food and energy" or other subcategories) data for the past 12 months.

The BLS publishes data in this format:

Month	CPI Index Value
June 2026	287.3
July 2026	289.1
August 2026	291.5
...continue for 12 months
May 2027	295.8

Do not confuse the index value with the percentage increase. The index value is the baseline number; you must calculate the year-over-year change.

Step 3: Calculate the 12-Month Average CPI Index Value

Add all 12 monthly CPI index values and divide by 12.

Example calculation:

Month-by-month index values: 287.3 + 289.1 + 291.5 + 290.2 + 292.0 + 293.5 + 294.1 + 296.3 + 295.8 + 297.2 + 298.0 + 299.5 = 3,485.5

Average = 3,485.5 ÷ 12 = 290.46

This is your 12-month average index value. Now compare it to the prior 12 months' average.

Step 4: Calculate the Year-Over-Year Percentage Change

If the prior 12-month average (June 2025 – May 2026) was 284.92, calculate:

(290.46 − 284.92) ÷ 284.92 × 100 = 1.94%

Your allowable rent increase for this lease renewal is 1.94%.

Step 5: Apply the Percentage to Current Rent Only

The increase applies only to rent that has not been increased in the past 12 months. If you increased a tenant's rent 18 months ago, you can increase it again now. If you increased it 6 months ago, you cannot increase it again until 12 months have passed from the most recent increase.

Example application: Current rent is $1,500/month. Allowable increase is 1.94%.

New rent = $1,500 × 1.0194 = $1,529.10

The tenant's new rent is $1,529.10 starting on the lease renewal date, provided you issued 90-day notice.

Notice Requirements: The 90-Day Rule Under ORS 90.322

Calculating the correct percentage is only half the battle. ORS 90.322(1) requires written notice of at least 90 days before any rent increase takes effect. If you fail to provide this notice, the increase is void, and you cannot collect the higher rent.

What Constitutes Proper Written Notice?

Oregon law does not mandate a specific form, but the notice must:

• Be in writing
• Be delivered to the tenant at least 90 days before the effective date
• Specify the new rent amount
• Specify the effective date of the increase
• Identify the current rent (for clarity)

Proper delivery methods: Oregon recognizes personal delivery, mail (with proof of mailing), email (if tenant has agreed to email notices), or posting in a conspicuous location on the premises plus mail.

The 90-day count is strict. Giving notice 89 days before the effective date is insufficient. Courts have interpreted this as a bright-line rule with no equity exception. If the increase is to take effect on June 1, 2027, your notice must be dated and delivered by February 1, 2027, or earlier.

Best practice documentation: Send notice via certified mail with return receipt requested, or use email with read receipts enabled. Retain proof of delivery with your tenant file. If a tenant later disputes the increase, your delivery proof is your strongest evidence that you complied with the 90-day requirement.

No Increases in Year One: ORS 90.322(1)

Even if you have calculated a permissible CPI increase and provided proper notice, you cannot increase rent during the first 12 months of a new tenancy. This applies regardless of whether the tenant moved in mid-lease cycle or at the beginning of the calendar year.

The 12-month clock starts on the date the tenant first takes possession of the unit. If a tenant moves in on March 15, 2026, the earliest you can increase rent is March 15, 2027.

Recent Changes and 2026 Compliance Updates

Oregon's rent control statute has remained largely stable since its enactment in 2016, but enforcement practices and interpretations have evolved:

BOLI Enforcement Activity (2024–2026)

The Oregon Bureau of Labor and Industries (BOLI) has increased audits of landlord compliance with CPI limits. BOLI can investigate complaints filed by tenants and issue cease-and-desist orders requiring immediate rent reduction if violations are found. BOLI has no authority to award damages, but a finding by BOLI often precedes private litigation.

Tenant Litigation Trends

Class action lawsuits against landlords for systematic CPI violations have emerged in the Portland metro area. These cases typically involve landlords who raised rent based on market conditions rather than CPI, or who failed to calculate CPI correctly. Courts have awarded treble damages (three times the overcharged amount) to entire tenant classes, plus attorney fees and costs.

CPI Volatility and Calculation Disputes

In 2021–2023, CPI inflation spiked, and Oregon's allowable increase ceiling reached 9.3% in some years. Some landlords raised rent at this level but incorrectly calculated the percentage or applied increases to rent that had been raised within the prior 12 months. Recent settlements have clarified that the "12 months since last increase" requirement is strictly applied.

Compliance Checklist: Before Issuing a Rent Increase Notice

Use this checklist to ensure your rent increase complies with ORS 90.323(2) and ORS 90.322 before you send the notice to your tenant:

1. Verify the unit location — Confirm the property is within the Portland-Salem-Vancouver MSA (or document your methodology if outside). Excluded properties: owner-occupied with four or fewer units, subsidized housing, certain income-restricted units.
2. Confirm 12 months have passed since the last increase — Review lease history. If rent was increased within the past 12 months, hold the increase.
3. Confirm 12 months have passed since move-in — First-year tenancies cannot receive any rent increase under ORS 90.322(1).
4. Obtain current BLS CPI data — Download the Portland-Salem-Vancouver CPI-U "All items" data for the past 12 months from bls.gov.
5. Calculate the 12-month average index value — Add all 12 months' index values; divide by 12.
6. Calculate the prior 12-month average index value — Repeat for the 12 months prior to the calculation period.
7. Calculate the percentage change — (Current average − Prior average) ÷ Prior average × 100.
8. Document your calculation in writing — Save the spreadsheet or calculation memo with the BLS data source, dates, values, and result. Store this with your lease file.
9. Calculate the new rent amount — Current rent × (1 + percentage increase as decimal).
10. Verify the 90-day notice timeline — If the increase is to take effect on June 1, notice must be dated and delivered by March 3 or earlier (90 days before).
11. Draft the notice — Include current rent, new rent, effective date, and clear language that the increase is limited by Oregon's CPI statute. Do not reference market conditions or property improvements as justification.
12. Deliver the notice via documented method — Use certified mail with return receipt, email with read receipts, or in-person delivery with signed receipt. Retain proof of delivery.
13. Record the notice date and method in your tenant file — Document when notice was delivered, who delivered it, and the method used.

Penalties for Non-Compliance: What Happens If You Violate ORS 90.323(2)

Tenant Litigation Under ORS 90.405

If you increase rent above the CPI cap or fail to provide 90-day notice, the tenant can sue. Oregon's damages statute is severe:

• Actual damages: The difference between what the tenant paid and the lawful rent, for each month the violation occurred. If a tenant overpaid by $100/month for 12 months, actual damages are $1,200.
• Treble damages: Three times the actual damages. In the $100/month example, $3,600.
• Attorney fees and costs: The tenant's attorney fees and court costs, which in contested litigation can exceed $5,000–$15,000.
• Attorney fees for bad faith: If the court finds the violation was willful or in bad faith, damages can be even higher.

BOLI Enforcement

Tenants can also file complaints with BOLI. BOLI can investigate and issue cease-and-desist orders. While BOLI cannot award damages, a cease-and-desist order:

• Requires immediate rent reduction to compliant levels
• Prohibits further violations
• Creates a documented record that can be used against you in private litigation
• Violation of a cease-and-desist can result in civil penalties up to $10,000 per violation

Eviction Defense

If you attempt to evict a tenant for non-payment and the tenant disputes the rent increase as unlawful, the court will not proceed with eviction until the rent dispute is resolved. The tenant can affirmatively sue for the overcharge, and the eviction is stayed.

Common Mistakes Self-Managing Landlords Make

Mistake 1: Using Market Rent Instead of CPI

Violation: Increasing rent by 8% because similar units nearby rent for 8% more. Oregon law prohibits this. The CPI ceiling applies regardless of market demand.

Consequence: Tenant can recover treble damages for the amount over the CPI limit.

Mistake 2: Miscalculating or Misunderstanding the CPI Index

Violation: Using the year-over-year index change (e.g., June 2026 index ÷ June 2025 index) instead of calculating the 12-month average index values. The statute's language is interpreted to require averaging.

Consequence: Increase is likely unlawful, exposing you to liability even if your percentage was close.

Mistake 3: Raising Rent Within 12 Months of a Prior Increase

Violation: Increasing rent to 1.5% on the lease renewal date, then again to 2% nine months later because you "recalculated" the CPI. ORS 90.322 prohibits increases within 12 months of the prior increase.

Consequence: The second increase is void; you must refund the difference.

Mistake 4: Providing Insufficient Notice

Violation: Giving 87 days' notice before an increase takes effect. The statute requires "at least 90 days," and courts read this strictly.

Consequence: The increase cannot take effect on the intended date. You must re-notice with a new effective date at least 90 days after the new notice date.

Mistake 5: Increasing Rent During the First 12 Months of Tenancy

Violation: A tenant moves in on January 15, 2026, and you increase rent on January 15, 2027, coinciding with the lease renewal. Even though 12 months have passed, the increase occurs on the renewal date of the first lease.

Consequence: Many courts hold that the first-year prohibition applies to the entire first lease term, regardless of when renewal occurs. Avoid increasing rent before month 13 from move-in.

Using Compliance Tools to Automate CPI Calculations

Self-managing landlords often juggle multiple lease renewal dates, CPI lookup, and notice timing. Mistakes multiply when managing even 10–15 units with staggered lease cycles.

LeaseBase's compliance engine automatically:

• Retrieves current BLS CPI data for your state and region
• Calculates the allowable rent increase percentage based on the tenant's lease renewal date
• Flags units that are still within the first 12 months of tenancy
• Verifies 12 months have passed since the most recent increase
• Generates pre-populated, compliant rent increase notices
• Tracks 90-day notice delivery dates and compliance status
• Maintains audit trails of all calculations and notices for BOLI or litigation defense

By centralizing CPI calculations and notice generation, you reduce the risk of manual calculation errors, missed deadlines, and notice defects that expose you to liability.

Your lease operations system should also integrate with rent payment processing so that new rent amounts automatically update after the increase is effective, reducing billing disputes.

FAQ: Oregon Rent Increase Calculation and Compliance

Q1: If I raise rent by less than the CPI limit, am I fully compliant?

A: Not automatically. Compliance requires three elements: (1) the increase does not exceed CPI, (2) 90-day notice was provided, and (3) 12 months have passed since the prior increase (or since move-in if this is the first-year prohibition). An increase of 1.5% when CPI allows 3% is still non-compliant if notice was only 60 days or if the tenant is in their first year. The percentage limit is necessary but not sufficient.

Q2: What CPI index do I use if I own units in multiple Oregon counties?

A: If all units are within the Portland-Salem-Vancouver MSA (Clackamas, Columbia, Marion, Multnomah, Polk, Washington, Yamhill in Oregon; Clark, Skamania in Washington), use the Portland-Salem-Vancouver CPI-U. If you own units both inside and outside this MSA, use the Portland-Salem-Vancouver index for units within the MSA and document your methodology for units outside it. Do not mix indices; apply the same index consistently to all units in the same geographic area.

Q3: Can I increase rent by CPI even if the tenant has been there five years and market rent is much higher?

A: Yes, you are permitted to increase rent by CPI annually (or once per 12 months per lease). You are not required to increase rent at the CPI cap; you can increase by less. But you cannot increase by more than CPI, and you cannot increase more than once per 12-month period from the last increase. Market conditions are irrelevant to Oregon's rent control statute.

Q4: If the BLS hasn't published the final month's CPI data yet, can I estimate it?

A: You can, but document your estimate. Use the most recent published data plus a reasonable estimate based on recent trends. Once the final month's data is published, recalculate and issue a corrected notice if your estimate was materially off. Courts will accept estimated calculations if they are reasonable and made in good faith, but you must disclose the estimate to the tenant and correct it when final data arrives. This is a safer approach than waiting for the final data if it means missing your preferred notice deadline.

Q5: What happens if I accidentally calculated CPI wrong and increased rent by 3.5% when the cap was 2.1%?

A: The overcharged portion is an unlawful rent increase. You must refund the difference to the tenant. If you dispute the calculation, the tenant can sue for treble damages on the overcharge. Your best response is to immediately notify the tenant, recalculate correctly, and issue a corrected rent notice for the next lease cycle. Do not wait for litigation; correcting the error voluntarily before a tenant complaints demonstrates good faith and may reduce damages if the tenant does sue.

Compliance Documentation Best Practices

Litigation or BOLI investigation almost always hinges on documentation. Protect yourself by maintaining a permanent file for each tenancy that includes:

Document Type	What to Retain
Lease Agreement	Signed lease with original move-in date, initial rent, and renewal terms
CPI Calculation	Spreadsheet or memo showing BLS data source, all 12 monthly values, average calculation, prior period average, percentage change, and resulting new rent
Rent Increase Notice	Copy of the notice sent to tenant (dated and signed), explicitly stating the increase is limited by ORS 90.323(2)
Proof of Delivery	Certified mail return receipt, email read receipt, or signed personal delivery receipt showing date notice was received
Prior Increase History	Dates and amounts of all prior rent increases during the tenancy
Correspondence	Any emails, letters, or text messages from the tenant regarding the rent increase

Store these documents for at least three years after the tenancy ends. Oregon's statute of limitations for rent increase disputes is generally two years from the date of the violation, but BOLI investigations can be initiated after that period if fraud is alleged.

Next Steps: Building a Sustainable Rent Increase Process

Compliance with ORS 90.323(2) is not a one-time task—it's a recurring process every lease renewal cycle. If you manage multiple units with staggered lease dates, manual tracking becomes error-prone.

LeaseBase's portfolio management dashboard helps you:

• Track lease renewal dates across all units in a single calendar view
• Set reminders for 90-day notice deadlines (typically 93 days before renewal to ensure compliance buffer)
• Store and version control all rent increase calculations and notices
• Generate audit reports showing CPI compliance across your portfolio
• Integrate with rent payment processing so updated rent amounts sync automatically after the notice period expires

Many self-managing landlords find that CPI compliance becomes simpler with centralized documentation and automated alerts. The alternative—managing spreadsheets and paper files across multiple tenancies—is where most errors occur.

Conclusion: CPI Compliance as a Risk Management Priority

Oregon's rent control statute is not optional guidance; it is a hard legal ceiling backed by treble damages liability, attorney fees, and BOLI enforcement. Violating ORS 90.323(2) or ORS 90.322 exposes you to far greater financial risk than the additional rent you might collect from an above-CPI increase.

The calculation itself is straightforward once you understand the steps: retrieve BLS data, compute the 12-month average, calculate the year-over-year percentage change, apply it to rent that hasn't increased in 12 months, and issue 90-day written notice. The operational challenge is doing this consistently, documenting it thoroughly, and avoiding the common mistakes that trigger disputes.

Self-managing landlords who take the time to build a documented, repeatable rent increase process—supported by compliance tools—reduce legal risk and maintain better tenant relationships. Tenants are far less likely to sue when they receive a clearly explained, properly calculated, and timely-noticed rent increase that complies with state law.