Key Takeaways
- Oregon allows one rent increase per 12-month period — governed by ORS 90.323(2), with specific limitations on frequency and timing
- Maximum increase is limited to the annual CPI percentage plus 7% — calculated using the U.S. Bureau of Labor Statistics Consumer Price Index for the Portland-Salem-Eugene region
- Failing to comply costs tenants money — illegal rent increases trigger damages, attorney fees, and potential civil penalties under ORS 90.303
- Notice timing is non-negotiable — you must provide 90 days' written notice before any rent increase takes effect, per ORS 90.323(2)
- CPI data is updated annually — the allowable percentage changes each year on January 1st based on the prior year's BLS index data
- Documentation is your defense — keeping records of the CPI calculation, notice dates, and lease amendments protects you in disputes
Why Rent Increase Compliance Matters in Oregon
Oregon landlords operate under one of the most tenant-protective rent control frameworks in the nation. Unlike California's statewide cap, Oregon's statute is less restrictive but demands precision in execution. A single miscalculation—using the wrong CPI index, failing to provide 90 days' notice, or increasing rent twice in one year—exposes you to damages, attorney fees, and a tenant lawsuit that costs more than years of rent savings.
The risk isn't theoretical. Oregon courts have awarded damages under ORS 90.303 when landlords attempt increases that exceed the statutory cap or violate notice requirements. One misstep triggers the right to sue, and Oregon's fee-shifting rules mean tenants who prevail collect legal costs from you. For self-managing landlords, understanding ORS 90.323(2) isn't optional compliance—it's financial protection.
Understanding ORS 90.323(2): The Statutory Framework
ORS 90.323(2) establishes the rent increase rules for Oregon tenancies. The statute applies to most residential leases in Oregon, with limited exceptions for owner-occupied buildings (duplex or less) and certain subsidized housing. Here's what the law actually says:
Maximum rent increase frequency: You may increase rent only once per 12-month period. This doesn't mean once per calendar year—it means once every 12 months from the date of the last increase or lease signing, whichever is more recent.
Maximum increase amount: The increase is limited to the annual percentage change in the Consumer Price Index (CPI) for the Portland-Salem-Eugene region, plus 7 percentage points. If the CPI is 3%, your maximum legal increase is 10%. If the CPI is 0%, your maximum is still 7%.
Notice requirement: You must provide 90 days' written notice before the increase takes effect. The notice must specify the new rent amount, the effective date, and the calculation method. Providing 89 days is not compliant; 90 days is the legal minimum.
These requirements are mandatory. Violations expose you to actual damages (the difference between what you charged and what you could legally charge), plus attorney fees and costs if the tenant sues. Oregon courts have consistently enforced these provisions in tenant favor.
How to Calculate the Allowable Rent Increase Percentage
The calculation itself is straightforward once you understand the data source. Here's the step-by-step process:
Step 1: Identify the Correct CPI Index
Oregon law requires you to use the Consumer Price Index (CPI) for the Portland-Salem-Eugene, OR-WA region, published monthly by the U.S. Bureau of Labor Statistics (BLS). This is index series CUUR49740SA0, not a national average or other metropolitan area's data. Using the wrong index is a compliance error.
The BLS publishes this data on its website at bls.gov. The index is updated monthly, but for rent increase calculations, you use the annual average for the prior calendar year. As of October 2026, the relevant CPI data for 2025 (used for increases effective in 2026) has been published by the BLS.
Step 2: Calculate the Year-Over-Year Percentage Change
You need two data points: the annual average CPI for the prior calendar year and the annual average CPI for the year before that. The formula is:
Percentage Change = ((Current Year CPI − Prior Year CPI) / Prior Year CPI) × 100
Example: If the 2024 annual average CPI for Portland-Salem-Eugene was 310.5 and the 2025 annual average was 321.8:
((321.8 − 310.5) / 310.5) × 100 = 3.64%
Step 3: Add 7 Percentage Points
The statute allows an additional 7 percentage points above the CPI increase. This is a flat addition, not a multiplier.
Maximum allowable increase = CPI percentage change + 7% = 3.64% + 7% = 10.64%
This is your legal ceiling. You can increase rent by any amount up to 10.64%, but not above it.
Step 4: Apply to Current Rent and Calculate New Rent Amount
Multiply the current monthly rent by the increase percentage (expressed as a decimal).
If current rent is $1,500:
$1,500 × 0.1064 = $159.60 increase
New rent = $1,500 + $159.60 = $1,659.60
You can round to the nearest dollar. The new rent must be clearly stated in your notice.
2026 Rent Increase Cap: Current Year Calculation
For rent increases effective in 2026 (notices issued by October 2025), Oregon landlords use the 2024 vs. 2025 CPI comparison. Based on BLS data published through September 2026, the annual average CPI for the Portland-Salem-Eugene region in 2025 reflects modest inflation recovery post-2024.
| Year | Annual Average CPI (PSE Region) | Year-over-Year Change | Plus 7% | Maximum Increase |
|---|---|---|---|---|
| 2024 | 310.5* | 2.8% | +7.0% | 9.8% |
| 2025 | 321.8* | 3.64% | +7.0% | 10.64% |
| 2026** | TBD (Jan 2027) | TBD | +7.0% | TBD |
*Example data for illustration; verify current BLS figures at bls.gov. **2026 cap will be determined by BLS data released January 2027, used for increases effective in 2027.
Notice Requirements: The 90-Day Rule
ORS 90.323(2) requires 90 days' written notice before a rent increase takes effect. This is not negotiable, and shortcuts create liability.
What Constitutes Valid Notice
Written form: Email, hand delivery, certified mail, or other documented delivery method all satisfy the requirement. Text message alone is insufficient; you need a written record.
Content requirements: The notice must include:
- Current rent amount
- New rent amount
- Effective date of the increase
- Clear statement that this is a rent increase notice under ORS 90.323
- Calculation method (CPI percentage and 7% addition)
Delivery timing: The notice is effective when the tenant receives it. If you mail certified mail on October 1st and the tenant signs for it on October 5th, you have 90 days from October 5th. If using email, send it and keep the confirmation. Document everything.
Effective date calculation: Count 90 days from the date of notice delivery. If notice is delivered on October 1st, the earliest effective date is December 30th (January 1st is more conservative). Mark this on your calendar—off-by-one errors expose you to damages claims.
What Happens If You Don't Provide 90 Days' Notice
If you attempt an increase with insufficient notice (e.g., 60 days, 75 days), the rent increase is void. You cannot legally enforce it. The tenant can refuse to pay the higher amount, and if you attempt collection or eviction, the tenant can countersue for:
- Actual damages (the excess rent you attempted to collect)
- Reasonable attorney fees and court costs (awarded to the tenant)
- Statutory damages under ORS 90.303 in some cases
Oregon courts have consistently voided rent increases lacking proper notice, regardless of the landlord's intent. Compliance is strict.
Rent Increase Frequency: The 12-Month Rule
You can increase rent once per 12-month period. This is measured from lease signing or the last increase date, not from the calendar year.
Calculation Example
Scenario 1: Tenant signs lease on March 1, 2024, with initial rent of $1,500. You increase rent on March 1, 2025 (12 months later). The next permissible increase date is March 1, 2026. You cannot increase again until March 1, 2026, regardless of what month it is.
Scenario 2: Tenant signs lease on March 1, 2024, and you increase rent on January 15, 2025 (within 12 months). This increase is not permissible. The 12-month period is measured from the lease start or last increase, not from when you want to increase. You must wait until March 1, 2025 (12 months after lease signing).
When You Can't Increase Rent
Oregon law prohibits rent increases during certain circumstances:
- Retaliation context: If you have retaliated against a tenant for exercising legal rights (reporting code violations, joining a tenant organization, etc.), any rent increase is presumed retaliatory under ORS 90.385
- Within 12 months of last increase: Frequency limit is absolute
- If increase exceeds statutory cap: The increase is void even if notice is proper
Common Compliance Mistakes (and How to Avoid Them)
Mistake #1: Using the Wrong CPI Index
The problem: Some landlords use the national CPI or another metropolitan region's index. Oregon law is specific: Portland-Salem-Eugene region (BLS index CUUR49740SA0).
How to avoid it: Bookmark bls.gov, navigate to "Portland-Salem-Eugene," and document which index you're using in your notice. Include the index series number in your records.
Mistake #2: Rounding Incorrectly
The problem: Landlords sometimes round up aggressively, exceeding the statutory cap by 0.5% or more.
How to avoid it: Calculate to two decimal places, then round to the nearest dollar when stating the rent amount. Keep the detailed calculation in your records to prove compliance.
Mistake #3: Providing Inadequate Notice
The problem: Landlords count calendar days incorrectly or miscalculate the 90-day window. Email "sent" dates sometimes differ from "received" dates.
How to avoid it: Use certified mail with signature confirmation, or email with read receipts. Count 90 days on a calendar and write down the effective date. Do this twice to verify.
Mistake #4: Increasing Rent Twice in 12 Months
The problem: Landlords forget when they last increased rent, especially with multiple units or high tenant turnover.
How to avoid it: Maintain a rent increase log by unit, including the lease start date, prior increase date (if any), calculation date, and next permissible increase date. Use lease management software to track these dates automatically rather than relying on manual records.
Mistake #5: Failing to Document the Calculation
The problem: If a tenant disputes the increase, you can't prove it was compliant because you didn't save the CPI data, calculation, or notice copies.
How to avoid it: Create a file for each rent increase containing: (1) printout of BLS CPI data used, (2) written calculation showing the percentage change and addition of 7%, (3) copy of notice sent, (4) delivery confirmation, (5) signed lease amendment or notice acknowledgment from tenant. Keep for 7 years minimum.
Lease Amendments and Formal Documentation
While the 90-day written notice satisfies ORS 90.323(2) technically, best practice is to formalize the increase with a lease amendment or rent increase addendum.
What to Include in a Rent Increase Amendment
- Tenant name, address, and lease unit identifier
- Current rent amount and effective date
- New rent amount and effective date
- CPI calculation shown (e.g., "2024 CPI: 310.5, 2025 CPI: 321.8, percentage change: 3.64%, plus 7%: 10.64% maximum increase, applied: 10.64%")
- Tenant acknowledgment or signature line (optional but recommended)
- Date of amendment execution
Signed amendments are stronger evidence of compliance than notices alone. They demonstrate good faith, tenant awareness, and calculation transparency. If a dispute arises, a signed amendment carries weight in arbitration or court.
Tenant Dispute and Retaliation Risks
If a tenant believes your rent increase violates ORS 90.323(2), they can sue under ORS 90.303. Here's what you face:
| Legal Theory | Tenant's Remedy | Your Liability |
|---|---|---|
| Illegal rent increase (exceeds cap or violates frequency) | Actual damages + attorney fees | Difference between charged and legal rent, plus costs |
| Improper notice (fewer than 90 days) | Increase is void; damages if you attempted collection | Return all excess rent collected, plus attorney fees |
| Retaliatory increase (in response to complaint) | Treble damages (3x), plus attorney fees | Up to 3x the illegal rent increase amount |
Retaliation is a particular trap. ORS 90.385 presumes an increase is retaliatory if it occurs within 6 months after a tenant reports a code violation, requests maintenance, or files a complaint. If you increase rent shortly after a tenant reports mold or a plumbing issue, you'll bear the burden of proving the increase was unrelated to the complaint. This burden is difficult to meet.
Using Compliance Tools to Stay Accountable
Self-managing landlords with multiple units can easily lose track of rent increase timelines, CPI data updates, and notice deadlines. Platform tools help:
- Compliance engines that calculate the maximum allowable increase based on current BLS data eliminate manual calculation errors
- Lease management systems that track 12-month intervals from lease signing or last increase prevent frequency violations
- Portfolio dashboards that show which units are eligible for increases and which are not organize your workflow
- Automated notice generation that includes proper legal language and CPI documentation
- Delivery tracking that proves 90-day notice requirements are met
The cost of using these tools is negligible compared to a single tenant lawsuit over an illegal rent increase.
Rent Increase FAQs
Q: Can I increase rent mid-lease if the lease says so?
A: No. ORS 90.323(2) applies to all residential tenancies in Oregon, regardless of lease language. A lease clause permitting mid-year increases is void. You must wait until lease renewal or follow the 12-month rule from the last increase date.
Q: What if my tenant hasn't paid rent—can I increase it anyway?
A: You can legally increase rent even if rent is in arrears, but it's tactically unwise. Serving a rent increase notice while pursuing eviction for non-payment creates retaliation claims and complicates collection. Increase rent, then pursue back rent separately, or wait until the tenancy is settled.
Q: Does the CPI cap apply to month-to-month tenancies?
A: Yes. ORS 90.323(2) applies to all residential tenancies—fixed-term leases, month-to-month, and everything in between. You must still provide 30 days' notice for month-to-month tenancies (per ORS 90.427), which is less than the 90-day rent increase notice. Apply both: give 90 days' notice under ORS 90.323(2), and follow month-to-month termination rules if applicable.
Q: What if BLS data is delayed—do I use estimates?
A: No. Wait for official BLS data. If data hasn't been released, you cannot legally increase rent based on projections or estimates. The law requires the actual annual average CPI. Check bls.gov in December or January to confirm data is published before planning increases.
Q: Can I increase rent by less than the cap?
A: Yes, absolutely. The cap is the maximum, not a requirement. You can increase by 3%, 5%, or any amount below the cap. Some landlords use smaller increases to retain tenants or maintain goodwill, which is legally permissible and often strategically sound.
Compliance Checklist: Preparing a Rent Increase
Use this checklist before sending any rent increase notice:
- ☐ Verify last rent increase date for this unit (or lease start date if no prior increase)
- ☐ Confirm 12 months have passed since last increase
- ☐ Obtain current-year and prior-year annual average CPI for Portland-Salem-Eugene region from bls.gov
- ☐ Calculate year-over-year CPI percentage change
- ☐ Add 7 percentage points
- ☐ Verify final percentage does not exceed calculated cap
- ☐ Apply percentage to current rent; calculate new rent amount
- ☐ Determine effective date (90+ days from notice delivery date)
- ☐ Draft written notice including all required information (current rent, new rent, effective date, calculation method)
- ☐ Send notice via documented delivery method (certified mail, email with read receipt, or hand delivery with signed receipt)
- ☐ Retain copy of notice, delivery confirmation, and CPI calculation in file
- ☐ Consider creating lease amendment for additional documentation
- ☐ Update property management system with new rent amount and next permissible increase date
- ☐ Confirm tenant acknowledges new rent amount before effective date (optional but recommended)
Recent Developments and 2026 Legislation
As of October 2026, Oregon's rent control statute remains ORS 90.323(2), unchanged from prior years. No significant legislative modifications have been enacted in 2024-2026 that alter the CPI cap or notice requirements. However, monitor the Oregon Legislature's website (oregonlegislature.gov) for any proposed bills affecting rent control, as this area is subject to ongoing legislative debate.
The BLS has continued publishing Portland-Salem-Eugene CPI data monthly and annual averages each January. This index remains the legal benchmark for Oregon rent increases.
Avoiding Retaliation Claims When Increasing Rent
ORS 90.385 creates a rebuttable presumption of retaliation if a rent increase occurs within 6 months of protected tenant activity, including:
- Reporting code violations to the local housing authority
- Requesting repairs or maintenance in writing
- Filing a complaint about uninhabitable conditions
- Organizing with other tenants or joining a tenant association
- Asserting rights under the landlord-tenant law
If you increase rent within 6 months of any such activity, the burden shifts to you to prove the increase was unrelated and was planned independently of the tenant's action. This is difficult. Best practice: Document that the increase was planned before any complaint (by maintaining a written rent increase schedule), and maintain at least 6-month distance between complaints and increases whenever possible.
Final Compliance Reminders
Oregon's rent control statute is designed to allow landlords reasonable returns while limiting sudden, large increases. Compliance is achievable with accurate CPI calculations, proper notice delivery, and careful tracking of the 12-month interval. The risk of non-compliance—damages, attorney fees, and litigation costs—far exceeds any benefit of cutting corners.
For landlords with 5+ units, the administrative burden of tracking individual unit timelines, calculating CPI each year, and managing notices manually grows quickly. Compliance platforms can reduce this burden by automating CPI tracking, calculation, and notice generation, ensuring you never miss a deadline and never exceed the legal cap.
Stay compliant. Document everything. Wait the full 90 days. Verify your CPI source. Keep your records. Your tenants will thank you—and your business will be protected.
Disclaimer: This article is for informational purposes only and does not constitute legal advice. Consult a qualified attorney licensed in Oregon for guidance specific to your situation or property. Rent increase laws are complex and subject to ongoing interpretation by Oregon courts. This article reflects the law as of October 2026 and does not account for future legislative changes.