Key Takeaways
- Oregon has a statewide rent increase cap — you must comply with ORS 90.323, which limits annual increases to the greater of 7% or the inflation rate plus 2 percentage points (effective through 2027)
- Penalties for exceeding the cap are severe — tenants can recover three times the overcharge plus attorney fees under ORS 90.323(8), plus the illegal rent must be refunded
- The penalty applies automatically — you don't need a court finding to owe damages; the statute creates a private right of action that tenants can enforce without proving intent or bad faith
- Treble damages stack quickly — on a $200 monthly overcharge, a tenant can recover $600 plus all months of excess rent, reaching $2,400+ on a single unit over one year
- Notice requirements are strict — rent increases must follow ORS 90.322, requiring 90 days' written notice and compliance with form and content rules, or the increase is void
- There is no exemption for good-faith mistakes — miscalculating the cap or failing to track inflation properly does not shield you from treble damages liability
Understanding Oregon's Rent Increase Cap and Your Liability Exposure
In October 2026, you cannot legally raise rent on most Oregon tenants beyond the inflation-based cap set by ORS 90.323. That cap for 2026 is 9.9% (tied to inflation plus 2%), and it's been a fixed rule since 2020 when Oregon passed the nation's first statewide rent control law.
Yet every year, hundreds of Oregon landlords unknowingly exceed this cap. Some miscalculate. Some don't know the rule exists. Others assume an older lease or verbal agreement overrides state law.
All of these lead to the same place: ORS 90.323(8) penalties that can cost you thousands per unit, per year.
This post explains exactly what the law requires, what happens when you breach it, and how to avoid being liable for three times the money you thought you were owed.
What Is Oregon's Rent Increase Cap?
The Core Rule: ORS 90.323(1)
Oregon law prohibits any increase in rent during a tenancy except as allowed by ORS 90.323. This is a hard ceiling, not guidance. The allowed increase is the greater of:
- 7 percent, or
- The percentage change in the Consumer Price Index (CPI) for the Portland–Salem–Corvallis region plus 2 percentage points
For 2026, the CPI component yielded 9.9%, which is higher than 7%, so the cap is 9.9%. For 2027, the Oregon Bureau of Labor and Industries will announce the new rate before January 1, 2027.
The cap applies to all rental units in Oregon except:
- Manufactured dwellings in mobile home parks that are 15+ years old (limited to 10% annually)
- Owner-occupied buildings with no more than two rental units where the owner lives in one of them
- Newly constructed dwelling units for the first three years of occupancy
- Federally subsidized housing where the lease or subsidy agreement allows higher increases
Most self-managing landlords own properties that are covered by this cap, so you need to assume compliance is mandatory.
How the Cap Is Calculated
The increase is calculated on the current rent at the time notice is given, not the original rent. If a tenant's rent is $1,400 in October 2025 and the 2026 cap is 9.9%, the maximum rent for 2026 is $1,538.60. That's the only number you're allowed to charge on or after the effective date of the increase.
Partial-year increases (e.g., mid-lease) are allowed only if the lease itself authorizes them or if the tenant voluntarily agrees. You cannot impose a mid-lease increase to "catch up" to the cap.
What Triggers the Penalty Under ORS 90.323(8)?
The Statutory Language
ORS 90.323(8) states:
"If a landlord increases rent in violation of this section, the tenant may recover three times the difference between the unlawful rent charged and the rent that would have been due under the cap, plus reasonable attorney fees and costs."
Let's break down what this means in practice:
Scenario: How the Penalty Works
Fact pattern: You own a property in Portland with a tenant paying $1,400/month. On January 1, 2026, you raise rent to $1,550 per month, thinking you're within the cap. You weren't. The legal cap for 2026 was $1,538.60, so you overcharged by $11.40 per month.
The tenant's recovery:
- Actual overcharge: $11.40 × 12 months = $136.80
- Treble damages (3×): $136.80 × 3 = $410.40
- The tenant must also be refunded the $136.80 in overcharge
- Plus the tenant can recover attorney fees if they hire a lawyer
- Total out of pocket: $547.20 minimum, plus attorney fees (often $1,500–$5,000)
In a larger case—say you overcharged by $200/month across a 10-unit building for two years—the damages multiply exponentially:
- Actual overcharge: $200 × 24 months × 10 units = $48,000
- Treble damages: $48,000 × 3 = $144,000
- Attorney fees: $5,000–$15,000
- Total exposure: $160,000–$180,000
Critical Point: Bad Faith Doesn't Matter
The statute does not require intent. You can be liable for treble damages even if you:
- Honestly miscalculated the CPI component
- Relied on an accountant or property manager who made an error
- Believed the old rent was grandfathered in under a prior lease
- Made a good-faith mistake about which exemption applied
Negligence, mistake, or reliance on bad advice is not a defense. The law is strict liability for the overcharge amount.
Notice Requirements That Must Be Met to Avoid Voiding the Increase
Even if your increase amount is under the cap, the increase can be invalidated if you don't follow the notice and procedural rules in ORS 90.322. These rules are separate from the cap itself, but they compound your liability if both are violated.
ORS 90.322 Requirements
Timing: You must provide at least 90 days' written notice of any rent increase. The notice must be delivered personally, by mail, or by email if the tenant has agreed to receive notices electronically.
Content: The notice must include:
- The current rent amount
- The new rent amount
- The date the new rent takes effect (at least 90 days after notice is served)
- A statement that the tenant may dispute the increase by contacting the landlord or seeking legal advice
Form: As of 2024, Oregon law requires that rent increase notices follow a model form provided by the Oregon Bureau of Labor and Industries. While minor deviations may not void the notice, using a substantially different format or omitting required language creates legal risk.
Consequence of non-compliance: If notice does not meet these requirements, the increase is void—meaning the rent does not legally increase at all. The tenant can refuse to pay the higher amount. If you attempt to evict for non-payment of the increased (illegal) rent, the eviction fails and you may face counterclaims for statutory damages.
How Tenants Enforce the Penalty
Private Right of Action Under ORS 90.323(8)
Tenants do not need to file a complaint with a government agency. They have a direct legal right to sue you in circuit court or, for smaller amounts, in small claims court (Oregon's limit is $10,000).
A tenant can bring the claim:
- During the tenancy
- After moving out
- As a counterclaim in an eviction (if you sue for non-payment of the illegal increased rent)
- In a separate civil lawsuit years after the overcharge occurred
There is no statute of limitations explicitly stated in ORS 90.323(8), but Oregon's general six-year contract statute of limitations (ORS 12.080) would apply, meaning a tenant could theoretically recover damages for overcharges up to six years in the past.
Attorney Fees as a Multiplier
The "reasonable attorney fees and costs" language is critical. In Oregon rent-overcharge cases, courts routinely award attorney fees of $2,000–$10,000+ because:
- The prevailing tenant's attorney can bill for discovery, motions, and trial preparation
- Courts view rent overcharge violations as serious statutory breaches, justifying full fee awards
- The treble damages themselves often cover the cost of litigation, making it economically viable for legal aid organizations and private attorneys to take these cases
This is why even small overcharges on single units can trigger full litigation costs. A tenant paying $25 too much per month may hire an attorney because the statutory framework guarantees they'll recover attorney fees.
Calculating the 2026 Cap: Step-by-Step
To stay compliant, you must calculate the allowable increase correctly each year. Here's the method:
Step 1: Identify the Current Rent
This is the rent the tenant is paying at the time you serve notice of the increase. Use the most recent lease or rent payment record.
Example: Tenant currently pays $1,400/month.
Step 2: Determine the Applicable Cap
For 2026, the cap is 9.9%. (This changes annually and is announced by the Oregon Bureau of Labor and Industries.)
Step 3: Multiply
Current rent × cap rate = maximum new rent
$1,400 × 1.099 = $1,538.60
The new rent cannot exceed $1,538.60. You can charge less, but not more.
Step 4: Round (if desired)
You can round to the nearest dollar for administrative ease. $1,538.60 could be rounded to $1,539. Many landlords round down to $1,535 to avoid disputes.
Step 5: Document and Serve Notice
Document your calculation (save the math), and serve a compliant 90-day notice using the Oregon model form.
Verification Tool
The Oregon Bureau of Labor and Industries publishes the annual cap on its website. You should verify the current year's rate before serving any notice. As of October 2026, the 2026 cap remains 9.9%, and the 2027 cap will be announced in December 2026.
Common Mistakes That Trigger Penalties
Mistake 1: Assuming the Exemption Applies
Many landlords incorrectly believe they're exempt because they own a small property or recently acquired it. The exemptions are narrow:
- Owner-occupied duplex/triplex exempt: Only if the owner lives in one unit. If you own a duplex but live elsewhere, you're covered by the cap.
- New construction exempt: Only for the first three years after initial occupancy begins. After year three, cap applies.
- Mobile home park owned: Different rules apply; if your park is subject to ORS 90.505 et seq., the 10% cap (not 9.9%) applies instead.
Action: Verify your exemption status explicitly before raising rent above the cap. When in doubt, comply with the 9.9% cap.
Mistake 2: Basing the Increase on the Original Lease Rent
The cap applies to the current rent, not the rent from five years ago when the lease was signed. If rent was $1,200 in 2021 and you've raised it to $1,400 in 2025, the 2026 cap is 9.9% on the $1,400—not on the original $1,200.
Mistake 3: Applying a Mid-Year Increase to "Make Up" Lost Increases
If you failed to raise rent in 2024, you cannot double-increase in 2025. The cap applies per calendar year, and the increase is calculated on the rent in effect at the time notice is given. You cannot compound or carry forward unused cap percentages.
Mistake 4: Not Tracking the CPI Annually
The cap changes every year. Many landlords calculate once and then assume 9.9% applies forever. In 2027, the cap may be 7%, 8%, 10%, or another figure based on inflation. You must check the announced rate each January.
Mistake 5: Failing to Serve the Correct Notice Form
Using a custom-drafted notice or an old template that doesn't match the current Oregon model form can void the entire increase, even if the amount is compliant. The notice must be in writing, delivered properly (personal, mail, or agreed-upon email), and include all required language.
Compliance Checklist for 2026 Rent Increases
| Compliance Step | Requirement | Deadline/Timeline |
|---|---|---|
| 1. Verify exemption status | Confirm unit is not owner-occupied duplex, new construction (<3 yrs), or subsidized housing | Before serving notice |
| 2. Check current 2026 cap | Confirm cap is 9.9% (or verify if law changed); check Oregon Bureau of Labor & Industries website | Before calculating increase |
| 3. Calculate maximum new rent | Current rent × 1.099 = max new rent; do not exceed this amount | Before serving notice |
| 4. Document calculation | Save math worksheet with current rent, cap rate, new rent amount; keep for 3+ years | Same day as calculation |
| 5. Use Oregon model form | Obtain current rent increase notice form from Oregon Bureau of Labor & Industries; do not customize | Before drafting notice |
| 6. Serve 90-day notice | Deliver personally, by certified mail, or by agreed-upon email; keep proof of service | At least 90 days before new rent is due |
| 7. Confirm effective date | New rent effective date must be at least 90 days after notice service; align with lease anniversary or month-to-month date | Before notice is served |
| 8. File/retain proof of service | Keep copy of notice, dated proof of delivery, and tenant signature or mail receipt for 3+ years | After service complete |
| 9. Record new rent in lease/system | Update lease records, rent roll, or accounting software to reflect new rent effective date | Upon effective date |
| 10. Monitor 2027 cap announcement | By December 2026, Oregon will announce 2027 cap; plan 2027 increases accordingly | December 2026 |
Real-World Liability Examples
Example 1: Small Overcharge, Big Cost
Situation: A Portland landlord owns one duplex where she lives. She rents the other unit for $1,400/month. In January 2026, she increases rent to $1,550, intending to charge a 10.7% increase. She did not know about the 9.9% cap (or forgot it applied).
The tenant's recovery:
- Legal rent: $1,400 × 1.099 = $1,538.60, say $1,539
- Illegal rent charged: $1,550
- Monthly overcharge: $11/month
- Annual overcharge: $132
- Treble damages: $132 × 3 = $396
- Refund of overcharge: $132
- Tenant hires attorney; attorney fees awarded: $2,000
- Total landlord pays: $2,528 (plus emotional cost of litigation)
On a single-unit duplex where the landlord expected to profit $200/month from the increase, the legal liability turned a bad decision into a loss.
Example 2: Portfolio-Wide Overcharge
Situation: A Salem landlord owns 15 rental units. In January 2026, she hired a property manager who calculated all increases at 10%, not realizing the cap was 9.9%. The average unit rents for $1,500.
The exposure:
- Legal rent per unit: $1,500 × 1.099 = $1,648.50
- Illegal rent charged: $1,500 × 1.10 = $1,650
- Monthly overcharge per unit: $1.50
- For 15 units over 12 months: $1.50 × 15 × 12 = $270 in overcharges
- Treble damages: $270 × 3 = $810
- If one tenant sues (and others follow): attorney fees $3,000–$5,000 per case
- Total exposure if multiple tenants sue: $15,000–$20,000+
The error was 0.1 percentage points. The cost of the error was substantial.
Example 3: No Exemption Defense Works
Situation: A Eugene landlord owns a two-unit building and rents both units (she lives in a house next door, not in the building). She believed the duplex exemption applied and raised rent to 10.5%. A tenant filed a small claims case.
The outcome:
The court rejected her "I thought I was exempt" defense. The exemption only applies if the owner lives in one of the units. Because she lived elsewhere, both units were subject to the 9.9% cap. She owed treble damages even though she had a reasonable (but incorrect) understanding of the law.
Liability: ~$3,000–$5,000 per unit, depending on rent amount and lease duration.
How to Use LeaseBase to Stay Compliant
Compliance mistakes often stem from disorganization: forgetting which tenants need increases, losing track of current rents, miscalculating percentages, or serving notices without proof of delivery.
LeaseBase's compliance engine and rent payment tracking tools help prevent these errors by:
- Maintaining a current rent roll with each unit's current rent amount
- Calculating maximum allowable increases automatically based on the current year's cap (updated annually)
- Generating compliant rent increase notices in Oregon's required format
- Tracking 90-day notice requirements and flagging deadlines
- Storing proof of notice delivery and tenant acknowledgment
- Maintaining a three-year audit trail for defense purposes
The risk is real. A single calculation error or missed deadline can cost thousands. LeaseBase's platform is built to eliminate these gaps.
FAQ: Rent Increase Penalties and Compliance
Q1: Can I charge the tenant the overcharge amount they already paid if I realize my mistake?
A: No. Once rent is collected illegally, you must refund it. Attempting to recoup the overcharge through a later rent credit or deduction exposes you to additional claims. The correct remedy is to issue a check or credit for the full overcharge, then comply with the cap going forward. Consult an attorney before taking any action, as your state of knowledge and timing matter for defenses.
Q2: Does the "reasonable attorney fees" language mean a tenant can't recover if they don't hire a lawyer?
A: A tenant can sue on their own (pro se) in small claims court and recover treble damages even without an attorney. However, the prevailing tenant can also recover attorney fees if they hire one, which often makes it economically rational for a tenant to get legal representation. This is why even small overcharges lead to full litigation.
Q3: If the tenant agrees to the overcharge verbally, am I off the hook?
A: No. Tenant consent does not override state law. ORS 90.323 is a mandatory rule that cannot be waived by agreement. If you charge more than the cap, you owe treble damages regardless of what the tenant said. Verbal or written waivers are unenforceable.
Q4: What if my accountant told me the cap was 10%? Can I use that as a defense?
A: Reliance on professional advice is not a statutory defense to ORS 90.323(8). The law is strict liability. However, Oregon courts have shown some willingness to consider reliance as a factor in mitigation of attorney fees or in settlement discussions. Your best protection is to verify the cap independently through the Oregon Bureau of Labor and Industries and not rely solely on third-party advice.
Q5: Can a tenant still sue me years after they move out?
A: Yes. There is no contractual statute of limitations explicitly in ORS 90.323(8). Oregon's general six-year statute of limitations for contract claims (ORS 12.080) likely applies, meaning a former tenant could sue you for overcharges dating back six years. This is why maintaining accurate records is critical even after a tenant leaves.
Q6: Do I have to follow the penalty rule if I'm raising rent in the middle of a lease term?
A: Yes, but with a caveat: mid-lease increases are only permitted if the lease itself allows them or if the tenant consents. If you do raise rent mid-lease (with proper authorization), the increase still cannot exceed the annual cap percentage. The cap applies to all increases, regardless of timing.
Staying Audit-Ready: Documentation Tips
If a tenant sues or disputes a rent increase, your documentation will be your defense. Here's what to maintain:
- Cap verification: Screenshot or print the Oregon Bureau of Labor and Industries announcement of the year's cap. Dated and filed.
- Calculation worksheet: Show your math: prior rent, cap percentage, new rent amount. Do not just write "9.9% increase."
- Proof of notice: Deliver the notice by certified mail or personally; keep the signed receipt or certified mail receipt. Email delivery must have read receipts or tenant confirmation.
- Model form compliance: File a copy of the notice you sent; highlight that it uses the Oregon model form (or cite your compliance with content requirements).
- Lease and rent history: Keep copies of all signed leases and rent payment records for at least three years post-tenancy.
These documents are your evidence that you acted diligently and complied with the law. They also demonstrate good faith, which can matter in settlement negotiations even if not in the liability determination itself.
What to Do If You've Already Made a Mistake
If you realize you've overcharged a tenant for rent in prior years, do not ignore it. Proactive steps include:
- Consult an attorney immediately. Do not attempt self-help remedies (e.g., unilateral rent credits) without legal guidance. An attorney can assess your exposure and negotiate with the tenant.
- Calculate the full overcharge amount. Work backward from the tenant's current rent and determine how much you've charged beyond the legal cap.
- Offer a settlement. Paying the overcharge plus a portion of damages (less than treble) is often cheaper than litigation and attorney fees. A negotiated settlement may also include a confidentiality clause.
- Issue a check or credit. Formally notify the tenant that you're refunding the overcharge, effective immediately. Keep a copy of the refund notice.
- Comply going forward. Recalculate the current rent using the cap and serve a compliant notice for any future increases.
Transparency and correction now beat discovery in litigation later.
Key Takeaway: The Cost of Non-Compliance is Too High
Oregon's rent increase cap is real law with real teeth. The treble damages provision was intentionally designed to deter violations. A landlord who overcharges by $100/month faces a potential $400+ annual liability, plus attorney fees, on a single unit.
For self-managing landlords, the compliance burden is yours alone. You do not have a property manager to blame or legal department to shield you. Mistakes in calculating the cap, missing 90-day notice deadlines, or using an incorrect notice form expose you directly to tenant lawsuits.
The solution is systematic: know the cap for the current year, calculate it correctly, document your math, use the Oregon model notice form, serve 90 days in advance, and keep proof of delivery for three years.
Rent increase compliance is not optional. It is the foundation of your relationship with tenants and your defense against liability.