Oregon has no statute requiring landlords to prorate rent for a partial month of occupancy. What Oregon does have is one of the more tenant-protective residential landlord-tenant acts in the country (ORS Chapter 90), with a security deposit statute — ORS 90.300 — that limits what a landlord can deduct in ways many other states don't.

Is Prorated Rent Required in Oregon?

No. Oregon's Residential Landlord and Tenant Act doesn't address prorated rent directly, so what you owe for a partial month depends on your lease. Oregon courts generally hold landlords to the lease as written and expect good-faith dealing, but there's no standalone statute forcing proration if the lease is silent.

In practice, proration is standard in Portland, Eugene, and Salem rental markets — most leases specify it explicitly because move-in dates rarely land on the 1st.

How Prorated Rent Is Typically Calculated in Oregon

Oregon leases commonly use the calendar-days method.

Example: Monthly rent $1,700, move-in date in Portland on the 9th (30-day month).

  • Days occupied: the 9th–30th = 22 days
  • Calendar days: $1,700 ÷ 30 × 22 = $1,246.67
  • 30-day method: same result this month
  • Annual method: ($1,700 × 12 ÷ 365) × 22 = $1,229.59

Check your own math with our free prorated rent calculator.

Oregon Security Deposit Rules

ORS 90.300 is notably specific about what a landlord can and can't deduct:

  • Maximum deposit: No statewide statutory cap (though some cities layer on additional rules)
  • Return deadline: 31 days after the tenancy ends and the tenant delivers possession
  • Written accounting required: The landlord must provide a written accounting specifying the basis for any amount withheld, within that same 31-day window
  • Permitted deductions: Unpaid rent, and cleaning/repair costs only if the unit is left in worse condition than at move-in
  • Normal wear and tear is off-limits: Oregon law explicitly bars deducting for ordinary wear — faded paint, minor carpet wear, worn hinges, and similar aging can't be charged to the tenant
  • Penalty for non-compliance: If the landlord misses the 31-day deadline or fails to provide the accounting, the tenant can sue for twice the amount wrongfully withheld

The normal-wear-and-tear carve-out is one of the more tenant-favorable pieces of Oregon law — it draws a bright line that many landlords across the country ignore in their move-out deductions, but Oregon renters can point to it directly.

Notice Requirements for Month-to-Month Tenancies

  • First year of occupancy: Landlord may end a month-to-month tenancy without cause with at least 30 days' written notice
  • After one year: 60 days' notice is required, and beyond that point a landlord generally needs a qualifying reason — demolition, major renovation, owner or family occupancy, withdrawal from the rental market, or sale to a buyer who intends to occupy
  • Practical effect: Long-term Oregon renters have meaningfully more security against no-cause termination than renters in most other states

Oregon Small Claims Court

  • Claim limit: $10,000 under ORS 46.405
  • Where filed: Small claims department of the Circuit Court in the relevant county
  • Note: A pending bill (SB 484) would raise the cap to $20,000, but it had not been enacted as of mid-2026 — check current status before filing

Oregon Tenant Resources

  • Oregon Law Help: oregonlawhelp.org — plain-language guides on deposits, notices, and evictions
  • Community Alliance of Tenants: Statewide tenant rights hotline and advocacy, based in Portland
  • Oregon Housing and Community Services: State agency resources for renters
  • Statute reference: ORS Chapter 90 (Residential Landlord and Tenant Act); ORS 90.300 (deposits); ORS 46.405 (small claims)

What to Do If You've Been Overcharged in Oregon

  1. Calculate the correct prorated rent using our calculator
  2. Check your move-in inspection report and lease for proration terms
  3. Send your landlord a written breakdown of what you believe is owed
  4. If it's a deposit dispute, check whether any deduction is really just normal wear and tear — that's not a valid deduction under ORS 90.300
  5. Send a formal rent dispute letter if informal contact fails
  6. File in the small claims department of Circuit Court for amounts up to $10,000

The Bottom Line

Oregon doesn't mandate prorated rent, but its security deposit and termination rules are among the more renter-protective in the country. The 31-day accounting deadline, the explicit ban on normal-wear-and-tear deductions, and the shift to cause-based termination after a year of tenancy all give Oregon renters real leverage — know these rules before you accept a landlord's first explanation.