Idaho Late Fee Laws for Landlords (2026)
What the statute actually says
Idaho Code § 55-305 covers every fee charged to a residential tenant, late fees included, for rental agreements entered or renewed on or after July 1, 2023. It says those fees “shall be reasonable.” It sets no dollar amount and no percentage. It also bars you from charging more than the rental agreement states, or charging a fee the agreement does not include, unless the agreement is oral or you give the tenant 30 days' written notice.
Citation: Idaho Code § 55-305 · read the source
The most you can charge in Idaho
Idaho sets no number, so there is no statutory maximum to work out. At every rent level the test is the same:
| Monthly rent | Statutory cap | What limits the fee |
|---|---|---|
| $900 | None set | must be reasonable and stated in the lease |
| $1,200 | None set | must be reasonable and stated in the lease |
| $1,800 | None set | must be reasonable and stated in the lease |
| $2,500 | None set | must be reasonable and stated in the lease |
Work out your own figure with the late fee calculator →
Is there a grace period in Idaho?
No statutory grace period was found in the chapter cited above. That does not make a fee charged on day one automatically safe - a court still asks whether the fee is reasonable - but Idaho does not set a waiting period by statute. Whatever grace you give should be written into the lease so both sides are working from the same date.
Does the fee have to be in the lease?
Yes, for any rental agreement entered or renewed since July 1, 2023. Idaho Code § 55-305 bars a fee the agreement does not include and bars charging more than the agreement states. The only ways around that are an oral agreement, or 30 days' written notice to the tenant before the fee applies.
Charging it without getting it wrong
Most late-fee disputes are not about the amount. They are about the date the clock started, whether the fee was in the lease, and whether each payment was recorded against the right charge. Those are bookkeeping problems, and they are the ones that lose in court.
LandlordPro applies the grace period you set, charges the fee once, and records each payment against the oldest unpaid month first (that month's late fee when the payment covers it, then its rent), so the ledger shows where every dollar went. The rent roll shows exactly which day a charge landed and why, and the tenant sees the same breakdown in their portal.
Stop working late fees out by hand
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Start freeKey statute for Idaho
Authority: Idaho Code § 55-305
Statute text not quoted here yet — read it at the link above.
What this means: Idaho sets no dollar or percentage cap on rent late fees. The fee must be reasonable and written into the lease, under Idaho Code § 55-305.
Citation from our review of the chapter cited above (see "How we checked"); statute text not quoted here yet.
Frequently asked questions
What is the maximum late fee a landlord can charge in Idaho?
Idaho sets no dollar or percentage cap. Idaho Code § 55-305 says any fee charged to a residential tenant, including a late fee, must be reasonable.
How many days late before a landlord can charge a fee in Idaho?
Idaho sets no statutory grace period, so the lease governs. Put the number of days in writing.
Does an Idaho late fee have to be in the lease?
Generally, yes. Idaho Code § 55-305 bars a fee the rental agreement does not include, unless the agreement is oral or you give the tenant 30 days' written notice first.
Can a landlord charge a late fee every month the rent stays unpaid in Idaho?
Idaho does not address repeat fees by statute. Compounding a fee month after month on the same unpaid rent is the kind of charge courts treat as a penalty, so it is a risk worth avoiding.
Is a late fee the same as interest in Idaho?
No. A late fee is a one-off charge for the administrative cost of a late payment. Interest accrues over time and is regulated separately. Charging both on the same rent invites a challenge.
Related
Questions from Idaho landlords
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