Idaho Security Deposit Law 2026: Limits, Deadlines & Deductions
- How long does an Idaho landlord have to return a security deposit? 21 days after the end of the lease, unless the lease sets a different period — which can never exceed 30 days (§6-321).
- Is there a limit on security deposits in Idaho? No state limit. §6-321 caps nothing.
- What can be deducted from an Idaho security deposit? Only contingencies specified in the lease, excluding normal wear and tear — typically unpaid rent/utilities, tenant-caused damage, cleaning, and lease-break costs (§6-321).
Idaho is landlord-friendly on the front end — no state cap on the deposit amount and no required separate account — but the back end has teeth: return the deposit within 21 days (or whatever your lease says, never more than 30), and if you stonewall after a demand letter, a judge can award the tenant three times the deposit plus attorney's fees. Every section below is from Idaho Code §§6-320 and 6-321.
The short version: Charge what you want (no cap). Return the deposit — or the balance plus a signed, itemized statement — within 21 days of lease end (your lease can shorten or lengthen it, but never past 30 days). Ignore the tenant's certified demand letter and you're looking at treble damages.
The statute table
| Citation | What it says (one line) |
|---|---|
| Idaho Code §6-320 | Defines "security deposit": any money deposited with the landlord that is not rent is a security deposit. |
| Idaho Code §6-321 | Sets no maximum on the deposit amount — the cap is whatever the market and your lease allow. |
| Idaho Code §6-321 | Return the deposit within 21 days after the tenant surrenders the premises at the end of the lease term; the lease may shorten or extend the period, but never beyond 30 days. |
| Idaho Code §6-321 | Any refund less than the full amount must come with a signed statement itemizing the amount kept, the purpose for keeping it, and a detailed list of expenditures from the deposit. |
| Idaho Code §6-321 | Deductions are limited to contingencies specified in the lease — never normal wear and tear. |
| Idaho Code §6-321(4) | No interest required. An owner holding their own deposit has no separate-account rule, but a third-party manager must keep deposits in a separate account at a federally insured financial institution, apart from its operating account. |
| Idaho Code §6-321 | Four-step enforcement: certified demand letter → 3 business days to return → small-claims suit → judge may award 3x the deposit plus court costs and attorney's fees. |
Limits: how much can you charge?
No state maximum. Idaho Code §6-321 sets no cap — one month, two months, more; it's between you and the lease. Because there's no statutory ceiling, the practical limit is your applicant pool: price your deposit against local norms with the Security Deposit Max Checker.
The 21-day deadline, precisely
The default is 21 days after the tenant gives the premises back at the end of the lease term. Your lease can set a different window — shorter or longer — but never longer than 30 days (§6-321). Whatever the agreed period, the signed itemized statement travels with any partial refund. Get the date right with the Security Deposit Deadline Finder.
When the clock actually starts
Idaho's clock runs from surrender of the premises after the lease or rental agreement terminates — both events, not just one. A tenant who holds over, or who leaves belongings and keeps the keys, has not surrendered; a lease that has not yet terminated has not started the clock either. Once surrender happens, the default deadline is 21 days, and any different period the lease sets still cannot run past 30 days after surrender. The signed itemized statement is not a separate obligation with its own clock — it travels with any partial refund, so it is due on the same day the money is. Log three dates in the deposit file: the termination date, the surrender date, and the refund mailing date, because the 21-vs-30-day question is decided by what the lease says measured from that surrender date.
A worked example
Say a tenancy renting for $1,800 a month terminates and the tenant surrenders the unit on Monday, March 2, 2026, with a $1,800 deposit. With no different period fixed in the lease, your refund deadline is 21 days after surrender: Monday, March 23, 2026. Suppose the lease names the contingencies and the file supports $450 of cleaning and tenant-caused damage beyond normal wear and tear plus $200 of unpaid utilities the tenant owed — $650 in total. You must deliver the $1,150 balance by March 23, accompanied by a signed statement itemizing the $650 kept, the purpose for each amount, and a detailed list of the expenditures made from the deposit. If the lease had instead fixed a 30-day period — the statutory maximum — the same package would be due Wednesday, April 1, 2026, and not a day later. Work backwards from whichever date applies: inspect and photograph in the first days, collect the cleaning invoice and final utility figures while there is still slack, and mail several days early.
Deductions and the itemized list
You may deduct only what the lease names as a contingency — and §6-321 excludes normal wear and tear outright. Typical lease-specified deductions: unpaid rent and utilities, damage beyond ordinary use, cleaning, lease-break and re-letting costs.
If you return less than the full deposit, §6-321 requires a signed statement itemizing three things: the amount kept, the purpose for the amount kept, and a detailed list of expenditures made from the deposit. Build a compliant one with the Security Deposit Deduction Letter Generator.
Move-out compliance checklist
1. Confirm the amount was lawful at move-in. Idaho sets no cap, so the file only needs to show the deposit matches what the lease states — and that nothing collected was disguised rent, since any non-rent money held is a security deposit by definition.
2. Fix both trigger dates on day one. Record the lease termination date and the surrender date separately; the refund clock runs from surrender after termination, not from your walk-through or cleaning date.
3. Check which deadline your lease sets. No period fixed means 21 days; a lease-fixed period is valid only up to 30 days after surrender. Calendar the earlier, correct date.
4. Inspect and document immediately. Walk the unit within the first days, photograph condition, and match every claimed item to a contingency the lease actually names — and screen out normal wear and tear, which can never be charged.
5. Gather the expenditure detail before you write the statement. The signed statement needs the amount kept, the purpose for each amount, and a detailed list of expenditures — invoices, receipts, and final utility figures are what make that list detailed rather than asserted.
6. Sign and deliver the statement with the money. Any refund below the full deposit must be accompanied by the signed itemized statement, delivered inside the same 21-day (or lease-fixed, max 30-day) window.
7. Answer a demand letter inside 3 business days. If a certified demand arrives, treat it as the last exit before small claims — returning the deposit (or the defensible balance with its statement) within 3 business days of receipt is what keeps the treble-damages exposure from ever being tested in court.
Interest and where the money sits
No interest is required under Idaho law. On accounts: an owner holding their own tenant's deposit faces no statutory separate-account rule, but since a 2021 amendment a deposit held by a third-party manager must sit in a separate account at a federally insured financial institution, kept apart from the manager's operating account (§6-321(4); the rule does not apply to the owner, managers sharing members or principals with the owner entity, real estate licensees, or nonprofits). If you hire a manager, confirm in writing where the deposit account sits — the refund liability follows the property to a new owner as well (§6-321(3)).
The penalty, spelled out
Idaho gives tenants a four-step path (§6-321, per the Attorney General's manual):
1. Certified-mail demand letter demanding the deposit back.
2. The landlord gets three business days after receiving it to return the deposit.
3. If that fails, the tenant files in small claims court.
4. If the tenant wins, the judge may award three times the security deposit, plus court costs and attorney's fees.
That 3x multiplier applies after the landlord has already been formally warned and still refused — so the practical lesson is simple: never let a deposit dispute reach the demand-letter stage unanswered.
Run the worked example through that sanction: on a $1,800 deposit, a tenant who follows the demand-letter path and wins can be awarded up to $5,400 — three times the deposit — plus court costs and attorney's fees, even where the underlying dispute was only over the $650 of deductions. The multiplier is measured on the whole deposit, not on the amount wrongfully kept, which is why a small bookkeeping miss carries outsized exposure in Idaho. The flip side is just as stark: the same $650, itemized in a signed statement and delivered with the $1,150 balance by day 21, is fully defensible — and a demand letter answered inside its 3-business-day window never reaches a judge at all.
FAQ
How long does an Idaho landlord have to return a security deposit?
21 days after the end of the lease, unless the lease sets a different period — which can never exceed 30 days (§6-321).
Is there a limit on security deposits in Idaho?
No state limit. §6-321 caps nothing.
What can be deducted from an Idaho security deposit?
Only contingencies specified in the lease, excluding normal wear and tear — typically unpaid rent/utilities, tenant-caused damage, cleaning, and lease-break costs (§6-321).
What is the penalty for not returning a deposit in Idaho?
After a certified demand letter and 3 business days to cure, a judge may award the tenant three times the deposit plus court costs and attorney's fees (§6-321, per the Attorney General's manual).
Does Idaho require a written itemized list?
Yes — any partial refund must be accompanied by a signed statement itemizing the amount kept, the purpose, and a detailed list of expenditures (§6-321).
Does Idaho require interest or a separate account?
No interest. Owners holding their own deposits have no separate-account rule, but a third-party manager must keep deposits in a separate account at a federally insured financial institution, apart from its operating account (§6-321(4)).
When exactly does the 21-day clock start?
On surrender of the premises after the lease or rental agreement terminates. The refund — with the signed itemized statement if it is less than the full deposit — is due within 21 days of surrender, or within the period the lease fixes, which can never exceed 30 days (§6-321).
What should I do if I receive a certified demand letter?
Treat the 3 business days after receipt as a hard deadline: return the deposit, or the defensible balance with its signed itemized statement, before filing can follow. That window is the last point at which the treble-damages exposure can still be avoided.
Miss Idaho's 21-day deadline and you owe triple damages. The Security Deposit Disposition & Deadline Tracker ($14.95) keeps your return deadlines, itemized deductions, and mailing dates in one spreadsheet so the clock never sneaks up on you.
Read the statute yourself
Everything on this page traces back to Idaho Code §6-321 (with the definition in §6-320). If a deadline, deduction, or account question is ever disputed, the primary sources — not a summary — are what control:
- Idaho Code § 6-321 — Security deposits (Idaho State Legislature) — the official full text of the section covering the 21-day refund rule, the 30-day outer limit, the signed itemized statement, and the third-party-manager account rule.
- Idaho Code § 6-321 — Security deposits (Cornell Law Institute) — a readable full-text version of the same section, useful for cross-checking the official text.
More security deposit guides
- Security deposit laws by state
- Hawaii security deposit law
- Illinois security deposit law
- Georgia security deposit law
- Indiana security deposit law
Last verified: October 14, 2026. This is general information, not legal advice. Verify with a licensed Idaho attorney before acting.