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Montana Tax Lien Sales: How Assignment From the County Works

The Montana format: no auction — an assignment counter

Montana is classified as a lien state, but it does not run the sale most lien investors expect, and this guide will not pretend otherwise. There is generally no conventional auction in most counties: no bidder registration, no deposit, and no rate bidding. Instead, the county attaches the tax lien itself — no later than the first working day in August, with notice by the last Monday in June — and holds it. Investors acquire the lien thereafter by assignment from the county treasurer under MCA 15-17-323.

That changes where the work happens. There is no sale day to win; there is a county counter, a statutory process, and research you do before you ever ask for an assignment. The governing law is Montana Code Annotated Title 15, Chapters 16–18 — principally MCA 15-16-102 (penalty and interest), 15-17-121 et seq. and 15-17-323 (assignment), 15-18-111 (redemption period), and 15-18-211 and 15-18-219 to 15-18-221 (the deed stage).

How an assignment actually happens

The assignee's first step is not payment — it is notice. Under MCA 15-17-323, the would-be assignee must first mail the statutory notice of pending assignment. The assignee then pays the taxes, penalty, interest, and costs, plus the county assignment fee, and takes the assignment of the county's lien position.

Because assignments are handled mostly in person, directly through the county treasurer, and there is no statewide online auction platform for lien assignments, the practical process is: identify delinquent parcels through the county, confirm the lien is available for assignment, complete the notice step exactly as the statute requires, and pay the full assignment amount. Skipping or botching the notice step is the kind of procedural error that can undermine the position you just paid for — treat the treasurer's requirements and the statute, not habit from auction states, as the checklist.

The return math, worked

Montana's stated return has two parts under MCA 15-16-102: interest at 10% per year, expressed as 5/6 of 1% per month, plus a 2% penalty on the delinquent amount. Worked example, using only those figures: the delinquent amount is $5,000. The 2% penalty is $5,000 × 2% = $100. Interest accrues at $5,000 × 5/6% ≈ $41.67 per month, so 12 months of interest is approximately $500. On these figures, the amount built on the original $5,000 after one year is about $5,000 + $100 + $500 = $5,600 — before the costs and the county assignment fee that the assignee also pays under § 15-17-323, which reduce the net economics and must be counted.

Note what is absent: no bidding mechanism changes this rate in either direction. There is no way to bid the return down in a competitive room, and no premium that raises your basis without raising your return — because there is no room. The variables that decide a Montana outcome are which parcels you take assignment of, whether the owner redeems, and whether the deed stage (below) is worth pursuing on that collateral.

Redemption: three years from attachment, ending in August

The redemption period is generally 3 years from attachment of the tax lien, ending the first working day in August (MCA 15-18-111(1)). That August end date gives Montana positions a predictable seasonal deadline: no matter when during the cycle the lien attached, the period runs to that first working day in August three years on.

One shorter period exists, and the dataset corrects a common misstatement of it: the 2-year period in MCA 15-18-111(2) is not a general 'abandoned property' rule. It applies to property subdivided as a residential or commercial lot with delinquent special improvement district / rural SID assessments and no habitable dwelling or commercial structure on it. Apply the 2-year clock only when those specific conditions are present; otherwise the general 3-year period governs. Misclassifying a parcel's clock by a year is an expensive error in either direction.

The deed stage: for residential property, a public auction — with a cancellation risk

Montana's most surprising feature waits at the end. For non-residential property, the assignee follows the direct-deed route of MCA 15-18-211. For residential property, the deed stage is a statutory public auction: after the redemption period expires, the assignee applies for a tax deed under MCA 15-18-219 — paying other liens, delinquent and current taxes, plus a $25 fee, with notice to interested parties — and the county treasurer must hold a public auction in the county within 60 days of the application (MCA 15-18-220, as amended by SB 306, 2025).

The auction's opening bid is a formula: the redemption amount, plus the assignee's § 15-18-219 payments, plus deed and recording fees, plus one-half of the most recent assessed (or appraised) value of the land and dwelling. Payment is due within 24 hours. And the risk is stated plainly in the dataset: if the auction fails, the assignment is cancelled. Proceeds, when the auction succeeds, are distributed under MCA 15-18-221 — the assignee is repaid its amounts, and surplus goes to the legal titleholder of record. An assignee underwriting a residential parcel must therefore model an ending in which they are repaid from an auction they do not control — or, if it fails, an assignment that is cancelled after they have funded the deed application.

What to verify before you take an assignment

Confirm, from the county treasurer and Title 15: that the county's lien on the parcel is available for assignment; the full assignment amount — taxes, penalty, interest, and costs, plus the county assignment fee; the exact notice of pending assignment you must mail under MCA 15-17-323 before paying; the attachment date that starts the redemption clock, and whether the general 3-year period or the specific 2-year subdivided-lot / SID rule in § 15-18-111(2) applies; and whether the property is residential, which routes the deed stage through the § 15-18-219 application and the § 15-18-220 public auction, or non-residential under § 15-18-211.

LienToDeed presents Montana as what it is — an assignment system with an auction only at the residential deed stage — and tracks county assignment availability and the August deadlines, because in Montana the calendar that matters is attachment and redemption expiry, not a sale day.

Questions

Is there a tax lien auction in Montana?
Generally no. Montana is assignment-based, not bid-based: the county attaches the lien (no later than the first working day in August) and holds it, and investors acquire it by assignment from the county treasurer under MCA 15-17-323. There is no statewide online auction platform for lien assignments.

What interest rate do Montana tax liens pay?
10% per year (5/6 of 1% per month) plus a 2% penalty on the delinquent amount (MCA 15-16-102). The rate is fixed — there is no rate bidding.

How long is Montana's redemption period?
Generally 3 years from attachment of the tax lien, ending the first working day in August (MCA 15-18-111(1)). A 2-year period applies only to subdivided residential or commercial lots with delinquent special improvement district / rural SID assessments and no habitable dwelling or commercial structure (MCA 15-18-111(2)).

How does a Montana assignee get the property?
For non-residential property, by the direct-deed route of MCA 15-18-211. For residential property, the assignee applies under MCA 15-18-219 and the county treasurer must hold a public auction within 60 days (MCA 15-18-220); the opening bid is the redemption amount plus the assignee's statutory payments, deed/recording fees, and one-half of the most recent assessed or appraised value of the land and dwelling — and if the auction fails, the assignment is cancelled.