Montana Lien Waiver Requirements: What General Contractors Need to Know

Is Montana a Statutory Lien Waiver State?

Yes. Montana is a statutory lien waiver state under Montana Code Section 71-3-531. Montana law provides specific waiver forms that must be used when waiving lien rights on construction projects. Using a non-compliant form in Montana may render your waiver unenforceable even if it is signed by both parties. For context on how Montana compares to other statutory states, see our guides for California, Arizona, and Nevada.

The Montana Statutory Waiver Forms

If you are unfamiliar with the difference between conditional and unconditional waivers, read that first — it is the foundation for understanding which Montana form to use in any given situation.

The Conditional Waiver and Release on Progress Payment covers a partial payment and only becomes effective once the payment described in the document has been received by the signing party. This is the standard form used throughout active Montana projects at each payment milestone.

The Unconditional Waiver and Release on Progress Payment takes effect immediately upon signing regardless of whether payment has been received. This form should only be used after payment has confirmed cleared.

The Conditional Waiver and Release on Final Payment is Montana's conditional final waiver. It releases all remaining lien rights once final payment is received.

The Unconditional Waiver and Release on Final Payment releases all remaining lien rights immediately upon signing and is used at project completion once payment is confirmed.

Montana's Preliminary Notice Requirement

Subcontractors and suppliers who do not have a direct contract with the property owner must serve a preliminary notice to preserve their lien rights. Tracking which parties have served preliminary notices on each project is a critical part of your lien waiver management process in Montana. Parties who have served notice have preserved their lien rights and you need their signed waiver before your project is fully protected.

Montana Lien Filing Deadlines

A subcontractor or supplier must file a lien within 90 days of the completion of their work or the furnishing of materials. Missing this deadline eliminates lien rights permanently. Collecting conditional progress waivers at each payment creates a documented record that directly contradicts any subsequent lien claim for those payment periods.

Common Montana Lien Waiver Mistakes

Failing to track preliminary notice receipts is the most common mistake Montana GCs make. Using non-statutory forms is a serious error. Collecting unconditional waivers before payment clears creates unnecessary risk. Releasing final payment before collecting final waivers eliminates your last point of leverage.

How to Stay Compliant on Montana Projects

Track preliminary notice receipts from day one. Collect a conditional progress waiver from every notice recipient at every payment. Collect conditional final waivers from every subcontractor before releasing final payment and convert to unconditional after confirming payment has cleared. GCs who have a documented waiver process in place are protected. Those managing it manually are one missing notice or unsigned waiver away from a serious problem.