Missouri lien waiver requirements

Missouri prescribes a statutory unconditional lien waiver form, and a waiver must follow it to be valid. Missouri also bars “advance” waivers signed in exchange for being awarded the contract.

This guide covers Missouri’s waiver rules, the advance-waiver bar, and conditional vs. unconditional use. It is general information, not legal advice — confirm specifics with a Missouri construction attorney.

Missouri at a glance

Mandatory statutory form

Yes — a statutory unconditional waiver form is prescribed

Governing lien law

Missouri Revised Statutes ch. 429 (mechanic’s liens)

Waiver types

Conditional and unconditional both used

Advance waivers

Void — cannot waive in exchange for being awarded the contract

Notarization

Not required

How ClearLien handles Missouri waivers

ClearLien automates the waiver loop for general contractors on QuickBooks Online: pay a subcontractor’s bill and the waiver is drafted from the payment, sent for no-account signing on any phone, and stored with a full audit trail — with retainage carved out. Minnesota’s form is live today and Missouri’s statutory forms are on the roadmap — start free and you’ll be ready the moment Missouri support goes live.

Missouri lien waiver FAQs

Does Missouri require a specific lien waiver form?

Missouri prescribes a statutory unconditional waiver form that must be followed. Conditional and other waiver types are also used; advance waivers signed in exchange for the award of a contract are void.

Do Missouri lien waivers need to be notarized?

No. Notarization is not required for a Missouri lien waiver to be effective.

What is the difference between conditional and unconditional in Missouri?

A conditional waiver takes effect only once payment actually clears; an unconditional waiver takes effect on signing regardless of payment, so sign it only after you have been paid.

Are electronic signatures valid in Missouri?

Generally yes, under Missouri’s adoption of UETA and the federal ESIGN Act. ClearLien records a full audit trail and stores the signed PDF tamper-evident with a content hash.

Does ClearLien support Missouri?

ClearLien automates the lien-waiver loop for general contractors on QuickBooks Online — pay a bill and the waiver is drafted, sent for no-account signing, and stored with an audit trail. Minnesota’s form is live today and Missouri is on the roadmap; start free and you’ll be ready the moment Missouri support goes live.