The Lien Clock.
You did the work. You didn't get paid. Missouri gives you a lien on the property itself — but only if you move inside the deadlines. Run the clock on the right, then read how the system actually works below.
By Ty McDuffey, J.D. · Built at Lake of the Ozarks
What a mechanic's lien actually is
A mechanic's lien under Missouri Revised Statutes Chapter 429 is a claim recorded against the real estate you improved. It turns "they owe me" into "the property owes me" — which matters enormously, because owners who ignore invoices tend to stop ignoring anything that clouds their title, blocks a refinance, or complicates a sale. For contractors, subs, suppliers, and equipment lessors, it's the single most powerful collection tool Missouri law provides, and it costs a filing, not a lawsuit, to create.
The clock that matters most
The headline deadline: a lien statement generally must be filed within six months after the indebtedness accrues — for most trades, six months from the last day you furnished labor or materials on the job (RSMo 429.080). That's what the calculator above estimates. Miss it and the lien right is gone; no amount of being right about the money brings it back. Then a second clock starts: once the lien is filed, an enforcement suit generally must be brought within six months of the filing (RSMo 429.170), or the lien lapses.
The traps between you and a valid lien
- Notice requirements. Missouri layers notice duties on top of the deadlines — including a ten-day pre-filing notice to the owner for original contractors, and specific disclosure and notice rules on residential work that can make or break a claim. Which notices apply depends on your role and the property type.
- Punch-list math. Trivial warranty or touch-up work usually does not restart the six months. Counting from the wrong "last day" is the classic way to blow the deadline while believing you're safe.
- The "just and true account." The lien statement must accurately itemize the claim. Sloppy, padded, or vague statements get liens thrown out on paperwork alone.
- Your role changes your rules. Original contractor, subcontractor, and supplier each carry different notice duties. Assume nothing from what the GC did or didn't do.
What smart contractors do before there's a problem
The strongest lien position is built at contract time, not collection time: contracts that pin down scope, draw schedules, and change orders in writing; job files that record first and last days on site; and a habit of calendaring the six-month date the day a job goes sideways, not the month the check is officially late. If a payment fight is already on, the order of operations is simple — confirm your last-furnished date, get the required notices out, and file a clean statement well inside the window. The lien creates the leverage; most matters settle in its shadow without a suit ever being filed.
The calculator estimates the general six-month periods and does not account for role-specific notice rules, disputed accrual dates, or anything else about your job. Educational content only; not legal advice; no attorney-client relationship. The choice of a lawyer is an important decision and should not be based solely upon advertisements.