Filing your mechanic's lien before the statutory deadline is essential. But in many states, meeting that deadline is not enough to guarantee recovery. Where you file and how much of the contract has already been paid can determine whether your lien holds full value or loses leverage entirely.
That is the distinction between full balance lien states and unpaid balance lien states, and it is one of the most consequential concepts a construction credit professional can understand in mechanic's lien law.
Every state that recognizes mechanic's liens falls into one of two broad categories when it comes to how much a lien claimant can recover.
In full balance lien states (sometimes referred to as full price state), a mechanic's lien is generally enforceable for the full amount owed under the contract, regardless of what the property owner has already paid to the general contractor (GC). If a subcontractor or material supplier hasn't been paid for work or materials furnished to a project, they can file a lien for the total amount due to them, even if the owner has already paid the GC in full.
This can create a situation where a property owner ends up paying twice for the same work: once to the general contractor, and again through enforcement of a mechanic's lien filed by an unpaid subcontractor or supplier.
California is a full balance lien state for most subcontractors and suppliers under California Civil Code § 8430. Here's where it gets consequential for property owners: the lien claimant's recovery isn't capped by what's left on the prime contract.
Say the total contract between an owner and a GC is $200,000. The owner has paid the GC $150,000, leaving $50,000 outstanding. A material supplier who is owed $80,000 files a lien for the full $80,000. In California, the owner is on the hook for that full $80,000, even though it exceeds what remains on the prime contract, and even though the owner has already paid the GC for that portion of the work. The owner's recourse is against the GC for the overpayment, not against the supplier's lien rights. That's the double-payment risk that defines full balance states.
In unpaid balance lien states, a mechanic's lien is generally limited to the amount that remains unpaid on the prime contract between the property owner and the general contractor at the time the lien is filed. If the owner has already paid the GC in full before your lien is recorded, your lien may be unenforceable, even if you filed on time.
Texas is an unpaid balance lien state for most subcontractors and suppliers under Texas Property Code Chapter 53. Using the same numbers: a $200,000 prime contract, with the owner having paid the GC $150,000, leaving $50,000 outstanding. A material supplier owed $80,000 can still file a lien for the full $80,000 they're owed. But in Texas, what they can actually recover through that lien is limited to the $50,000 that remains unpaid on the prime contract at the time of filing. The other $30,000 they're owed has no lien protection, because those funds have already been paid to the GC.
This is why timing is everything in unpaid balance states. If the owner had paid the GC the remaining $50,000 before the lien was filed, the supplier's lien would attach to nothing and their entire $80,000 claim would be unenforceable through the lien. In an unpaid balance state, you are managing two constraints at once: the statutory deadline and the depletion of remaining contract funds. The relevant question becomes not only "Is the lien timely?" but "Are funds still available to recover against?"
Filing early is the most straightforward protection in an unpaid balance state. But preliminary notices add another layer of leverage that credit professionals shouldn't overlook.
Once an owner receives a preliminary notice, they're on notice that an unpaid party exists on the project. If they pay the GC in full after receiving that notice, they may bear greater exposure to the lien claimant's claim. Serving notice early keeps more funds available for recovery and, in some states, can actually determine how much of your claim is enforceable in the first place.
Alabama is generally categorized as an unpaid balance state under Ala. Code § 35-11-210, but it offers full balance lien rights to material suppliers who serve a written notice to the owner before delivering materials to the project. A supplier who skips that step is limited to the unpaid prime contract balance. A supplier who serves it on time can lien for the full amount owed, regardless of what the owner has paid the GC. The notice itself is what changes the recovery outcome.
Not every state works this way, and the rules vary significantly. But the general principle holds: in an unpaid balance state, a timely preliminary notice is one of the most effective tools available to protect your lien rights.
The full vs. unpaid balance framework is a useful starting point, but a few additional distinctions are worth keeping in mind before drawing conclusions about a specific project.
The full vs. unpaid balance distinction primarily applies to subcontractors and material suppliers who lack direct contractual privity with the owner.
General contractors, by contrast, assert lien rights based on amounts owed directly under the prime contract.
As a result, they are effectively full balance claimants by default, regardless of state classification.
On residential projects, lien recovery is typically limited to the unpaid portion of the contract, regardless of whether the state applies a full or unpaid balance framework in commercial contexts.
For credit teams managing mixed portfolios, this creates a materially different risk profile that should not be assumed equivalent to commercial project rules.
The full vs. unpaid balance framework is a useful baseline, but it is not absolute. Variations may depend on claimant tier, notice compliance, project type, and statutory exceptions. As a result, state classification should be treated as a starting risk model, not a final determination of enforceability.
Understanding whether a project is in a full or unpaid balance state should be part of your credit risk assessment from the start, not something you research only after a payment dispute arises.
In either case, the specifics of every project vary, and lien law is technical enough that generalizations only go so far. NCS recommends consulting an attorney for each lien situation, particularly when significant dollars are at stake.
Filing on time is necessary. But in nearly half of U.S. states, it isn't sufficient on its own. Knowing whether your project is in a full balance or unpaid balance state and building that knowledge into your credit process from day one is one of the most practical steps you can take to protect your receivables on construction projects.
Download NCS Credit’s Full vs. Unpaid Balance Lien States infographic for a quick-reference map of commercial lien rules by state.