The single most important distinction in lien waivers is conditional vs. unconditional — and getting it wrong is how subcontractors accidentally give up rights to money they never received.
Conditional waivers
A conditional waiver takes effect only once the payment actually clears. Until the check is honored (or the ACH settles), the waiver does nothing and the signer keeps full lien rights. That makes it safe to exchange before or alongside a payment.
Unconditional waivers
An unconditional waiver takes effect the moment it’s signed, whether or not payment has cleared. It’s the stronger release — and the riskier one. Sign an unconditional waiver before you’re actually paid, and you’ve released your lien rights with nothing to fall back on if the payment bounces or never comes.
The simple rule
Use a conditional waiver until payment has cleared. Use an unconditional waiver only after you’ve confirmed the money is in the bank.
Several states reinforce this — for example, some void a waiver if the payment check later fails to clear, and others bar waivers given before payment at all. Check the specifics for your state in the lien waivers by state guide.
Progress vs. final
Each type also comes in progress (covers work through a date, with retainage carved out) and final (releases everything). So a typical job uses conditional progress waivers along the way, then an unconditional final waiver once you’re paid in full. (Watch the retainage math — see how retainage affects a progress waiver.)
Automating the hand-off
The conditional-to-unconditional switch is exactly the step that’s easy to fumble by hand. ClearLien tracks the open conditional waiver and auto-drafts the matching unconditional one only once the payment clears in QuickBooks — never before. Or generate either type free.