How to Invoice as a Subcontractor (Pay-When-Paid, Notices & Backcharges, 2026)

Every trade has a hard part about invoicing. For a subcontractor, the hard part is structural: you are not billing the person with the money. You bill the general contractor, your pay application gets folded into their larger application to the owner, and the owner's money has to travel back down that chain before any of it reaches you. You have the least leverage of anyone on the job and the longest wait, and almost every subcontractor payment problem traces back to that one fact. It creates a set of billing realities no other trade deals with: a pay-when-paid clause that makes the GC's payment to you contingent on the owner paying them, a preliminary notice deadline in the opening weeks of a job that silently kills your lien rights if you miss it, a GC billing cutoff that can cost you an entire month if you're a day late, retainage withheld from you the same way the owner withholds it from the GC, backcharges that show up as deductions you never agreed to, and lien waivers you have to both sign upward and collect downward from your own crews and suppliers. None of that is about the quality of your work. All of it decides whether you get paid on time. This guide covers how to invoice as a subcontractor so the paperwork works as hard as the crew does. (If you're on the other side of this — the GC assembling the owner's package — start with our guide to invoicing for construction work.)

Bill the GC on Their Cycle, Not Yours

The first thing that separates subs who get paid on time from subs who don't has nothing to do with the invoice itself: it's hitting the general contractor's billing cutoff. The GC has to assemble every subcontractor's pay application into one package, get it certified by the architect or owner's rep, and submit it by a fixed monthly date. To do that, they set an internal cutoff — often the 20th to the 25th of the month — and a sub who submits on the 26th doesn't get paid late by a few days; they get rolled into the next month's application and paid roughly 30 days later than they should have been. One missed cutoff is the most expensive administrative mistake in subcontracting, and it happens constantly. So find the cutoff date on day one, put it on the calendar as a recurring deadline, and treat it as harder than the work schedule. Bill through the actual cutoff period rather than the calendar month if the two differ, and submit complete — a package missing a lien waiver or an insurance certificate gets set aside, and "set aside" on the 24th means it misses the cutoff just as surely as never sending it. Your application should mirror the GC's format: your schedule of values line items matching the codes they use for your scope, percentage complete per line, amount earned to date, less retainage, net due this period — the same progress-invoicing structure the GC uses one level up, so your numbers drop straight into theirs without anyone re-keying them. Make yourself the easiest sub in the AP stack and you will quietly be the one who gets paid first.

Read the Pay-When-Paid vs Pay-If-Paid Clause Before You Sign

Buried in most subcontracts is a clause that decides how much risk you're carrying, and the two versions of it are not the same thing. A pay-when-paid clause says the GC will pay you after they've been paid by the owner — courts generally read this as a timing provision: it lets the GC delay payment for a reasonable period, but the obligation to pay you eventually stands even if the owner never comes through. A pay-if-paid clause is far more dangerous: it makes the owner's payment a genuine condition precedent to your getting paid at all, which shifts the risk of the owner's nonpayment off the GC and onto you. If the owner goes bankrupt, a true pay-if-paid clause can mean you did the work and are simply never owed the money. Enforceability varies a lot by state and it's worth knowing where you stand: many states void pay-if-paid clauses as against public policy (North Carolina voids both forms outright), while others — Ohio among them — will enforce a pay-if-paid clause only when it clearly and unequivocally states that the sub assumes the risk of nonpayment, so vague drafting usually collapses back into a mere timing clause. Read the clause before you sign, not when the check is late. Push to strike pay-if-paid or convert it to pay-when-paid; if you can't, negotiate an outside date ("in no event later than 60 days after satisfactory completion") so there's a floor. And know that even a valid clause frequently cannot override your state's prompt-payment statute or your lien and bond rights — which is exactly why the notice and waiver discipline in the next two sections matters so much.

Serve the Preliminary Notice — the Deadline That Kills Lien Rights Silently

This is the single most commonly missed protection in subcontracting, and it costs subs more money than any other paperwork failure. Because you have no direct contract with the property owner, most states require you to formally announce yourself early in the job — a preliminary notice (also called a notice to owner, notice of furnishing, or pre-lien notice) telling the owner, the GC, and often the lender that you're supplying labor or materials to their property. Over 30 states require it, and the deadline is short: typically 10 to 90 days after you first furnish labor or materials, with California's well-known rule being 20 days from first furnishing. Here's why it deserves a calendar entry on the day you mobilize: missing the notice deadline permanently bars your mechanics lien, stop notice, and payment bond rights — regardless of how strong your claim is, how good the work was, or how clearly you're owed the money. The strongest invoice in the world is worth very little once your leverage is gone. Treat the notice as step one of billing, not a legal afterthought: serve it at first furnishing on every job (it is not an accusation and not a lien — it's an introduction, and experienced GCs expect it), send it by the method your state requires (certified or registered mail is the common standard), and keep the proof of service in the job file next to the contract. Then know your two downstream deadlines as well: the notice of intent to lien, which some states require before filing and which in practice is the single most effective collection letter in construction, and the lien recording deadline itself, which ranges from about 45 days to 240 days after last furnishing depending on the state, with most falling between 60 and 120. Calendar all three at the start of the job, and the invoice you send in month four still has teeth.

Sign Conditional Waivers Only — and Collect Them From Your Own Subs

Lien waivers move in both directions for a subcontractor, and both directions can hurt you if you're careless. Upward, the GC will require a signed waiver from you before releasing each payment, and the distinction that protects you is conditional vs unconditional: a conditional waiver only takes effect once your payment actually clears, so you can hand it over to get the check without giving up your lien rights until the money is genuinely in the bank; an unconditional waiver surrenders those rights immediately, paid or not. The rule is simple and you should never bend it: submit a conditional progress waiver with each invoice, and sign an unconditional waiver only after that payment has cleared — then a conditional final waiver with your last invoice, and an unconditional final only once you've been paid in full. Always write your retainage, pending change orders, and any disputed amounts into the exceptions section so a routine progress waiver doesn't quietly wipe out claims you haven't been paid for yet. Note also that twelve states — Arizona, California, Florida, Georgia, Massachusetts, Michigan, Mississippi, Missouri, Nevada, Texas, Utah, and Wyoming — mandate statutory waiver forms, so in those states you must use the state's exact language rather than the GC's custom form, and in Wyoming and Mississippi the waiver has to be notarized. Downward, the obligation reverses: if you use lower-tier subs or buy material on account, their lien rights attach to the owner's property too, so the GC will require waivers from them before paying you — meaning your own crew and suppliers become part of your billing package, and an unsigned supplier waiver can stall your check. Collect them on the same cycle you bill on. When a supplier's payment is the sticking point, a joint check agreement — where the GC issues a check payable to you and the supplier together — is the standard fix: it gets the material paid for and the waiver signed without either party carrying the other's risk.

Retainage Flows Down to You — Track It and Invoice Its Release

The owner withholds retainage from the GC — typically 5% to 10% of every progress payment — and the GC almost always withholds the same percentage from you. That means a slice of money you have genuinely earned sits in someone else's account for the length of the project, and on a long job the accumulated total is frequently the entire profit on the work. Show it explicitly on every application — "earned this period $18,400, less 10% retainage ($1,840), net due this draw $16,560" — and keep a running retainage balance so you always know the exact figure being held. Then, when your scope reaches substantial completion and your punch list is signed off, send a dedicated retainage release invoice for the full withheld amount. Two things make this harder for a sub than for the GC, and both are worth planning around. First, your retainage is often not released when your work is done but when the whole project is — so a framer can finish in month three and wait until month fourteen for the release, which is exactly the term to negotiate up front (early release on completion of your scope, or a reduction in the withheld percentage after you've reached 50% completion, both of which are common concessions). Second, retainage is the money most often forgotten: the crew has demobilized, the job feels finished, and nobody chases it. Put the release invoice on the calendar the day you complete your scope, and confirm your state's rules — several now cap retention (California's SB 440 limits it to 5% and adds interest for wrongfully withheld payments) and many prompt-payment statutes set a hard deadline for releasing retainage once the triggering event occurs. It's earned money; it doesn't collect itself.

Dispute Backcharges on the Invoice, Not After the Check Clears

A backcharge is the GC deducting money from your payment for something they say you cost them — site cleanup they had to do, damage to another trade's work, a delay attributed to your crew, materials they supplied, or dumpster and temp-power fees. Some backcharges are legitimate and were agreed to in the subcontract. Many are not: they show up for the first time as a line reducing your check, with no prior notice and no documentation, and the reason they work is that the sub is already behind on cash and doesn't want to fight the GC they hope to work for again. Handle backcharges on the invoice, in writing, while the money is still in motion. Practically: bill your full earned amount on every application rather than pre-deducting a backcharge you don't agree with — if you quietly net it out, you have accepted it. When a deduction appears, respond in writing before the next application, ask for the backup (the contract clause that authorizes it, the dated documentation, the actual cost incurred), and if it's disputed, put it in the exceptions section of your lien waiver so signing the waiver for the paid amount doesn't extinguish your claim to the disputed one. Then carry the disputed amount forward as an open line on your next application — a documented, still-outstanding receivable — rather than letting it disappear from your billing. Protect yourself earlier, too: photograph your work area at the end of each phase, keep the daily reports, and get any GC-directed cleanup or repair of someone else's damage authorized as a change order so the work you did for them shows up as a credit to you rather than a favor. The subs who lose the least to backcharges aren't the most combative; they're the ones whose documentation makes the deduction unarguable in either direction.

Bill Change Orders — and Never Work on a Verbal Field Directive

The change-order rule is the same for you as for the GC — signed before the work happens — but a subcontractor faces a version of it that catches people constantly: the verbal field directive. A superintendent tells your foreman to move the run, add the outlets, or rework what another trade got wrong, the crew does it because the site can't stop, and three weeks later the GC's office has no record that anyone authorized it. That work is legitimately billable and routinely goes unpaid, purely for lack of paper. Fix it with a habit rather than a confrontation: any directive that changes your scope gets confirmed in writing the same day — an email to the super and the PM saying "per your direction this morning we are proceeding with X; estimated cost $Y; treating as a change order pending your written approval" is enough to convert a hallway conversation into a documented claim. Most subcontracts also require written notice of a change within a short window (often 48 hours to 7 days), and blowing that deadline can waive the claim entirely no matter how obviously the work happened. Once approved, the change order goes on your very next pay application as a new schedule-of-values line so it runs through the same percentage-complete and retainage math as your base scope and doesn't sit in limbo until the end of the job. Price changes to include your real cost — overtime, remobilization, restocking, and the schedule impact — not just the raw labor and material, since a change that disrupts your sequence usually costs more than the work itself. And bill approved changes as you earn them; a stack of change orders saved for the final application is the invoice most likely to be argued over when everyone's budget is already spent.

Use Prompt-Payment Acts, Liens, and Bond Claims as the Backstop

An invoice is only as collectible as the leverage behind it, and subcontractors have three real forms of leverage — but only if the earlier steps were done right. First, nearly every state has a prompt-payment act that sets a deadline for how quickly a GC must pay a sub after receiving the owner's funds (commonly 7 to 15 days), and these statutes typically carry interest on late payments and wrongfully withheld retainage, sometimes with attorney's fees for the prevailing party. That's not a courtesy fee you hope holds up — it's statutory, it frequently overrides a pay-when-paid clause's open-ended delay, and simply citing the deadline and the interest rate in a follow-up email moves more checks than any other collection step. Second, on private projects, your mechanics lien is the backstop: it attaches to the owner's property, which is why the owner and their lender care about it far more than the GC does — and it exists only if you served the preliminary notice on time and never signed an unconditional waiver for money you hadn't received. Third, on public projects you generally cannot lien government property, so the substitute is a claim against the payment bond the prime contractor was required to post — federally under the Miller Act, and under each state's "Little Miller Act" for state and municipal work. Bond claims have their own notice deadlines (under the Miller Act, a second-tier sub must give the prime written notice within 90 days of last furnishing, with suit filed within one year), so identify at the start of every public job that a bond exists and get a copy of it. Put all of this on the invoice itself: clear payment terms, the net date, retainage held, and a late-fee or statutory interest line. Then escalate on a schedule rather than by mood — a payment-reminder sequence, then a letter naming the prompt-payment deadline, then a notice of intent to lien or bond claim — the same structured path you'd use with any client who won't pay, except that here every step is backed by a statute.

How InvoiceQuick Helps

Subcontracting rewards exactly what InvoiceQuick is built for: a clean, itemized application that matches the GC's format, shows the retainage math plainly, and lands complete and on time every cutoff. Save your schedule-of-values line items once — your scope broken into the codes the GC bills under, plus your retainage and change-order lines — and each month's application is a few taps: percentage complete per line, amount earned this period, retainage withheld, net due now, with approved change orders added as their own lines and disputed backcharges carried forward as open items instead of quietly vanishing. Subtotals, markup on materials, sales tax where it applies, and totals do their own math; your business details, payment terms, and net date carry over so every application matches the last; and a consistent invoice number sequence ties the whole draw series — mobilization, monthly draws, change orders, and the final retainage release — to one job, one GC, and one contract. That consistency is what makes an AP department certify your package without a second look, and what makes your own records hold up if a backcharge or a retainage release is ever argued. It's free with no sign-up required, so the one-week tear-out and the eighteen-month commercial scope both get invoices that fold cleanly into the GC's application. When you're ready, create your first invoice in about a minute — then reuse it for the next draw and you're done. (Billing a specific trade as a sub? See our guides to invoicing for electrical work, plumbing, HVAC, roofing, and painting.)