A general contractor construction invoice needs your business name and license number, the client and project address, a unique sequential invoice number and date, an itemized breakdown of labor, materials, equipment, and subcontractor costs, any retainage withheld, applicable sales tax, payment terms, and a clear total due. Done well, the invoice also carries the supporting documents (change orders, lien waivers, insurance certificate) that the owner needs before releasing funds. Done poorly, it sits in someone’s inbox for weeks or quietly costs you lien rights.
What Belongs at the Top
The header establishes who is billing whom and for which project. Put your registered business name, contractor license number, mailing address, phone, and email at the top. Below that, list the client’s name or company name, their billing address, and any project-specific reference numbers they use internally. Add the physical project address when the client owns multiple properties or when the work site differs from the billing address.
Every invoice needs a unique, sequential invoice number and an issue date. Sequential numbering sounds basic but matters more than most contractors realize. If a payment dispute lands in court or you need to file a lien, a clean numbering system shows you were running a professional operation with traceable records. Include the billing period, a brief project description or contract reference number, and the payment due date. All of this should be readable at a glance before the client reaches the cost breakdown.
Itemizing the Work
The body of the invoice is where you justify the total. Use a table with columns for a description of each work item, the quantity or unit count, the unit price, and the extended total. Each line should be specific enough that the client can connect it to visible progress on the job site. “Framing labor — 120 hours at $45/hr” tells the owner something. “Labor costs” tells them nothing and invites questions that slow down payment.
Break the major cost categories out separately:
- Labor, with hours by trade or task multiplied by the hourly rate.
- Materials, with quantities and per-unit costs. Attach receipts when the contract requires them.
- Equipment rentals (cranes, excavators, scaffolding), listed by day or week.
- Subcontractor costs, ideally referenced by the sub’s own invoice number.
Most general contractors add a markup for overhead and profit on top of direct costs. Markups in the range of 10% to 20% of total project costs are common across the industry, though the exact figure varies by project size, region, and contract type. On a cost-plus contract, the markup is usually stated as a fixed percentage in the agreement and should appear as its own line item so the client can see the math. On a lump-sum contract, the markup is already baked into the bid price and does not need to be broken out.
Below the line items, show a subtotal. If sales tax applies, add it as a separate line. Tax treatment of construction work varies significantly by jurisdiction. In many states, contractors are treated as the end consumer of the materials they install, meaning you pay sales tax when you buy the lumber and concrete rather than collecting it from the client. Other states treat certain contractors as retailers who must charge the client sales tax on the final invoice. The answer depends on your location, the type of contract, and whether the materials become part of the real property. Your accountant or state tax authority can confirm which rules apply. After any applicable taxes, show the grand total in bold or larger type so there is no ambiguity.
AIA G702 and Standardized Pay Applications
Rather than building a commercial invoice from scratch, many contractors use the AIA G702 Application and Certificate for Payment paired with the G703 Continuation Sheet. These forms give you a standardized way to report the original contract sum, approved change orders, work completed to date, materials stored on site, retainage withheld, and the net amount being requested. The G703 breaks the contract sum into individual line items based on your schedule of values, so the architect and owner can track exactly where the project stands financially.1AIA Contracts. AIA Document G702 Application and Certificate for Payment
The G702 is the most widely recognized payment application format in commercial construction, and many owners and lenders require it by name in the contract. If your contract doesn’t specify a form, using the G702 anyway signals professionalism and speeds up review because architects already know where every number lives. Residential contractors and smaller commercial jobs often use simpler templates from accounting software or construction management platforms. Those work fine as long as the invoice includes everything above: sequential invoice number, itemized costs, retainage tracking, and a clear total due. Format matters less than completeness.
Supporting Documents That Travel With the Invoice
A clean invoice by itself is not always enough. Several types of backup can be the difference between getting paid on schedule and watching your application sit for weeks.
Change Orders
Any work outside the original contract scope needs a signed change order before you put it on an invoice. The change order should describe the additional work, state the agreed price, and carry both signatures. Without that paper trail, you are asking the owner to pay for work they may claim they never authorized. This is where most payment disputes start, and it is almost always the contractor who loses when the documentation is missing.
Receipts and Subcontractor Invoices
Cost-plus contracts require you to prove every dollar of direct cost. Attach material receipts, equipment rental agreements, and copies of subcontractor invoices to each pay application. Even on lump-sum contracts, organized receipts protect you if the owner questions a change order price or if you need to substantiate costs during a dispute. The same records make year-end tax reporting far easier.
Lien Waivers
Most owners and construction lenders will not release payment until you submit a lien waiver for the current billing period. A lien waiver is your written agreement to give up the right to file a mechanics lien against the property for the amount you are being paid. They come in four varieties: conditional waiver on progress payment, unconditional waiver on progress payment, conditional waiver on final payment, and unconditional waiver on final payment. The conditional versions only take effect once the check actually clears, which protects you if the payment bounces. Never sign an unconditional waiver until the money is in your account.
If you have subcontractors on the job, the owner will usually want waivers from them too. Collecting those waivers from your subs before submitting your own pay application avoids a common bottleneck. Many states have statutory lien waiver forms that must be used, and a waiver on the wrong form may be unenforceable.
Proof of Insurance
Some contracts require an updated certificate of insurance with each pay application, or at least annually. The standard form is an ACORD 25, which your insurance agent can generate in minutes. If the owner or lender does not see current coverage, your invoice may be held until the certificate arrives. Build this into your billing routine so it never becomes the reason for a delay.
Payment Terms and Retainage
Construction contracts usually specify a payment window using shorthand like “Net 30” (payment due within 30 days of the invoice date) or “Net 15.” Put the terms and the specific calendar due date on every invoice. Spelling out both prevents confusion and gives you a clear trigger if you need to pursue late payment remedies.
Retainage is a portion of each progress payment the owner holds back as security until the project is substantially complete. The typical withholding is 5% to 10% of each approved pay application. Your invoice should show retainage as a deduction from the approved total so the client can see the gross amount earned, the amount withheld, and the net payment due. The AIA G702 has dedicated lines for exactly this purpose.1AIA Contracts. AIA Document G702 Application and Certificate for Payment
Getting retainage released at the end of the project requires its own process. You will usually need a final pay application, a punch list completion certificate, final lien waivers from yourself and all subcontractors, and any close-out documents the contract requires, such as warranties, as-built drawings, and operation manuals. Retainage release is where projects often stall, because one missing document from a sub who has already moved on to another job can hold up tens of thousands of dollars. Stay on top of your subs’ close-out paperwork throughout the project, not just at the end.
How to Submit and What Happens Next
Your contract should specify how and where to deliver pay applications. Commercial projects increasingly use online construction management portals where you upload the invoice, supporting documents, and lien waivers in a single submission. The portal timestamps everything, which eliminates arguments about when the application was received. For projects without a portal, emailing a PDF package is standard. Some contracts still require hard copies by certified mail, which gives you a tracking number and delivery confirmation.
Electronic signatures on pay applications and lien waivers are legally valid under the federal ESIGN Act, which provides that a signature or contract cannot be denied legal effect solely because it is in electronic form.2Office of the Law Revision Counsel. 15 USC 7001 – General Rule of Validity Check your state’s rules on lien waivers specifically, though. Some states mandate a particular form or notarization that a simple electronic click may not satisfy.
After the invoice reaches the client, the project architect or owner’s representative typically reviews it, visits the job site, and compares the percentage of work you claimed against what they observe. They either certify the payment or send back a list of discrepancies. On commercial projects using AIA contracts, the architect has seven days after receiving your application to issue or deny a payment certificate. The full cycle from submission to payment depends on the contract and ranges from a couple of weeks on small residential jobs to 30 days or more on large commercial projects.
When Payment Is Late
Contractors have more legal leverage than they sometimes realize when an owner fails to pay on time. Knowing your options before you need them beats scrambling once the invoice is already 60 days overdue.
Prompt Payment Laws
On federal government projects, the Prompt Payment Act requires agencies to pay interest when construction progress payments are late. Interest starts accruing if payment remains unpaid more than 14 days after the agency receives the pay application. The current interest rate for January through June 2026 is 4.125%.3Bureau of the Fiscal Service. Prompt Payment The rate is tied to Treasury bill auctions and updates every six months. For retainage, the statute requires payment within 30 days of final acceptance if the contract does not specify a date.4Office of the Law Revision Counsel. 31 USC 3903 – Regulations
Most states have their own prompt payment statutes for public and private construction, with interest penalties that typically run 1% to 2% per month on overdue amounts. Check your local statute and reference it in your contract. Citing the applicable prompt payment law reminds the owner that late payment carries a real financial cost.
Mechanics Liens on Private Projects
On private construction projects, your most powerful collection tool is the mechanics lien, a legal claim recorded against the property itself. The lien follows the real estate even if the property is sold, which makes refinancing or resale very difficult until the claim is resolved. Every state has its own mechanics lien statute with specific deadlines and notice requirements. General contractors typically have 60 to 90 days after their last day of work to record the lien, though the window varies. Missing the deadline by even one day can destroy the right entirely.
Some states require a preliminary notice at the start of the project to preserve lien rights. Others only require notice from subcontractors, not the general contractor. The rules are technical, and getting them wrong is easy and permanent. If you are working in a new state, verify the lien requirements before your first invoice goes out.
Payment Bond Claims on Federal Projects
Federal construction projects do not allow mechanics liens against government property. Instead, the Miller Act requires contractors on federal projects over $100,000 to post payment bonds that protect subcontractors and material suppliers. If you furnished labor or materials on a federal project and have not been paid within 90 days after your last day of work, you can bring a civil action against the payment bond. The suit must be filed in U.S. District Court no later than one year after the last day you provided labor or materials.5Office of the Law Revision Counsel. 40 USC 3133 – Rights of Persons Furnishing Labor or Material
Tax Reporting Your Invoices Feed
Invoicing records flow directly into several federal reporting obligations. Getting them wrong can trigger IRS penalties that dwarf the cost of doing it right.
1099-NEC for Subcontractors
If you pay a subcontractor $600 or more during the calendar year, you must file a Form 1099-NEC reporting that payment to the IRS by January 31 of the following year.6Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC To generate accurate 1099s, collect a completed Form W-9 from every subcontractor before the first payment. The W-9 provides the sub’s taxpayer identification number and legal name, and you are required to keep it on file for four years.7Internal Revenue Service. Forms and Associated Taxes for Independent Contractors Making this part of your onboarding for every sub saves a scramble in January.
Form 8300 for Large Cash Payments
Any cash payment you receive over $10,000 in a single transaction, or in related transactions, triggers a Form 8300 filing with the IRS. The form must be filed within 15 days of the transaction, and you must send a written statement to the payer by January 31 of the following year disclosing that you reported the payment.8Internal Revenue Service. Form 8300 and Reporting Cash Payments of Over $10,000 Penalties are steep: $250 per missed return for negligent failures, and up to $100,000 per transaction for intentional disregard. Willful failure to file can result in criminal prosecution with fines up to $25,000 and imprisonment. Large cash payments are uncommon on commercial projects but come up regularly in residential remodeling, so residential contractors should have a system in place.
Recordkeeping
Keep copies of every invoice, pay application, lien waiver, change order, and receipt for at least five years. The IRS can audit up to three years back under normal circumstances, and six years if it suspects a substantial understatement of income. Digital copies are fine as long as they are backed up and retrievable.