Prompt Payment Act: When and How the Government Pays You

Winning a federal contract feels great until you realize the government’s payment terms don’t match your cash flow needs. Traditional wisdom holds that “the government always pays but takes a while” — that’s mostly right, but the specifics matter enormously for small contractors whose payroll runs every two weeks. The Prompt Payment Act is the federal law that governs when and how quickly the government must pay you, what happens if they’re late, and how you’re protected from being strung out on invoices while you’re funding operations from your own capital.

This guide walks through the Prompt Payment Act: standard payment terms, exceptions, interest for late payment, how to get paid faster via WAWF, and the cash-flow realities small contractors need to plan for.

What the Prompt Payment Act does

The Prompt Payment Act (5 CFR Part 1315) requires federal agencies to pay contractors within specific timeframes and pay interest for late payments. The law provides:

• Standard 30-day payment window for most invoices
• Automatic interest for payments beyond that window
• Specific rules for when the clock starts (invoice received AND proper)
• Faster payment terms for certain categories (7 days for meat/dairy, for example)
• Small business acceleration provisions (accelerated payments per federal policy)

The Act applies to all federal executive branch agencies for goods and services procurement. Not applicable: entitlements, grants, contracts with foreign entities, or intra-government transfers.

Standard 30-day payment

Most federal invoices: 30 days from later of:

• Receipt of a proper invoice
• Receipt of goods/completion of services (whichever is later)

“Proper invoice” is precisely defined — invoices missing required elements don’t start the clock. Common required elements:

• Contractor’s name and address
• Contract number and task order number
• Invoice date and invoice number (unique)
• Description of goods/services delivered
• Quantity and unit price
• Total amount due
• Point of contact for questions
• Payment terms and remit-to information (bank routing/account for EFT)
• Discounts offered (for early payment)
• Contractor tax identification number (usually EIN)

Missing any of these = government sends back for correction = clock doesn’t start.

The “constructive receipt” gotcha

The 30-day clock starts when the government RECEIVES the invoice — not when you mailed it. And “receipt” in modern practice means when it lands in the government’s invoice processing system (usually WAWF — Wide Area Workflow, or IPP — Invoice Processing Platform).

If your invoice is mailed and lost, or emailed to the wrong address, or submitted to a system the government doesn’t use, no receipt = no clock start.

Small business best practice: submit invoices through the government’s official system (WAWF or IPP), keep the submission confirmation, and follow up if you don’t see acceptance within 3-5 days.

Interest for late payment

If the government pays more than 30 days late, interest accrues at the Treasury Renegotiation Board Interest Rate (adjusted semi-annually — historically 1-7% depending on the era; check current rates at treasury.gov).

Interest calculation:

• Invoice amount × interest rate ÷ 365 × days late
• Example: $50,000 invoice, 5% rate, 15 days late = $50,000 × 0.05 ÷ 365 × 15 = $103

Interest is automatic — you don’t have to request it. Government will add it to the late payment. If they don’t, contact the contracting officer’s payment representative.

Fast-pay categories

Some invoice types get shorter payment terms:

• Meat, meat food products, fish, seafood: 7 days
• Perishable agricultural products, dairy products, edible fats/oils: 10 days
• Utility invoices under $10K: per specific rate schedules
• Certain construction contracts: 14 days for progress payments

Most small business contracts fall under the 30-day standard.

WAWF — the government’s invoice system

Wide Area Workflow (WAWF, now called iRAPT — Invoicing, Receipt, Acceptance, and Property Transfer) is the DoD’s electronic invoicing system. Most federal contracts require submission through WAWF or a similar platform. See our related guide: how to invoice the government via WAWF.

Benefits of WAWF:

• Automatic acknowledgment when invoice is received (starts the clock reliably).
• Tracking of invoice status through acceptance and payment.
• Reduced errors (system enforces required fields).
• Faster payment turnaround than paper invoices in most cases.

Setup: register at wawf.eb.mil (or the current URL). Requires CAGE code, DoD tokens, and specific contract information. Setup takes 1-2 weeks; do it before your first invoice.

Discounts for early payment

Standard commercial practice: 2/10 net 30 (2% discount if paid within 10 days). Federal government sometimes accepts these terms, sometimes not.

• If you offer 2/10 net 30 on your invoice: the government MAY accept and pay early, taking the 2% discount. Not guaranteed.
• Prompt Payment Discount: some contracts specify discounts. Government usually takes them if offered.
• Math: 2% for 20 days early = ~36% annualized. That’s expensive money if you have any other financing option.

Small business practice: don’t offer aggressive early-payment discounts unless cash flow genuinely requires it. Standard 30-day terms usually work; save the discount for negotiations where it moves a specific decision.

Small business subcontracting payment

If you’re a subcontractor to a large prime, payment terms are governed by the prime contract, not directly by the Prompt Payment Act. Common:

• Pay-when-paid clauses: prime pays you when they get paid.
• Pay-if-paid clauses: prime pays you only if they get paid (riskier).
• Fixed payment terms: net 30 or net 45 regardless of prime’s receipt from government.

Read your subcontract carefully. FAR 52.232-40 requires primes with subcontracts to include prompt payment terms similar to the government’s for their subs. Enforcement varies by prime.

Cash flow reality for small contractors

The Prompt Payment Act gives you 30-day theoretical turnaround. Reality for small contractors:

• Deliver work / complete service
• Prepare invoice (1-3 days internal)
• Submit invoice via WAWF (day 0)
• Government inspection/acceptance (0-14 days for services; longer for goods)
• Payment processing (typically 5-20 days after acceptance)
• ACH transfer to your bank (1-2 days)

Total typical: 15-45 days from work completion to cash in bank. Some contracts pay faster; others (particularly first invoices on new contracts) can take 60-90 days as the government sets you up in their payment system.

What to do when payment is late

If payment is 45+ days after proper invoice submission and hasn’t arrived:

1. Check WAWF status — has invoice been accepted?
2. Contact contracting officer’s representative (COR) via email.
3. If no response in 5 days, contact contracting officer.
4. Escalate to Small Business Liaison Officer (SBLO) if agency has one.
5. File formal request for payment status with the paying office.
6. For extended delays (60+ days), consider filing complaint with the SBA’s Office of the Ombudsman.

Interest accrues automatically after day 30, so you’ll be compensated (modestly) for the delay. But interest doesn’t help with immediate payroll.

Cash flow planning for GovCon

Because government payment can be slow and irregular, plan for it:

Working capital reserves

Rule of thumb: keep 60-90 days of contract expenses in reserve. For a $500K/year contract, that’s $80K-$125K in liquid reserves. Sounds like a lot; it’s what separates surviving contractors from the ones that fold after their first big contract.

Line of credit

Establish a business line of credit BEFORE you need it. Banks are more willing to extend credit to a healthy business than to one that’s suddenly stretched. Available lines don’t cost you anything until drawn.

Government contract financing options

• Progress payments: for fixed-price contracts, request progress payments as work is completed (not just at final delivery). Reduces cash-out-front for you.
• Advance payments: some contracts allow advance payments for startup costs. Rare, but possible.
• Contract finance factoring: commercial lenders (SBA-guaranteed factoring, invoice factoring) will advance you 70-90% of an invoice value immediately, in exchange for 1-3% fee. Expensive but can bridge cash flow gaps.

Invoice frequency

Don’t wait to invoice until end of contract. If contract terms allow monthly or milestone-based invoicing, use it. Faster invoicing = faster payments = better cash flow.

Common Prompt Payment mistakes

• Not registering in WAWF/IPP. Paper invoices take 2-3x longer to process.
• Incomplete invoices. Missing required fields = returned invoice = restart the clock.
• Not tracking invoice submission dates. Without tracking, you don’t know when to follow up or when interest should start accruing.
• Assuming payment is automatic. Government payment systems have glitches. Follow up on 30+ day-old invoices.
• Not requesting progress payments when eligible. Leaves cash on the table until final delivery.
• Cash-flow planning based on best-case scenarios. Plan for 45-60 day payment cycles even when standard is 30 days.

Small business acceleration provisions

Federal policy encourages agencies to pay small businesses faster than the 30-day standard. Some agencies commit to 15-day payment for small business invoices. Ask your contracting officer:

• Does this agency have accelerated payment policy for small businesses?
• Can our invoices be flagged as small business for priority processing?
• What’s the actual average payment cycle for this contract?

Some agencies deliver 15-20 day payment cycles for small businesses; others still average 40-50 days despite policy. Know what to expect.

Setting up your payment infrastructure

Before your first federal contract:

1. Register in SAM.gov with bank information for Electronic Funds Transfer (EFT) — required for federal payment.
2. Set up WAWF/IPP account for invoicing (registration takes 1-2 weeks).
3. Configure your accounting software to segregate government contract revenue and expenses (needed for DCAA compliance if you grow — see our DCAA compliance basics).
4. Establish a business line of credit with your bank.
5. Set up alerts in your accounting system for outstanding invoices past 30 days.

Related GovCon topics

Payment ties into broader contract execution: see our how to invoice the government via WAWF, DCAA compliance basics, and win your first government contract.

Key takeaways

• Prompt Payment Act = 30-day standard payment window from proper invoice receipt.
• Interest accrues automatically for late payments (Treasury rate, ~1-7% historically).
• Use WAWF/IPP for electronic invoicing — faster and more reliable than paper.
• Real payment cycle for small contractors: 15-60 days depending on contract, agency, and invoice quality.
• Plan cash flow for 60-90 day working capital reserves; establish line of credit before you need it.

FAQ

What if the government disputes an invoice? Government may dispute quantity, quality, or pricing. Payment holds while dispute resolves. Communicate directly with the contracting officer; provide additional documentation as needed. If unresolved, formal claim under Contract Disputes Act (rare for invoice disputes; more common for scope disputes).

Can I charge late fees like commercial customers? Not directly. Prompt Payment Act interest is what you get — no additional late fees beyond that. Attempting to add late fees to a federal invoice would be rejected.

Does the Prompt Payment Act apply to state and local governments? No — Prompt Payment Act is federal only. State and local governments have their own prompt payment laws (varies by state). Some state governments pay faster than federal; others pay much slower. Research per jurisdiction.