You win a government contract, and the first invoice is 30, 60, sometimes 90 days out. Payroll, materials, and any temporary site setup have to happen now. "Mobilization funding" is the term for the working capital that bridges that gap, and it's worth understanding exactly why the gap exists before you go looking for money to fill it: the federal government's own payment rules are built to reimburse costs you've already spent, not to advance costs you're about to spend. Here's how that mechanic works, and what actually finances the space in front of it, verified at acquisition.gov and sba.gov on August 8, 2026.
Why progress payments don't solve this
Under FAR Subpart 32.5, the customary progress payment rate is 80% of costs for a large business and 85% for a small business, calculated against the total cost of performing the contract, per acquisition.gov. That sounds like an advance. It isn't. The clause requires the contractor to submit a request documenting costs incurred to date; the contracting officer relies on your accounting system and certification to approve it. It's reimbursement for money you already spent, not a float against money you're about to spend.
Construction contracts run under a related but separate clause, FAR 52.232-5. The government makes progress payments monthly as work proceeds, and the contracting officer may retain up to 10% of each payment until satisfactory progress is achieved, releasing it at substantial completion. Material delivered to the site and preparatory work can count toward a payment request, but only if the contracting officer chooses to authorize it; material delivered anywhere else needs the contract to specifically authorize it, plus proof you've acquired title to it. Progress payments on work performed under an undefinitized contract action are capped at 80%, per acquisition.gov. None of this is designed to hand you cash before the work exists.
The Prompt Payment Act, FAR Subpart 32.9, sets the clock once you do submit a proper invoice: 14 days after the designated billing office receives a proper payment request on a construction contract, or the later of 30 days after receipt or 30 days after government acceptance for most other contracts, with an automatic interest penalty if the government misses it, per acquisition.gov. That's a real, enforceable payment floor. It's also still a payment for work already performed, arriving after the mobilization costs are already behind you.
Where the money for mobilization actually comes from
SBA's Contract CAPLine, a variant inside the 7(a) program, finances the direct costs of one or more specific contracts, including overhead and general and administrative expenses allocable to that contract, per sba.gov. It can be structured as revolving or non-revolving, caps at $5 million, and carries a maximum maturity of 10 years. The distinguishing feature: a lender underwrites the line against the contract itself, its payment terms and the paying agency, not just your balance sheet, which is exactly the case a first-time government award needs to make.
If the number is smaller and speed matters more than size, SBA Express caps at $500,000 with a 50% guarantee and a faster approval path than standard 7(a) processing, per sba.gov. It won't cover a large mobilization, but it moves faster than a Contract CAPLine application when the gap is measured in weeks, not months.
Bonding is its own mobilization cost
If the contract requires a performance or payment bond, that's a separate cash outlay before the government pays anything. SBA's Surety Bond Guarantee Program charges a 0.6% guarantee fee on the contract price for performance and payment bonds (no SBA fee applies to bid bonds), and covers contracts up to $9 million on non-federal work and $14 million on federal work, per sba.gov. The fee itself is a mobilization-adjacent cost: it's due at bond issuance, which happens before the contract generates a dollar of billable work.
Where 8(a) certification fits
Nothing above changes based on certification status. What 8(a) status changes is upstream: sole-source awards that create the exact scenario a Contract CAPLine is built to finance, a first-time or larger-than-usual contract with a federal counterparty and no payment history yet on file with that agency's disbursing office. A lender evaluating a Contract CAPLine application against a sole-source 8(a) award is underwriting a federal government payer, which is a materially different credit conversation than a commercial client with an unproven payment record.
Lining up mobilization funding before you need it
Apply for financing while the contract is still in negotiation, not after you've already advanced payroll out of pocket. A Contract CAPLine application moves faster with a signed or imminent contract in hand, since the lender is underwriting the award as much as your business. Have your direct labor, materials, and allocable overhead broken out for the specific contract; that breakdown is what a draw against the line gets measured against as the work proceeds.
Check whether your business is actually positioned to win and perform the award before you go looking for the money to mobilize it. Our government readiness tool checks the pieces that matter beyond financing, and our 8(a) lender directory tracks which lenders underwrite Contract CAPLine and related products against 8(a) sole-source awards specifically.
The FAR's payment mechanics aren't broken. They're doing exactly what they're built to do: paying for work that's already happened. Mobilization funding exists because somebody has to cover the work that hasn't happened yet, and that's a financing decision you make before the contract starts, not a payment term you can negotiate into the government's invoice cycle.
