Billing and Cash Conversion

The most common financial crisis in mid-market government contracting is not a loss. It is a fast-growing, profitable company that cannot make payroll. The mechanism is simple enough to state in one sentence: labor is disbursed every two weeks, and cash arrives on a cycle measured in weeks or months, so every dollar of growth widens the gap. Understanding that gap — and the specific places it can be narrowed — is one of the highest-return uses of a finance function's attention.

The Systems

Invoicing runs through government platforms rather than being sent to a customer's accounts payable. For DoD, that is Wide Area Workflow within the Procurement Integrated Enterprise Environment. For most civilian agencies, it is the Treasury's Invoice Processing Platform. Some agencies operate their own portals.

These systems route submitted invoices through acceptance and approval steps involving multiple parties — a contracting officer's representative, a contracting officer, sometimes a receiving official — before payment is authorized. Each step is a place an invoice can sit.

The Prompt Payment Act establishes payment timelines and interest on late payments, but the clock generally runs from receipt of a proper invoice. That word does the work. An invoice rejected for a formatting error, a wrong CLIN, missing supporting detail, or an expired period of performance is not a late payment — it is a restarted clock, and the contractor bears the delay.

Where the Cycle Actually Stretches

The cash conversion cycle has four segments, and contractors typically focus on the wrong one.

Cost incurred to invoice generated. This is the segment most within the contractor's control and most frequently the largest. A company closing its books on day twenty and billing on day twenty-five has built a month of delay into every dollar before the government has seen anything. Contractors who bill semi-monthly, or who bill labor on a payroll cycle rather than waiting for a full close, take real days out of the cycle.

Invoice submitted to invoice accepted. Governed by invoice quality and by the responsiveness of the approving officials. Quality is controllable. Responsiveness is influenceable — through relationships, through submitting early in the cycle, and through following up rather than waiting.

Acceptance to payment. Largely governed by Prompt Payment timelines and mostly outside the contractor's influence.

Amounts never billed at all. The segment nobody measures. Costs incurred against expired periods of performance, unfunded work performed at risk, aged unbilled that has quietly become unbillable. This is not a timing problem — it is a loss that has not been recognized yet.

Why Growth Consumes Cash

Consider the arithmetic on a T&M program. The contractor hires staff, pays them biweekly from the first day, incurs fringe and overhead against them, and bills monthly in arrears with payment following acceptance. Even with efficient billing, the contractor may be sixty days into funding that labor before the first dollar returns.

Scale that to a program ramping thirty people and the working capital requirement runs into the millions before the program has produced a dollar of collected margin. Win two such programs simultaneously and a profitable company is in genuine distress.

This is why the finance question on a new award is not only whether it is profitable, but whether the company can fund it to steady state. Contractors who model the cash profile of an award before bidding it are rare and are usually the ones who survive rapid growth.

Financing the Gap

Several instruments address this, with different costs and different signals to a future buyer.

• A working capital line. The standard answer. Government receivables are generally strong collateral, and a properly sized line with a borrowing base against billed receivables is the least expensive structure. The recurring failure is a line sized to yesterday's revenue, which is discovered to be too small precisely when it is needed.
• Government contract factoring. Available and expensive. It requires attention to the Assignment of Claims Act mechanics, and heavy reliance on it is read by buyers as evidence that the balance sheet could not support the business.
• Contract financing provisions. Progress payments and performance-based payments on fixed-price work are underused. They are a term to be negotiated, and contractors who never ask never receive them.
• Mobilization and startup terms. On large new programs, front-loaded payment terms are sometimes negotiable and rarely requested.

What Buyers Read Into It

Working capital is not a peripheral diligence topic. It sets the working capital peg in the purchase agreement, which is a direct cash item at closing, and it determines how much capital the buyer must inject to run the business afterward.

Buyers examine days sales outstanding and its trend, unbilled aging by contract, invoice rejection rates where available, revolver utilization across the year rather than at a single point, and whether the company has ever missed or nearly missed payroll.

The interpretation is straightforward. Deteriorating DSO alongside revenue growth suggests billing operations that have not scaled. Aged unbilled with no explanation suggests either revenue quality problems or administrative failure. A revolver drawn to its limit for most of the year rather than fluctuating suggests the line is funding operations rather than timing.

Conversely, a contractor that can present a monthly DSO trend, unbilled aged by contract with reasons, a first-pass acceptance rate, and a thirteen-week cash forecast is demonstrating operational control that materially reduces perceived risk. That is not a compliance artifact. It is the ordinary reporting package of a well-run finance function, and its absence is far more common than its presence.