A CFO's guide to cash and working capital

Why working capital is where the cash hides

A growing, profitable company can still run out of cash — and most that fail, do. The reason is working capital: the money tied up in receivables and inventory before customers pay you, net of what you owe suppliers. Every dollar locked in that cycle is a dollar you can't use to service debt, fund growth, or weather a slow quarter. For a CFO, freeing it is often the largest source of cash available without raising a dime of new capital.

The discipline starts with measurement. If you can't say what your cash conversion cycle is this month versus last quarter, you can't manage it. Our cash runway calculator turns the balance sheet into weeks of runway — the number every operator should know cold.

The cash conversion cycle: DSO, DIO, DPO

The cash conversion cycle (CCC) measures how many days cash is tied up in operations. It's three components, and the formula is simple: CCC = DSO + DIO − DPO. Lower is better; a negative cycle means suppliers finance your growth.

• DSO — Days Sales Outstanding. How long customers take to pay. (Accounts receivable ÷ revenue) × days in the period. High DSO means you're a bank for your customers.
• DIO — Days Inventory Outstanding. How long goods sit before they sell. (Inventory ÷ cost of goods sold) × days. High DIO ties cash up in the warehouse.
• DPO — Days Payable Outstanding. How long you take to pay suppliers. (Accounts payable ÷ COGS) × days. Higher DPO keeps cash in your account longer — up to the point of straining vendors.

Work each lever with a different playbook: tighten DSO with collections discipline, cut DIO with better demand planning, and extend DPO through negotiated terms rather than simply paying late. For the mechanics and why the metric matters, see why the cash conversion cycle matters.

Freeing trapped working capital

Trapped capital is cash that should be in the bank but is stuck in the operating cycle. Finding it is systematic, not heroic. Go component by component and attack the largest pool first — usually receivables or inventory.

• Receivables: enforce terms, invoice the day work is done, put a real collections cadence in place, and stop shipping to chronically late payers. An AR aging that no one works is money left on the table.
• Inventory: identify slow-moving and obsolete SKUs, right-size safety stock with actual demand data, and stop the reflex to over-order. This is the single biggest trap in manufacturing and distribution — see our note on working capital for manufacturers.
• Payables: negotiate terms deliberately. Ask for net-45 or net-60 at renewal, and take early-payment discounts only when the implied annual return beats your cost of capital.
• Deposits and milestones: for project or custom work, bill progress payments and take deposits so customers fund the work, not you.

Prioritizing vendors in a cash crunch

When cash is tight, you can't pay everyone at once, and a spreadsheet of who's owed what isn't a plan. Prioritization is a risk decision: rank every payable by what breaks if it goes unpaid, not just by invoice age. The goal is to keep the business running while you buy time to fix the underlying cycle.

• Critical/sole-source suppliers first. If losing a vendor stops production or shipment, they're paid before anyone. Continuity beats the aging report.
• Payroll, taxes, and secured obligations. Trust-fund payroll taxes and secured debt carry personal and legal consequences — never the place to stretch.
• Negotiate, don't ghost. A vendor you call proactively with a partial payment and a plan will work with you; one you ignore will put you on credit hold.
• Match payments to the forecast. Every disbursement decision runs through the 13-week cash forecast, so you're prioritizing against real projected balances, not a gut feel.

If the crunch is driven by lender pressure rather than operations, the priorities shift again — distressed and forbearance situations have their own rules, and what your lender wants in forbearance is worth reading before the next covenant call.

How the 13-week cash forecast ties it together

The 13-week cash forecast is the tool that connects all of the above. It's a direct, receipts-and-disbursements model — real dollars in and out by week — not an accrual projection. Thirteen weeks is one quarter: far enough to see problems coming, short enough to forecast with confidence. It's the single most useful instrument a CFO has for managing cash.

• Build it bottoms-up. Start with the bank balance, layer expected receipts by customer, then disbursements by category and vendor.
• Roll it weekly. Update actuals against forecast every Monday. The variance is where you learn — a receipt that slipped is a collections problem to work now.
• Drive decisions from it. Vendor prioritization, draw requests, and hiring pauses all get decided against the projected low point, not today's balance.
• Use it to see the cliff early. The forecast turns 'we might get tight' into 'we're short $340K in week 9' — a problem you can still solve.

For the full build, see our guide to the 13-week cash flow forecast. A well-run forecast is also what turns a nervous lender conversation into a credible one.

Turning it into an operating rhythm

None of this works as a one-time cleanup. Cash discipline is a rhythm: a weekly forecast update, a monthly read on the cash conversion cycle, and quarterly targets for DSO, DIO, and DPO owned by the people who move them — sales owns collections, operations owns inventory, procurement owns terms. When the whole team watches the cycle, the cash follows.

• Weekly: update the 13-week forecast and work the AR aging.
• Monthly: report CCC and its three components against target, alongside the standard close.
• Quarterly: reset working-capital targets and renegotiate vendor terms at renewal.

If you don't have a finance leader driving this rhythm, a fractional CFO can install it in a few weeks — and if you're deciding whether the investment pays off, the fractional CFO cost calculator frames it against the cash you'd free.