Why Fast-Growing Businesses Run Out of Cash: A Working Capital Planning Guide

Working Capital For Business Growth in Practice

Profitability appears on the income statement. Liquidity depends on the dates cash moves. The SEC explains that a company can report profit while its cash-flow statement shows whether it generated enough cash to pay expenses and acquire assets. Rising accounts receivable, inventory, and prepaid expenses can consume operating cash, while increased accounts payable can preserve it temporarily. See the SEC’s Beginner’s Guide to Financial Statements and cash-flow statement overview.

During a growth push, the business may need to fund several overlapping sales cycles at once:

• Receivables increase as more customers buy on credit.
• Inventory, materials, and work in process rise to support larger orders.
• Supplier deposits, freight, commissions, and marketing may be due before collection.
• Payroll and payroll taxes continue on fixed dates, including for capacity that is not yet fully productive.
• Returns, tax payments, debt service, owner draws, and required reserves further reduce available cash.

Under accrual accounting, revenue and expenses can be recognized before the related cash is received or paid. That is useful for reporting performance, but it does not answer whether payroll can be met next Friday. The distinction between cash and accrual methods is also discussed in IRS Publication 334.

Second decision: Where does cash leave before the customer pays?

Map the operating sequence before estimating a funding need. For an inventory-heavy wholesaler or light manufacturer, the sequence may look like this:

1. A customer order or forecast prompts a purchase order or supplier deposit.
2. The business pays for materials, inventory, production labor, freight, or fulfillment.
3. Goods are delivered and the customer is invoiced.
4. The customer pays according to agreed terms.
5. The payment settles and becomes available in the bank account.

The cash gap starts at the first committed outflow. It ends only when collected funds are available to use. A signed order, shipment, or invoice can be commercially valuable, but none is the same as cash in the bank.

Illustrative timing example: A business pays a supplier deposit, receives materials, funds production and freight, then invoices when goods ship. If the customer pays several weeks later, the business has funded the whole sequence during that interval. With rising sales, it may be funding multiple sequences at the same time.

Project businesses have a different version of the same issue. Deposits, approvals, milestone billing, unbilled work, retainage, and reimbursable expenses can determine the cash cycle more than conventional inventory. Businesses with project billing can map deposits and milestone payments separately.

Estimate the added trade working capital, then test it

Use the following as a directional estimate, not as an underwriting method or a borrowing formula:

Incremental trade working-capital estimate ≈ added daily sales × net trade-cycle days

This is an in-house planning adaptation of the OCC’s net-days-times-sales-per-day framework. If you do not have a reliable accrual-days measure, do not treat the result as complete; map payroll, taxes, deposits, commissions, and other dated obligations separately in the cash forecast.

This estimate can be misleading when product mix, margins, payment terms, inventory cycles, deposits, or operating costs vary materially. It also excludes or may understate payroll, payroll taxes, supplier deposits, commissions, customer-acquisition costs, equipment, buildout, debt payments, owner draws, refunds, returns, and reserves. Reconcile it to dated cash receipts and outflows before acting on it.

Illustrative growth-rate sensitivity

Assume a wholesale or light-manufacturing business starts at $100,000 in monthly revenue. It has 45 receivables days, 60 inventory days, 30 payables days, and no separately measured accrual days in this simple illustration. That produces 75 net trade-cycle days and a 2.50 multiplier: each added dollar of monthly revenue produces an estimated $2.50 of incremental trade working-capital demand across overlapping sales cycles.

The collection period does not change in this example. The dollar amount tied up still rises because sales rise. The estimate does not include the potentially larger cash requirements of a new shift, hiring, payroll taxes, equipment deposits, or warehouse expansion.

Service and project businesses: payroll can create the gap

Consider a hypothetical agency with no conventional inventory, a 45-day collection period, and a plan to add employees for new client work. It may pay recruiting costs, onboarding, payroll, software subscriptions, and subcontractor advances before it collects an invoice. If work must be performed before it can be billed, unbilled work adds another delay.

For this type of business, review the following dates rather than forcing every cost into an inventory formula:

• Customer deposits and milestone payments due under the contract.
• Invoice issuance, approval, and expected settlement dates.
• Payroll, contractor, commission, and reimbursement dates.
• Retainage, disputed invoices, and customer concentration.

If new hires are the central driver, use a separate plan for the payroll timing gap. Mulah’s guide to financing payroll during growth addresses that issue in more detail.

Fifth decision: Is this a timing gap or a structural cash problem?

A temporary growth gap should have a credible, collection-driven unwind. After collectible invoices settle and growth normalizes, available cash should recover if margins and spending are sound.

A persistent deficit requires a different diagnosis. Review gross margin, pricing, delivery costs, overhead growth, invoice disputes, customer credit quality, inventory aging, owner draws, and debt payments. The expansion plan itself may not be producing sustainable cash.

Ask one direct question: When current receivables are collected, what specifically restores cash, and is that recovery repeatable? If the answer depends on even larger future sales, new borrowing, or continued supplier stretching, the business may have a structural problem rather than a short-lived timing gap.

Consider financing only after the gap is dated and stress-tested

Before evaluating funding, pass four decision gates:

1. Purpose: Identify the specific gap, such as materials paid before a collectible invoice, rather than a general desire for more cash.
2. Peak and duration: Use the 13-week forecast to identify the largest projected deficit, when it occurs, and when collections should reduce it.
3. Repayment fit: Test the obligation under slower collections and lower sales. Expected sales are not guaranteed cash flow.
4. Use match: Separate recurring working-capital needs from long-lived equipment, facility, or buildout costs. Those investments need their own budget and ramp forecast. See how much financing a business expansion needs.

A revolving line may fit recurring and variable timing needs. Receivables-based financing may be relevant when eligible invoices are the central constraint. Supplier terms and customer deposits may reduce the need without creating debt. Term debt may fit a long-lived asset better than a recurring trade-cycle deficit. These are general matching considerations, not product recommendations; the OCC receivables and inventory financing handbook provides regulatory credit context. SBA states that qualifying 7(a) financing can support short- and long-term working capital, but participation, underwriting, terms, and eligibility vary. Review SBA 7(a) information for current program details.

Sales-based financing and merchant cash advances require contract-specific review. The CFPB describes typical merchant cash advances as being repaid with an additional amount, often through a percentage of future receipts or fixed daily withdrawals. As due diligence, review total payback, payment frequency, reconciliation rights where applicable, liens or security interests, personal guarantees, and affordability in a downside case. These terms vary by contract and, in some cases, jurisdiction. The CFPB FAQs and the FTC’s financing perspective provide background.

No product repairs persistent losses, weak unit economics, poor collections, uncontrolled spending, or an expansion plan that cannot support itself. If a specific, time-bound gap remains after operating changes, use the projected peak deficit and downside repayment capacity to size borrowing carefully. For a broader overview, see working-capital financing paths.

Weekly rapid-growth cash review checklist

• Compare actual bank-available cash with the prior week’s forecast.
• Review receivables aging, collection commitments, disputes, and customer concentration.
• Review payables aging, supplier deposits, discount deadlines, and essential purchase orders.
• Check inventory and work-in-process reports for reorders, aging, stockouts, and excess stock.
• Confirm payroll, payroll taxes, debt debits, taxes, rent, owner draws, and other dated obligations.
• Update the 13-week base case and slower-collection case.
• Decide whether to release cash operationally, delay a commitment, revise the growth plan, or evaluate a specifically sized funding need.

Keep recent bank statements, receivables and payables agings, inventory or WIP reports, customer and supplier terms, order and job pipeline reports, profit-and-loss statements, balance sheets, debt schedules, and the 13-week forecast current.

If you have mapped a specific, time-bound cash gap and tested repayment under a downside case, you can explore Mulah’s business funding calculator or start an application. Mulah is not a bank. Mulah’s application disclosure states that, based on advances originated during the six months ended June 30, 2025, average annualized rates were approximately 56.4% for term-based funding and 56.6% for lines of capital. It also states that early payoff may still leave a customer responsible for part of the agreed cost of capital and that some products may require a minimum initial draw. Final pricing, total payback, payment frequency, fees, funding provider, product structure, eligibility, and availability are contract- and applicant-specific; review the current disclosures and final agreement before accepting funding.