There is a version of a cash flow problem that doesn't come from being unprofitable or undercapitalised. It comes from having cash tied up in your own business — sitting in unpaid invoices, in inventory that hasn't moved, in supplier payments you've made before you've collected from customers. This is a working capital problem, and it is one of the most common and most fixable financial challenges for growing SMBs.
Working capital management is the discipline of actively managing the timing and efficiency of cash movements through your operating cycle. Done well, it can free up significant amounts of capital that are already inside your business — reducing your dependence on external financing and giving you better control over your cash position. It matters more when money costs more; see interest rates and working capital planning.
What working capital is and why it matters
Working capital is defined as:
Working Capital = Current Assets − Current Liabilities
In practice, for most SMBs, the key components are:
- Accounts Receivable (AR): Money customers owe you for goods or services already delivered
- Inventory: Stock purchased but not yet sold
- Accounts Payable (AP): Money you owe suppliers for goods or services already received
- Deferred Revenue: Cash received from customers for services not yet delivered
Positive working capital (current assets > current liabilities) means the business has more short-term assets than short-term obligations — generally a sign of financial health.
Negative working capital isn't necessarily bad. Some business models are structurally negative on working capital — subscription businesses that collect cash upfront, or large retailers with significant supplier financing. In these cases, negative working capital is actually a feature: the business is funded by its customers and suppliers rather than by equity.
The problem arises when working capital is unexpectedly positive and growing — meaning the business is deploying more cash into its operating cycle as it grows than it's collecting. This is the "profitable but cash-poor" dynamic that catches many SMBs off guard.
The three working capital metrics that matter most
Days Sales Outstanding (DSO)
DSO measures how long it takes, on average, to collect payment after invoicing.
DSO = (Accounts Receivable ÷ Revenue) × Number of Days in Period
A DSO of 45 means your customers take 45 days on average to pay from invoice date. If your payment terms are net-30, a DSO of 45 means you're collecting 15 days late on average — which has a quantifiable cash impact.
Cash impact of DSO reduction: For a business with €2M annual revenue, every 10-day reduction in DSO frees up approximately €55,000 in working capital. At €5M revenue, the same improvement frees up €137,000. This is real cash, available now, without any new financing.
Days Payable Outstanding (DPO)
DPO measures how long you take on average to pay suppliers after receiving their invoice.
DPO = (Accounts Payable ÷ COGS) × Number of Days in Period
Higher DPO means you're holding cash longer before paying it out — which is favourable for your working capital position, up to the point where you're damaging supplier relationships or missing early payment discounts.
Cash Conversion Cycle (CCC)
The Cash Conversion Cycle combines DSO, inventory days, and DPO into a single metric that captures the total time between cash going out to fund operations and cash coming back in from customers.
CCC = DSO + Inventory Days − DPO
A shorter CCC means the business converts its operating activities to cash more quickly — which reduces the working capital requirement and increases cash generation. A CCC of 30 is meaningfully better than a CCC of 60 for a business generating the same revenue and profit.
Seven levers to improve working capital efficiency
1. Accelerate invoicing. The clock on payment terms starts from invoice date. If you deliver a project on November 25th but don't invoice until December 5th, you've given your customer 10 extra days of free financing. Invoice immediately on delivery — or better, invoice upfront for a deposit before work begins.
2. Shorten payment terms on new contracts. Net-60 terms are a negotiated outcome, not a fixed law. For new customers, start with net-30 as your standard. For existing customers on net-60, consider renegotiating at contract renewal. Enterprise customers will often push back, but mid-market and SMB customers typically accept market-standard terms.
3. Offer early payment discounts selectively. A 1–2% discount for payment within 10 days (often written as "2/10, net-30") is a highly cost-effective way to accelerate cash collection from customers who have the cash to pay early. At 2% for 20 days early payment, the annualised cost of the discount is approximately 36% — which sounds expensive, but compare it to the cost of an overdraft facility or the opportunity cost of cash tied up in receivables.
4. Implement a structured collections process. Most late payments are not deliberate — they're just not being chased. A systematic collections process: automatic reminder at 7 days before due date, personal follow-up at due date if not paid, escalation at 10 days overdue, and formal notice at 30 days overdue. Companies that implement this consistently reduce their average DSO by 10–20 days within a quarter.
5. Extend supplier payment terms. Contact your key suppliers and ask about extended payment terms. Many will agree — particularly for reliable customers with clean payment histories. Moving from net-30 to net-45 with your largest supplier improves your DPO and the corresponding cash position. Even a few large suppliers can have a material impact.
6. Manage inventory more actively. For product businesses, slow-moving inventory is cash sitting on a shelf. Implement a minimum order quantity policy that balances the cash cost of holding inventory against the cost of reordering more frequently. Flag items that haven't moved in 90+ days and take action — discounting to clear slow-moving stock is almost always better than the carrying cost of holding it.
7. Restructure billing cycles. For service businesses, weekly billing cycles are significantly better for working capital than monthly billing. If you're a consulting firm billing monthly in arrears, the average outstanding amount at any point in time is approximately half a month's revenue. Moving to weekly billing in arrears cuts that outstanding balance by 75%.
Working capital and growth: the trap to avoid
One of the most dangerous dynamics for a fast-growing SMB is working capital that scales with revenue but doesn't improve as a percentage. If your revenue grows 50% and your working capital requirement grows 50% simultaneously, you've created a cash requirement that may outpace your ability to fund it.
The classic example: a B2B services business wins a major new contract. Revenue jumps. Staff are hired and paid monthly. The customer is on net-60 terms. For the first two months of the contract, the business is cash flow negative despite being profitable — it's paying staff before receiving customer payments.
The businesses that navigate this well have modelled the working capital impact of growth before it happens. They understand their CCC well enough to forecast: "if we close this contract, we need €X in additional working capital to fund the first 90 days." That insight allows them to either negotiate a deposit from the customer, draw on a credit facility in advance, or simply price the contract to reflect the working capital cost.
The businesses that don't model this discover the problem when the bank balance starts to look alarming in month two of what should have been a banner quarter.
When working capital management requires external financing
Even with optimised working capital processes, some business models require external financing to fund the operating cycle. Invoice financing and asset-based lending exist specifically for this purpose.
Invoice financing (factoring/discounting) allows you to unlock the cash in unpaid invoices — typically 80–90% of the invoice value — within 24–48 hours of issuing the invoice. The cost (typically 1–3% of invoice value per month) needs to be weighed against the working capital benefit, but for businesses with significant enterprise customers on extended payment terms, it can be a cost-effective way to fund growth.
Revolving credit facilities provide a pool of capital you can draw and repay as needed — functioning as a buffer for working capital fluctuations rather than a fixed-term loan. Maintaining a revolving facility (even if undrawn) gives you optionality when working capital requirements spike unexpectedly.
The key principle: working capital financing is a tool for managing the timing mismatch between cash out and cash in. It is not a substitute for fixing the underlying working capital cycle. Borrow to bridge the gap while you improve the processes — don't borrow indefinitely to fund an inefficient operating cycle.
FAQs
What is a healthy working capital ratio for an SMB? A current ratio (current assets divided by current liabilities) between 1.5 and 3.0 is generally considered healthy. Below 1.0 means current liabilities exceed current assets — which can be fine for structurally negative working capital businesses but is a warning sign for others. Above 3.0 may suggest excess capital tied up in the operating cycle.
How often should I review working capital metrics? Monthly, as part of the standard management accounts review. DSO in particular should be tracked against a rolling 3-month average to distinguish seasonal fluctuations from structural changes in collection behaviour.
Should working capital be part of my financial model? Absolutely. Many early-stage financial models include a P&L and cash flow statement but don't model working capital movements properly — which means the cash flow statement is unreliable. A properly integrated 3-statement model will include a working capital schedule that captures AR, inventory, and AP movements and their impact on operating cash flow.
BB Financial Services Kft helps SMBs and startups diagnose and improve working capital efficiency as part of a broader cash flow management function, with receivables and payables run through our accounting and monthly close service. Get in touch if your business is profitable but cash feels tight.