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Working Capital Management for Growing Startups: The Cash Conversion Cycle and Optimisation
Lekha Editorial Team
CA-reviewed · Published
Working capital is the cash tied up in the day-to-day operations of a business — money that's been spent (on inventory, services delivered to customers not yet paid) but not yet returned as cash. Poorly managed working capital can cause a profitable company to run out of cash. Understanding and optimising the cash conversion cycle is one of the highest-ROI CFO activities.
The Cash Conversion Cycle
Cash Conversion Cycle (CCC) = Days Sales Outstanding (DSO) + Days Inventory Outstanding (DIO) - Days Payable Outstanding (DPO)
DSO: the average number of days between issuing an invoice and receiving payment. If you invoice ₹10 lakh and your average receivables balance is ₹5 lakh, your DSO is (₹5 lakh / ₹10 lakh) × 30 = 15 days. A lower DSO means faster cash collection.
DIO: relevant for product companies. The average number of days inventory sits before being sold. Service and SaaS companies have zero or minimal DIO.
DPO: the average number of days you take to pay your suppliers. A higher DPO means you're using supplier credit — delaying payment to preserve cash. Balance this with maintaining good supplier relationships.
CCC = DSO + DIO - DPO. A negative CCC means you collect money from customers before paying suppliers — a cash-generative working capital model (Amazon, and most SaaS with annual upfront billing). A positive CCC means you're financing the gap from your own cash.
For an Indian B2B software company with net-30 invoicing (DSO ~40 days), no inventory, and net-45 payables (DPO ~45 days): CCC = 40 + 0 - 45 = -5 days — slightly negative, cash-generative.
Receivables Management
Receivables represent money you've earned but haven't collected. For most B2B startups, receivables are the single largest working capital drain.
DSO reduction strategies:
Shorter payment terms: move customers from net-60 to net-30, or net-30 to net-15. Enterprise customers often negotiate longer terms; holding firm on payment terms while negotiating other concessions is a useful negotiating approach.
Upfront payment for annual subscriptions: offer a 10–15% discount for customers who pay their annual subscription upfront rather than monthly. The discount is usually worth it — you get 12 months of cash in month 1 instead of month 12.
Automated collection reminders: most invoicing software can send automated reminders at 7 days before due date, on the due date, and at 7, 14, and 30 days overdue. Automated reminders are less awkward than personal calls for small amounts and create a consistent follow-up rhythm.
Deposits for new customers: require a 25–50% deposit from new customers before starting work, particularly for project-based engagements. This reduces credit risk and improves cash flow for the delivery period.
Payables Optimisation
Payables optimisation means using your suppliers' credit terms to the maximum extent possible without damaging relationships or incurring late payment penalties.
Know your vendor terms: many vendor invoices have standard terms that you can legitimately pay at the end of (net-30, net-45). Some companies habitually pay immediately when received — paying on day 5 of a net-30 invoice is giving up 25 days of free credit.
Strategic early payment: take early payment discounts (e.g., '2/10 net 30' — 2% discount if paid within 10 days) when the implied annualised return (2% for 20 days ≈ 36% annualised) exceeds the cost of your capital. This is almost always worth taking.
Vendor payment schedule: batch vendor payments to twice-monthly disbursement dates. This creates predictability for your cash flow planning and prevents ad-hoc payments that bypass the approval process.
Monthly credit from SaaS vendors: most software subscriptions allow payment on a monthly billing cycle with a standard net-7 payment term. Annual prepaid subscriptions reduce monthly management overhead but reduce the credit period benefit.
Key takeaway
Working capital management is not the most exciting part of financial management, but it's often where the most cash is recoverable — reducing DSO by 15 days on ₹1 crore of receivables frees ₹50 lakh of cash that was sitting in your debtors ledger. The CFO who optimises working capital gives the business weeks of additional runway for no additional capital cost.
Frequently asked questions
Why would a profitable startup run out of cash?
Working capital is the primary reason. A company can show net profit on its P&L but have declining cash if: revenue is growing (creating more receivables that aren't yet collected), inventory is building (for product companies), or payables are being paid faster than they need to be. Rapid growth consumes cash through working capital even when each transaction is profitable. This is the 'profitable but out of cash' paradox that catches many founders by surprise.
How does an annual SaaS subscription model affect working capital?
Annual subscriptions paid upfront create negative working capital — the company receives 12 months of cash in advance and delivers the service gradually. This is the ideal working capital structure. The accounting shows a deferred revenue liability (the obligation to deliver the service), but the cash is in the bank. This negative CCC is one of the reasons high-gross-margin SaaS businesses can grow without consuming significant capital.
What is a debtor ageing report and how should it be used?
A debtor ageing report lists all outstanding receivables organised by how long they've been outstanding: 0–30 days, 31–60 days, 61–90 days, and 90+ days. The CFO reviews this weekly. Invoices in the 0–30 bucket: monitor for upcoming due dates. Invoices in the 31–60 bucket: active follow-up by the finance team. Invoices in the 61–90 bucket: escalate to the relationship owner (CEO or account manager). Invoices in the 90+ bucket: evaluate whether to write off as bad debt, engage a collection service, or take legal action.
How should a startup handle a large customer who consistently pays late?
Three-step approach: first, discuss payment terms directly with the customer's finance team — sometimes late payments are procedural (their AP process requires a PO number you didn't include, or they batch payments monthly). Second, negotiate a structured payment plan if the customer is genuinely cash-constrained. Third, for persistently late payers, require advance payment or shorter payment terms as a condition of renewal. Losing a slow-paying customer whose receivables absorb significant cash can be cash-flow positive even if it reduces revenue.
At what revenue level should a startup start formal working capital management?
From the first significant customer. The habits of issuing invoices promptly, following up on overdue receivables, and paying suppliers on optimal terms are best established early. However, the formal reporting (weekly DSO monitoring, debtor ageing analysis, CCC tracking) typically becomes relevant around ₹50 lakh monthly revenue, when the absolute cash amounts involved make optimisation material to the business's cash position.