Working capital for small businesses: the cash conversion cycle explained

Ask small business owners what keeps them up at night and many will say the same thing: “We’re making profit on paper, but there’s never enough cash.” The culprit is usually working capital — and the good news is that it can be measured and managed.

What working capital is

In simple terms, working capital is the money locked into the daily running of a business:

Working capital = Stock (inventory) + Money customers owe you (debtors) − Money you owe suppliers (creditors)

Every time you buy stock, you spend cash. Every time you sell on credit, cash is delayed. Every time a supplier gives you credit, you hold on to cash a little longer. The balance of these three decides how much of your own money — or borrowed money — is tied up at any moment.

The cash conversion cycle

The cash conversion cycle (CCC) measures, in days, how long a rupee spent on stock takes to come back as cash from a customer.

CCC = Inventory days + Debtor days − Creditor days

• Inventory days: how long stock sits before it is sold.
• Debtor days: how long customers take to pay after a sale.
• Creditor days: how long you take to pay suppliers.

A shorter cycle means less cash is stuck. A longer one means you need more funding just to stand still — and even more to grow.

A worked example: a hardware trader

Take an imaginary hardware distributor in a tier-2 city. All numbers are assumptions for illustration.

Item	Assumption
Annual sales	₹1.2 crore
Annual cost of goods sold	₹96 lakh
Inventory days	60
Debtor days	45
Creditor days	30

Cash conversion cycle = 60 + 45 − 30 = 75 days.

Now convert days into rupees (using a 365-day year):

Component	Calculation	Amount (approx.)
Inventory	₹96 lakh × 60 ÷ 365	₹15.8 lakh
Debtors	₹1.2 crore × 45 ÷ 365	₹14.8 lakh
Less: creditors	₹96 lakh × 30 ÷ 365	(₹7.9 lakh)
Working capital needed		≈ ₹22.7 lakh

So this trader needs roughly ₹22.7 lakh permanently tied up just to keep goods moving — before rent, salaries or any expansion.

What if debtor days fall from 45 to 30? Debtors drop to about ₹9.9 lakh, freeing nearly ₹5 lakh of cash. No loan, no interest — just faster collection.

What if sales double but the cycle stays the same? The working capital need roughly doubles too. This is why fast-growing businesses often run out of cash: growth eats working capital.

Ways to shorten the cycle

• Collect faster. Invoice the same day, send reminders before the due date, offer a small discount for early payment where margins allow.
• Hold less stock. Track which items move slowly and reorder in smaller lots.
• Negotiate supplier terms. Longer credit from suppliers reduces what you must fund — but pay on time to keep the relationship healthy.
• Know your rights. If you supply goods or services and are a registered micro or small enterprise, the MSMED Act limits how long buyers can delay payment. See our Udyam registration guide.
• Watch GST cash flow. Input tax credit timing affects cash too — see GST basics.

Ways to fund what remains

Option	How it works	Watch out for
Own funds / retained profit	No interest, full control	Limits growth
Cash credit or overdraft	Bank limit you draw on as needed, interest on amount used	Usually needs stock and debtors as security; annual renewal
Working capital term loan	Fixed amount repaid in EMIs	Less flexible for seasonal needs
Invoice discounting / TReDS	Sell receivables from large buyers to get cash early	Discount cost; TReDS works for MSME receivables from eligible buyers
Supplier credit	Delayed payment to suppliers	Can strain relationships if stretched
NBFC or fintech lines	Quick, often unsecured	Typically higher cost — read the fine print

Interest rates and eligibility vary by lender and change with the RBI’s policy rate (see how the repo rate reaches your EMI). Compare the full cost, including processing fees, before you sign.

What to do this month

1. Calculate your own inventory, debtor and creditor days from last year’s accounts.
2. Work out your cash conversion cycle and the rupee amount it locks up.
3. Pick one lever — usually collections — and set a target in days.
4. Match funding to need: revolving credit for revolving needs, term loans for long-term assets.
5. Recalculate every quarter, especially before a big growth push.

This article is for education only and is not financial or lending advice. Consult your banker or a chartered accountant for decisions about your business.