Debtor days: what they mean, how to calculate them and how to bring them down

"Sir, sales are good. But where is the money?"

I hear this from MSME owners almost every week. The orders are coming. The invoices are going out. But the bank balance is always tight. Salaries feel heavy. Suppliers keep calling.

Very often, the money is not lost. It is sitting with customers. And the simplest number to see this is debtor days.

What are debtor days?

When you sell on credit, the customer becomes your "debtor" — they owe you money. Debtor days measure how long, on average, that money stays with them before it reaches your bank.

You may also hear other names: debtors collection period, receivable days or DSO (days sales outstanding). They all mean the same thing.

The debtor days formula

• Trade receivables: money customers owe you today for goods or services already delivered.
• Credit sales: sales made on credit in the period (not cash sales).
• Number of days: 365 for a year, 90 for a quarter, 30 for a month.

A simple example in rupees

This is an illustration, not data from a real business.

A trading business makes ₹1.2 crore of credit sales in a year. At year end, customers owe it ₹20 lakh.

Debtor days = (₹20,00,000 ÷ ₹1,20,00,000) × 365 = about 61 days.

Now the important question: what credit period does this owner give? If it is 30 days, customers are paying about a month late. That gap is money the owner is funding — often with an overdraft and interest.

Here is the good news. If the same business brings debtor days down from 61 to 45, receivables drop to about ₹14.8 lakh. That frees roughly ₹5 lakh of cash — without one extra sale.

What your debtor days are telling you

Compare with your own credit terms

The best comparison is not another company. It is your own promise. Debtor days close to your credit period means customers are paying as agreed. Much higher means you have a collection problem.

Watch the trend, not one number

Calculate it every month. If it moves from 40 to 48 to 55, something is changing — a big customer slowing down, or follow-ups being missed. Catch it early.

High sales, low cash

Fast-growing businesses often feel poorer, because every new sale adds to receivables first. That is why profit and cash flow are not the same thing.

8 practical ways to reduce debtor days

1. 1. Agree the terms before you deliver

   Write the credit period on the quotation, the order and the invoice. "Payment in 30 days" should never be a surprise.

2. 2. Send the invoice the same day

   Every day the invoice sits on your desk is a day added to your debtor days.

3. 3. Remind before the due date

   A polite WhatsApp message three days before the due date works better than an angry call 30 days after it.

4. 4. Make one person responsible

   If collections are everyone's job, they are nobody's job. Give one person a weekly list and a target.

5. 5. Review an ageing list every week

   Sort customers into 0–30, 31–60, 61–90 and 90+ days. Call the oldest first.

6. 6. Reward early payment

   A small discount for paying early can cost less than borrowing to cover the gap. Do the maths first.

7. 7. Stop supplying chronic late payers

   Put new orders on hold, or ask for an advance, until old dues are cleared.

8. 8. Make paying easy

   Put UPI and bank details on every invoice. Remove every excuse.

Debtor days are one part of a bigger picture

Money also gets stuck in stock (inventory days) and goes out to suppliers (creditor days). Put all three together and you get your cash conversion cycle — how long it takes for one rupee spent to come back as cash.

Try the free cash conversion cycle calculator. It works out your debtor days for you. Then read the cash flow management guide for MSMEs and working capital management for MSMEs.

My simple rule is Track. Control. Scale. Track your debtor days every month. Control them with clear terms and steady follow-up. Only then scale your sales.

Frequently asked questions

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