Why was our best month so hard on cash?

A big month feels good. New customers, a revenue record, a screenshot worth sharing. It is also the month most likely to be quietly hiding a problem, because it is the month you are least likely to look closely at.

The reason is not mysterious. In any business that gets paid after it delivers, growth is funded by you first and reimbursed by the customer later. The bigger the month, the bigger the gap you are funding.

Where the money actually goes in a record month

Three things happen at once, and only one of them is visible on the P&L.

1. 01You spend to deliver. More orders means more stock, more contractor hours, more support load, more payment gateway fees. That cash leaves in the same month the revenue is recorded.
2. 02You owe tax on what you invoiced, not on what you collected. GST is charged on the invoice, and the monthly return falls due on the 20th of the following month. A record month raises a record GST liability, payable whether or not a single one of those invoices has been settled.
3. 03You collect last. If your terms are 30 or 45 days and your customers treat those as suggestions, the cash from your best month arrives in the quarter after the one that made you feel successful.

None of that is a failure. It is arithmetic. But it means the month that looks strongest in the accounts can be the month with the least room in the bank, and the founder is usually looking at the wrong one of those two numbers at the time.

A worked example

Illustrative figures, not a client. Take a services business invoicing ₹40 lakh in a normal month and ₹60 lakh in a record one, on 45-day terms, with delivery costs running at roughly 60% of revenue.

• ·Delivery cost on the extra ₹20 lakh of revenue is about ₹12 lakh, and most of it is paid inside the month.
• ·GST on the full ₹60 lakh becomes payable by the 20th of the next month.
• ·The ₹60 lakh itself starts arriving from day 45 onwards, assuming nobody is late.
• ·Customers deducting TDS pay you slightly less than you invoiced, and you recover the difference against tax much later.

So the record month costs more, taxes more and pays later. Run two of those back to back and a profitable business can be looking hard at its overdraft.

The numbers that catch it

The metrics that catch this are not the ones on the celebration slide.

• ·Days sales outstanding, month by month rather than as an annual average. A rising DSO in a growth month is the single clearest signal.
• ·Cash conversion: what proportion of the month's invoiced revenue actually landed in the bank within the month.
• ·Gross margin on the incremental revenue, not the blended figure. The last ₹20 lakh often carries a worse margin than the first ₹40 lakh, because it was won on a discount or served with overtime.
• ·Refund and rework rates, and support response times. A month hit by cutting a corner will show up here before it shows up in revenue.
• ·Statutory dues owed but not yet paid, held separately from the bank balance so they never read as available cash.

What to do about it

The fix is rarely to grow more slowly. It is usually one of three things, in ascending order of difficulty.

1. 01Change the timing. Advances, milestone billing, or invoicing on dispatch rather than at month end all move cash earlier without touching the price.
2. 02Change the collection. Most late payment in India is process rather than intent: the invoice went to the wrong person, the purchase order number was missing, nobody chased it. A named owner and a weekly ageing review recovers more cash than a pricing change.
3. 03Change the funding. If the working capital gap is structural and the unit economics are sound, that is a financing question rather than an operational one, and it is worth treating as such before it becomes urgent.

None of this means fast growth is bad. It means the fastest-growing month deserves the same scrutiny as the worst one, because sometimes it is the same month and nobody has labelled it yet.

About Simplify

Simplify is a finance clarity and investment readiness practice working with founders across India, built on six years inside startups. We write about the questions founders bring before a decision, not after it.