Payments, cash flow and bookkeeping

How to Track Outstanding Customer Payments (With an Ageing Example)

Track outstanding customer payments with a receivables list and an ageing report, set reminder steps and use MSME protections. Worked example included.

An accounts receivable ageing chart with five bars, from not yet due to more than 90 days overdue, the oldest in red

Quick answer

To track outstanding customer payments, list every unpaid invoice with its due date and balance, group them by how many days they are overdue (an ageing report), review the list every week and follow a fixed reminder sequence. Chase the oldest and largest amounts first. If you are a registered micro or small enterprise, MSME rules on delayed payments strengthen your position.

What counts as outstanding

An outstanding amount, or receivable, is anything you have invoiced but not yet received. It includes invoices not yet due, overdue invoices and the unpaid balance of part-paid invoices.

Build a receivables list

For each open invoice, record the invoice number, client, invoice date, due date, total, amount received and balance. Update it every time money arrives. Our guide to tracking payments from many clients shows the columns in detail.

Read it as an ageing report

Group the balances by days past the due date:

  • Not yet due.
  • 1 to 30 days overdue.
  • 31 to 60 days overdue.
  • 61 to 90 days overdue.
  • More than 90 days overdue.

The older the bucket, the lower the chance of collecting it.

A receivables ageing table for three clients, with balances in five columns from not yet due to more than 90 days overdue, totalling ₹7,20,000
Group balances by days overdue to see which ones need attention first.

Worked example

An IT services firm in Nagpur has ₹7,20,000 outstanding. Here is the action plan for each bucket:

BucketAmountAction
More than 90 days₹60,000 (one client)Call the client's finance head, propose a payment plan, pause new work
61 to 90 days₹90,000Final written reminder, referring to the agreement
31 to 60 days₹1,50,000Firm reminder with the invoice attached
1 to 30 days₹1,80,000Polite reminder asking for the payment date
Not yet due₹2,40,000Friendly heads-up 3 days before the due date
Collection actions by ageing bucket: a call for 90-plus days, a final notice at 61 to 90, firm and polite reminders for newer debts and a heads-up before the due date
The older the debt, the firmer the action.

Templates for each of these messages are in how to write a polite payment reminder.

Key numbers to watch

  • Total outstanding compared with your monthly sales.
  • Share overdue: in the example, ₹4,80,000 of ₹7,20,000 (67%) is overdue, which is high.
  • Average collection days: how long clients take to pay, on average.

MSME protection on delayed payments

If you are registered on Udyam as a micro or small enterprise, the MSMED Act requires buyers to pay within the agreed period, which cannot exceed 45 days from accepting your goods or services (or 15 days if nothing was agreed). Late payments attract compound interest at three times the bank rate notified by the RBI, and you can file a case on the MSME Samadhaan portal for the facilitation council to resolve. Mention your Udyam number on your invoices so buyers know.

Prevent tomorrow's overdue invoices

  • Take advances on projects; see advance and partial payments.
  • Agree payment terms in writing.
  • Invoice promptly after delivery.
  • Confirm the finance contact and any purchase order requirements upfront.

Common mistakes

  • Looking only at the total outstanding, not at its age.
  • Writing off debts too quickly, or never.
  • No consistent follow-up schedule.
  • Not recording part payments.

Frequently asked questions

When should I write off a bad debt?
When collection is unlikely after reasonable efforts. Discuss the accounting and tax treatment with your CA before you do.
Can I charge interest on late payments?
Yes, if it was agreed in your contract or invoice terms, and under the MSMED Act if you are a registered micro or small enterprise.
How often should I review outstanding payments?
Weekly. A quick weekly look stops small delays turning into 90-day debts.
Does GST have to be paid on invoices the client has not paid yet?
Yes. GST is generally due when you issue the invoice, not when you are paid, which is one more reason to collect promptly.

Next step

Sort your open invoices into the five ageing buckets today and act on the oldest first. PikZiy Books builds the ageing report from your invoices and payments automatically, so you see who owes what, and for how long, at a glance.

Join the PikZiy Books waitlist

Last reviewed: 22 October 2026. This article is general information, not tax, legal or accounting advice. Rules change, so confirm your situation with a qualified chartered accountant.
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