Invoicing and Payment Collection: A Founder’s Playbook for India

One of the quietest causes of cashflow stress in Indian B2B businesses is sloppy invoicing and reactive collections. Cleaner invoices get paid faster; clearer collection processes reduce the time you spend chasing payments. This is the operational playbook we have seen work.

What a clean GST invoice looks like

A GST-compliant tax invoice must have:

• Supplier name, address, and GSTIN.
• Invoice number (consecutive, financial-year-aware) and invoice date.
• Customer name, address, and GSTIN (for B2B).
• HSN/SAC code for each line item.
• Description, quantity, unit, and unit price.
• Taxable value, tax rate, and tax amount split into CGST + SGST or IGST.
• Total amount in figures and words.
• Place of supply (state of the recipient — determines IGST vs CGST/SGST).
• Signature or authorised digital signature.

Missing any of these can cause input tax credit issues for your customer. Customers will then ask you to revise — losing you 7–14 days. Set up your template once, automate the rest.

E-invoicing thresholds

If your turnover exceeded ₹5 crore in any past financial year, you must generate e-invoices through the Invoice Registration Portal (IRP) for all B2B invoices. The portal returns an Invoice Reference Number (IRN) and a QR code that you embed on the invoice. Without this, the invoice is invalid for GST purposes.

If you are below the threshold, you can still issue e-invoices voluntarily and most large customers prefer it.

Software that gets out of your way

For under ₹5 crore turnover, the practical options are:

• Zoho Books — built-in GSTR-1 export, e-invoicing, payment links via Razorpay/Stripe. ₹999/month tier covers most small teams.
• Xero with GST add-on — cleaner accounting workflows, weaker on Indian compliance specifics.
• Tally Prime — what your CA uses; manual but bulletproof. Best if your finance is fully outsourced.
• Built into your product — for D2C / SaaS where invoices are auto-generated, integrate Razorpay Invoices, Cashfree, or build on a billing platform like Chargebee.

Payment collection: design for default speed

Most businesses chase payments after they're late. Better businesses make paying easier than not paying.

Embed a payment link on every invoice

Razorpay, Cashfree, PhonePe, and PayU all generate per-invoice payment pages that accept UPI, cards, net banking, and wallets. The QR code goes on the invoice. The customer can pay in 30 seconds from their phone — no NEFT delays, no UTR mismatches, no "did you receive it?".

Set explicit terms

"Payable within 30 days" is the default. For larger invoices, consider "5% discount for payment within 7 days" — small carrots beat large sticks. For first-time customers, ask for advance or milestone payments.

Automate the reminder ladder

• 3 days before due date: Friendly reminder over email.
• Day after due date: Polite "is there anything blocking payment?" note.
• 7 days late: Formal reminder with restated due date.
• 15 days late: Phone call, escalate to your point of contact's manager.
• 30 days late: Pause new work, send formal demand letter.

Most invoicing software has a built-in reminder ladder. Use it — automated reminders feel less awkward than manual ones, both for the sender and the recipient.

The metric to watch: DSO

Days Sales Outstanding = (Accounts Receivable / Total Credit Sales) × Number of days. For a healthy B2B services business in India, target DSO of 30–45 days. Above 60 days indicates a real collections problem.

Track it monthly. If DSO is creeping up, your collection process needs more friction-reduction (better payment links, faster invoice issuance) or more discipline (the reminder ladder is being skipped).

The hidden cost: TDS

Indian B2B customers will deduct TDS (typically 10% on professional services) from your invoice. You receive 90% in cash, the other 10% becomes a credit you claim against your own income tax liability.

Two practical implications:

• Your cash inflow is 90%, not 100%, of the invoice. Plan cashflow accordingly.
• Reconcile TDS quarterly using Form 26AS — don't wait for year-end. Mismatched TDS credits are a common source of refund delays.

The lesson

Most invoicing pain isn't a tax problem — it's an operational discipline problem. Set up clean templates, automate reminders, embed payment links, and track DSO. Three afternoons of work pays back for years.