Why invoicing gets messy in IT services
An IT agency rarely sends the same kind of invoice twice. One client pays by milestone, another by the hour, a third on a yearly AMC and a fourth on a monthly retainer. Add change requests and part payments, and it is easy to lose track of what was billed and what is still due.
This checklist covers the practical side. For tax rates, registration and filing questions, always confirm with your CA, because rules can change and depend on your situation.
What every invoice should carry
Check that each invoice has the basics:
- Your business name, address and GSTIN
- Client name, billing address and GSTIN where they have one
- Invoice number in a continuous series and invoice date
- Clear description of the service and the period or milestone
- Taxable value, tax and total, as advised by your CA
- Payment terms and due date
Match the invoice to the work
Link each invoice to the project, milestone, AMC or timesheet period it covers. When a client asks what an invoice is for, you should be able to answer in one click, not by searching through email.
For time-based work, bill from approved hours. For fixed-price work, bill against agreed milestones, and quote change requests separately before you do them.
Follow up on dues
Review outstanding invoices every week. A polite reminder a few days before the due date works better than a firm one after it. Record part payments as they come in, so your outstanding list is always right.
Working with clients in Thailand
If you also serve clients in Thailand, invoices follow Thai VAT rules instead of GST. Keep the two clearly apart and check the details with your accountant there.
Common mistakes
These cause most invoice trouble:
- Gaps or repeats in the invoice number series
- Vague descriptions such as 'IT services'
- Change requests done but never invoiced
- Part payments tracked in a separate sheet
How Akshvara helps
In Akshvara you build quotes from your own service list, turn accepted quotes into invoices and raise milestone, retainer, AMC or time-based invoices with GST for India or VAT for Thailand. You see what is paid, part paid or due on one screen. Book a free demo to see it.
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