Why the format matters more than you think
A sloppy invoice doesn't just look bad, it gets paid late. Missing bank details trigger a round-trip of "account number please?" messages; no invoice number means neither of you can find it later; vague line items invite "I thought that was included" disputes. Every field below exists because someone, somewhere, lost money without it.
What every invoice in Sri Lanka should contain
The four blocks every invoice needs, check yours against this.
| Field | Why it matters | Needed? |
|---|---|---|
| Your business name, address, phone | Identifies who's billing | Yes |
| Client name (and phone) | Who owes the money | Yes |
| Invoice number | Unique reference for both sides | Yes |
| Date | When it was issued | Yes |
| Line items: description, qty, LKR price | What exactly is being charged | Yes |
| Subtotal | Total before adjustments | Yes |
| Discount | If you gave one | If applicable |
| VAT 18% | Statutory tax | Only if VAT-registered |
| SSCL 2.5% | Separate levy (optional on invoices) | Only if SSCL-registered |
| Total | The amount to pay | Yes |
| Total in words | Prevents tampering; mandatory on tax invoices | Recommended |
| Bank / payment details | So they can actually pay you | Recommended |
LKR formatting that looks right
- Prefix amounts with Rs. , "Rs. 8,500", not "8500/=".
- Use thousands separators. "Rs. 125,000" reads instantly; "Rs.125000" doesn't.
- Round to whole rupees. Cents on a Sri Lankan cash invoice look wrong, and tax invoices are conventionally issued in whole-LKR figures.
If you're VAT-registered, the bar is higher
Tax invoices issued by VAT-registered businesses carry extra requirements beyond a normal invoice: the title "TAX INVOICE", TINs of both supplier and purchaser, a prescribed serial-number format, a clear value-excluding-VAT / VAT / total-including-VAT breakdown, the total written in words, and the payment method. The exact field list comes from the VAT gazette notifications, check it against the current gazette with your accountant before issuing tax invoices, because the specifics have changed before and getting this wrong is worse than not knowing. Keep copies of every tax invoice you issue; your accountant will tell you how long the law requires you to retain them.
Numbering that won't embarrass you later
Keep it unique and sequential: INV-2026-0001, INV-2026-0002, and so on. Never reuse a number, never skip without a note. When a client calls about "invoice 47", you want to find it in seconds, not dig through a drawer. (VAT-registered businesses: use the gazette's serial format instead of inventing your own.)
Your first proper invoice in 5 steps
- Fill your business details once. Name, address, phone, the tool remembers them for every future invoice.
- Add the client and a unique number. INV-2026-0001, then 0002: never reuse a number.
- List each item separately with quantity and LKR price. One vague line ("work done, Rs. 50,000") is where disputes start.
- Add your bank details and a due date. "Payable within 7 days" turns a request into a deadline.
- Send it the day the work is done. Invoices sent within 24 hours get paid faster than ones that sit for a week.