If you run a VAT-registered business in Sri Lanka, you already know that invoicing rules are changing. The Inland Revenue Department has introduced a new standardised Tax Invoice format, and getting it wrong could mean rejected input tax claims for your customers — or compliance headaches during an audit.

The good news: you don’t need to hire a developer or buy expensive accounting software to fix this. TaxCalculator.lk now offers a free, browser-based VAT Invoice Generator that creates fully formatted, downloadable tax invoices matching the latest Inland Revenue requirements — built specifically for Sri Lankan businesses.

Why Sri Lankan Businesses Need to Update Their Invoice Format

A revised and standardised tax invoice format becomes effective from 1 July 2026, following Gazette Extraordinary No. 2463/05 and Inland Revenue Circular SEC/2026/E/03. This is part of a broader push to modernise tax administration, improve audit transparency, and support digital systems like RAMIS.

Under the new rules, every tax invoice issued by a VAT-registered person must clearly show:

• A “TAX INVOICE” heading
• The supplier’s TIN and VAT registration number
• A proper serial numbering system for each invoice
• Date of invoice and date of delivery, in the prescribed format
• A clear description, quantity, and unit price for each item or service
• The applicable VAT rate
• Net amount, VAT charged, and total consideration shown separately
• The total amount written out in words
• The mode of payment (cash, bank transfer, cheque, card, mobile, or online)
• All values stated in Sri Lankan Rupees, without cents

For small and medium businesses still using handwritten books, basic Word templates, or ad-hoc Excel sheets, this is a significant operational shift — not just a formatting tweak. Many SMEs don’t currently maintain structured invoice numbering or the level of purchaser detail now required, which means there’s real risk of non-compliant invoices being issued after the new rules take effect.

Introducing the TaxCalculator.lk VAT Invoice Generator

We built this tool to take the guesswork out of the new format entirely. It’s free, runs entirely in your browser, and requires no signup.

Here’s how it works:

1. Enter your business details once — business name, address, TIN, VAT registration number, and contact information.
2. Upload your logo (optional) — your invoices look professional and on-brand from day one.
3. Add your invoice details — serial number (auto-generated or entered manually), invoice date, delivery date, place of supply, and mode of payment.
4. Add your customer’s information — name, address, and TIN/VAT number if they’re registered.
5. List your items or services — description, quantity, unit price, and VAT rate per line. The tool automatically calculates the net amount, VAT charged, and total — including the total written out in words.
6. Preview instantly — see exactly how the finished invoice will look, formatted to match the new gazetted layout.
7. Download or print — save as a PDF directly from your browser, or download a standalone HTML copy you can reopen and edit anytime.

Who Is This For?

This tool is built for:

• Small business owners issuing their own invoices without dedicated accounting software
• Freelancers and consultants registered for VAT who need professional-looking invoices fast
• Retailers and traders who need to update their invoice format ahead of the compliance deadline
• Accountants and bookkeepers managing invoicing for multiple small clients
• Startups that haven’t yet invested in a full invoicing or POS system

If your current invoice template was designed years ago — or copied from a generic source — there’s a good chance it’s missing one or more of the fields now required. Running it through our generator takes a few minutes and gives you a format you can reuse for every future invoice.

Why Use TaxCalculator.lk Instead of a Generic Invoice Template?

Most free invoice templates available online are built for international audiences and don’t reflect Sri Lankan VAT requirements at all — wrong currency formatting, missing TIN/VAT fields, no provision for the “total in words” requirement, and date formats that don’t match local conventions.

Our generator was built specifically around the Sri Lankan gazette requirements, so:

• Currency is always shown in LKR, in whole rupees as required
• TIN and VAT registration fields are built in for both supplier and purchaser
• The “TAX INVOICE” heading and layout follow the prescribed structure
• Dates follow the format specified in the gazette
• The total consideration is automatically converted to words

You focus on your business. We’ll keep the format compliant.

Try It Now — Completely Free

No registration, no credit card, no software to install. Just open the tool, fill in your business details once, and start generating professional, compliant tax invoices for every sale.

Open the Free VAT Invoice Generator →

---

Disclaimer: This tool is provided as a convenience to help VAT-registered businesses prepare invoices in line with publicly available Inland Revenue guidance. It is not a substitute for professional tax advice. Businesses should confirm their specific compliance requirements with the Department of Inland Revenue or a qualified tax advisor, particularly as implementation dates and detailed specifications may be updated by the Department from time to time.