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Shopify invoice tax and VAT: what to check

Checked against the live sources below on 27 October 2026.

Check that an invoice shows what the customer actually paid, each tax line, your business name and tax registration number where one applies, a unique invoice number and the date. Which fields your law requires depends on where you and your customer are, so confirm them with your accountant. This is a checklist, not tax advice.

A checklist to look at

Totals. Does the invoice match the payment, including shipping, discounts and tax?
Tax lines. Is the tax shown separately from the price, in the way your accountant expects?
Your tax ID. If you are registered for VAT, GST or similar, is the number on the page?
Numbering. Is each invoice number unique and in a sequence? Gaps are easier to spot when numbers run in order.
Dates and currency. Order date, invoice date and currency should be clear.
The customer. Business customers often need their own name, address and tax ID on it.

What the sources say

Shopify’s pricing page lists automated sales tax calculations, tax liability tracking, and VAT validation, exemptions and invoicing among its tax features, and its plan comparison table marks all three as included on Basic, Grow, Advanced and Plus (an advanced tax platform is a separate add-on). Its tooltip describes the VAT feature as validating VAT numbers, automating exemptions and issuing VAT invoices for EU and UK sales. Included in a plan does not mean it covers your obligations, so confirm that with your accountant. FlatInvoice’s listing says it is tax-ready with a VAT/GST tax ID line and automatic sequential numbering, and that every invoice shows what the customer paid at the time of the order. Order Printer’s listing mentions invoice numbers among its customisation options.

A ten-minute review of your own invoice

Place a test order in your store for a small amount.
Open the invoice the customer would receive.
Compare the total to the payment on the order.
Check each tax line against what your accountant told you to expect.
Check that your registration number and business details are right.
Compare the invoice number with the previous one.
Send a copy to your accountant once and ask what, if anything, is missing.

Repeat the review whenever you change tax settings, add a market or switch invoice tools. A fix at this stage costs nothing; a fix after a customer or an auditor spots it does not.

What a tool cannot decide for you

An app can print a field. It cannot tell you whether your business must charge a tax, which fields your tax authority requires, or whether your country mandates a specific electronic invoice format. If you may need such a format, look for a tool that names it; FlatInvoice’s listing does not mention one.

See how FlatInvoice handles the tax ID line and numbering.

FlatInvoice for Shopify Install on Shopify

Frequently asked questions

Does a FlatInvoice invoice meet my country’s VAT rules?

We cannot say. The listing describes a VAT/GST tax ID line and sequential numbering; whether that satisfies your rules is a question for your accountant.

Should invoice numbers be sequential?

Sequential numbers make gaps visible, which helps with bookkeeping. Whether your law requires it is for your accountant.

Where do I enter my VAT or GST number?

In FlatInvoice, the listing says a tax ID line is included; the app’s setup screen shows where to enter it.

How this page was researched

Read on 27 October 2026. Tool features come from their live listings and Shopify’s pricing page. The checklist is general; no part of this page is tax or legal advice.

Shopify pricing — its comparison table marks automated sales tax calculations, tax liability tracking, and VAT validation, exemptions and invoicing as included on Basic, Grow, Advanced and Plus (advanced tax platform is an add-on); up to 3 B2B catalogs on Basic, Grow and Advanced
FlatInvoice on the Shopify App Store — free Starter plan (25 invoices a month, every feature); Flat Plan with a 7-day free trial; invoices email themselves when an order is placed; Download-invoice button setup; VAT/GST tax ID line and sequential numbering
Shopify Order Printer on the Shopify App Store — free app from Shopify for pick lists, packing slips, invoices and receipts; templates customised with HTML, CSS and Liquid; bulk printing of up to 50 orders

Disclosure. FlatInvoice is our app (Stelar Digital LLC). This page was written with AI tooling and checked against the sources listed above; we would rather you pick the right tool than ours.

Not tax or legal advice. Stelar Digital is not a tax adviser or law firm. Tax rules differ by country and change; confirm what your invoices must show with a qualified accountant or your tax authority.