Tax guide
Tax Guide for Invoicing
Tax is the part of invoicing that scares people the most, but the principles are simple. This guide compares the three major indirect tax systems, shows you how to display tax correctly on an invoice, explains exemption, reverse charge and the digital services tax, and sets out the record-keeping habits that will save you during an audit.
Sales tax vs VAT vs GST
Levied only at the final retail sale to the end consumer, collected by the seller and remitted to the authority. Common in the United States and parts of Canada. Rates vary widely by state, county and city, and sellers must track where the customer is located to apply the right rate.
Levied at every stage of the supply chain, with each business charging VAT on its sales and reclaiming VAT paid on its purchases. Used across the EU, UK, much of Africa and the Middle East. Invoices must show the supplier's and customer's VAT numbers and a clear VAT line.
Conceptually similar to VAT — multi-stage, input-tax-credit based — but the name used in India, Australia, Singapore, Canada, New Zealand and elsewhere. Specific rules vary, especially around place of supply, reverse charge and filing frequency.
The key practical difference: under sales tax, only the final seller charges tax, so the same item reaches the consumer having been taxed once. Under VAT and GST, every business in the chain charges tax on its sale and reclaims tax on its purchase, so the tax authority collects revenue at every stage while the total tax burden on the consumer is the same.
How to show tax on an invoice
Tax must be visible, labelled and mathematically correct. At a minimum, show the tax rate, the tax amount and the total inclusive or exclusive of tax. If you sell items at different rates, group them by rate so the customer can see exactly how each line contributes to the total tax.
VAT and GST invoices almost always require your tax identification number and, for B2B sales, the customer's. Some jurisdictions require line-item tax; others allow a single tax line on the subtotal. When in doubt, itemise — it is harder to challenge and easier to reconcile.
State the currency clearly so the tax figure is unambiguous, especially for cross-border invoices. If you are quoting prices tax-inclusive in some markets and tax-exclusive in others, label the convention on every invoice to avoid disputes.
Tax exemption and zero rating
Exempt supplies are outside the scope of tax entirely — no tax is charged, and crucially, no input tax credit is available on the inputs that went into making them. Common examples include certain financial services, healthcare and education. Zero-rated supplies, by contrast, are taxable at 0%: no tax is charged, but input credit is still available. Exports are typically zero-rated, which is why exporters often receive refunds of the input tax they paid. The distinction matters enormously for cash flow, so confirm the correct treatment for every line of business you operate.
Reverse charge
Under reverse charge, the liability to pay tax shifts from the supplier to the recipient. The supplier issues an invoice without charging tax, marks it as reverse charge, and the recipient self-accounts for the tax in their own return — claiming input credit at the same time if eligible. Reverse charge is common for B2B services between EU member states, for imports of services in many GST jurisdictions, and for specific goods such as scrap metal, cashew nuts and tobacco in India. Failing to apply reverse charge when required, or applying it when not required, both lead to compliance headaches — so confirm the rule for the specific service and country before invoicing.
Digital services tax
Many jurisdictions now tax digital services — software subscriptions, streaming, online advertising, digital marketplaces — even when the supplier has no physical presence in the country. The EU's VAT on electronic services, the UK's digital services tax, India's equal levy and similar rules in dozens of countries mean that a small SaaS business can suddenly have tax obligations in markets it never intended to enter. The practical response is to use a merchant of record or a tax-compliance service that registers, charges and remits tax on your behalf in every jurisdiction, or to register under the small-supplier simplification schemes some countries offer for cross-border digital sales.
Keeping records
- Keep every invoice you issue and receive for the statutory retention period, usually five to ten years.
- Store invoices in a format that is readable years later — PDF is safer than a proprietary accounting format.
- Reconcile issued invoices against bank deposits every month so unpaid items are visible early.
- Match purchase invoices against tax-authority auto-populated statements before filing returns.
- Note the place of supply for every cross-border transaction to defend your tax treatment.
- Back up records offsite; a single laptop failure should never erase your tax history.