Home › Guides › VAT on invoices

VAT on Invoices: A Simple Guide for Small Businesses

Updated October 2026 · 8-minute read

VAT (Value Added Tax) is the consumption tax used across the UK, the EU, and 170+ countries. If your business is VAT-registered, you must add it to your invoices correctly — and if you're approaching the registration threshold, you need to understand it before it applies to you. Here's the whole system in plain language.

What VAT actually is

VAT is a tax on consumption, collected in stages. Each business in the supply chain charges VAT on its sales and reclaims the VAT it paid on its purchases; the end consumer absorbs the final cost. For you as a freelancer or small business, the practical meaning is simple: once registered, you add a percentage to your invoices, collect it from clients, and pass it to the tax authority (minus the VAT you paid on business expenses).

Standard rates vary: 20% in the UK, 19% in Germany, 21% in Spain and the Netherlands, 25% in Denmark and Sweden, 5% GST in Canada (which works similarly). Always use the rate for your country and the correct rate for what you're selling — some goods and services qualify for reduced rates.

When you must charge VAT

You charge VAT on your invoices only if your business is VAT-registered. Registration becomes mandatory once your taxable turnover crosses your country's threshold — for example, £90,000 in the UK (checked annually). Below the threshold, registration is usually voluntary: some businesses register early to reclaim VAT on expenses or to look more established to corporate clients.

• Not registered? Don't add VAT to invoices. Don't write "VAT exempt" either — just omit any tax line. Adding VAT you aren't registered to collect is a serious compliance problem.
• Newly registered? You charge VAT from your registration date forward — not retroactively on earlier invoices.
• Threshold approaching? Monitor turnover on a rolling 12-month basis, not the calendar year. Crossing the threshold unnoticed and invoicing without VAT for months creates a painful back-payment.

How to show VAT on an invoice

The golden rule: never bury VAT inside your prices. Show it as its own labeled line with the rate, so the client (and any auditor) can verify the math. A VAT invoice needs:

• Your VAT registration number, printed on the invoice.
• The net amount (before VAT) — per line or as a subtotal.
• The VAT rate applied (e.g., "VAT 20%").
• The VAT amount in currency.
• The gross total (net + VAT).

If you sell items at different VAT rates, group the lines by rate and show a VAT subtotal per rate. One blended "tax" line hiding multiple rates is exactly what auditors dislike.

Your VAT number goes on every invoice

Once registered, your VAT identification number must appear on all VAT invoices — it's how the client's business reclaims the VAT you charged them. For cross-border B2B sales within the EU, you generally also need the customer's VAT number on the invoice, and the sale may be zero-rated under reverse-charge rules (more below). Missing VAT numbers are one of the most common reasons invoices get rejected by corporate accounts departments.

Standard, reduced, zero-rated, and exempt — what's the difference?

Not everything is taxed at the standard rate, and the distinctions matter for your invoice:

• Standard rate: the default (e.g., 20% UK). Most services and goods.
• Reduced rate: a lower rate for specific categories (e.g., 5% UK for domestic energy, children's car seats). Check whether anything you sell qualifies.
• Zero-rated (0%): still "taxable" at 0% — importantly, you can reclaim VAT on your related business expenses. Children's clothes and most food in the UK are zero-rated.
• Exempt: no VAT charged and you generally can't reclaim VAT on related costs. Insurance, finance, and some education/health services are exempt in many countries.

On the invoice, label zero-rated lines explicitly ("0% VAT") rather than leaving the tax line blank — a blank line looks like an error; "0%" looks deliberate.

Cross-border invoicing and reverse charge

Selling services to a business client in another EU country? Under reverse-charge rules, you typically invoice at 0% VAT and add a note like "Reverse charge — customer to account for VAT." The buyer handles the VAT in their own country. Requirements usually include: both parties VAT-registered, the customer's valid VAT number on your invoice, and the sale reported on your EC Sales List (or your country's equivalent). Services to non-EU clients are generally outside the scope of your domestic VAT — but "generally" is doing heavy lifting there, so verify for your country pair.

Common VAT invoicing mistakes

• Charging VAT before you're registered. Illegal in most jurisdictions — and clients who reclaim it will have claims rejected.
• Forgetting to charge VAT after registering. You still owe the tax authority the VAT whether or not you collected it. That 20% comes out of your pocket.
• One tax line for mixed rates. Split by rate; show each.
• Missing VAT numbers. Yours always; the customer's for cross-border B2B.
• Wrong rate for the item. Digital services, food, children's goods, and energy often have special rates — check per line, not per invoice.
• Keeping no records. VAT-registered businesses must keep invoices issued and received for years (6 years in the UK). Digital copies are fine if complete and legible — see our record-keeping guide.

VAT invoice FAQ

Do I add VAT to invoices for clients in other countries?
For B2B sales within the EU, usually 0% with reverse-charge wording and both VAT numbers shown. For clients outside the EU, usually outside the scope of VAT. For B2C (consumers), you generally charge your domestic rate. Each case has exceptions — verify yours.

What if my client isn't VAT-registered?
You still charge VAT if you're registered — the client's status doesn't change your obligation. They just can't reclaim it, which is why small non-VAT-registered clients sometimes prefer non-registered suppliers.

Can I show prices including VAT?
For B2C, yes — consumers expect VAT-inclusive prices, but the invoice should still break out the VAT amount. For B2B, quote net (excluding VAT) so the client's accounting is clean.

What happens if I cross the threshold mid-year?
You must register (usually within 30 days in the UK) and charge VAT from the registration date. Monitor turnover on a rolling 12-month basis so it never surprises you.

Key takeaways

• Only charge VAT if you're registered; only register when required or when it benefits you.
• Always show VAT as a separate labeled line: net → rate → VAT amount → gross.
• Print your VAT number on every invoice; add the customer's for cross-border B2B.
• Label zero-rated lines "0%" explicitly; split mixed rates into separate lines.
• When in doubt, a 30-minute accountant consultation beats a VAT assessment every time.