VAT on invoices: a plain-English guide for freelancers and small businesses

In the UK, VAT is charged at 20% on most goods and services — including invoicing, consulting, design, and development. Whether you have to charge it depends on a single threshold (£90,000 in 2026-27), but the rules around how to display it, when to apply the reverse charge, and how to handle international clients catch most new freelancers out within their first year. This guide covers the practical mechanics, not the theory.

What is VAT, in one paragraph

VAT (Value Added Tax) is a consumption tax collected by businesses on behalf of HMRC. You add it to the price of taxable goods or services, collect it from your customer, and pay it to HMRC quarterly via your VAT return. You also reclaim VAT you have paid on business expenses, which is why most businesses end up net-neutral on VAT — it is a cashflow line, not a cost.

The standard UK rate is 20%. There are reduced rates (5% on things like children's car seats and home energy, 0% on most food and children's clothing) but these almost never apply to freelancer services. If you are invoicing for design, development, consulting, writing, photography, or any other professional service, the rate is 20%.

When do I have to charge VAT?

You must register for VAT and start charging it on your invoices when any of the following are true:

1. Your turnover in the last 12 months exceeded £90,000 (the 2026-27 threshold, frozen since 2024).
2. You expect your turnover in the next 30 days to exceed £90,000.
3. You took over a VAT-registered business as a going concern (the registration transfers with the business).
4. You voluntarily registered, even below the threshold (some freelancers do this to reclaim VAT on B2B expenses or to appear more established to clients).

You register once, online, at GOV.UK/register-for-vat. The process takes about 30 days and you will get a 9-digit VAT number (GB followed by 9 digits, e.g. GB123456789) which must appear on every invoice you issue once registered.

What an invoice with VAT must show

HMRC requires a VAT invoice to include seven fields in addition to the standard invoice fields:

• Your 9-digit VAT number, with the GB prefix (e.g. "VAT GB123456789"). Without this, your client cannot reclaim the VAT and may refuse to pay.
• A unique invoice number — sequential, no gaps. Same rule as non-VAT invoices.
• The date of supply (tax point) — usually the invoice date, but can be the date the goods were delivered or the service completed if different.
• The date the invoice was issued — if different from the tax point.
• Your business name and address — must match your VAT registration.
• Your client's name and address.
• A clear breakdown: net amount (before VAT), VAT amount (20% of net), and gross total (net + VAT). VAT cannot be hidden inside a single line item.

For most freelancer invoices, a single line item like "Consulting services — 1 day" with a net, VAT, and gross row beneath is enough. The £250 rule does not apply to most service invoices (it applies to retail supplies of goods under £250). For services, you must always show the VAT breakdown.

How to add VAT to your invoice in practice

For a 20% VAT rate, the math is: net × 0.20 = VAT. So a £1,000 net invoice becomes £1,200 gross. Three ways this gets done:

Method A: Quote net, add VAT on top

You agree a fee of £1,000 with the client. The invoice shows "Net: £1,000.00 / VAT @ 20%: £200.00 / Total: £1,200.00." The client pays £1,200. This is the standard approach for B2B services where the client reclaims the VAT.

Method B: Quote gross, extract VAT

You agree a fee of £1,200 (VAT inclusive) with the client. The invoice shows "Gross: £1,200.00 / Net: £1,000.00 / VAT @ 20%: £200.00." The math is gross ÷ 1.20 = net. This is rarer and usually only happens when a client insists on a fixed-price inclusive quote.

Method C: Reverse charge (international B2B)

You invoice a VAT-registered EU business for services. The invoice shows net + 0% VAT with the statement "Reverse charge: customer to account for VAT." The EU client accounts for the VAT on their own return via the reverse charge mechanism. The UK supplier charges 0% VAT but must still be VAT-registered.

The four common mistakes that trigger penalties

These are the four most common VAT invoice errors HMRC looks for, in order of how often they trigger enquiries:

1. No VAT number on the invoice. Without your GB number, the invoice is not a valid VAT document, the client cannot reclaim the VAT, and you cannot include the sale in your VAT return.
2. Rounding VAT to the nearest pound. VAT is calculated to the penny. A £1,000 invoice with 20% VAT is exactly £1,200.00, not £1,200 or £1,200.00 rounded. Software does this for free.
3. Charging VAT when not registered. If your turnover is below the threshold, do not charge VAT. It is a criminal offence to collect VAT you are not entitled to, even by accident. Refund it immediately and apologise.
4. Missing the tax point. If you issue an invoice in advance of the work, the tax point is the invoice date. If you issue it after, it is the date the work was completed. Getting this wrong misaligns your VAT return with when the supply actually happened.

What to put in your invoice terms

Two clauses that should appear on every VAT invoice, in addition to the standard payment terms:

• A late-payment interest clause. The statutory rate is 8% above Bank of England base rate. For B2B invoices, this is automatic under the Late Payment of Commercial Debts (Interest) Act 1998, but stating it on the invoice makes the client aware and is recoverable faster.
• A clear statement of the VAT treatment. For domestic invoices: "VAT @ 20%." For reverse-charge: "Reverse charge — customer to account for VAT." For zero-rated: "Zero-rated supply." For exempt: "VAT exempt." A clean statement eliminates ambiguity in a dispute.

How Invosi handles VAT

Invosi is built for UK and EU freelancers, so VAT is a first-class feature — not an afterthought:

• VAT registration toggle — flip it on once you register, off if you deregister. Per-company, so if you have multiple brands on the Pro plan, each can be VAT-registered or not independently.
• Automatic 20% / 5% / 0% / exempt / reverse-charge line items. Pick the rate per line, the invoice calculates the rest and shows a clean breakdown.
• VAT number on every invoice once registered. Set it once in Settings, it appears in the header of every invoice automatically.
• VAT MOSS / OSS for EU sales. If you sell digital services to EU consumers, the One Stop Shop scheme lets you register in one EU country and file a single return. Invosi flags sales that qualify.
• CSV export includes VAT per line for your accountant or VAT return. Quarterly returns, done in a spreadsheet import.

Starter is $7/mo, Pro is $12/mo, Scale is $25/mo — flat-fee USD billing, your card handles the FX. The full pricing is on /pricing.

Written by Charlotte West.