Invoicing without a VAT number: what consultants must know

The question sounds simple: what happens if you invoice without a VAT number? The answer is not. It depends on whether you are legally required to have one, who your client is, and which country's rules apply. Get it wrong and you either under-charge (and absorb tax you owe) or over-charge (and create a liability you cannot actually remit). This guide walks through the cases a solo or two-person consultancy actually hits in practice.

When you do not need a VAT number at all

Most EU countries set a threshold below which VAT registration is optional. In Germany it is €22,000 annual turnover; in the UK (HMRC) it is £90,000. If you are below your domestic threshold and you have not voluntarily registered, you are a small business exempt from VAT. You invoice without a VAT number and you do not charge VAT. Simple.

The invoice wording that protects you varies by jurisdiction, but the pattern is consistent:

"VAT not applicable — small business exemption (§19 UStG)" (Germany) "No VAT charged — below UK VAT registration threshold" (UK)

That note is not optional. Without it, clients in some jurisdictions will flag the invoice for missing VAT information and delay payment while they chase clarification. Add the note, and the question never arises.

What you cannot do

You cannot charge VAT on an invoice if you are not registered. If a client pays an invoice that includes a VAT line and you are not registered, you have collected tax you are not entitled to and cannot remit. HMRC and EU tax authorities treat this as a serious error, not an honest mistake. The corrected invoice goes back to the client; you refund the VAT amount. It is uncomfortable and creates a paper trail. Avoid it.

The EU B2B cross-border case (this is where it gets real)

Here is the situation that trips up consultants far more often than the threshold question: you are VAT-registered in an EU country, and your client is a US or UK corporation. Or you are EU-based but not yet registered, and your client is a German GmbH or a French SAS.

EU consultant invoicing a US corporate: No VAT at all. The supply is outside the EU VAT system. Your invoice should note the service and confirm the client's country. No reverse-charge note is needed here because reverse charge applies within the EU B2B framework. Your invoice is clean: net amount, your legal name, client name, date, payment terms.

EU consultant invoicing another EU business (B2B): This is where reverse charge applies. If you are VAT-registered in France and your client is a VAT-registered business in the Netherlands, you do not charge French VAT. You issue the invoice net and add the note:

"Reverse charge — VAT to be accounted for by the recipient pursuant to Article 196 of Council Directive 2006/112/EC."

That one line shifts the VAT obligation to your Dutch client. You collect nothing. They account for it in their own VAT return. Miss that note and you have issued a non-compliant invoice. Some corporate accounts payable departments will reject it outright; others will pay and create an audit problem for both of you.

EU consultant invoicing EU consumers (B2C): You charge VAT at your own country's rate regardless of where the consumer is located (below the €10,000 OSS threshold). Above that threshold, you may need to register for the EU One-Stop Shop. This is a separate conversation and rarely applies to high-value B2B consulting.

What actually happens when you get it wrong

Tax authorities are not lying in wait for sub-threshold freelancers who forgot a compliance note. But the consequences do scale with the size and pattern of the error.

Charged VAT without a number: HMRC and EU authorities will require you to repay the VAT collected. If you cannot because you spent it, the liability is yours. There is no "it was a mistake" defence for amounts actually collected from clients.

Missed reverse-charge note on a B2B EU invoice: Your invoice is technically non-compliant. Most corporate clients will flag it. The practical fix is to issue a credit note and a corrected invoice. It delays payment. On a $18k monthly retainer with a NET 60 term, a two-week invoice correction cycle is painful.

Invoiced without any note when below threshold: The lowest-risk error. The invoice is valid; you just create ambiguity. Add the exemption note retroactively via an amended invoice if you need to, and add it to your template going forward.

Practical invoice checklist for consultants

Before sending any invoice, run through this in under 60 seconds:

• Are you VAT-registered? If yes, your VAT number must appear on every invoice.
• Is the client EU B2B? If yes and you are registered: reverse-charge note, zero VAT charged.
• Is the client outside the EU? If yes: no VAT, no reverse-charge note needed.
• Are you below your domestic threshold and not registered? If yes: exemption note, no VAT line.
• Any expense reimbursements on the invoice? Confirm whether those attract VAT separately in your jurisdiction.

That is five questions. They cover 95% of the situations a solo consultant faces.

Getting the invoice wording right from day one

The wording on an invoice is a legal statement, not a formality. "No VAT" is not enough. "Reverse charge applies" without the directive reference will be rejected by some AP departments. The specific text matters.

Build your standard templates now, before the edge case arrives. If you are on ZenPay, the reverse-charge VAT toggle outputs the compliant Article 196 wording automatically. For the exemption note, edit your email template once and it carries through to every invoice you send.

What happens if you invoice without a VAT number and you do not need one? Nothing, as long as the invoice says so clearly. What happens when you charge VAT you are not entitled to? That takes considerably longer to fix. The difference is a single line of text added before you hit send.