Skip to content
Guides · Small business owners · Updated August 2026

Small business rule: what changes on your invoices

The small business rule (Kleinunternehmerregelung, § 19 UStG) changes how VAT appears on your invoices – not your bookkeeping. Clients, services and payments need to be just as traceable for you as for anyone else. Here’s what really changes on your invoices, which thresholds count and what to check before sending.

What the rule means in practice

The small business rule is a VAT simplification. It doesn’t mean you don’t have to record income or write invoices. Your invoice still has to describe the transaction clearly and contain the legally required details.

For clients, the missing VAT line can be an important difference. In B2B business, clear wording helps so the recipient doesn’t automatically count on reclaiming input VAT.

Don’t mix up thresholds and years

Revenue thresholds refer to statutory periods and can be changed by reforms. A number from an old template or a blog post is not a safe basis for your decision.

Check your total revenue, how the previous year is classified and the expected development. In case of a switch, a threshold being exceeded or special types of revenue, the question belongs with your tax advisor.

  • Check the current legal basis
  • Look at previous-year and current-year revenue separately
  • Don’t confuse thresholds with profit
  • Document changes

Invoice without VAT

On a small business invoice, VAT is not shown separately. Instead, the document needs a clear note on the tax exemption. Don’t use standard wording that also shows a tax rate or tax amount.

Net and total amounts can be labeled differently in the layout. What matters is that the client can clearly see the amount payable and that the invoice doesn’t give the impression of VAT being shown without entitlement.

E-invoicing and small business owners

Small business owners can also deal with e-invoices, for example as recipients or in certain business cases. PDF, XRechnung and ZUGFeRD are not automatically interchangeable. Agree the required format with the recipient and keep the original data.

Software can prepare the note and the output. It doesn’t decide whether your specific service falls under an exception or which transitional rule applies to you.

Check before sending

Check sender, recipient, service, date, amount, invoice number and the small business note. If your status changes, update the settings for new invoices and leave older documents unchanged.

A short, documented check is worth more than the most complicated template possible. When in doubt, the legal text and your tax advisor take precedence over a general online explanation.

A worked example without false certainty

Suppose you invoice a business client €800 for a consulting service and apply the small business rule (Kleinunternehmerregelung). The invoice amount must not be increased by VAT on top. Instead, the document carries an understandable note on the tax exemption. The exact wording, and the question of whether the rule applies in your case, belong in a professional review.

If your classification changes during the year, new invoices may follow a different scheme. Set the date of the change, check open drafts and change only future documents. A central setting with a preview helps with this, but it doesn’t remove the need to assess your status correctly.

  • Show the amount without separately stated VAT
  • Keep the note on the tax exemption visible
  • Check the date of the change and open drafts

Avoid typical mistakes before sending

Check whether an old template still contains a tax rate or tax amount. Also check whether the tax number used, the client name and the service description belong to the current business. With e-invoices, these details must match both in the visible representation and in the structured data.

A list of search results can explain terms to you, but it can’t make an individual decision for you. For thresholds, mixed revenue, EU services or a change in how you are taxed, the current official source and your tax advisor are authoritative.

Sources and context

Legal and tax rules can change. What counts are the current primary sources and your professional advice.

The next step

Put this into practice on your very next job.

Test Sumaro with a real client case and take it from estimate or invoice through to payment. Free for 30 days, no contract.