Online invoice generator

Issuing invoices comes with tax registration and fiscal obligations. Although there are very specific exceptions in case law regarding regularity, the AEAT's general rule requires registration in the Register of Businesses (Form 036 / Form 037) to carry out economic activities. We recommend checking your situation with an advisor to avoid penalties for undeclared work.

No. A pro forma invoice is a draft or preliminary quote that has no fiscal or accounting validity and should not be numbered within the official invoice series. Only the final invoice creates an obligation to pay taxes.

It's common practice to start a new series each tax year. For example, the first invoice of 2025 would be 2025/001. This helps keep things organized and maintain the sequential order required by regulations.

For invoices sent by email (PDF), a handwritten signature isn't a strict requirement as long as the authenticity of the origin and the integrity of the content are guaranteed through other management methods. However, for structured electronic invoicing, digital certificates are used to guarantee that authenticity.

Yes, you can issue an invoice without VAT but only in specific cases: exempt operations (for example, certain healthcare or educational services), exports, or intra-community services with reverse charge, among others. In these cases, it's usually advisable to state the reason (e.g., “VAT-exempt operation” or a legal reference) to avoid confusion.

It usually applies when you invoice professional services to companies or freelancers (not to individuals). The percentage depends on the case (for example, the standard rate or the reduced rate for new freelancers in certain situations). If you're not sure, it's best to check with your advisor, since this is one of the most commonly misconfigured settings.

Yes. The key is to identify whether the client is a company or an individual and whether they're in the EU or outside the EU, since this changes the VAT treatment (Spanish VAT, exempt, reverse charge, etc.). A generator can help you with templates, but the tax rule depends on the case.

We define a reverse charge invoice as one where the issuer doesn't charge VAT; instead, the recipient declares it (typical in intra-community B2B operations and in some sectors). In practice, the invoice is usually issued “without VAT” with a note indicating the reverse charge.

A full invoice includes all the client's tax details and the complete breakdown. A simplified invoice (similar to a receipt) is used for small amounts and certain shops/services, but it has limits and isn't always valid for deducting taxes if it doesn't include the recipient's details when required.

Yes. In that case, the client's NIF/CIF isn't usually “mandatory,” but it's a good idea to include their name and address if the client requests it or if it's advisable given the type of operation. VAT (if applicable) still applies the same way.

The correct approach is to issue a corrective invoice (not “delete” or renumber it). The corrective invoice adjusts amounts, VAT, client details, or line items, and must be clearly identified and linked to the original invoice.

You can invoice in another currency, but it's highly recommended to clearly show the total and, if applicable, the exchange rate or the euro equivalent when it's relevant for your taxes or bookkeeping.

It's not always mandatory, but it's highly recommended: method (transfer, card, cash), due date (deadline), IBAN, and reference. It helps avoid missed payments “out of forgetfulness” and reduces back-and-forth with the client.

The numbering must be sequential. If there's a gap, you should be able to justify it (for example, a properly documented cancelled invoice) or issue a corrective/cancellation invoice as appropriate. In your tool, this is solved by avoiding the deletion of issued invoices.