Who's buying decides whether there's an invoice
You'll know whether a payment needs a full invoice or just a simplified receipt, based on who's paying, and you'll ask for the tax details before getting paid, not after.
By Yodai · Published September 6, 2026 · Updated October 13, 2026
You just got paid for a job, and you're not sure whether you need to issue a full invoice or if a receipt will do. The question on your mind is how much you charged, but that's not what decides it first. What decides it first is who bought from you: according to the Invoicing Regulation, if the customer is a business or professional acting as such, you must issue an invoice, period. The amount only comes into play afterward, to figure out whether a simplified receipt is enough.
If a company or a freelancer is paying, they're going to book that expense. They need a document with your tax ID, theirs, and both parties' tax details, because the General Tax Law requires deductible expenses to be backed, first and foremost, by the invoice from whoever did the work, and the VAT Act only allows VAT to be deducted with an invoice that meets every requirement. Without that, the document won't help them deduct anything.
If it's an individual paying, they're not deducting anything. The document doesn't need their tax ID (yours always goes on it, on any invoice). All they need is proof of what they paid and how much, what the regulation calls a simplified invoice and what we call a simplified receipt here.
A full invoice and a simplified receipt aren't two names for the same thing. They're two different documents for two different needs, and it's the buyer's need that calls the shots, not yours.
Before you charge, ask who's buying
- 1Check who's paying
Before you issue anything, check whether the payment is coming from an individual or a business. If you charge online and your store lets you add a field, ask for their name there and, if they have one, a tax ID; if it doesn't let you, ask in the message where you confirm the order or appointment, before you send the charge. - 2If it's a business or a freelancer, ask for the tax ID before you charge
Not after. Ask for it in the same message where you confirm the appointment or the order. Without that information, you can't create the full invoice they're going to need. - 3If it's an individual, don't ask for more than you need
Asking for a tax ID from someone who's never going to use it adds an extra step to checkout, and extra steps cost you: the Baymard Institute found that 17% of US online shoppers have abandoned an order because checkout was too long or too complicated. A simplified receipt with what was bought and what was paid is enough for orders up to $400, tax included, and up to $3,000 for retail, restaurants, salons, and other sectors the regulation lists. - 4Set up the rule once, don't decide it every time
If half your customers are businesses, always ask "personal or for your business?" at the same point: in the booking or checkout step if your website lets you add it, and if not, in the message where you confirm.
- Includes your tax ID and the buyer's, plus the name or business name and billing address for both of you
- Needed by whoever is going to deduct the expense: businesses and freelancers
- Without it, your customer can't deduct that purchase or its VAT
- Includes what was bought, what was paid, and the date; it doesn't require the buyer's tax ID
- Works for an individual who just wants proof of purchase
- Issued on the spot, without asking for information the customer has no reason to give
Which one to pick: If a freelancer or a business is buying, the law requires you to issue an invoice, as the Tax Agency points out; for them to deduct the VAT, it needs their tax ID, their address, and the VAT broken out, which is what we call a full invoice. If an individual is buying, it's a simplified receipt by default as long as you stay under the cap, and you only switch to a full invoice if they ask for one and give you their details.
- You know the buyer is what decides it first; the amount only sets the cap for the simplified receipt.
- You have the rule: business or self-employed, full invoice with tax ID; individual, simplified receipt
- You know when to ask for the tax ID: before you charge, not after
- The next lesson covers the other side: the individual who pays and doesn't ask for anything
Sources
- Royal Decree 1619/2012, of November 30, approving the Regulation governing invoicing obligations, articles 2, 4, 6, 7, and 15. Spanish Official State Gazette (BOE), consolidated text, last updated March 31, 2026.
- VAT Invoicing. Types of Invoices. Tax Agency, accessed October 2026.
- Duty to Invoice (2025 Practical VAT Guide). Tax Agency, accessed October 2026.
- Law 37/1992, of December 28, on Value Added Tax, article 97. Official State Gazette (BOE), consolidated text, last updated October 7, 2026.
- Law 58/2003, of December 17, the General Tax Law, article 106.4. Official State Gazette (BOE), consolidated text, last updated December 21, 2024.
- 50 Cart Abandonment Rate Statistics 2026. Baymard Institute, updated September 22, 2025.