What a valid invoice in Spain must include

What a valid invoice must include

For an invoice to be valid in Spain, it must include the minimum details needed to identify the supplier and customer, what was sold or provided, and how the amount was calculated. The main rule is RD 1619/2012, which sets out basic invoicing requirements.

Missing an essential detail can cause accounting, tax or payment problems. So always check the invoice before sending it.

Identifying the supplier and customer

The invoice must clearly identify who issues and receives it. This means including details for both parties.

— Supplier’s and customer’s name or company name.
— Tax identification number (NIF) for both.
— Tax address or full address, where applicable.

For business-to-business transactions, these details are especially important: they link the invoice to the actual business activity and relevant tax return.

Invoice number, series and issue date

A valid invoice must have a unique number and follow a consecutive series. It’s not enough to add any number: the sequence must make it possible to order invoices without unjustified gaps.

The issue date must also appear. In some cases, the transaction date may also matter if it differs from the issue date.

— The number must be unique.
— The series must be consistent and traceable.
— Don’t reuse numbers or mix series without a clear reason.

Separate series are often used for different activities, workplaces or invoice types, provided they follow a clear, consistent logic.

Description, taxable amount and taxes

The invoice must clearly explain what was charged for. A vague description isn’t enough: it must identify the goods supplied or services provided.

It must also show a breakdown of the amounts:

— Taxable amount.
— VAT rate applied.
— VAT amount.

If the transaction is exempt or outside the scope of VAT, say so clearly to avoid queries or returns. The invoice must make clear why VAT is or isn’t charged.

Withholding tax and other details, where applicable

Some transactions require withholding tax as well as VAT. This applies, for example, to certain professional services subject to withholding.

Where applicable, the invoice must show:

— The amount withheld.
— The rate applied, if shown in the breakdown.
— The amount due after withholding.

If withholding is required but omitted, the invoice may be incorrect for your customer and your own accounts.

Corrective invoices and errors that can invalidate one

If an invoice has a significant error, you usually can’t simply “fix” it: you generally need to issue a corrective invoice. This is especially important if the number, amount, VAT, party details or transaction description is wrong.

Common reasons an invoice may be returned or challenged include:

— Missing NIF or incorrect supplier or customer details.
— Duplicate number or inconsistent series.
— Vague or unidentifiable description.
— Incorrect taxable amount, VAT or withholding calculation.
— Missing date or essential transaction details.

If the error affects an essential detail, it’s…

Final check before sending the invoice

Before issuing it, check that tax details are complete, numbering is correct, the description is clear, taxes are itemised and, where applicable, withholding and corrections are properly shown. This helps prevent rejections, late payments and future problems.

To reduce day-to-day invoicing errors, use a template you can review and follow an organised issuing process. If you need more control, Regifactu can help as part of your daily routine.