Free tools for Spanish taxes and accounting
Calculators and checkers for anyone invoicing or keeping books in Spain: freelancers (autónomos), companies, expats and the advisers who work with them. The rules are Spanish, explained in English, with the official Spanish terms in brackets. No sign-up, most tools run entirely in your browser, and each one links to the official source of its figures (BOE, AEAT, Social Security or the European Commission).
Invoices and VAT (IVA)
Spain VAT and IRPF calculator
Net to gross and back at 21, 10 or 4 %, with equivalence surcharge (recargo de equivalencia) and income tax withholding.
Invoice generator for Spain
Fill in or describe the invoice and download a PDF with Spanish VAT and IRPF worked out.
Proforma invoice
What a proforma (factura proforma) is in Spain, when to use it, and a free PDF generator.
Quarterly VAT calculator
Estimate the result of your quarterly VAT return (modelo 303) from sales and expenses.
Check details
EU VAT number check (VIES)
Ask the European Commission database whether an intra-EU VAT number (NIF-IVA) is registered.
Spanish NIF, CIF and NIE validator
Checks the control letter or digit and the type of entity, one at a time or as a list.
IBAN validator
Check digits of any IBAN plus the Spanish account control digits (DC), without the data leaving your browser.
Taxes and contributions
Spain tax calendar 2026
Deadlines for modelos 303, 130, 111, 115, 200, 202 and more for your profile, exportable to your calendar.
Autónomo social security 2026
Your contribution bracket and monthly fee (cuota de autónomos) from your net income, with the official table.
VeriFactu test
Does VeriFactu apply to you and from when? Four questions and the official dates.
Accounting
Rather not do these sums by hand?
Aikount keeps your invoices, expenses and bank accounts and prepares the Spanish VAT returns from that data. It is free up to 24,000 EUR of yearly turnover. The app works in English and Spanish. See also our guide to accounting software for autónomos.