Guides

Guides

What e-commerce businesses ask me most, explained with the rules in front of us: VAT and cash, selling in other countries, company structure and margins. They cover Spanish tax rules. Each area has its guides and a real case from my own companies.

Cash and VAT

Profitable businesses that run short of cash because of how their VAT works: refunds that take a year, regimes they don't know about and records that don't add up.

How to join Spain's SII: who must use it and how to register What Spain's SII is, who must use it, how to opt in with form 036, invoice submission deadlines and how it relates to Verifactu. Read the guide REDEME: how to claim Spanish VAT refunds every month What Spain's REDEME is, who it suits, requirements, how to register with form 036, what it obliges you to do (monthly returns and SII) and refund timing. Read the guide
A real case: VAT that gets stuck →

Selling in other countries

What you need to have registered, and in what order, before selling to customers in other EU countries or sending stock to a warehouse outside Spain.

The EU One-Stop Shop (OSS): when it helps and when it doesn't How the OSS works for a Spanish e-commerce business: the €10,000 threshold, registration with form 035, the quarterly form 369 and what the OSS doesn't cover. Read the guide Amazon FBA in other countries (Pan-EU): which VAT registrations you need What happens to VAT when you send stock to Amazon warehouses in other EU countries: transfers of goods, local VAT numbers, form 349 and Intrastat. Read the guide
A real case: Selling in Italy and Germany →
Want to hand over day-to-day operations on Amazon, Shopify or other marketplaces? Qualiax handles it ↗

Company structure

Sole trader or company, when a holding company makes sense, how partners come in and how to set up the next business without disrupting the first.

When to set up a holding company (and when not yet) What a Spanish holding company is for, the 95% exemption under article 21, how it is created through a share exchange and when it isn't worth it yet. Read the guide From sole trader to limited company in Spain: when it pays off When an e-commerce business in Spain should move from autónomo to SL: income tax vs corporate tax in 2026, taking money out, costs and how to switch. Read the guide
A real case: When to set up the holding company →

Margins

The real margin of each product, by channel and by country, with everything deducted, and how far you can push advertising before you lose money.

How to calculate the real margin of a product on Amazon How to calculate the real margin of a product on Amazon: VAT, referral fee, FBA fulfilment, storage, landed cost, returns and advertising. Read the guide Break-even ACOS: how much you can spend on Amazon advertising What ACOS is, how to calculate break-even ACOS from the margin before advertising, how it differs from TACoS and how to set a spending ceiling per product. Read the guide
A real case: How much margin you can give up to grow →

Shall we look at your business?

This is the general rule. How it affects you depends on your structure, the countries you sell in and your margins, and that is what the diagnosis reviews. The first step is a three-question form.

The service is delivered in Spanish. The diagnosis, the written report and the sessions are in Spanish.

Request the diagnosis →

Tailored quote · Fixed before starting · Limited slots

Only need the paperwork done? GCT1, the tax practice I run in Elche, handles it (in Spanish).