Tax optimisation for an ecommerce business means paying the tax that is due, no more and no less, using every deduction and regime the law allows. It is not evasion: it is putting expenses, VAT and structure in order before the tax authority does it for you.
Informational guide reviewed in October 2026. Rules can change; check your specific case.
The three legal levers
- Deductible expenses: everything needed for the activity, with an invoice and properly booked.
- VAT: recovering input VAT and correctly reporting sales to EU consumers, either through the One-Stop Shop (OSS) or local registration.
- Structure: sole trader, company in Spain or foreign company, depending on profit, partners and where you live.
Mistakes that make your tax bill higher
- Bookkeeping done after the fact, with personal and business accounts mixed.
- Supplier invoices that are incomplete or lack the right tax details.
- Not registering for VAT in countries where you store with FBA.
- Choosing a company because it is trendy, without calculating what it costs to maintain.
What to always document
- Amazon payment reports and invoices, month by month.
- Supplier and shipping invoices.
- VAT returns filed in each country.
- Statements of the account where Amazon pays you.
How to start
First, put expenses and VAT in order. Then compare structures with real numbers: sole trader or company, US LLC or OÜ and how much an OÜ costs. If you would rather have a team review it, talk to Data Biz. You can also start with how to pay less tax selling on Amazon.