You publish your first book on Amazon KDP, the first royalties arrive... and the questions nobody warned you about appear: why is Amazon asking me about US tax forms? Will they withhold 30%? How do I declare this at home?
This guide answers those questions for non-US authors, in plain language and with exact steps. (Sections on local taxation use Spain as the worked example — the US-side steps apply to authors in any treaty country.)
Important notice: this article is general information for educational purposes, not tax advice. Rules change and every personal situation is different. For concrete decisions, consult a tax professional in your country — it's the best small investment you'll make in your publishing business.
The big picture: two tax fronts
Amazon is a US company paying you royalties, and you're a tax resident elsewhere. That activates two tax systems:
- United States: by default, the US withholds 30% of royalties paid to foreigners. BUT most countries have a tax treaty with the US that can reduce that withholding — often to 0% (Spain's treaty, for example, currently provides 0% on royalties) — if you claim it correctly via the W-8BEN.
- Your country: royalties are income you must declare at home, however they're categorized locally.
The good news: configured properly, you don't pay twice. The bad news: skip Amazon's tax interview and you lose up to 30% of every payment unnecessarily.
Step 1: the KDP tax interview (where the W-8BEN lives)
Amazon doesn't ask you to mail paperwork: the W-8BEN form is completed online inside your account (KDP → Your Account → Tax Information → "Complete Tax Interview"). The key steps:
- Taxpayer type: individual, unless you publish through a company.
- Are you a US person?: No.
- Country of tax residence: your country.
- Foreign TIN (tax identification number): your national tax ID goes here. This is the step most people get wrong — you do NOT need any US number (no ITIN, no SSN): your local tax ID is sufficient and valid.
- Treaty benefits claim: by indicating your country and your TIN, the interview applies your country's tax treaty with the US. For many European countries (Spain included) the treaty rate on royalties is 0%.
- Electronic signature and done. Amazon shows you the withholding rate applied at the end.
The correct outcome: 0% US withholding on your royalties (or your treaty's rate). If you see 30% in your payment reports, your tax interview is incomplete or wrong — redo it.
Annual paperwork: every year (around February–March) Amazon issues form 1042-S showing what was paid and withheld. Keep it — it's your proof.
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Step 2: declaring at home — the two lanes (Spain as example)
Here's the nuance that matters most: how royalties are taxed usually depends on whether you're an occasional author or running a habitual business.
Lane A: occasional author
If you've written and published a book (or a few) without it being an organized habitual activity, author royalties in Spain traditionally fit as employment-type income (rendimientos del trabajo) in the annual income tax return. No self-employment registration, no quarterly filings. This is the typical situation of someone publishing their first book while holding another job. Many countries have an equivalent "occasional income" treatment.
Lane B: economic activity (the "KDP business")
If you publish habitually and commercially — a growing catalog, a regular publishing rhythm, exactly what our publishing-business plan teaches — tax authorities will consider it a business activity. In Spain that generally means: census registration (form 036/037), evaluating self-employment registration (autónomos) — where habituality matters and professional advice is essential —, quarterly income-tax prepayments (form 130), and VAT nuances for the intra-EU royalties Amazon pays from its Luxembourg entity.
The transition from A to B is not a precise switch — it depends on habituality, volume, and organization. The honest practical reference: if you're building a catalog of dozens of books with recurring monthly income, you're in lane B or heading there; plan it with a professional BEFORE your tax office forms its own opinion.
The 5 costliest mistakes
| Mistake | Cost |
|---|---|
| Not completing the tax interview | An avoidable 30% US withholding on every payment |
| Assuming you need a US ITIN | Weeks of unnecessary paperwork — your local tax ID works |
| Not declaring royalties at home "because they come from abroad" | Penalties + interest; payment data is reportable and countries exchange information |
| Building a large catalog without assessing business registration | Retroactive regularizations |
| Losing the 1042-S | No proof of withholdings if anything was withheld |
FAQ
Do I need a US tax number (ITIN/EIN)?
As an individual, no. Your national tax ID serves as the foreign TIN on the W-8BEN.
How often does the W-8BEN renew?
It expires on December 31 of the third year after signing. Amazon notifies you to renew; if you change your country of residence, update it immediately.
Does Amazon send anything for my local tax return?
Nothing country-specific. Use your KDP payment reports and the 1042-S as supporting documentation.
If I sell on Amazon.es/.de/.co.uk — does the US part still apply?
The tax interview covers your global relationship with Amazon KDP. Always complete it regardless of which marketplaces you sell in.
How much should I set aside for taxes?
A conservative rule of thumb: reserve 20–25% of each royalty payment until a professional fine-tunes the percentage for your bracket and situation.
Conclusion: 30 minutes worth 30%
KDP taxes look intimidating, but they reduce to: (1) a properly completed tax interview → 0% (or treaty-rate) US withholding; (2) declaring your income at home; (3) formalizing with a professional when the catalog becomes a business. Half an hour of initial setup avoids the most expensive mistake (the 30% withholding) and lets you focus on what actually generates the income: publishing good books consistently.
For that last part — producing quality books at business pace without spending months on each — that's exactly what YourNovel.app is for: complete, coherent, KDP-ready books in hours. And you can run the business numbers in our KDP royalty calculator.