Affiliate income, the legal way: running it as an EU one-person business (2026)

You are already earning. A network pays you a few hundred euros, then a few thousand; the ad accounts spend and return; the niche site ticks over while you sleep. And then the quiet question that nobody in the affiliate forums answers properly: how do I actually hold this money legally in Europe — without a frozen account, a surprise tax letter, or the worst advice on the internet (“just take it in crypto and don’t declare it”)?

This is the white path: how an affiliate, media buyer or niche-site owner runs commission and ad income as a legitimate one-person business in the EU. It is the unglamorous half of the game — tax, VAT, banking, structure — but it is also the half that lets you deduct your ad spend, keep your money, and eventually sell what you built. (Everything here applies just as well to ad-network, sponsorship and other online-commission income; affiliate is just the sharpest example.)

1. First truth: affiliate income is business income, not a hobby

The most common — and most expensive — beginner mistake is treating commission income as some tax-free side thing. Under EU rules, anyone carrying on a continuous economic activity is a taxable person; the test is intent and regularity, not profit. Promoting offers for remuneration is economic activity. So from the point it becomes regular, your affiliate income is business income, and in most countries you must register before you invoice — as a sole trader, a micro-regime, or a company.

Germany, specifically (a real and well-defined trap): an ad- or affiliate-financed site is almost always a Gewerbe (commercial trade), not a Freiberufler (liberal profession). That matters because of the “infection theory” (Abfärbetheorie) — mixing commercial affiliate income into a freelance practice can reclassify all your income as commercial and pull it into trade tax. The clean move is to isolate affiliate income in its own registered Gewerbe. The mechanics are in self-employed in Germany.

Which regime you start in — and when you graduate to a company — is the sole trader vs OÜ vs freelance decision.

2. VAT on your commissions: the part everyone gets wrong

A commission is a B2B supply of a service. The general place-of-supply rule (VAT Directive Article 44) taxes a B2B service where the customer is established — i.e. where the network or advertiser is, not where you are. That single rule produces three outcomes:

Two things trip people up. First, being below your domestic VAT threshold does not always let you ignore VAT: receiving or supplying cross-border B2B services can still require you to hold an EU VAT number for reverse-charge reporting — verify locally, because the trigger differs by country. Second, ignore the guides that file affiliate commissions under “OSS/MOSS”: that regime is mainly for B2C digital sales to consumers. Your B2B commissions run on the Article 44 general rule and reverse charge; OSS is the edge case (e.g. a commission from a non-VAT-registered counterpart). If you also sell digital products to consumers, that is where EU VAT & OSS comes in.

The practical takeaway: you need invoicing/accounting software that handles reverse charge cleanly, because doing this by hand across a dozen networks is how quarter-end becomes a nightmare.

3. Your ad spend is deductible — which is why registering pays for itself

Run as a declared business, your ad spend (Google, Meta, native), tools, hosting and outsourced work are deductible costs — you are taxed on profit, not gross revenue. Undeclared income forfeits that: you would effectively pay full whack on the top line.

A detail worth getting right: Google and Meta bill EU advertisers from Ireland and do not charge you local VAT — the VAT-registered buyer self-accounts under the reverse charge (same Article 196 mechanism). For a fully VAT-registered, fully-taxable business it nets to zero on the return, but you must be registered and report it correctly. (For a partially exempt or unregistered buyer it can become a real cost — verify locally.)

4. Banking reality: which accounts freeze affiliate money — and how to avoid it

This is the fear that sends people to crypto, and it is half-justified. Modern EMIs onboard fast, then enforce an acceptable-use policy later. Wise’s policy, for example, explicitly prohibits gambling, adult content, crypto trading and “multi-level marketing… referral” (source). Plain affiliate marketing isn’t banned — but a model that looks like referral/MLM, or that runs gambling/adult/crypto offers, can be swept into a prohibited bucket. Card processors like PayPal and Stripe are notorious for onboarding without underwriting and then holding funds for ~180 days when a vertical lands on a prohibited list.

What actually keeps your money safe:

• A dedicated business account, never a personal one (and never co-mingled with the household). See the best business bank accounts for EU freelancers.
• Clean invoices to every network and signed network contracts — provable source of funds that survives an AML/KYC review.
• Match the account to your vertical. Mainstream EMIs are fine for ordinary affiliate income; genuinely high-risk niches (iGaming, adult) need a specialist provider, not a consumer fintech that will close you the week a big payout lands.

Notice the through-line: an undeclared, crypto-cashed income can never pass a source-of-funds check. The grey path locks you out of good banking; the white path is what unlocks it.

5. Structure: sole trader now, a company when the numbers say so

Most people start as a sole trader / micro-regime (micro-entreprise in France, autónomo in Spain, an isolated Gewerbe in Germany) and incorporate later. For a reinvesting media buyer, the standout option is an Estonian OÜ: a one-person company, fully online, and — critically — Estonia taxes 0% on retained/reinvested profit and only taxes distributed profit (22% of the gross distribution in 2025; the rate moves, so verify the current figure). That lets you compound ad spend pre-tax inside the company. The full case is in Estonian e-Residency, is it worth it? and, for the US-company question, US LLC vs your home setup.

The honest caveat that most “go offshore” content hides: e-Residency is not tax residency. Estonia’s own guidance says so plainly — your Estonian company is an Estonian tax resident, but another country can tax it if it is effectively managed from there, or your activity can create a permanent establishment where you actually live and work (source). An OÜ is convenient remote incorporation, not a way to stop paying tax where you sit. Anyone selling you “tax-free Estonia” is selling you an audit.

There is no magic revenue number where incorporating “makes sense” — it depends on your profit, how much you reinvest, and how your home country taxes dividends. That is exactly the conversation to have with an accountant. Setting up and running the company itself — formation plus the bookkeeping — is what services like Xolo exist for:

(Compare options first in company formation for EU solopreneurs.)

6. Why the white path beats a crypto cash-out (the part that actually matters)

This is not a morality lecture — it is a business case:

• The grey path is closing. From 2026 the EU’s DAC8 / CARF framework has crypto platforms collecting tax-residence data, with automatic reporting to tax authorities from 2027 (European Commission, DAC8). Undeclared crypto income is becoming more visible, not less.
• You keep more. Declared = you deduct ad spend and costs (Section 3). Undeclared = you forfeit every deduction.
• You can sell what you built. Brokers like Empire Flippers verify revenue against bank statements, processor records and 6–12 months of P&L — listings that fail verification are rejected. Un-invoiced, undeclared income makes the asset unsellable, or slashes its valuation. The clean books are the exit.
• You can take the good deals. Sponsorships and brand partnerships need a valid invoice from a real entity. No business, no deal.

7. The setup that actually works

Pulling it together — the legitimate practices that hold up:

1. Register in the right regime from the start (and in Germany, isolate the Gewerbe).
2. One dedicated business account, matched to your vertical, never co-mingled.
3. Invoice every network, handle reverse charge correctly, keep contracts and records.
4. Set aside a fixed % of every payout for tax from day one — pick the percentage with your accountant, because EU rates vary; the discipline is what matters.
5. Use accounting software that does VAT/reverse charge, and an accountant who understands affiliate income — the structure and quarterly-prepayment questions are where solos lose the most.
6. Incorporate when the profit and reinvestment justify it, not before — and never on a “tax-free” promise.

Get the boring layer right once and it stops being a threat: your money is bankable, your ad spend works for you, and the thing you built becomes an asset you own — and can one day sell. That is the difference between making money online and running a one-person business.

The next stop is the money layer itself — the best business accounts for EU freelancers and invoicing that handles EU VAT — and, if you sell digital products alongside the affiliate income, how you actually get paid.