Taxes & Legal Basics for Side Hustles
The part every side hustle guide skips: what happens once the money actually starts showing up, whether you're in the US, the UK, or the EU.
In plain English
Nearly every method on this site pays through a platform that now reports seller activity directly to tax authorities once you cross a certain threshold — in the US and in the EU. That doesn't mean casual decluttering suddenly owes tax. It means the old assumption that "the platform won't tell anyone" no longer holds up anywhere, so it's worth knowing the basic rules before the money starts arriving.
This is not tax or legal advice
I'm not an accountant, a tax advisor, or a lawyer, and tax law varies enormously by country, and even by state or region within a country. Everything below is general orientation, not a substitute for advice from a qualified professional or your local tax authority. Where a number appears, it's sourced and dated — check the official source linked below for anything current, because thresholds and rules change.
The core principle, everywhere
Income is income, regardless of the platform it came through. Whether it's ad revenue, freelance client payments, or resale profit, most tax systems expect it to be declared once it crosses from "occasional personal activity" into something done regularly, with an intent to profit. The line between the two is exactly where most of the confusion sits — and it's drawn differently country to country.
Platform reporting: 1099-K in the US, DAC7 in the EU
As of 2025 and continuing into 2026, US payment platforms and marketplaces issue a Form 1099-K to sellers who cross $20,000 in payments and 200 transactions in a calendar year at the federal level — though some individual states set their own, much lower thresholds, in a few cases as low as $600, so check your specific state's rule. Not receiving a 1099-K doesn't mean the income isn't taxable; it just means the IRS wasn't sent a copy directly.
In the EU, the DAC7 directive requires platforms like Etsy, Vinted, and eBay to report a seller's data to tax authorities once they cross 30 transactions or €2,000 in payments in a calendar year, whichever comes first — and once either threshold is crossed, the platform reports the seller's full-year activity, not just the amount above the threshold. Genuine one-off sales of your own used personal items generally remain tax-free under DAC7 regardless of how many you sell; it's repeated, profit-motivated selling that typically becomes taxable. The first large wave of DAC7 data reached national tax authorities in 2024 and 2025, and many sellers are only now starting to receive follow-up letters as authorities work through it.
Do you need to register as self-employed?
In the US, earning self-employment income generally means reporting it on a Schedule C and potentially paying self-employment tax (Social Security and Medicare) on top of ordinary income tax, usually via quarterly estimated payments once the amount is meaningful. Occasional gig income still needs declaring even without a 1099 form.
In the UK, regular income from a side hustle typically needs declaring through Self Assessment once it's a genuine, ongoing activity rather than the occasional sale of unwanted items. Most EU countries have their own equivalent: an auto-entrepreneur or micro-entreprise registration in France, a Kleinunternehmer regime in Germany and Austria, and similar simplified small-business categories elsewhere — built specifically for people earning modest, part-time income from exactly this kind of work. None of these are unified across the EU, so the right one depends entirely on where you're resident.
VAT and sales tax
In the US, most states now require large marketplaces (Amazon, Etsy, eBay) to collect and remit sales tax automatically on your behalf under "marketplace facilitator" laws, so individual sellers usually don't need to handle this themselves for marketplace sales — though it can differ for sales through your own Shopify store. In the EU and UK, VAT registration is generally required once turnover crosses a national threshold, and cross-border sales within the EU are commonly handled through the One Stop Shop (OSS) scheme rather than registering separately in every country you sell into. Thresholds and rules here change fairly often, so this is one to check directly against current guidance rather than assume.
Simple habits that make this painless later
Keep a running note of what you earned and spent on the hustle — a basic spreadsheet is enough at small scale. Save receipts for anything you bought specifically to resell or to run the business (inventory, shipping supplies, ad spend, a portion of relevant subscriptions). Set aside a rough percentage of every payment the moment it lands, rather than figuring it out at year-end. None of this requires an accountant on day one, but it makes hiring one later, or filing yourself, dramatically less painful.
Questions people ask about this
Do I owe tax on money I make from Vinted, Etsy, or a marketplace?
It depends on whether you're genuinely clearing out personal belongings or running something closer to a business. Occasional sales of your own used items are treated as tax-free personal sales in most countries, including under the EU's DAC7 reporting rules. Regular, repeated selling for profit is generally treated as taxable income, regardless of which platform it happens on.
What is DAC7 and does it mean I'll be taxed automatically?
DAC7 is an EU rule requiring platforms such as Etsy, Vinted, and eBay to report seller data to tax authorities once a seller crosses 30 transactions or €2,000 in payments in a calendar year, whichever comes first. It's a reporting requirement, not a new tax — it doesn't automatically mean you owe tax, but it does mean tax authorities now receive that data directly rather than relying on you to declare it.
Do I need to register as self-employed to sell online?
If it's occasional and not run for profit, usually not. If you're sourcing inventory to resell, freelancing regularly, or running a shop as an ongoing activity, most countries expect some form of registration. Rules vary significantly by country, so check your local tax authority's guidance directly.
Sources & further reading
This guide is fact-checked against the official sources below, current as of the last-verified date above. Tax rules change, sometimes yearly — always confirm current thresholds and requirements on the official page for your country before acting.
- Gig Economy Tax Center — IRSOfficial US guidance on reporting income from gig work and online selling.
- About Form 1099-K — IRSCurrent federal reporting thresholds for payment platforms.
- DAC7 Administrative Cooperation — European CommissionOfficial EU explanation of the DAC7 digital platform reporting directive.
- Set Up as a Sole Trader — GOV.UKOfficial UK guidance on registering for Self Assessment and self-employment.
Jargon used on this page
- 1099-K
- A US tax form payment platforms issue to sellers who cross a federal reporting threshold, showing total payments processed through that platform in a year.
- DAC7
- An EU directive requiring digital platforms to collect and report seller data to tax authorities once a seller crosses set transaction or payment thresholds.
- Marketplace facilitator law
- US state laws requiring large marketplaces to collect and remit sales tax on behalf of sellers automatically.
- One Stop Shop (OSS)
- An EU VAT scheme letting businesses report and pay VAT on cross-border EU sales through a single return, rather than registering in every country.
- Self Assessment
- The UK's system for individuals to report income (including self-employment income) that isn't automatically taxed through payroll.
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