A common starting point is 25–30% of your net profit (after platform fees and material costs), covering both self-employment tax and income tax. Your exact rate depends on your total income, filing status, and location, so treat this as a starting buffer, not a final number.

In most countries, yes — income from a side hustle is generally taxable regardless of how small or occasional it is, and payment platforms may report your sales once you cross a reporting threshold. It’s worth tracking income and expenses from your very first sale rather than waiting until it feels “official.”

Platform fees (like Etsy’s listing or transaction fee, or Amazon’s referral fee) are charged by the marketplace for hosting and selling your product. Payment processing fees are separate charges for handling the card or digital payment itself. Most sellers find it simplest to combine both into one “total fee %” when estimating profit.

Generally, yes — the cost of materials, packaging, and shipping directly tied to producing and delivering what you sold typically reduces your taxable profit. Keep receipts and simple records throughout the year so nothing gets missed when it’s time to file.

Many self-employed sellers in the U.S. pay estimated taxes quarterly rather than waiting until the annual filing deadline, which helps avoid penalties and a painful lump-sum bill. Setting aside your tax buffer after every payout makes those quarterly payments far less stressful.