The Sedonis blog
Learn to start & run your own thing.
No-fluff guides for people building a business — money, tax, reselling, freelancing and privacy.
Start a business How to set up a limited company in the UK (step-by-step) A plain-English walkthrough of registering a limited company with Companies House — what you need, what it costs, and what to do the day after. → Money How to write an invoice (+ exactly what it must include) A simple guide to writing your first invoice in the UK — the details it legally needs, how to number it, and how to actually get paid on time. → Start a business Sole trader vs limited company: which should you choose? The honest trade-offs between being a sole trader and a limited company in the UK — tax, admin, liability and privacy — so you can pick with confidence. → Start a business How to register as self-employed with HMRC A step-by-step guide to registering as a sole trader with HMRC in the UK — when you need to, how to do it, and what happens next. → Reselling Stop using a reselling spreadsheet (here's what to track instead) Spreadsheets break the moment reselling gets real. Here's what you actually need to track — cost, fees, profit per item — and a faster way to do it. → Reselling Do you pay tax on Vinted and eBay sales? The UK rules, simply Selling on Vinted, eBay or Depop? Here's when it's tax-free, when it isn't, and what the platform-reporting rules actually mean for you. → Money How to calculate profit margin (with real examples) Gross margin, net margin and markup — what they mean, how to work them out, and why the difference matters for pricing your product or service. → Freelancing How to price freelance work (day rate vs value) How to set freelance rates that actually pay you properly — working out your day rate, when to price by value, and how to raise prices without losing clients. → Creators How much to charge for brand deals (a creator's guide) How to price sponsored posts and brand deals as a content creator — what actually drives your rate, a simple starting formula, and how to invoice sponsors properly. →