The Side Hustle Series: E-Commerce, Our Handy Guide to the What and How

Most people who start an e-commerce side hustle don't begin with a grand business plan. They start with something they already make, something they're good at, or something they noticed people kept asking them about. Then they put it online and see what happens.

That's a perfectly reasonable way to start. But there are things worth knowing before you do, about where to sell, how to get found, and what happens legally once the money starts coming in. This guide covers all of it.

Key Takeaways

• E-commerce means selling online. That covers everything from handmade candles on Etsy to digital templates on Creative Market to preloved clothes on Vinted.
• You don't have to make the product yourself. Dropshipping, reselling, and digital products are all viable options with low startup costs.
• Choosing the right marketplace matters more than most people realise. The platform that works for handmade jewellery is completely different from the one that works for design assets.
• Marketing doesn't have to be complicated, but it does have to happen. Picking one channel and doing it consistently beats trying to be everywhere at once.
• Once your income from e-commerce goes above £1,000 in a tax year, you're legally required to register with HMRC.
• Good admin habits from the start make everything easier later, including tax time, understanding your actual profit, and scaling up.

What Is E-Commerce?

E-commerce is buying and selling online. That's it. The term covers everything from global retailers down to someone selling handmade earrings from their kitchen table.

The first recorded secure online transaction happened in 1994 when a Sting CD was sold through a site called NetMarket using encrypted payment technology. Things have moved on a bit since then. Today, anyone with a product and an internet connection can sell to people anywhere in the world, often without needing a website of their own.

Step 1: Decide What You're Going to Sell

Start with what you already have, a skill, a hobby, or access to something other people want. That's usually the fastest route to selling something people actually buy.

Baby products, digital templates, plants, candles, art prints, vintage clothing, handmade jewellery: all of these have active, established markets online. The question isn't whether there's demand for something. The question is whether you can offer a version of it that's worth buying.

You don't have to make anything either. Dropshipping means you sell a supplier's product without ever touching the stock. Reselling preloved or vintage items is another low-cost starting point. Digital products like templates, guides, or artwork can be sold repeatedly with no inventory required, which is part of why they're so popular.

Step 2: Look at What's Already Working

Before you set anything up, spend time on whatever platform you're considering and look at what's selling well. This tells you more than any market research report.

If you want to sell Canva templates, go to Creative Market and look at the bestsellers. What are they charging? How are they describing their products? What do their product images look like? Do the same on Etsy if you're thinking about handmade goods, or Depop if preloved clothing is your thing.

Many experienced sellers share what works on YouTube or Instagram. It's worth an hour of your time before you spend any money.

Step 3: Choose Where to Sell

Where you sell shapes everything else, including your potential audience, your fees, and how much control you have over your brand and pricing. Getting this right early saves you having to switch platforms later.

Here's a quick breakdown of the main options:

• Etsy – Handmade, vintage, and craft items. Strong community, loyal buyers, good for niche products.
• Depop / Vinted – Preloved and vintage clothing. Active communities of fashion-conscious buyers.
• ASOS Marketplace – Independent fashion brands and vintage sellers targeting a younger audience.
• Creative Market – Digital design assets, templates, fonts, photos.
• Shopify – Build your own standalone store. More control, more setup.
• Amazon / eBay – High volume, competitive pricing, broad audience. Better suited to resellers with healthy margins.

Starting with one platform is the right call. Trying to manage three at once when you're just getting going is a fast route to burning out before you've really started.

Step 4: Get the Word Out

Getting your first few sales is the hardest part. Once you have some reviews and a bit of momentum, things get easier. But at the start, you have to actively push.

Pick one social media channel that makes sense for what you're selling and commit to it. Instagram and TikTok work well for anything visual. Pinterest is strong for home, craft, and lifestyle products. If you're selling B2B digital services, LinkedIn is worth your time.

Don't underestimate your personal network either. Telling friends, family, and colleagues that you've started something is free, often generates your first sales, and feels uncomfortable in a way that usually means it's worth doing.

Scheduling tools like Buffer or Later let you plan posts in advance so you're not scrambling to post something every day. Consistency matters more than volume.

Step 5: Keep On Top of the Day-to-Day

Once you're trading, the business needs managing. Orders, customer messages, inventory if you hold stock, and your finances all need attention on a regular basis.

How much work this involves depends on what you're selling. Digital products are largely passive once set up. Physical products mean more active management of stock and fulfilment.

From a compliance standpoint, if you're making money you need to report it to HMRC. Most people start as sole traders, which means registering for Self Assessment and filing a tax return each year. It's not complicated, but it does need doing.

If your income grows to a point where the tax treatment of a sole trader starts working against you, forming a limited company is worth looking into. Our guide on sole trader vs limited company explains the key differences clearly.

What You Need to Know Legally

Registering With HMRC

The trading allowance is a £1,000 tax exemption. If your gross e-commerce income stays below that in a tax year, you don't need to register with HMRC or file a return.

Once you go above £1,000, you're required to register as a sole trader and file a Self Assessment tax return. One thing worth knowing: the threshold applies to your gross income, not your profit. So if you earn £1,100 but spend £400 on materials, you've still crossed the threshold and need to register, even though your profit is only £700.

If your income goes over £1,000, you must register with HMRC by 5th October following the end of that tax year. Miss that deadline and you risk a penalty, so it's worth keeping track of your income as you go rather than working it out at the end of the year.

One change coming further down the line: HMRC confirmed in March 2025 it will increase the reporting threshold for trading income to £3,000, starting in the 2027/28 tax year. The £1,000 trading allowance itself isn't changing, but from 2027/28 those earning between £1,000 and £3,000 will use a simplified reporting system rather than a full Self Assessment return. Worth keeping an eye on as the rules bed in.

If you're selling alongside other self-employment or property income and your combined gross income is above £50,000, Making Tax Digital rules apply from April 2026. This means keeping digital records and submitting quarterly updates to HMRC rather than a single annual return. Check the current GOV.UK guidance if this might apply to you.

Forming a Limited Company

As your income grows, the question of whether to form a limited company tends to come up. There can be tax advantages depending on your circumstances, and it creates a formal separation between your personal and business finances.

Directors of limited companies have additional obligations, including filing annual accounts and a confirmation statement with Companies House each year. It's worth speaking to an accountant before making the switch rather than doing it because it feels like the right time.

Keeping Your Records Straight

Track all income and expenses from the start. It's much easier to build the habit early than to reconstruct six months of transactions when you're trying to file a return.

Accounting software like Xero makes this significantly less painful, and business bank accounts like Revolut integrate with bookkeeping tools to reduce the admin burden further.

FAQs

Do I need to officially register my e-commerce side hustle?

Once you earn more than £1,000 from it in a tax year, yes. That's the point where HMRC expects you to register as a sole trader and file a Self Assessment return each year. It's not as daunting as it sounds, and GOV.UK walks you through the registration process step by step.

Which platform should I start selling on?

Honestly, it depends on what you're selling. Etsy is the obvious starting point for handmade or vintage products. Depop and Vinted are where the preloved clothing crowd hangs out. If you're selling digital design work, Creative Market is worth a look. And if you want your own store rather than selling through someone else's platform, Shopify gives you that control, though it takes more setup to get going.

Is dropshipping actually worth it as a side hustle?

It can be, but go in with realistic expectations. You're selling someone else's product without holding stock, which keeps startup costs low. The downside is that margins tend to be tight and you're relying on a supplier to fulfil orders on time and to a decent standard. If something goes wrong with a delivery, the customer comes to you, not them. Pick your suppliers carefully and don't assume it's passive income from day one.

When does it make sense to form a limited company?

Most people start as sole traders and stay that way for a while, which is completely fine. The limited company conversation usually comes up when profits get to a level where the different tax treatment starts making a meaningful difference. There's no magic number that triggers it though. An accountant who knows your full financial picture will give you a much more useful answer than any general guide can.

This article is for general information only and does not constitute legal, tax, or financial advice. Tax rules, registration requirements, and HMRC thresholds can change. Always check current guidance on GOV.UK and speak to a qualified accountant before making decisions about how to structure or report your business income.