The realistic side hustles in the UK are the unglamorous ones: selling things you own, pet care, tutoring, cleaning, odd jobs, freelance skills you already use at work, and letting out a room or parking space. They work because there is steady local demand and you can start with little or no money. What makes one worth doing is your real hourly rate after costs, tax and travel, and if that falls below the £12.71 adult minimum wage, a few paid shifts might be a better deal.
This guide lists 12 options with what they need to get started, then shows how to do the pay test and the tax rules you need to know for 2026/27. For more ideas sorted by the £1,000 trading allowance, see our side hustle ideas for 2026.
12 side hustles that work around a day job
| Side hustle | Start-up cost | What you need |
|---|---|---|
| Selling unwanted items | None | Photos, a marketplace account |
| Dog walking and pet sitting | Low | Insurance, references, local reviews |
| Tutoring | Low | Subject knowledge; a DBS check is often expected |
| Cleaning | Low | Supplies, insurance, reliable transport |
| Odd jobs and flat-pack assembly | Low to medium | Tools, public liability insurance |
| Freelance writing, design or admin | Low | A portfolio; check your employment contract |
| Proofreading and transcription | None | Accuracy and a quiet space |
| Babysitting | None | References; first aid helps |
| Event, bar or hospitality shifts | None | Evenings or weekends free |
| Exam invigilation or marking | None | Seasonal availability |
| Renting out a room | None | A spare furnished room; landlord or lender consent |
| Renting a driveway or parking space | None | A space near demand, such as a station or stadium |
Shifts through an agency or employer are paid through PAYE, so tax is handled for you and you are entitled to at least the minimum wage. Everything else in the list is usually self-employment or casual income, which you manage yourself.
The pay test: what you really earn per hour
Before committing, work out your true hourly rate:
- Income: what customers pay you in a typical week.
- Minus costs: platform fees, materials, insurance, fuel or fares, equipment.
- Minus tax: set aside 20% of profit if you are a basic-rate taxpayer above your allowances, plus Class 4 National Insurance at 6% if your total profits are over £12,570.
- Divide by all hours: including travel, messaging, quoting, invoicing and cleaning up, not just time on the job.
A worked example
Here is an illustrative dog-walking week. Use your own local prices.
| Item | Weekly figure |
|---|---|
| Income: 8 walks at £15 | £120 |
| Costs: insurance, fuel, treats and bags | -£20 |
| Tax set-aside (20% of £100 profit) | -£20 |
| Hours including travel and messages | 7 |
| Real hourly rate | About £11.40 |
That is below the £12.71 minimum wage, even though £15 an hour sounds good. Grouping walks, cutting travel or raising prices would fix it. If your profits stay under the £1,000 trading allowance, there is no tax to set aside, which improves the figure. The take-home pay calculator is useful for comparing with extra hours in your main job.
Tax rules for side income in 2026/27
The main rules to know:
- Trading allowance: the first £1,000 of gross income from self-employment or casual work in a tax year is tax-free, and you do not need to tell HMRC if that is all you earn. Above £1,000 you must register for Self Assessment by 5 October after the end of the tax year.
- Selling your own things: clearing out personal belongings is not normally trading. Buying items to resell at a profit, or making things to sell, usually is.
- Platform reporting: online marketplaces report sellers who make 30 or more sales, or more than about £1,700 (€2,000), in a year to HMRC. Being reported does not mean you owe tax, but HMRC may ask.
- Rent a Room: up to £7,500 a year from letting a furnished room in your own home is tax-free. See our Rent a Room guide.
- Making Tax Digital: from April 2026, sole traders and landlords with qualifying income over £50,000 must keep digital records and send quarterly updates; the threshold falls to £30,000 from April 2027. Most side hustles are well below this.
- Universal Credit: self-employed earnings count, and UC usually reduces by 55p for every £1 you earn above any work allowance. Report income in your monthly assessment.
Before you start: three checks
- Your employment contract. Some contracts restrict second jobs or work for competitors. Our guide to freelancing alongside a full-time job covers how to raise it.
- Insurance. Driving for work usually needs business use cover on your car insurance. Pet care, cleaning and odd jobs usually need public liability insurance.
- Your tenancy or mortgage. Renting out a room or parking space may need your landlord's or lender's permission.
Side hustles to be wary of
Be cautious with anything that asks you to pay upfront for a "starter kit", training or a place on a scheme, promises a set income for little work, or relies on recruiting others. Reselling and dropshipping can work, but stock and advertising costs often exceed profits at first. Matched betting has specific risks; see our guide to whether matched betting is worth it. If an offer sounds too good, check the company on the FCA register or with Citizens Advice before handing over money or personal details.
Make the extra money count
Side income is easiest to waste because it arrives irregularly. Open a separate account for it, move your tax set-aside first, then decide in advance where the rest goes: debt, an emergency fund or a specific goal. SYM can help you build a daily saving habit alongside it, and the savings goal calculator shows how quickly a regular extra £50 or £100 a week reaches your target.
Side hustles: frequently asked questions
How much can I earn from a side hustle before paying tax?
Do I need to tell HMRC about selling things on Vinted or eBay?
What is the easiest side hustle to start in the UK?
Will a side hustle affect my Universal Credit?
Can my employer stop me having a side hustle?
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