Side Hustle Tax Guide UK: PAYE, trading allowance, expenses and Self Assessment
A side hustle can start small: a few freelance invoices, a Vinted resale experiment, TikTok Shop commissions, paid content work, tutoring, digital downloads or weekend services. The tax position becomes easier to manage when you understand five things: gross income, allowable expenses, the £1,000 trading allowance, how PAYE income affects your tax rate and when Self Assessment may be needed.
The core rule
Side hustle tax starts with gross income, not just profit
The biggest mistake side hustlers make is looking only at what is left after costs. For the trading allowance, the key figure is gross trading income before expenses. That means sales, fees, commissions, tips, sponsorship payments or customer payments before platform deductions, postage, packaging, software, stock or other costs.
If your gross trading income is £1,000 or less in a tax year, you may not need to report it in many straightforward cases. If it is above £1,000, you may need to tell HMRC and work out whether to use actual allowable expenses or the trading allowance. The allowance is not a simple extra £1,000 of tax-free profit on top of expenses. In most cases, you choose one method for the same income.
This matters for low-margin side hustles. A reseller might take £1,500 through a marketplace but spend £1,100 on stock, postage and fees. The profit may feel small, yet gross trading income is still above £1,000. A creator might receive several small payments from different platforms that only become significant when added together. Good records make the decision much calmer.
Common situations
Which side hustle tax path fits your income?
Side hustle tax is easier when you match the income type to the right records and calculator. A freelance service business, a resale activity and a creator account can all be taxable, but the expenses and evidence may look different.
PAYE job plus weekend freelancing
Design work, tutoring, consulting, delivery work or odd jobs
Track gross income and costs separately from wages, then use the Side Hustle Tax Calculator or Sole Trader Tax Calculator.
Online selling and reselling
Vinted, eBay, Depop, Whatnot, Facebook Marketplace or live selling
Separate personal clear-outs from stock bought to resell, then estimate profit with the Reseller Tax Calculator.
Creator income
TikTok, YouTube, OnlyFans, Twitch, sponsorships, tips or affiliates
Record each income stream and platform fees, then use the Creator Income Tax Calculator for a planning estimate.
Digital products or Etsy income
Printables, templates, craft products, digital downloads or courses
Track gross platform sales, fees, refunds and software costs, then compare actual expenses with the trading allowance.
PAYE and side income
Your salary can affect how side hustle profit is taxed
PAYE often makes employment tax feel handled automatically. Your employer deducts tax and National Insurance from salary before paying you. A side hustle is different because the income often arrives without tax deducted. If it needs reporting, the profit is usually considered alongside your other taxable income.
That is why two people with the same side hustle profit can have different tax outcomes. Someone with no other income may have unused Personal Allowance. Someone with a full-time salary may already have used it. Someone near a higher-rate band may see part of the extra profit taxed at a higher marginal rate.
Student loan repayments can also be affected by total income. Calculator estimates are useful here because they show the wider picture, but they are not a substitute for the final HMRC calculation.
Records to gather before estimating
- Gross side hustle income before fees or deductions.
- Platform statements, invoices, bank records and cash records.
- Allowable expenses with receipts or clear notes.
- PAYE salary, tax already deducted and student loan details.
Calculators
Estimate the next step
Side Hustle Tax Calculator
Best starting point when you have PAYE salary plus extra income from freelancing, selling, creator work or platform payments.
Sole Trader Tax Calculator
Use this when the side hustle is self-employed work and you want to estimate tax on profit after allowable expenses.
Reseller Tax Calculator
For Vinted, eBay, Depop, Whatnot and marketplace sellers tracking stock, postage, packaging and platform fees.
Creator Income Tax Calculator
For YouTube, TikTok, OnlyFans, Twitch, Patreon, sponsorships, affiliate income, subscriptions and tips.
Self Assessment Payment Calculator
Use after estimating profit to understand what might be due after filing a Self Assessment tax return.
Payments on Account Calculator
Use if a January bill may include advance payments towards the following tax year.
Planning habit
Do not wait until January to find the numbers
The most useful side hustle tax habit is monthly record keeping. Download platform reports while they are easy to access. Save invoices, receipts and screenshots. Keep a note of cash payments. If a purchase is partly personal and partly business, record the business-use percentage and why it is reasonable.
If the side hustle grows, payment timing becomes important. A first Self Assessment bill can include the tax for the year just filed plus a first payment on account towards the current tax year. That is not an extra tax, but it can still feel like a shock if you have not set money aside.
A simple approach is to estimate profit every month or quarter, transfer a percentage into a separate tax savings account and revisit the estimate whenever income changes. If the figures are large, the income is irregular or you are unsure what to claim, professional advice can prevent expensive guesses.
Side hustle tax FAQs
Do I pay tax on a side hustle in the UK?
You may need to pay tax if the side hustle is trading activity and the income needs to be reported. The first practical check is usually gross trading income for the tax year, because the £1,000 trading allowance is based on income before expenses.
Is the £1,000 side hustle allowance based on profit?
No. The trading allowance is based on gross trading income before expenses. A side hustle with £1,200 of sales and £900 of costs can still be above the £1,000 gross income level.
Does PAYE tax from my job cover side hustle income?
Usually no. PAYE normally deals with employment income from your job. Separate trading or self-employed profit may need to be reported through Self Assessment and may be added to your salary when working out tax.
Should I use the trading allowance or actual expenses?
It depends on your real costs. The trading allowance may be simpler for low-cost activity. Actual expenses may be better where you have meaningful costs such as stock, software, postage, packaging, platform fees, equipment or advertising.
Do I need to register as self-employed for a small side hustle?
You may need to register for Self Assessment if your income needs to be reported. Keep records from the beginning even if you are unsure, because it is easier to check the position later when the figures are organised.
Which calculator should I use first?
If you have PAYE salary and extra income, start with the Side Hustle Tax Calculator. If the income is clearly self-employed work, use the Sole Trader Tax Calculator. For online selling or creator income, use the reseller or creator calculator first.