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Whether it’s selling vintage shoes or taking on tutoring clients, so-called side hustles have exploded in recent years. In fact, last year, Sage research found that almost half of Brits now have a second income stream.

But, as more people enter the online entrepreneurial pipeline, it’s important to have a clear picture of compliance to keep the taxman from knocking. This week at The Salary Calculator, we’ll explain:

• What’s driving the rise in people selling goods & services online?
• What’s the difference between a side hustle and reselling?
• What are HMRC’s new digital platform reporting requirements?
• What’s happening to the Income Tax Self Assessment (ITSA) reporting threshold?
• Will the allowance threshold increase?
• How will Making Tax Digital affect side hustles?
• Tips and tools to help you stay compliant

What’s driving the rise in side hustles?

Side hustles bounced into the spotlight during the COVID-19 pandemic as the world shifted online and companies cut back on jobs and furloughed staff. And amidst an ongoing cost of living crisis, employment insecurity and a looming recession, the side hustle trend has continued as workers eye new avenues to supplement their income — with varying degrees of success.

According to a 2024 Adobe Express poll of 1,500 Brits, 73% make up to £500 each month from their side hustle, while 20% make over £1,000.

But money isn’t the only driving force behind this rising trend. The research found that 22% of those seeking side hustles are doing so in pursuit of greater flexibility in their work schedule.

The growth of the second-hand market has buoyed growth, too. Nearly 30 million UK adults shopped online for pre-loved items in 2024. Accommodating this demand, 23.8 million Brits turned to online second-hand selling platforms last year, earning an average of £146 a month.

“There’s been a big increase in the secondary selling of technology”

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The second-hand tech market, in particular, is booming.

“What we’ve seen is that — certainly around smart tech — there’s been a big increase in the secondary selling of technology,” said Scott Butler, executive director of the non-profit group Material Focus. Butler explained that consumer attitudes are changing, with more emphasis placed on affordability over upgrades.

Indeed, in 2023, technology retailer Currys found that one in three Brits were likely to buy second-hand tech, with pre-used electronics exceeding pre-loved clothes in popularity.

But alongside a growing appetite for affordable goods, environmental concerns are also a key driver of this trend. Currys’ research found that 75% of those polled were worried about e-waste — one of the fastest-growing waste streams in the world.

And with the average household hiding around 30 unused electrical items in so-called “drawers of doom,” there’s plenty of money to be made. In fact, Material Focus found that households could cash in between £1,304 and £6,331 by selling unwanted items through reselling platforms.

What’s the difference between a side hustle and reselling?

But with more Brits looking to make a little cash on the side and pursue their passions, it’s important to understand how this work is categorised in the eyes of HMRC — because there are potential tax implications.

And with misleading “side hustle tax” headlines floating around, there’s been a fair amount of confusion.

Luckily, HMRC has released guidance to clarify who needs to pay what and how.

It all boils down to whether or not you’re trading. If you’ve got an old pair of shoes that never quite fit kicking about in the back of your wardrobe and you’re looking to shift them, this isn’t trading. So, you don’t need to register for self-assessment or pay tax (unless an item exceeds £6,000, in which case you’ll need to pay capital gains tax.)

However, regularly making necklaces to sell online, buying vintage items to resell for a higher price, or upcycling items for resale would be considered trading. This also applies to dog-walking, content creation, gardening and similar activities.

If you earn £1,000 or less from these activities, you won’t need to declare or pay tax, but if you exceed this amount, you’ll have to set up as a sole trader and pay tax via Self-Assessment. 

What are HMRC’s new digital platform reporting requirements?

So, what was all the “side hustle tax” hullabaloo, I hear you ask? Well, the confusion came from HMRC’s announcement that from January 2025, online platforms like eBay, Vinted, and Airbnb would have to share data on platform sellers, including income data.

As the Low Incomes Tax Reform Group outlined, this means that if online sellers have failed to pay what they owe, HMRC is “more likely to find out about it,” and platforms may ask more questions when users sign up to ensure that they’re HMRC-aligned.

However, it’s worth noting that if you make fewer than 30 sales of goods in a year and receive less than 2,000 euros (roughly £1,700), a platform won’t report your details.

If a platform fails to follow the new rules, however, there are various financial penalties.

What’s happening to the Income Tax Self Assessment (ITSA) reporting threshold?

One change that will eventually affect sellers more directly is the recently announced plan to increase the Income Tax Self Assessment (ITSA) reporting threshold.

Under the new plans — set to come into effect within this parliament — the Income Tax Self Assessment (ITSA) reporting threshold for trading income will increase from £1,000 to £3,000.

According to HMRC, this will benefit “around 300,000 taxpayers,” with an estimated 90,000 no longer needing to pay tax with no reason to report their trading income to HMRC. Those who do will pay their tax through a new online service — although further details about this service are yet to be announced.

Helen Christopher, chartered accountant and founder of Beansprout, said for many, this is good news, reducing the compliance burden and saving both time and money for those running very small businesses or hobbyist activities.

“From an HMRC perspective, this change frees up resources to focus on larger or higher-risk cases and aligns with their longer-term ambition to simplify tax reporting and roll out more digital services under Making Tax Digital,” added Christopher.

Will the allowance threshold change? 

Although there have been some reports that the allowance threshold is increasing to £3,000, this isn’t the case. However, some argue that it should be.

One joint study from Simply Business and The Federation of Small Businesses recommended that the tax-free trading allowance be doubled to £2,000 and rebranded as the “Side Hustle Allowance” to encourage entrepreneurship in the UK.

More broadly, with the government’s renewed focus on the circular economy, some wonder whether tax policy could be used to encourage progress in this area.

Indeed, Butler highlighted the school of thought that questions whether second-hand goods should be taxed again after a series of taxes have already been paid by producers, retailers and consumers the first time around.

“If you look at it from an environmental perspective and a resource use perspective, that is a potential lever that you could use to promote a more circular economy through making it less burdensome,” commented Butler.

He added that there are also those who advocate for VAT exemptions for repair services to make them more affordable and encourage uptake. This kind of reduced taxation has already been implemented for repairs for different products across Sweden, Austria, and the Netherlands.

How will Making Tax Digital affect online sellers? 

Another incoming tax administration strategy set to affect online sellers and side hustlers is Making Tax Digital.

From April 2026, sole traders and landlords earning £50,000 will be required to keep digital records, use MTD-compatible software and submit quarterly summaries of their income and expenses to HMRC.

By April 2027, this will apply to those with qualifying income above £30,000, and from April 2028, those with £20,000 in qualifying income will enter the compliance bracket.

“The changes will inevitably feel daunting, overwhelming, and costly for many online sellers and small business owners”

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Christopher described the Making Tax Digital strategy as a “fundamental shift towards a real-time, digital-first tax system, designed to modernise the UK’s tax processes and increase transparency.”

The impact that these changes will have remains to be seen, but some have doubts about their effectiveness.

“Until MTD ITSA fully hits in 2026, I don’t think we can completely foresee how it’s going to go, but I struggle to see how forcing people onto software that struggle with technology makes anything simpler,” commented Beth Jackson, Owner of 2 Sisters Accounting, adding: “I do hope much like when RTI was initially introduced, any penalty schemes will be incredibly lenient while people get to grips with the system.”

Christopher shared a similar sentiment. “While the intention is to streamline processes and improve tax compliance, the changes will inevitably feel daunting, overwhelming, and costly for many online sellers and small business owners — especially those who manage their finances informally or who have only recently started side businesses.”

That said, Christopher added that it also serves as an opportunity to “take greater control of your business finances,” creating more clarity around income and expenses, better forecasting of tax bills throughout the year and fewer year-end surprises.

Tips and tools for keeping compliant 

As with any business, big, small, or just starting out, there are always moving parts, so it’s key to keep on top of things and establish good habits.

“Building strong financial habits now can make the difference between a hobby and a thriving, scalable business in the future,” Christopher explained.

This includes careful record-keeping of income and expenses, whether through accounting apps or spreadsheets.

“The key thing for all businesses is to make sure you are saving your tax as you earn the money to avoid spending HMRC’s money, especially if you’re VAT registered,” added Jackson. “As an online seller, using tools like Linkmybooks to connect with Xero or Freeagent to track your profit levels and make sure you have the appropriate tax saved can make the world of difference in remaining profitable!”

It’s also important to understand different tax terms, for example gross income vs net profit, as well as HMRC’s other rules and regulations.

“Always check your total financial position,” Christopher noted, adding that if you have employment income, pensions, rental income, dividends, or other sources, you may still need to complete a tax return, even if your side business earns under the reporting threshold.

And, when things feel confusing, professional advice can help clear things up.

“Tax rules can be complex, and everyone’s situation is different. Speaking to an accountant or adviser early can save money, reduce stress, and help you get it right from the start,” said Christopher.