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If you are an employee who also makes money from a “side hustle” (like selling on eBay, Vinted, or freelancing), a major change is buried in the government’s latest financial plans.
Starting in 2029, HMRC plans to stop giving you a choice on how you pay your side-hustle tax. Instead of paying a lump sum after you file your return, HMRC will mandatorily adjust your tax code to take the money directly from your main job’s wages.
The big sting: In the first year this happens (2029/30), you could face a “double hit” of tax deductions—paying off the previous year’s tax bill plus an estimated payment for the current year at the same time.
What is changing?
To understand the change, we have to look at how things work right now versus what is coming.
The Current Rules (The “Nice” Way) Currently, if you earn extra money from a side hustle, you usually file a Self-Assessment tax return. If you owe tax (less than £3,000), you have a choice:
- Pay it in one go by the 31st January deadline.
- Opt to have it collected via PAYE: If you file early enough (by 30th December), you can ask HMRC to adjust your tax code. This spreads the payments out over the next tax year, interest-free. Crucially, this is currently your choice.
The New Rule (The Mandatory Way) From 2029, the government plans to remove this choice for many people. If you have a main job (PAYE income) and a side hustle, HMRC intends to automatically adjust your tax code to collect what you owe.
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Why is this a problem?
The main issue is cash flow.
When this system kicks in, HMRC isn’t just planning to collect the tax you already owe from the previous year. The proposal suggests they will also start collecting an estimate of the tax you will owe for the current year at the same time.
This creates a “double whack” in your monthly pay packet for the first year (2029):
- Deduction 1: Repaying the tax you owe from the previous year.
- Deduction 2: Pre-paying the tax for the current year (so you don’t fall behind again).
For someone earning a modest amount from a side business, seeing their monthly take-home pay from their main job drop significantly could be a nasty shock.
Is this the “eBay Tax“?
Not exactly. You might have heard about the “eBay Tax” (rules requiring platforms like Vinted and eBay to report seller income to HMRC). That is already in force.
This 2029 change is different—it is about how HMRC collects the money, not if you owe it. It seems to be part of HMRC’s long-term goal to make tax “digital” and “real-time,” stopping people from building up tax debts that they struggle to pay later.
Who will be affected?
You are most likely to be hit by this if:
- You have a full-time or part-time job where you pay tax via PAYE.
- You earn extra income (roughly between £1,000 and £3,000) from a side hustle.
- You currently enjoy the flexibility of paying your tax bill once a year.
What happens next?
Don’t panic just yet. The changes are scheduled for 2029, and a government consultation is promised for 2026. This consultation will be the chance for accountants and small business groups to argue against the unfair “double hit” to cash flow.
What you should do now:
- Stay organised: Keep putting aside 20-30% of your side hustle earnings into a separate savings account.
- Watch the news: Keep an eye out for the 2026 consultation.
- Don’t ignore HMRC: If you receive a “nudge letter” or a tax code notice, check it immediately.
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