If you’re self-employed or submit a Self Assessment tax return in the UK, there’s a good chance you’ve had this moment:
“Hang on… why am I being asked to pay more tax when I’ve already paid what I owe?”
Welcome to Payments on Account — one of HMRC’s most confusing (and least loved) systems. It often feels unfair, confusing, or like a sneaky cash grab. But there is a reason it exists — even if HMRC isn’t great at explaining it.
Let’s break it down in plain English.
What Is Tax on Account?
A Payment on Account is essentially an advance payment towards next year’s tax bill.
Instead of waiting until the end of the next tax year and then asking for one big lump sum, HMRC asks certain taxpayers to pay their tax in stages.
If you qualify, you usually pay:
- 50% of your estimated next tax bill by 31 January
- The remaining 50% by 31 July
These payments are based on your previous year’s tax bill.
Who Has to Pay It?
You’ll usually be put on Payments on Account if:
- You’re self-employed, a sole trader, or receive income not taxed at source
- Your last Self Assessment tax bill was over £1,000
- Less than 80% of your tax was collected through PAYE
Employees who only earn through PAYE normally don’t deal with this at all — which is why it often feels like a shock when you first go self-employed.
Why Does HMRC Do This?
Short answer: cash flow and risk management.
Longer answer: HMRC doesn’t want to wait up to 22 months to collect tax from people whose income isn’t taxed automatically.
Here’s what would happen without Payments on Account:
- You earn money in the 2024/25 tax year
- The tax year ends in April 2025
- You submit your return in January 2026
- You pay the tax then
That’s a long time for HMRC to wait — and a long time for taxpayers to potentially spend money that was never really theirs.
So instead, HMRC spreads the cost and:
- Gets tax earlier
- Reduces the risk of non-payment
- Helps taxpayers avoid a single huge bill (in theory)
Why It Feels So Painful
Payments on Account hurt most in your first few years of self-employment.
That’s because, in January, you’re often paying:
- The full tax bill for last year, plus
- 50% of next year’s estimated bill
It can feel like you’re being taxed twice — but you’re not. You’re just paying ahead of time.
Example:
- Your tax bill for 2023/24 is £6,000
- HMRC assumes 2024/25 will be similar
- In January you pay:
- £6,000 (what you owe)
- £3,000 (first payment on account)
Total January bill: £9,000
Ouch.
What If Your Income Drops?
This is where Payments on Account get slightly fairer.
If you know your income is going to be lower next year, you can apply to reduce your Payments on Account.
But — and this is important — if you reduce them too much and end up underpaying, HMRC can:
- Charge interest
- Potentially add penalties
So it’s a balancing act: reduce them carefully, not optimistically.
What Happens at the End of the Year?
Once your next tax return is submitted:
- HMRC recalculates what you actually owe
- Any overpayment is:
- Refunded, or
- Set against future tax
So the money doesn’t disappear — it just sits in HMRC’s hands longer than most people would like.
The Real Reason People Hate It
Let’s be honest: the problem isn’t just the system — it’s the communication.
HMRC:
- Rarely explains this clearly upfront
- Uses confusing language
- Doesn’t prepare new self-employed people for the first big bill
So people feel blindsided, stressed, and sometimes panicked — even though the tax itself isn’t new.
The Bottom Line
HMRC makes you pay tax on account because:
- Your income isn’t taxed automatically
- They want tax collected earlier and more reliably
- It smooths payments over time (even if it doesn’t feel like it)
It’s not a penalty, and it’s not extra tax — it’s timing.
Once you’ve been self-employed for a few years and plan for it properly, Payments on Account become predictable. Still annoying — but predictable.
And in the world of tax, predictable is about as good as it gets.
Get in touch with us at Shenkman Accountancy if you might be able to pay on account for the first time!
