You paid your tax bill back in January. Sorted, filed, done.
Then, six months later, a letter or an email lands from HMRC asking for more money. No new invoice, no new income you can point to. Just a bill, due by 31 July, for roughly the same amount you already paid.
If that’s ever thrown you, you’re not alone. It’s one of the most common sources of confusion (and unplanned stress) we see among the sole traders, freelancers and small business owners we work with. The good news is that once you understand what’s actually happening, it stops feeling like a surprise and becomes something you can plan around completely.
What a “payment on account” actually is
If you’re self-employed, or you have income HMRC doesn’t collect tax from automatically (rental income, dividends, freelance work), you pay tax through Self Assessment. But rather than waiting a full year to collect what you owe, HMRC often asks you to pay in advance, based on an estimate of what you’re likely to owe again.
Here’s how it works in practice. If your Self Assessment bill for a tax year comes to more than £1,000, and less than 80% of your income is already taxed at source (through PAYE, for example), HMRC assumes your income next year will look similar. So it asks you to pay towards next year’s bill in two instalments:
- 31 January: the first payment on account, paid alongside your final bill for the previous year
- 31 July: the second payment on account, for the same amount again
Each payment is usually half of your previous year’s tax bill. So if you owed £6,000 last year, you’d typically pay £3,000 in January and another £3,000 in July, for a total of £6,000 paid in advance towards the year that’s still in progress.
It isn’t a penalty, and it isn’t a mistake on your return. It’s simply HMRC collecting tax closer to when the income is earned, rather than making you find a full year’s tax bill in one go the following January.
Why it catches people out
The confusion almost always comes down to timing, not maths. Most people mentally file their tax bill as “sorted” the moment they pay it in January. The July payment then arrives as if from nowhere, often when cash flow is already tighter: summer holidays, quieter trading months, or funds already earmarked for something else.
There’s also a second layer of confusion. If your actual income for the year turns out to be lower than the year before, you could end up paying more than you actually owe through these advance payments, only getting the balance back (or offset) once your real return is filed the following January. That mismatch between what you’re asked to pay and what you might actually owe is where a lot of the frustration comes from.
How to plan ahead so it never feels like a shock again
The fix isn’t complicated, but it does need to be deliberate. A few things that make a real difference:
1. Know both numbers in advance, not just one. As soon as your January tax bill is calculated, you already know what your July payment will be: it’s the same figure. Treat it as a known cost from day one of the tax year, not something to think about closer to the date.
2. Set aside a monthly amount, not a lump sum. Rather than trying to find several thousand pounds in one go twice a year, work out what both payments add up to annually and set aside roughly a twelfth of that every month, ideally in a separate savings account you don’t touch for anything else.
3. Check whether a reduction on account makes sense. If you genuinely expect this year’s income to be significantly lower than last year’s, it’s possible to apply to reduce your payments on account. This isn’t something to do casually (get it wrong and you can end up with interest charged on an underpayment), but where it’s the right call, it can meaningfully ease pressure on cash flow.
4. Review your numbers well before January, not in it. The July payment is really a preview of the conversation you’ll need to have again in January. Reviewing your figures in autumn, rather than waiting for the January deadline, gives you time to plan properly rather than react.
The bigger picture
Payments on account are a good example of something we come back to often: most tax stress isn’t caused by the tax itself, it’s caused by not seeing it coming. Once you understand why a bill exists and roughly what it’s going to be, it becomes a planning exercise rather than a scramble.
If your July payment caught you off guard this year, or you’d simply like a clearer picture of what’s coming in January, that’s exactly the kind of conversation we’re happy to have, before the deadline rather than after it.
Final Thought
A quote from our Principal, Sunil Aggarwal:
“The July payment itself isn’t the problem. Not knowing it was coming is. Once you can see both payments for what they are, they stop being a shock and start being part of the plan.”
Book a Self Assessment planning call with DRS and we’ll walk through your numbers together, show our workings, and make sure nothing about your tax bill catches you off guard again.
- Email: info@drs-tax.com
- Telephone: 020 8059 1891
- Or submit an enquiry via our Contact Us page