If you're self-employed and you've just discovered that your January tax bill is somehow bigger than expected, you're not alone. Many people are caught off guard the first time they encounter "Payments on Account", those extra amounts HMRC asks for on top of what you actually owe for the year. It can feel like a nasty surprise, but once you understand how it works, it becomes far easier to plan for and much less stressful to manage.
This guide breaks down what Payments on Account actually are, why they exist, and practical ways to build them into your budget so they stop feeling like an ambush every January and July.
What Are Payments on Account?
Payments on Account are advance payments towards your next tax bill, made in addition to what you owe for the year you've just finished. In simple terms, HMRC assumes that if you owed a certain amount of tax last year, you're likely to owe a similar amount this year, so it asks you to pay some of it in advance.
This means that alongside your Self Assessment bill for the tax year just gone, you may also be asked to pay a contribution towards the current tax year, split across two dates. That's why your January bill can sometimes look almost double what you were expecting, because you're effectively paying for two things at once.
The exact rules on when Payments on Account apply, and how they're calculated, can change, so it's always worth checking the current position directly on GOV.UK or speaking to an accountant if you're unsure whether they apply to you. What doesn't change is the underlying principle: HMRC wants tax paid closer to when the income is earned, rather than one large sum a year later.
How Your Tax Bill (and Payments on Account) Are Built Up
Understanding what makes up your tax bill helps explain why Payments on Account can feel so large. As a self-employed person, your bill typically includes:
- Income Tax, calculated on your profits above your tax-free Personal Allowance. For most people, the standard Personal Allowance is £12,570, with tax charged at 20% on the next portion of income, then higher rates as profits increase, [as set out by HMRC](https://www.gov.uk/income-tax-rates).
- Class 4 National Insurance, which self-employed workers pay on profits above a certain level, currently charged at 6% on profits between £12,570 and £50,270, and 2% above that. You may also choose to pay Class 2 National Insurance contributions, which help protect your entitlement to certain benefits and your State Pension, [according to GOV.UK's National Insurance guidance](https://www.gov.uk/national-insurance/how-much-you-pay).
When HMRC calculates your Payments on Account, it's essentially looking at your total Income Tax and Class 4 National Insurance liability from the previous year and asking you to pay towards a similar amount for the year ahead, split into two instalments. If your profits fluctuate year to year, freelance work in particular, this can mean your Payments on Account don't always match what you actually end up owing, which is worth keeping in mind.
Why It Can Feel Like a Shock
There are a few reasons Payments on Account tend to catch people off guard:
- It's your first year of self-employment. Many new sole traders don't realise Payments on Account exist until their first Self Assessment bill lands, and by then there's little time to prepare.
- Your income has grown. If you earned more this year than last, your Payments on Account (based on last year's figures) may end up being lower than what you actually owe, meaning there's a "balancing payment" still due on top.
- You haven't been setting tax money aside consistently. If you're used to treating all your income as spendable, a bill that includes both last year's tax and next year's advance payment can feel like it's come out of nowhere.
None of this means you're doing anything wrong. It's simply how the system works, and once you build it into your regular budgeting, it becomes far more manageable.
Practical Ways to Budget for Payments on Account
1. Set aside a percentage of every payment you receive
Rather than waiting until your tax bill arrives to think about it, get into the habit of moving a percentage of each invoice or payment into a separate savings account as soon as it lands. Many self-employed people aim for somewhere between 20-30% of income, though your own figure will depend on your profit level and whether you're likely to move into a higher tax band. If you're unsure what percentage suits your situation, a regulated adviser or accountant can help you work out a realistic figure based on your income pattern.
2. Keep your tax savings completely separate
It's tempting to let tax money sit in your everyday current account "just in case," but this makes it far too easy to accidentally spend it. A dedicated savings pot, ideally one you don't touch for anything else, helps you see at a glance whether you're on track. If you haven't already, our guide on [budgeting basics](https://genwel.app) can help you build a system that separates essential savings from spending money.
3. Track your two payment dates in your calendar
Payments on Account are typically due twice a year. Missing these dates, or forgetting they're coming, is one of the most common reasons people end up scrambling. Set calendar reminders well in advance, not just on the day itself, so you have time to check your balance and top up your savings pot if needed.
4. Review your figures regularly, not just once a year
If your income has dropped compared to the previous year, you may be able to ask HMRC to reduce your Payments on Account so you're not overpaying based on outdated figures. Equally, if your income has risen, it's worth setting aside more than your Payments on Account cover, so you're not left with a large balancing payment. Because getting this wrong (reducing payments too far, for example) can lead to interest charges, it's worth checking the current rules on GOV.UK or speaking to an accountant before making changes.
5. Use a simple spreadsheet or app to estimate your liability
You don't need anything complicated. A basic running total of income, minus allowable expenses, gives you a rough estimate of your profit, which you can use to sense-check whether your tax savings are keeping pace. If you're just starting out and want help figuring out what to charge in the first place so your tax planning is easier from day one, our guide on [pricing your freelance services](https://genwel.app) is a useful companion piece.
Building a Tax Savings Habit That Sticks
The self-employed workers who find tax time least stressful tend to share one habit: they treat tax money as "not theirs" from the moment it arrives. It never enters their mental spending pot in the first place, which removes the temptation to dip into it.
If you're someone who finds saving difficult generally, it might help to explore this alongside your wider money habits. Our piece on [financial self-care](https://genwel.app) looks at building sustainable habits around money, not just cutting back, which can make consistent tax saving feel less like a chore and more like part of your normal routine.
What to Do If You're Worried About Affording a Payment
If a payment deadline is approaching and you don't think you'll have enough set aside, don't ignore it. Contact HMRC as early as possible, before the payment is due if you can, to discuss your options. It's also worth speaking to [MoneyHelper](https://www.moneyhelper.org.uk) or [Citizens Advice](https://www.citizensadvice.org.uk), both of which offer free, impartial guidance if you're struggling with a tax bill or wider debt concerns. Getting advice early almost always leads to better outcomes than waiting until a deadline has passed.
When to Get Professional Help
Tax rules, thresholds and rates can change from year to year, and everyone's self-employment situation is different. If you're unsure how Payments on Account apply to you, whether you're eligible to reduce them, or how to plan around a changing income, it's worth speaking to a qualified accountant or a regulated financial adviser. If you ever deal with a financial firm around payments or accounts and something feels off, you can check your rights and how to report concerns via the [FCA's consumer guidance](https://www.fca.org.uk/consumers/your-rights-financial-services).
Final Thoughts
Payments on Account don't have to be a source of dread every January and July. Once you understand that they're simply an advance on tax you'd owe anyway, and you build a habit of setting money aside as you earn rather than scrambling at deadline time, they become just another predictable part of running your own business. Start small, stay consistent, and don't be afraid to ask for help from HMRC, an accountant, or free services like MoneyHelper if your circumstances change. Your future self, the one who isn't panicking in January, will thank you for it.
