How to Budget for Your Tax Bill as Self-Employed in the UK

Knowing how to budget for your tax bill when self-employed is one of the biggest financial challenges sole traders and freelancers face. Unlike employees who have tax deducted through PAYE each month, self-employed people receive their full income and are responsible for setting money aside to cover Income Tax and National Insurance when they fall due.

This guide covers how much tax to save as self-employed, where to keep your tax savings, the payment options HMRC offers, and how to avoid the January shock that catches so many people in their first year of Self Assessment.

How Much Tax to Save When Self-Employed

Set aside 25-30% of your taxable profit each month. This is the most widely used rule of thumb for self-employed tax savings, covering both Income Tax and Class 4 National Insurance — the two main charges on self-employed earnings.

The exact percentage depends on your total income and tax band:

Annual taxable profit (2025/26)	Effective tax + NI rate	Suggested savings rate
Up to £12,570 (personal allowance)	0% Income Tax	10% (NI only)
£12,571 – £50,270 (basic rate)	20% tax + ~6% Class 4 NI	25-27%
£50,271 – £125,140 (higher rate)	40% tax + ~2% Class 4 NI	30-35%
Over £125,140 (additional rate)	45% tax + ~2% Class 4 NI	35-40%

Example: Sarah earns £3,500 profit in a month from her freelance design business. At the basic rate, she sets aside 27% — that's £945 into a separate savings account. Over the year, she accumulates £11,340 to cover her tax bill.

If you also have employment income taxed through PAYE, your self-employed profit sits on top of your employed earnings. This may push some of your profit into a higher tax band, so you may need to save at a higher rate than the table suggests.

Where to Keep Your Self-Employed Tax Savings

The golden rule is to keep tax money separate from your day-to-day spending. If it sits in your current account, it's too easy to spend.

Options for your tax savings account:

• Separate savings account — an instant-access account at a different bank from your main account creates a psychological barrier. Many banks offer accounts that can be opened in minutes
• Easy-access ISA — if you want to earn tax-free interest on money that will eventually go to HMRC
• Business savings account — some business bank accounts offer linked savings pots specifically for tax

Tips for making it work:

• Set up an automatic standing order on the day you typically get paid or invoice
• Transfer the money as soon as income arrives — not at the end of the month when it may have been spent
• Treat the tax savings as money that belongs to HMRC, not to you

Example: James runs a plumbing business. He invoices clients at the end of each week. Every Friday, he transfers 28% of his week's takings (minus materials) to his tax savings account. By January, he has enough to cover his bill without stress.

HMRC's Budget Payment Plan

If you prefer to pay HMRC regularly rather than saving into your own account, you can set up a Budget Payment Plan — a weekly or monthly Direct Debit that pays money directly to HMRC towards your next tax bill.

How It Works

• You choose how much to pay each week or month
• Payments are collected by Direct Debit
• The money is credited against your next Self Assessment bill
• At the payment deadline (31 January or 31 July), any remaining balance is due

Example: Tom expects a £6,000 tax bill for 2025/26. He sets up a Budget Payment Plan paying £500 per month from April. By January, he's paid £5,000 directly to HMRC and only owes £1,000 at the deadline.

Setting Up a Budget Payment Plan

1. Sign in to your HMRC online account
2. Go to Self Assessment
3. Select the Direct Debit and Budget Payment Plan option
4. Choose weekly or monthly payments
5. Set your payment amount

Requirements:

• You need to be up to date on all previous Self Assessment payments
• You can pause payments for up to 6 months if needed
• If you overpay, you can request a refund

Budget Payment Plan vs Saving Yourself

Factor	Budget Payment Plan	Separate savings account
Where the money sits	With HMRC	In your account
Interest earned	None	You keep the interest
Flexibility	Can pause for up to 6 months	Full access any time
Discipline	Automatic — harder to dip into	Requires self-control
Overpayment	Refund available on request	You keep the surplus

Many self-employed people find the Budget Payment Plan helpful because the money goes straight to HMRC and can't be accidentally spent. Others prefer keeping control of their money and earning interest. Either approach works — the key is having a system.

Self Assessment Payment Schedule: When Tax Is Due

Self Assessment tax is paid on two fixed dates each year:

Date	What you pay
31 January	Balancing payment for the previous tax year + first payment on account for the current year
31 July	Second payment on account for the current year

For more on how payments on account work — including the first-year shock where you pay 150% of your annual bill — see our payments on account guide.

Budget Around the January Double Payment

The 31 January deadline is the hardest because two payments are due at once: your remaining tax from the previous year and the first advance payment towards the current year.

Example: Emma's 2024/25 tax bill is £5,000. On 31 January 2026, she pays:

Payment	Amount
Balancing payment (remainder of 2024/25 tax)	£500
First payment on account (50% of 2024/25 liability)	£2,500
Total due 31 January	£3,000

Then on 31 July 2026, she pays another £2,500 (second payment on account).

If you're in your first year of Self Assessment, your January bill can be 150% of your annual tax — 100% for the year just gone, plus 50% in advance for next year. Plan for this from day one.

Adjusting Your Tax Savings Rate Through the Year

Your income may not be steady throughout the year. Instead of saving a fixed percentage, consider reviewing your position quarterly.

A quarterly review checklist:

1. Total up your income and expenses for the quarter
2. Estimate your annual profit based on the trend
3. Check how much you've saved against what you're likely to owe
4. Adjust your savings rate up or down as needed

This becomes particularly relevant under Making Tax Digital, which requires quarterly updates from April 2026 for qualifying income over £50,000. The quarterly reporting rhythm naturally aligns with reviewing your tax savings position.

Accounting software like FreeAgent, Xero, or QuickBooks can estimate your tax liability in real time based on your recorded income and expenses. This removes much of the guesswork.

What to Do If You Can't Pay Your Tax Bill

If your tax bill is larger than expected and you can't pay the full amount by the deadline, you have options:

Time to Pay arrangement: You can set up a payment plan to spread your bill over up to 12 months. You can do this online if:

• You owe less than £30,000
• Your tax return is filed
• You're within 60 days of the payment deadline

Payment through your tax code: If you owe less than £3,000 and also have PAYE employment, HMRC can collect the tax through your employer by adjusting your tax code. This spreads the amount over 12 months with no interest.

Partial payment: If you can't pay everything, pay what you can. Interest is charged on the unpaid balance (set at the Bank of England base rate plus 4%), but partial payment reduces both the interest and the risk of additional penalties.

For more on penalties and interest for late payment, see our guide on what happens if you miss the deadline.

Frequently Asked Questions

How much should I save for tax if I'm newly self-employed?

A good starting point is 25-30% of your profit (income minus allowable expenses). This covers Income Tax at the basic rate and Class 4 National Insurance. If you also have employment income, your self-employed profit may be taxed at a higher rate — consider saving 30-35% to be safe.

Can I pay my Self Assessment tax monthly?

Yes, through HMRC's Budget Payment Plan. You set up a weekly or monthly Direct Debit that pays money towards your next tax bill throughout the year. This means you have less to pay at the January and July deadlines.

What happens if I save too much for tax?

If your tax bill is lower than expected, the money stays in your savings account — you keep it. If you used a Budget Payment Plan and overpaid, you can request a refund from HMRC.

Should I save based on income or profit?

Save based on profit (income minus allowable expenses). Your tax is calculated on your taxable profit, not your total turnover. If you haven't claimed your expenses yet, your estimated tax bill may be higher than it needs to be.

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This guide is for informational purposes only and does not constitute tax, legal, or financial advice. Tax rules change frequently. Always verify current requirements on GOV.UK or consult a qualified accountant for your specific situation.

Official Sources

• Pay your Self Assessment tax bill - GOV.UK
• Budget Payment Plan - GOV.UK
• If you cannot pay your tax bill on time - GOV.UK
• Self Assessment tax returns - GOV.UK