If you’re self-employed in the UK, knowing how much tax to put aside can prevent an unexpected HMRC bill from disrupting your finances. Unlike employees who usually have Income Tax and National Insurance deducted through PAYE, sole traders and freelancers generally need to budget for their own tax payments.

As a starting point, many self-employed people should consider putting aside 25% to 30% of their taxable profit for Income Tax and National Insurance. However, the right percentage depends on your earnings, other income, tax band, location and whether you have payments on account to make.

For the 2026/27 tax year, a sole trader earning £40,000 in annual taxable profit in England, Wales or Northern Ireland, with no other taxable income, would generally owe approximately £6,611 in Income Tax and Class 4 National Insurance.

This guide explains how much tax to save, how to calculate your likely bill, when HMRC expects payment and how to avoid common budgeting mistakes.

How Much Tax Should I Put Aside if I’m Self-Employed?

Most UK sole traders can use 25% to 30% of taxable profit as an initial tax-saving target, but this is a budgeting rule rather than an official HMRC percentage.

Your actual liability depends on your circumstances. Someone earning £20,000 may need to save considerably less, while someone earning £70,000 may need to put aside more than 30% of their total profit.

Here is a practical starting guide.

These are illustrative planning ranges, not effective tax rates. They assume self-employment is your only taxable income and are primarily suited to England, Wales and Northern Ireland. Scottish Income Tax rates differ.

For a more accurate figure, calculate your estimated Income Tax and National Insurance based on your expected annual profit.

Should I Save Tax From Turnover or Profit?

You should normally calculate your Income Tax savings from taxable profit, not total business turnover.

Turnover is the total income your business receives from sales and services before expenses. Taxable profit is broadly your business income minus allowable business expenses, with adjustments where required by tax rules.

For example:

In this example, you would aim to save £11,250 over the year as a practical buffer, subject to your actual tax calculation and payment obligations.

Setting aside 25% of your full £60,000 turnover would mean saving £15,000, which may unnecessarily restrict your business cash flow.

However, if you have not yet calculated your expenses, temporarily saving a percentage of revenue can be a useful precaution until your bookkeeping is up to date.

What Tax Do Self-Employed People Pay in 2026/27?

Self-employed individuals generally need to budget for Income Tax and Class 4 National Insurance. Depending on their business, they may also have VAT obligations, student loan repayments or other tax liabilities.

Income Tax Rates for 2026/27

For England, Wales and Northern Ireland, the main Income Tax bands for non-savings income are:

The standard Personal Allowance is £12,570, although it reduces by £1 for every £2 of adjusted net income above £100,000. It is fully withdrawn at £125,140.

If you live in Scotland, different Scottish Income Tax bands and rates apply to non-savings, non-dividend income. Your tax-saving percentage should reflect those differences.

National Insurance for Sole Traders in 2026/27

Most self-employed individuals with sufficient profits pay Class 4 National Insurance.

Class 2 National Insurance is generally treated as paid for qualifying self-employed people with profits at or above the Small Profits Threshold. Those below the threshold may be able to pay voluntary Class 2 contributions to protect their National Insurance record.

This means you should consider both Income Tax and Class 4 National Insurance when deciding how much money to save.

How Much Tax Should I Put Aside on £20,000, £30,000 or £50,000?

The following examples show estimated annual liabilities for self-employed individuals in England, Wales and Northern Ireland for the 2026/27 tax year.

These examples assume you have the full Personal Allowance, no other taxable income, no student loan repayments and no special reliefs.

The table shows why the same tax-saving percentage is not suitable for everyone.

A sole trader earning £20,000 may have an effective tax and National Insurance rate below 10%, whereas someone earning £60,000 could have an effective rate above 23%.

Saving more than the estimated liability can provide additional protection against higher profits, payments on account and unexpected expenses.

How Do I Calculate How Much Tax to Put Aside?

You can estimate your self-employed tax savings using five steps.

Step 1: Estimate Your Annual Business Income

Start with the total revenue you expect to earn during the tax year.

For example, if your average monthly business income is £5,000:

£5,000 × 12 = £60,000 annual turnover.

If your earnings fluctuate, use a realistic forecast based on invoices, contracts and previous trading periods.

Step 2: Deduct Allowable Business Expenses

Deduct expenses that qualify for tax relief, such as eligible software subscriptions, office costs, professional fees, business insurance and travel expenses.

Suppose you expect £15,000 in allowable expenses:

£60,000 − £15,000 = £45,000 estimated taxable profit.

The actual calculation may differ depending on your accounting method, capital allowances and other tax adjustments.

Step 3: Calculate Income Tax

Using the standard Personal Allowance:

£45,000 − £12,570 = £32,430.

At the 20% basic rate:

£32,430 × 20% = £6,486 Income Tax.

Step 4: Calculate National Insurance

Class 4 National Insurance on the same profit:

£32,430 × 6% = £1,945.80.

Estimated total:

£6,486 + £1,945.80 = £8,431.80.

Step 5: Divide Your Estimated Tax by 12

£8,431.80 ÷ 12 = £702.65 per month.

In this example, saving approximately £703 per month would cover the estimated annual Income Tax and Class 4 National Insurance liability, excluding any additional obligations.

For extra protection, you might instead save 25% of your £45,000 profit, equivalent to £937.50 per month.

That creates a buffer, but it is important to remember that payments on account can increase the amount due at a particular deadline.

How Much Tax Should I Put Aside Each Month?

A simple way to manage self-employed tax is to move money into a separate savings account whenever you receive business income.

For example, if you earn £4,000 in monthly taxable profit:

This approach works particularly well for freelancers, consultants, contractors and sole traders whose monthly income changes.

For a more accurate result, revisit your annual profit forecast every quarter and adjust the amount you save.

Do I Need to Save Extra for Payments on Account?

Yes. If you are required to make Self Assessment payments on account, you may need additional savings for your first major tax payment.

Payments on account are advance payments towards your next tax year’s Income Tax and Class 4 National Insurance bill.

HMRC generally requires them when your previous year’s relevant Self Assessment liability exceeds £1,000, unless more than 80% of the relevant tax was collected at source.

Each payment is normally 50% of the previous year’s qualifying liability.

Example: How Payments on Account Affect Your First Tax Bill

Suppose your first Self Assessment calculation shows that you owe £6,000 in Income Tax and Class 4 National Insurance.

Your payment schedule could look like this:

This means your first January payment could be 150% of the previous year’s qualifying tax liability.

However, the additional £3,000 is an advance payment towards the following tax year, not an extra tax charge.

If you expect your profits to fall, you may be able to apply to reduce your payments on account. Be careful not to reduce them excessively, as HMRC may charge interest if insufficient tax is paid.

Accfirm tip: When planning your tax savings, consider your next payment deadline rather than relying solely on your annual tax calculation.

When Do I Need to Pay My Self-Employed Tax?

Most sole traders report their business income through Self Assessment.

For the 2026/27 tax year, which runs from 6 April 2026 to 5 April 2027, the key deadlines are:

These are standard statutory deadlines. Specific circumstances may affect your obligations.

Missing a filing deadline can trigger an initial £100 late-filing penalty, even if there is no tax to pay, subject to the applicable rules. Further penalties may apply for continued delays.

Late payment can also result in interest and penalties.

Saving throughout the year reduces the risk of needing to borrow money or use business working capital to settle your tax bill.

Should I Put Aside Money for VAT as Well?

Yes. If your business is VAT registered, you should budget for VAT separately from Income Tax and National Insurance.

The VAT registration threshold is £90,000 of taxable turnover over a rolling 12-month period, although other registration rules also apply. Businesses below the threshold may choose to register voluntarily.

The standard VAT rate is 20%, but some goods and services qualify for reduced or zero rates, or are exempt.

For example, suppose you invoice a client:

The £200 VAT collected is not automatically money you can spend. Your actual VAT payment depends on the VAT you charge, the input VAT you can recover and the VAT accounting scheme you use.

Under the normal VAT accounting rules, you may offset eligible input VAT against output VAT. Different arrangements apply under schemes such as the Flat Rate Scheme.

A useful approach is to maintain separate savings for:

• Income Tax and National Insurance.

• VAT liabilities.

• Business expenses and operating costs.

This helps prevent confusion between business revenue and amounts that may need to be paid to HMRC.

How Much Tax Should a Limited Company Director Put Aside?

Limited company directors should approach tax savings differently from sole traders.

A limited company is a separate legal entity. It may pay Corporation Tax on taxable profits, while directors and shareholders can have personal tax liabilities on salaries, dividends and other income.

Corporation Tax Rates for 2026/27

The UK Corporation Tax rates include:

These limits can be reduced for short accounting periods and divided where there are associated companies. The treatment also depends on the company’s circumstances.

For example, a qualifying limited company with £40,000 in taxable profits may have a Corporation Tax liability of £7,600 at the 19% rate.

A company with £100,000 in taxable profits may pay more than 19% due to the marginal relief calculation.

Directors must also consider PAYE, employer National Insurance, dividend tax and any personal Self Assessment liability.

For the 2026/27 tax year, the dividend allowance is £500. The ordinary dividend tax rate is 10.75%, the upper rate is 35.75% and the additional rate is 39.35%, subject to the relevant bands and allowances.

Rather than saving a flat 25% of all company receipts, directors should estimate the company’s tax separately from their personal tax obligations.

What if I Have a Full-Time Job and Self-Employed Income?

If you work as an employee and also earn self-employed income, you may need to put aside a higher percentage of your business profits.

Your PAYE salary can use up some or all of your Personal Allowance and basic-rate Income Tax band.

For example, suppose you earn:

• £35,000 from employment.

• £15,000 in self-employed taxable profit.

• £50,000 in total taxable income before allowances.

Assuming you live in England, Wales or Northern Ireland, and have no other adjustments, your self-employed profit would generally fall within the basic-rate Income Tax band.

The additional Income Tax attributable to the £15,000 business profit would be approximately £3,000.

Your self-employed Class 4 National Insurance liability would generally be £145.80, based on the relevant profit thresholds, before considering any special interaction rules.

Your estimated additional liability would therefore be approximately £3,145.80, subject to your overall circumstances.

This is why someone with employment income should not automatically follow the same tax-saving percentage as a full-time sole trader.

How Does Making Tax Digital Affect Tax Savings?

Making Tax Digital for Income Tax is changing how eligible sole traders and landlords report their income and expenses.

The phased introduction includes:

Qualifying income broadly refers to gross income from self-employment and property, before expenses, rather than taxable profit. The applicable test is based on the relevant previous tax return, subject to HMRC’s rules and exemptions.

Eligible taxpayers generally need to maintain digital records, use compatible software and send quarterly updates to HMRC, followed by the required year-end tax return.

Making Tax Digital does not mean you must pay Income Tax every quarter. The existing Self Assessment payment rules generally continue to apply.

However, keeping your records up to date throughout the year can make it easier to forecast profits and adjust the money you put aside.

Accfirm can help businesses understand their digital record-keeping obligations and maintain more reliable financial information.

What Is the Best Way to Save for Self Assessment Tax?

The most effective approach is to treat tax savings as a regular business commitment rather than an annual emergency.

1. Open a Separate Tax Savings Account

Keep money intended for HMRC separate from everyday spending. You can transfer a fixed percentage of your profit each month or whenever you receive client payments.

2. Keep Your Bookkeeping Up to Date

Accurate records help you identify business income, allowable expenses, outstanding invoices and potential tax liabilities.

Accounting software such as Xero, QuickBooks or FreeAgent may help you organise transactions and monitor business performance.

3. Review Your Tax Estimate Every Quarter

Your income may increase or decrease during the year. Review your estimated taxable profit regularly rather than relying on a percentage chosen when you started trading.

4. Plan for Payments on Account

If you are approaching your first Self Assessment payment, check whether you will also need to make an advance payment for the next tax year.

5. Speak With an Accountant

An accountant can help calculate your likely tax liability, identify legitimate reliefs and plan your payments around your business cash flow.

If you need ongoing assistance, Accfirm’s sole trader accountants can help you manage your bookkeeping, Self Assessment and tax planning.

Internal linking note: Replace the Accfirm homepage URL above with your published Sole Trader Accountants service-page URL.

What Common Mistakes Should I Avoid When Saving for Tax?

Even profitable businesses can experience cash flow problems if they fail to plan for tax.

Saving tax from turnover without considering expenses. This can cause you to set aside too much money, reducing the funds available for running your business.

Saving too little when your profits increase. Higher profits can move part of your income into a higher tax band. Review your savings percentage when your business grows.

Ignoring payments on account. Your January payment may include both a balancing payment and an advance payment towards the following tax year.

Spending VAT collected from customers. VAT receipts should be considered separately from money available for business expenses.

Forgetting about other income. Employment income, rental income, dividends and other taxable income can affect your total Income Tax liability.

Assuming all business purchases are tax deductible. Expenses must meet the relevant HMRC rules. Some costs may be partly deductible, disallowed or subject to capital allowance rules.

Leaving tax calculations until January. By the time the deadline approaches, it may be too late to build up sufficient savings comfortably.

How Can Accfirm Help You Plan Your Tax Savings?

Managing tax payments becomes easier when you understand how much you owe, when payments are due and what your business can afford to set aside.

At Accfirm, we help UK sole traders, freelancers, contractors and small business owners manage their accounting and tax responsibilities with greater confidence.

Our services include Self Assessment tax returns, bookkeeping, Income Tax planning, National Insurance calculations, VAT support and guidance on Making Tax Digital.

We can help you estimate your annual tax liability, understand payments on account and organise your financial records so you can make informed business decisions.

Need help working out how much tax to put aside? Contact Accfirm today to discuss your accounting requirements and receive practical support tailored to your business.

Get an Instant Quote | Speak to Accfirm

Frequently Asked Questions

Is Putting Aside 30% Enough for Self-Employed Tax?

Saving 30% of taxable profit may be sufficient for many sole traders with moderate earnings, but it is not guaranteed. Higher-rate taxpayers, people with other taxable income and those facing payments on account may need a larger reserve.

How Much Tax Should I Save if I Earn £1,000 a Month?

If £1,000 is your only monthly taxable business profit, your annual profit would be £12,000. Assuming you have the full Personal Allowance and no other taxable income, you would generally have no Income Tax or Class 4 National Insurance liability. Your circumstances may still require record-keeping or reporting.

How Much Tax Should I Put Aside if I Earn £3,000 a Month?

If £3,000 represents monthly taxable profit, your annual profit would be £36,000. Under the standard 2026/27 rates for England, Wales and Northern Ireland, your estimated Income Tax and Class 4 National Insurance would be £6,092. Saving approximately £508 per month would cover that estimate, excluding payments on account and other liabilities.

Do I Need to Pay Tax in My First Year of Self-Employment?

You may owe Income Tax and National Insurance on your first year’s taxable profits, even though the payment is generally due after the end of the tax year. It is sensible to start saving as soon as you begin earning.

Can I Pay My Self Assessment Tax Monthly?

HMRC offers a Budget Payment Plan for eligible taxpayers who want to make regular payments towards a future Self Assessment bill. This is separate from a Time to Pay arrangement for tax that is already due. Eligibility and conditions apply.

Should I Put Tax Money in a Separate Bank Account?

Yes, a dedicated savings account can help you keep tax reserves separate from business spending. It also makes it easier to see whether you are saving enough to meet your next HMRC deadline.

Does the £1,000 Trading Allowance Reduce My Tax Bill?

The trading allowance can provide up to £1,000 of relief against eligible trading income. Depending on your circumstances, you may claim the allowance instead of deducting actual business expenses. You cannot generally claim both against the same trading income.

How Much Tax Should I Put Aside as a Freelancer?

Freelancers who operate as sole traders normally follow the same Income Tax and Class 4 National Insurance rules as other self-employed individuals. A 25%–30% savings target can be a useful starting point, but your actual tax calculation should determine the final amount.

Final Thoughts: How Much Tax Should You Put Aside?

Knowing how much tax to put aside is an important part of managing your finances as a self-employed professional.

For many sole traders, saving 25% to 30% of taxable profit provides a useful starting buffer. However, the most reliable approach is to estimate your actual Income Tax and National Insurance liability, consider any payments on account and review your figures regularly.

Keep your business records organised, separate your tax savings from everyday spending and plan ahead for HMRC deadlines.

If you are unsure how much to save, Accfirm can help you understand your obligations and plan your tax payments with confidence.