UK-focused guidance, checked against official sources on 15 October 2026. The 25% reserve is an illustrative starting habit, not a tax rate or a guarantee that your bill is covered.
You started freelancing because you are good at something. Design, writing, marketing, making things happen. Probably not because you were desperate to learn the difference between a tax return deadline and a tax payment deadline. Then the first invoices get paid, your bank balance looks encouraging and the financial admin starts collecting in a folder called ‘sort later’. This is where a few small habits—and some timely advice—can save a lot of trouble.
When should you actually hire an accountant?
Before you make a financial decision you do not understand, or before the admin becomes something you are actively avoiding. You do not need to wait for a dramatic turnover figure or a letter that makes your stomach drop.
For a straightforward sole trader business, an initial paid appointment may be enough to get the setup right, with further help when you need it. A limited company usually warrants an earlier conversation about accounts, payroll, how to pay yourself and the different filing deadlines. That is an editorial recommendation about complexity, rather than a rule that every freelancer must buy a monthly package.
Think of three possible levels of help: a setup session, annual accounts and tax-return support, or ongoing bookkeeping and advice. Ask which level fits your actual business. You may need someone to explain the system and check the figures, rather than hand over every transaction.
- Before choosing your structure. Ask what being a sole trader or a company would mean for your costs, responsibilities and personal income.
- When the first meaningful payments arrive. Get a tax forecast and a sensible amount to reserve while there is still cash to put aside.
- When things become more complicated. A day job alongside freelancing, overseas work, payroll, VAT or a change in how you pay yourself are good reasons to ask for help.
- When you cannot confidently answer ‘what can I afford to take home?’ A busy business and a reassuring bank balance do not answer that question.
If the records are already messy, you can still get help now. Be honest about what is missing and ask for a quote for bringing things up to date. Waiting rarely makes the pile smaller.
The habit to start with your very first paid invoice
Put money aside for tax as each client payment arrives. Early freelance income can be sporadic: three invoices paid together, then a quiet fortnight. A percentage moved with each payment is easier to maintain than hoping there will be enough left at the end of the month.
A 25% reserve can be a useful starting budgeting habit: move a quarter of each paid client invoice, excluding any VAT, into a dedicated tax pot. Then have the percentage checked against your actual forecast. It can be too little or too much. Do not assume that the remaining 75% is all available to spend.
| Payment received, excluding any VAT | Illustrative 25% transfer | Still needed from the remainder |
|---|---|---|
| £200 | £50 | Business costs, your pay and other commitments. |
| £600 | £150 | Business costs, your pay and other commitments. |
| £1,000 | £250 | Business costs, your pay and other commitments. |
Make the transfer when the payment clears, including part-payments, rather than earmarking money that exists only on an unpaid invoice. This is a cash-management routine; your accounting method determines when income counts for tax. Ask your accountant how to handle fees deducted by a payment processor and any refunds.
Give the pot an obvious name. Keep it accessible for the tax bill and separate from your everyday spending money. Automate the transfer if your bank supports a suitable rule, or make it part of matching each payment to its invoice. It is for tax payments, not a temporary loan to your shopping budget.
Review the amount regularly. A percentage that made sense when you had a few clients may stop working when your profits rise. Ask for both an estimated bill and the dates it will be due; an annual total alone is not a cash-flow plan.
Why 25% cannot be a rule for every business
The habit of reserving money works for both sole traders and company owners. The calculation behind it is different. Neither structure comes with a flat ‘25% of everything you receive’ tax bill.
| If you trade as… | What needs planning | What the pot must not hide |
|---|---|---|
| A sole trader | Income Tax and relevant National Insurance on taxable profits, alongside your wider tax position. | Other income may already use your allowances or put additional profit into a higher tax band. |
| A limited company | The company’s Corporation Tax and any payroll liabilities, plus your own tax on salary or dividends where due. | Company tax and personal tax are separate liabilities. One pot does not turn company money into personal money. |
| Either, with VAT registration | VAT as a separate calculation and payment obligation. | VAT collected is not extra take-home income and should not disappear inside a general 25% reserve. |
HMRC explains the sole trader tax position and Income Tax bands, including the different bands in Scotland. For companies, Corporation Tax rates and reliefs depend on the circumstances. Salary, dividends, other income and student-loan repayments can all change the cash you need to reserve.
For a company, keep the company’s tax reserve in the company. Plan a separate personal reserve from money properly paid to you. Ask your accountant to explain the lawful payment route and each liability rather than simply moving company cash into a personal savings pot.
The useful question is: ‘Given my expected sales, allowable costs, other income and how I pay myself, what percentage should I reserve—and does that cover every tax payment I will need to make?’ Start saving immediately, then replace the rough assumption with that answer.
Mistake one: adding VAT because an invoice template has a VAT box
You do not add VAT simply because you are a freelancer, because your customer is a business or because you formed a limited company. You must be VAT registered to charge VAT. If you are not registered, do not copy a 20% VAT line from somebody else’s invoice.
For a UK-established business, registration is generally compulsory when taxable turnover exceeds £90,000 over the previous 12 months, or when you expect it to exceed £90,000 in the next 30 days alone. Taxable turnover is sales that count for VAT, not profit. The test does not reset each January or at your year-end.
You can also register voluntarily below the threshold. So ‘only add VAT once you reach £90,000’ misses part of the picture. Keep a rolling turnover check and get advice before registration becomes due; there are deadlines and an effective date from which VAT must be accounted for. Registering late can leave VAT owing on earlier sales.
Once registered, use the correct VAT treatment for the supply. International work and particular services can need different treatment, so do not assume every invoice gets 20%. If registration is in progress, ask how to handle invoices before your VAT number arrives.
Keep VAT separate from the income-tax habit
For an illustrative standard-rated service, a £1,000 fee plus 20% VAT produces a £1,200 customer payment. The VAT element is £200. If you were also using the provisional 25% reserve on the £1,000 fee, that would be another £250. After those two transfers, £750 remains before business costs and other commitments.
That is a budgeting example, not a VAT-return calculation: eligible input VAT, your scheme and the relevant rules affect what you pay HMRC. Have the VAT reserve reconciled to the actual liability. Do not treat the whole £1,200 as income available to divide between tax and yourself.
Mistake two: saving for one bill and meeting a payment on account
The first substantial Self Assessment bill can be a shock because you may also owe an advance payment towards the following year. These are payments on account, usually due on 31 January and 31 July.
They normally apply unless the previous year’s relevant tax bill was under £1,000 or more than 80% of the tax was paid outside Self Assessment. Each instalment is generally half the relevant previous-year bill. Not every item on a tax calculation is included, so use HMRC’s calculation rather than halving the total blindly.
Suppose your first bill is £4,000, all of it relevant to payments on account, and you have made no advance payments. You could owe £6,000 in January: the £4,000 bill plus a £2,000 first instalment for the next year. Another £2,000 instalment would then fall due in July.
This is advance tax, not paying twice for the same year. Ask for a dated payment schedule early. It is a strong reason to reserve money from the start and check whether your chosen percentage covers the timing as well as the annual total.
Mistake three: treating turnover as your salary
A £4,000 month is not automatically £4,000 you can take home. There may be software, insurance, subcontractors, payment fees, accounting costs, tax and next month’s bills to cover. An unpaid invoice is not money you can use to pay any of them.
Keep three numbers visible: sales, profit and available cash. They answer different questions. A healthy-looking account can contain money already committed elsewhere, and a profitable business can still struggle when customers pay late.
A simple monthly review helps: what came in, what went out, what remains unpaid and what needs to stay reserved? Use that to decide what you can afford, alongside the rules for your business structure. Our guide to being fully booked but still short of your income goal looks at the commercial side of that gap.
Mistake four: treating a limited company like a personal bank account
A company’s cash needs to be handled through the proper routes. HMRC’s guidance on taking money out covers salary, expenses, dividends and directors’ loans. A transfer description saying ‘wages’ or ‘dividend’ does not replace the required records and treatment.
Dividends need sufficient available profits and the appropriate paperwork. They are not a business expense that reduces Corporation Tax. Unplanned withdrawals can also create a director’s loan with additional tax complications. This is worth understanding before you start moving money around.
Ask your accountant for a clear routine: what you can pay yourself, when, how it is recorded and what needs to remain in the business. Tell them about business costs you paid personally, so those can be recorded and any reimbursement handled correctly. Avoid counting the same cost twice.
Mistake five: losing expenses—or buying things because they are ‘tax deductible’
Record expenses while you remember what they were for. Save invoices and receipts for relevant subscriptions, equipment and other business purchases. A bank entry may tell you what you paid, but the supporting document helps establish what you bought.
For sole traders, allowable business expenses can reduce taxable profit. Personal spending is not automatically allowable because it passed through a business account, and mixed-use costs need the appropriate business share. The trading allowance and actual-expense deductions also have different rules; check which treatment applies.
A deduction does not make a purchase free. In a simplified example, spending £100 and receiving £20 of tax relief still leaves an £80 cost. That illustration is not a prediction of your rate or entitlement. Buy something because the business needs it, then claim the relief you are entitled to.
Mistake six: assuming all the deadlines are the same
For Self Assessment, the usual dates include telling HMRC by 5 October after the relevant tax year if you are newly required to file, 31 October for paper returns and 31 January for online returns and payment. Payments on account can also bring a July deadline. Check the dates that apply to your own circumstances.
Starting as a sole trader does not mean waiting until you owe lots of tax to register. You generally need to register for Self Assessment if gross trading income exceeds £1,000 in a tax year. The £1,000 figure is before expenses and is separate from the VAT threshold.
A limited company has a different timetable. The usual company deadlines include annual accounts nine months after the financial year-end, Corporation Tax payment nine months and one day after the tax accounting period ends, and the Company Tax Return twelve months after that period ends. First accounts and other circumstances can differ.
The trap is waiting until the company tax-return filing deadline to work out how to pay: the payment may already have been due. Put your actual dates in a calendar and agree who prepares, checks, files and pays each item.
And check Making Tax Digital before choosing your system
Making Tax Digital for Income Tax has its own rules, separate from VAT. Under HMRC’s current timetable, eligible sole traders and landlords with qualifying income above £50,000 in 2024–25 should have started from 6 April 2026. The next stages are above £30,000 in 2025–26 from 6 April 2027, and above £20,000 in 2026–27 from 6 April 2028.
Qualifying income and exemptions matter, so use HMRC’s checker rather than assuming your start date from this month’s sales. Ask your accountant what records and compatible software you need, and whether the support is included in their fee. This Income Tax timetable is not the filing timetable for limited-company profits.
What to ask before choosing an accountant
You want someone who understands a business like yours and can explain the numbers in terms you can use. Ask about relevant qualifications, professional-body membership, insurance and experience with freelancers. HMRC has a useful guide to choosing a tax agent.
- What is included in the quoted fee: bookkeeping, accounts, tax returns, payroll, VAT, software and advice?
- Is my personal Self Assessment included if you also handle my company?
- Will you forecast what I owe and tell me how much to reserve, or only calculate it after year-end?
- What records do you need from me, how often, and who checks for missing information?
- Who handles registration, filing and payment reminders—and what remains my responsibility?
- What costs extra, and what happens if I need a question answered between scheduled reviews?
Get the scope and total price clear in writing. A low headline fee is difficult to compare with another quote until you know what each includes. Appointing an accountant also does not remove your responsibility for your tax affairs: supply complete information and review what you are asked to approve.
A small financial reset you can do this week
- Separate the money. Use a suitable business account or clearly separated records, and keep company money separate from personal money.
- Create the tax reserve. Move a provisional amount from each paid invoice, excluding VAT, and arrange an estimate to check the percentage.
- Catch up the paperwork. Match payments to invoices, save receipts and list unpaid customer balances.
- Get the dates. Record registration, filing and payment deadlines, including any payments on account.
- Book the right help. Bring your sales, costs, other income and questions to a setup or review appointment. Ask for a usable plan.
An accountant does not need to arrive at the point where everything has gone wrong. They can help you build a routine while the business is still small enough to understand at a glance.
Get paid. Put the tax money aside. Keep the evidence. Know what is yours to spend. It is a less glamorous part of freelancing than the branding, but it makes the next paid invoice feel a lot better.
