Sole Practitioner Solicitor Tax: Complete Guide for 2025/26

Running your own practice means you carry the whole of the sole practitioner solicitor tax position yourself: there is no payroll deducting tax before you see the money, and no partnership to share the administration. Understanding how the pieces fit together (income tax, National Insurance, allowable expenses, payments on account and Making Tax Digital) is what keeps the practice both compliant and cash-flow stable.

This guide sets out everything a sole practitioner solicitor needs for the 2025/26 tax year and the changes already on the horizon, from the basic self-assessment obligations through to the point at which incorporation starts to make sense. One change worth flagging at the outset: Class 2 National Insurance was removed from 6 April 2024, so any older guidance quoting a flat weekly Class 2 amount is now wrong.

Tax Status and Structure for Sole Practitioners

As a sole practitioner solicitor you operate as a self-employed individual for tax purposes. All practice income is treated as your personal income, subject to income tax and National Insurance, and reported through self-assessment.

Unlike a partnership, an LLP or a company, there is no separate business entity. Your practice profits simply form part of your total income for the year, alongside anything else you receive such as rental income or investment returns. If you are weighing the structure question, our guide to the differences between an LLP and a traditional partnership sets out the alternatives.

The advantage of the sole trader route is simplicity: you have complete control over your own tax planning and very little filing beyond the annual return. The trade-offs are unlimited personal liability and, once profits become substantial, personal tax rates that can sit above the corporation tax rate a company would pay on retained profit. Whatever structure you adopt, the practice still has to be authorised by the SRA, and the structure decision is therefore a regulatory decision as much as a tax one.

Self-Assessment Requirements

Every sole practitioner solicitor must file an annual self-assessment tax return. The deadline is 31 January following the end of the tax year on 5 April, so the 2024/25 return is due by 31 January 2026 and the 2025/26 return by 31 January 2027.

You report your practice income and expenses on the self-employment pages. The key figures are:

• Turnover, being the total fees billed (including VAT charged if you are VAT-registered, with the VAT then accounted for separately)
• Allowable business expenses
• Capital allowances on equipment and furniture
• Any other business income or one-off items

From the 2024/25 tax year onwards, self-employed profits are taxed on a tax-year basis, meaning your taxable profit is the profit arising in the tax year itself (6 April to 5 April) rather than the profit of an accounting period ending in the year. For most sole practitioners who already draw their accounts to 31 March or 5 April this changes nothing, but if your year end falls elsewhere it is worth understanding how the profit is apportioned. Accurate record-keeping through the year is what makes the return straightforward. Most practices run cloud accounting software that reconciles to the bank automatically, which also positions you for the digital record-keeping that Making Tax Digital will require.

Income Tax and National Insurance

For 2025/26, the sole practitioner solicitor tax calculation uses the following rates.

Income Tax (2025/26):

• Personal allowance: £12,570 (this tapers away once your income passes £100,000, reducing by £1 for every £2 of income, and is fully lost at £125,140)
• Basic rate (20%): £12,571 to £50,270
• Higher rate (40%): £50,271 to £125,140
• Additional rate (45%): above £125,140

National Insurance (2025/26):

• Class 4: 6% on profits between £12,570 and £50,270
• Class 4: 2% on profits above £50,270
• Class 2: no longer a charge. The liability was removed from 6 April 2024. If your profits are at or above the small profits threshold you are treated as having paid Class 2 and keep your state pension entitlement; if your profits are below it, you can pay Class 2 voluntarily to protect that record.

The removal of Class 2 from 6 April 2024 is a common stumbling block, because older guidance still refers to a flat weekly amount (you will still see figures such as a few pounds a week quoted in out-of-date articles). There is no longer any flat weekly Class 2 figure on a sole practitioner's calculation: the only National Insurance you pay on your profits is Class 4, at 6% and then 2%.

To see how the layers stack, take a sole practitioner with £80,000 of profit and no other income. The first £12,570 is covered by the personal allowance. Income tax is charged at 20% on the slice from £12,571 to £50,270, then at 40% on the remaining slice up to £80,000. Class 4 NIC is charged at 6% on profits from £12,570 to £50,270 and at 2% on the £29,730 above £50,270. There is no separate Class 2 charge. The combined marginal cost on profit above £50,270 (40% income tax plus 2% Class 4) is why setting money aside through the year matters so much for a sole trader, and why drifting over a rate threshold late in the year is worth watching.

Payments on Account and Cash Flow

Because nothing is deducted at source, HMRC collects much of your tax in advance through payments on account. Once your liability passes the threshold, you make two instalments, each broadly half of the previous year's income tax and Class 4 NIC:

• 31 January: the balancing payment for the year just filed, plus the first payment on account for the current year
• 31 July: the second payment on account

Any difference between the payments on account and your actual liability is then settled (or refunded) through the balancing payment the following 31 January. In your first profitable year the effect can be sharp, because you can face the balancing payment and the first payment on account together, so the cash demand in that January is larger than a single year's tax. If your profit (and therefore your liability) falls, you can apply to reduce your payments on account, but reduce them too far and HMRC charges interest on the shortfall. Building a tax reserve from each month's drawings smooths this, and reviewing your cash flow around these dates is one of the most useful habits a sole practitioner can adopt.

Making Tax Digital for Income Tax

Making Tax Digital for Income Tax Self Assessment (MTD for ITSA) is being phased in by qualifying income, which is your gross trading income plus any property income. The thresholds are:

• £50,000 from 6 April 2026
• £30,000 from 6 April 2027
• £20,000 from 6 April 2028

Most full-time sole practitioner solicitors have qualifying income above £50,000, so they are in scope from 6 April 2026. Once you are in scope you will need to:

• Keep your business records digitally in compatible software
• Send quarterly updates to HMRC
• Submit a final declaration after the end of the tax year

The quarterly updates replace the rhythm of a single annual return, although the underlying tax position is finalised in the year-end declaration. MTD for ITSA applies to individuals (sole traders and landlords); it does not apply to companies, which fall under corporation tax instead, so incorporating does not bring you into MTD for ITSA (though a company has its own filing obligations). If your practice is VAT-registered you will already be familiar with the digital approach from MTD for VAT, which has applied to VAT-registered firms for some time.

Moving to compatible software well before April 2026 gives you time to settle your digital record-keeping rather than scrambling in the first quarter it bites.

Allowable Expenses for Sole Practitioner Solicitors

Which costs you can set against your practice income has a direct effect on your sole practitioner solicitor tax liability. The governing principle is that an expense must be incurred wholly and exclusively for the purposes of the practice. Our guide to solicitor expense claims goes into each category in more depth.

Core Practice Expenses

• Office rent and rates, whether for separate premises or as a proportion of home working
• Professional indemnity insurance, which every SRA-regulated practice must hold (the premium is allowable and is itself VAT-exempt as insurance)
• SRA practising certificate fees and other regulatory costs
• Legal research subscriptions such as Westlaw or LexisNexis
• Professional development, including CPD courses and training

Equipment and Technology

• Computer equipment and software, including case management systems
• Mobile phones used for the practice
• Office furniture and fixtures
• Stationery and printing

Motor and Travel Expenses

Where you use your car for client meetings, court attendance or other business travel, you can claim either the actual running costs (fuel, insurance, repairs) in proportion to business use, or HMRC's approved mileage rates of 45p per mile for the first 10,000 business miles and 25p per mile thereafter. The distinction that catches people out is that ordinary commuting from home to a regular place of work is not allowable, while travel to court, to a client, or to a conference is.

Home Office Costs

Many sole practitioners work from home, either entirely or part of the week. You can use HMRC's simplified flat rate based on the hours worked at home each month, or calculate the actual proportion of household costs (heating, lighting, council tax, and mortgage interest or rent) attributable to the part of your home used for the practice. The actual-cost method often produces a larger deduction but requires you to keep the underlying records.

Capital Allowances and Equipment

Capital allowances give tax relief on business equipment, furniture and technology. The Annual Investment Allowance (AIA) provides 100% first-year relief on qualifying plant and machinery up to £1 million a year, which covers the great majority of a sole practitioner's purchases. Qualifying items include:

• Computer equipment and servers
• Office furniture and fittings
• Legal libraries and databases
• Practice management software

Where spend exceeds what the AIA absorbs, items fall into the writing-down pools instead. The main-rate writing-down allowance is 18%, reducing to 14% from April 2026, while integral features such as electrical and heating systems sit in the special-rate pool at 6%. Cars sit outside the AIA and follow their own rules, with the rate of allowance depending on CO2 emissions; fully electric cars qualify for a 100% first-year allowance, while higher-emission vehicles attract reduced relief.

VAT Considerations

VAT registration becomes mandatory once your taxable turnover exceeds £90,000 in any rolling 12-month period. Some sole practitioners register voluntarily below that level to recover VAT on their costs. Our VAT registration guide for law firms covers the thresholds and the registration process.

Legal services are standard-rated for VAT at 20%, with no exemption for residential conveyancing. The area that needs care is the treatment of payments you make for clients. A genuine disbursement, such as a court fee or a Land Registry registration fee that you pass through to the client as a pure conduit, can sit outside VAT, but a cost you use as part of your own advice is part of your standard-rated supply. Property search fees are the classic trap: following the Brabners decision, a search fee you interpret and report on in your advice is part of your taxable supply and carries VAT, even though it once might have been treated as a disbursement. Getting this right matters both for VAT and for SRA client-money handling.

Tax Planning Strategies

A few practical levers can reduce a sole practitioner's tax burden without straying into anything contrived.

Pension contributions. Personal pension contributions attract income tax relief and are one of the more effective ways to extract value from a profitable year. The annual allowance is £60,000 for 2025/26, with the ability to carry forward unused allowance from earlier years in some circumstances. Our note on pension contributions and tax relief covers the mechanics.

Timing of income and expenditure. Where you sit close to a rate threshold, the timing of year-end billing or the purchase of qualifying equipment can move profit between tax years and smooth your overall position.

Family involvement. Employing a spouse or civil partner who genuinely works in the practice can use their personal allowance and lower-rate bands, provided the arrangement is real and the pay is commercially justified for the work done.

Incorporation, when the numbers support it. As profits grow beyond what you need to draw, incorporation can become worth modelling. A company pays corporation tax at 19% on profits up to £50,000 and 25% above £250,000, with marginal relief tapering the rate between those points, rather than the personal income tax and Class 4 NIC rates a sole trader pays. Set against that are the loss of the sole trader's simplicity, additional accounts and filing, SRA authorisation as a recognised body, and the dividend tax cost of taking profit out, which increased from 6 April 2026. It is a calculation to run on your own figures rather than a single profit number, and it pairs with your pension and personal cash needs.

Common Compliance Issues

A handful of areas reliably cause problems for sole practitioners.

Client money is not your income. Money held in the client account on behalf of clients must never be treated as practice income; only your fees and the reimbursement of costs you have actually paid are taxable. Keeping the two strictly separate is both a tax point and an SRA compliance requirement.

Disbursement treatment. Payments you make on a client's behalf, such as court fees, are often not taxable income to you, but they have to be classified correctly so they are neither double-counted nor incorrectly relieved, and so the VAT treatment follows.

Work in progress. Unbilled time at the year end may need to be brought into your taxable profit, so the closing position is not simply what you have invoiced.

Mixed personal and business costs. HMRC pays close attention to costs with a possible personal element, such as meals, travel and equipment, so a clear line between personal and practice spending protects your claims.

Record Keeping Requirements

Accurate records underpin both your return and your position if HMRC opens an enquiry. You must keep your business records for at least five years after the 31 January filing deadline for the relevant return. Essential records include:

• All invoices issued to clients
• Receipts for business expenses
• Bank statements for the practice accounts
• Mileage logs supporting motor claims
• Records of anything taken from the business for personal use

Cloud accounting software that connects to your bank and categorises transactions automatically makes this far easier to maintain, and it is the same digital record-keeping that Making Tax Digital will require from April 2026.

Professional Support and Compliance

Given how much a sole practitioner has to manage personally, many work with an accountant who understands the legal sector, particularly around the points where tax and SRA obligations overlap.

Professional support tends to earn its keep around:

• Preparing for Making Tax Digital and selecting compatible software
• Modelling the incorporation decision on real numbers
• Managing cash flow and the payments-on-account cycle
• Handling any HMRC enquiry

The cost of accounting support is itself an allowable business expense, and for most sole practitioners it pays for itself in cleaner compliance and a tax position that is no harder than it needs to be.

If you would like specialist guidance on sole practitioner solicitor tax, consider working with accountants who understand both the tax rules and the SRA requirements that shape how a solicitor's practice is run.