Switching From Cash Basis To Accruals As A Sole Trader
- MAZ
- 12 minutes ago
- 17 min read
Switching From Cash Basis to Accruals as a Sole Trader in 2026
The cash basis was introduced for sole traders and partnerships to simplify self-employed tax reporting, recognising income when received and deducting expenses when paid, without the complexity of matching income and costs to the periods in which they were earned. For many small businesses, it worked well. But the cash basis comes with genuine limitations, and the timing of the 2026 Making Tax Digital for Income Tax rollout has pushed many sole traders to consider whether accruals is the more appropriate method going forward.
There are also scenarios where the switch is effectively forced. If turnover grows beyond the upper eligibility threshold for the cash basis, or if the business changes its legal structure, accruals becomes mandatory. Understanding what the switch involves, and what the tax consequences of the transition are, is not straightforward, and most available guidance skips over the adjustment calculations that determine whether the switch creates a tax hit or a tax advantage in the year it happens.
The Cash Basis: Where It Currently Stands
The cash basis allows self-employed businesses to calculate taxable profits based on money received and paid in the tax year. Income is recognised when received and expenses when paid. This contrasts with accruals, where income is recognised when earned, when the service is delivered or goods sold, and expenses are recognised when the obligation to pay arises, regardless of the cash flow timing.
From the 2024/25 tax year, the cash basis became the default method for all unincorporated businesses, including sole traders and partnerships. Businesses that want to use the accruals method instead must elect out of the cash basis.
This change, making cash basis the default rather than the opt-in, means that sole traders who have never thought about their accounting basis are now using cash basis unless they have actively done otherwise. This has practical consequences: businesses that previously used accruals by default (because they never opted into cash basis under the old rules) will need to confirm their current basis and, if they are now subject to cash basis by default, decide whether to elect out.
For most small businesses with relatively simple income patterns and few timing differences between earning income and receiving cash, the cash basis is entirely adequate. The problems arise at the edges.
Why Sole Traders Switch to Accruals
Several situations make the accruals basis either mandatory or clearly preferable.
The upper limit: From April 2024 when the cash basis became the default, the upper limit for using the cash basis was removed for most businesses. Before that change, there was a £150,000 turnover threshold for the old rules. With the 2024 default change, the upper limit was effectively abolished for most cases. This means most sole traders can remain on cash basis regardless of turnover. However, specific categories of business remain ineligible, and businesses that were previously on accruals and are now subject to the default cash basis should verify their eligibility.
Losses: The cash basis restricts how losses can be used. Under the cash basis, losses cannot be carried back against earlier years' profits or offset against other income, they can only be carried forward against future profits of the same trade. A sole trader who makes a loss in 2025/26 under cash basis cannot offset it against employment income or prior year profits. Under accruals, the loss relief rules are broader, sideways relief against other income and carry-back options are available. For a business experiencing a loss year, especially one entering self-employment from employment with some residual income, accruals may unlock tax relief that cash basis would deny.
Finance costs and complex arrangements: The cash basis has restrictions on interest deductions. Under cash basis, the deduction for loan interest and finance charges is capped at £500 per year. For businesses with meaningful borrowing, working capital loans, asset finance, or any commercial borrowing above modest levels, this cap can result in an understatement of genuine business costs. Accruals applies the full deduction.
Making Tax Digital: From 6 April 2026, MTD for Income Tax applies to sole traders and landlords with gross income above £50,000. The quarterly reporting obligations under MTD do not mandate accruals, but the process of preparing quarterly submissions on a cash basis is complicated where debtors, creditors, and work-in-progress are significant. Many sole traders transitioning to MTD find accruals produces a more coherent quarterly picture.
The Election Mechanism: How to Switch
Switching from cash basis to accruals requires an election out of the cash basis. Under the new default cash basis rules, a business that wishes to use the accruals method must elect out of the cash basis. The election is made on the Self Assessment tax return for the tax year in which the change takes effect.
The election applies from the start of the tax year in which it is made. It cannot be made partway through a tax year. A sole trader who decides in November 2026 that they want to switch to accruals from the next tax year makes the election on their 2027/28 Self Assessment return, covering the tax year starting 6 April 2027.
The election applies going forward until the business either elects back into cash basis or ceases trading.
The Transition Year: The Critical Adjustment Calculation
This is where most sole traders who attempt to manage the switch themselves encounter difficulty. Switching from cash basis to accruals is not simply changing the accounting method — it generates a transitional adjustment that can either increase or decrease taxable profits in the year of switch.
The adjustment arises because accruals requires the inclusion of debtors (amounts owed to the business but not yet received) and the deduction of creditors (amounts owed by the business but not yet paid), neither of which existed in the cash basis records. On the other side, any outstanding debtors and creditors at the end of the last cash basis year must be brought into account.
When a business switches from cash basis to accruals, adjustments must be made to account for the difference in profit calculations between the two methods. Specifically, income that has been earned but not yet received, debtors, must be brought into the first accruals-basis tax year as income. Expenses that have been incurred but not yet paid, creditors, must be brought in as deductions.
Worked example of the transitional adjustment:
A freelance designer switches from cash basis to accruals for 2026/27. At 5 April 2026 (end of last cash basis year), their position is:
● Trade debtors (invoices raised but not yet paid by clients): £14,000
● Prepaid expenses (insurance paid in advance covering 2026/27): £1,200
● Accrued expenses (accountant's fee for 2025/26 not yet invoiced): £800
● Trade creditors (outstanding supplier invoices): £3,500
The transitional adjustment for 2026/27 adds:
● Trade debtors: +£14,000 (income earned in 2025/26 but received in 2026/27)
● Prepaid expenses: +£1,200 (expense already paid in 2025/26 relating to 2026/27)
And deducts:
● Creditors: -£3,500 (expenses incurred in 2025/26 but paid in 2026/27)
● Accrued expenses: -£800 (already counted in 2025/26 under accruals logic)
Net transitional adjustment: +£10,900 additional taxable income in the first accruals year.
For this designer, the switch creates a one-off taxable income spike of £10,900 in 2026/27, purely a timing effect, not real new income, but real new tax. At a 40% income tax rate, this is a £4,360 additional tax bill arising purely from the accounting change.
Spreading the Transitional Adjustment
If the transitional adjustment produces a net additional amount of income, this can be spread evenly over a period of six years rather than being taxed entirely in the year of the switch.
This spreading provision significantly reduces the cash-flow impact of switching. In the example above, the £10,900 adjustment could be spread as approximately £1,817 per year over six years, reducing the annual additional tax from £4,360 to approximately £727 per year at 40%.
The spread applies automatically to positive adjustments (i.e., where the switch generates additional income). The taxpayer must claim the spreading, it does not apply automatically, and the claim is made on the Self Assessment return for the year of the switch.
A negative transitional adjustment, where the switch reduces taxable income, is typically brought in in full in the year of the switch as a deduction. This is the more favourable outcome and arises where the business has more outstanding creditors and accrued expenses than trade debtors at the transition date.
Opening Balances: Building the Accruals Records
When a sole trader switches to accruals, the first task after the transition adjustment is establishing the correct opening balance sheet figures from which the first full accruals year will run. This is where record-keeping during the cash basis period pays dividends.
The opening balance sheet needs to capture:
Trade debtors: All outstanding invoices raised by the business but not yet paid as at the end of the last cash basis tax year (5 April). These should be listed individually, client name, invoice date, amount, from the invoicing records.
Trade creditors: All outstanding supplier invoices received but not yet paid. Again, these should be documented individually with supplier details and invoice dates.
Prepayments: Expenses already paid in the final cash basis year that relate to the following year — advance insurance premiums, subscription renewals, prepaid rent. These are expenses that have been paid but not yet incurred for accounting purposes.
Accruals: Expenses incurred in the final cash basis year but not yet invoiced or paid, the accountant's fee for preparing the final cash basis return is a common example, as are utility charges where bills are received quarterly.
Work-in-progress: For businesses that carry significant uncompleted work, a consultant with a partially delivered project, a tradesperson with a job in progress, the WIP calculation determines how much revenue and cost relates to the period, regardless of when invoiced. This is typically the most complex element of establishing accruals for a service business.
Stock: If the business holds physical stock for sale, that stock must be valued at cost or net realisable value, whichever is lower, at the transition date. Cash basis records may not have captured stock movements in a way that makes this easy to establish.
Capital Allowances: What Changes and What Does Not
Capital allowances, AIA, writing-down allowances, and first-year allowances — operate in the same way under both cash basis and accruals for most expenditure. The switch in accounting basis does not create an additional capital allowances adjustment.
However, there is a specific difference. Under the cash basis, the simplified cash basis rules allowed certain business assets to be treated as immediate deductions (under cash basis) rather than going through the capital allowances system. Under the cash basis, motor vehicles could be claimed using flat-rate mileage allowances rather than through capital allowances. When switching to accruals, a business that has been using mileage allowances must decide whether to continue doing so or to switch to capital allowances for the vehicle.
A sole trader who has been claiming 45p per mile for their van under cash basis can continue using the mileage rate under accruals if they choose, the mileage rates themselves are not restricted to cash basis. However, if they switch to claiming actual costs and capital allowances for the vehicle, they need to establish the vehicle's cost and any prior capital allowance history. A van that was used under mileage rates with no capital allowances claim has a nil TWDV (tax written-down value) in a capital allowances pool, there is nothing to carry over. Starting capital allowances treatment from the transition date would require establishing the current market value of the vehicle and entering it into the pool at that value.
For businesses with significant capital assets, reviewing the capital allowances position at transition is important to ensure the most beneficial treatment is adopted going forward.
Work-in-Progress and Service Businesses
Work-in-progress accounting is the element of the transition that most frequently causes sole traders in professional services and trades to underestimate the complexity of switching.
Under accruals, income is recognised when earned, and for a service business, this typically means when the service has been delivered or, for long-running engagements, proportionately as work progresses. A consultant who has spent two months on a three-month project at the transition date has earned approximately two-thirds of the contract value. That two-thirds should be included in income for the transition period, even if the invoice has not been raised.
For tradespeople, WIP represents the cost of labour and materials on jobs that are started but not yet complete and invoiced. The WIP is an asset, work done that will be invoiced in future, and it is brought onto the opening balance sheet at cost.
Getting WIP right requires being able to identify, at the transition date, which jobs or projects were in progress, what had been done, what remained outstanding, and what the cost of work done to date was. For businesses that track job costs rigorously, this is manageable. For those that have simply logged cash in and out, reconstructing WIP at transition can be a significant exercise.
The MTD for Income Tax Interaction
From April 2026, the first cohort of sole traders is subject to MTD for Income Tax, those with gross income above £50,000. The quarterly reporting obligation requires a summary of income and expenses to be submitted to HMRC four times per year, with an annual finalisation.
HMRC has confirmed that both cash basis and accruals are compatible with MTD quarterly reporting. There is no requirement to switch to accruals simply because MTD applies. However, the practical experience of preparing quarterly reports under accruals is often more representative of the business's actual financial position than cash basis, particularly for businesses with significant timing differences between earning income and receiving cash.
For a consultant billing long-running projects, a cash basis quarterly submission might show zero income in months when nothing was received, followed by large spikes in months when invoices were paid. An accruals submission would show more evenly distributed income reflecting work done each quarter. From a planning and cashflow management perspective, the accruals picture is often more useful.
The transition to MTD is a logical trigger point for reviewing accounting basis, it requires updating record-keeping systems anyway, and ensuring those systems are accruals-compatible at that point is less disruptive than switching later.
Practical Planning Steps for 2026/27
For a sole trader considering switching to accruals for 2026/27, either because of MTD, growth, or a desire for broader loss relief options,the following sequence covers the key decisions:
Step 1 — Verify current basis. Confirm that the business is currently on cash basis under the 2024 default rules, or on accruals following an existing election out. The basis used for 2025/26 determines the transition starting point.
Step 2 — List debtors, creditors, prepayments, and accruals at 5 April 2026. These are the inputs to the transitional adjustment calculation. The exercise does not need to be complex, but it must be complete and accurate, missing a significant debtor understates the transition adjustment and creates a compliance risk.
Step 3 — Calculate the transitional adjustment. Net debtors and prepayments (positive) against creditors and accruals (negative). If the result is positive, consider the six-year spreading provision. If negative, the full deduction is available in 2026/27.
Step 4 — Establish opening capital position. Review whether vehicles are being claimed under mileage rates or capital allowances, and whether any mid-year switch to capital allowances is appropriate.
Step 5 — Elect out of cash basis on the 2026/27 Self Assessment return. The election is confirmed by completing the return on an accruals basis and ensuring the self-employment pages reflect the accruals treatment from April 2026.
Step 6 — Update bookkeeping systems. Ensure the record-keeping platform used for MTD or manual accounts correctly reflects accruals treatment from the start of the new tax year.
Key Takeaways
● From 2024/25, the cash basis is the default for unincorporated businesses. Sole traders who want to use accruals must elect out of the cash basis on their Self Assessment return.
● The transition from cash basis to accruals generates an adjustment in the year of switch, adding debtors and prepayments to income while deducting outstanding creditors and accruals. This can create a one-off taxable income increase.
● A positive transitional adjustment can be spread over six years to reduce the immediate tax impact. The spreading must be claimed, it is not automatic.
● Cash basis restricts loss relief to carry-forward only. Accruals provides access to sideways loss relief against other income and carry-back, which can be more valuable for some businesses.
● Under cash basis, the finance cost deduction is capped at £500 per year. Accruals removes this cap, making it essential for businesses with meaningful borrowing.
● Capital allowances are broadly unaffected by the basis switch, but the treatment of vehicles, mileage rates versus capital allowances should be reviewed at transition.
● The 2026 MTD rollout is a practical trigger point for reviewing accounting basis. Both methods work with MTD, but accruals often produces more representative quarterly figures for service businesses.
FAQs
Q1: If a sole trader switches from cash basis to accruals mid-way through their self-employment career, does this affect how their earlier years' tax returns are treated?
A1: Well, it is worth noting that the switch to accruals is entirely prospective , it does not reopen or alter the tax treatment of earlier years prepared under the cash basis. Prior years stand as filed, and there is no need to recalculate historical profits using the accruals method. The transition adjustment in the year of switching accounts for the timing differences between the two methods, ensuring that income and expenses are not either double-counted or missed.
The adjustment is essentially a bridge between the two systems, and once completed correctly, the accruals basis runs forward cleanly from the switch year. Historical returns prepared under cash basis are not amended, queried, or reconsidered as a result of switching. This is an important reassurance for sole traders who worry that switching somehow implies their prior-year returns were incorrect , they were not. They were prepared on the correct basis for those years, and the transition adjustment handles the remainder.
Q2: Can a sole trader switch from accruals back to cash basis after switching to accruals, and how many times can this be done?
A2: In my experience, this question comes up when a business has switched to accruals under pressure , perhaps to comply with a lender's requirement or for an MTD transition , and then finds the administrative complexity is not worth it for their particular trade. The position is that a business can switch between cash basis and accruals, but not in the same tax year as a previous switch. Repeated switching back and forth is permitted in principle, though HMRC expects the choice to reflect the genuine needs of the business rather than a strategy to manipulate taxable profits in specific years. A sole trader who switches to accruals in 2026/27 and then elects back into cash basis in 2027/28 is doing so in the immediately following year , which HMRC would scrutinise carefully if it produced a convenient tax saving.
The reverse transition , from accruals to cash basis , also generates a transitional adjustment, and that adjustment works in the opposite direction: debtors that were included in accruals income are deducted to avoid double-counting when cash is received. Switching back to cash basis is a legitimate option, but it should be driven by genuine business needs rather than an attempt to time tax liabilities.
Q3: How does the accruals basis affect a sole trader who regularly receives large upfront retainers or advance payments from clients?
A3: Well, this is one of the scenarios where the accruals basis can actually produce a worse immediate tax outcome than cash basis, and it is worth understanding clearly. Under cash basis, income is recognised when received , so a large retainer paid upfront goes into income in the month it lands in the bank. Under accruals, a retainer received in advance of work being performed is deferred income , it is recognised only as the work is delivered. A sole trader who receives a £24,000 annual retainer in April might include the full £24,000 as April income under cash basis, but under accruals would spread £2,000 per month across the year as services are delivered.
For businesses with steady monthly retainer arrangements, the difference between cash basis and accruals is minimal over the long run , it only affects timing. But for businesses where retainers are uneven or where a large advance sits unpaid at the transition date, the switch can defer income recognition and actually improve the transition year position. Conversely, if significant retainers were received and largely unearned at the transition from cash basis, the deferred income adjustment can create a deduction in the transition year.
Q4: If a sole trader is also a PAYE employee in addition to their self-employment, does switching to accruals affect their income tax or National Insurance position in any way?
A4: Well, the switch to accruals affects only how self-employment profits are calculated for tax purposes , it has no direct effect on the PAYE income or the National Insurance collected through that employment. Both income streams feed into the same Self Assessment return, and the final tax liability is calculated on total income from all sources. However, there is an indirect effect worth understanding. The transitional adjustment in the year of switching can increase or decrease self-employment profits in that year. If the adjustment increases profits significantly , because the business had substantial debtors at the transition date , it pushes total income higher, which could affect the personal allowance taper above £100,000, Child Benefit charge calculations, or the amount of pension relief available.
Conversely, a negative transitional adjustment reduces profits, potentially improving the overall position in ways that extend beyond the self-employment calculation. The interaction with the PAYE income means the transitional year needs to be modelled with both income streams in mind, not just the self-employment in isolation. This is particularly important for sole traders who also have significant dividend income or rental income alongside their PAYE earnings.
Q5: Does switching from cash basis to accruals affect how a sole trader records and claims expenses for travel or working from home?
A5: In my experience, many sole traders worry unnecessarily about this particular aspect of the switch. The method of claiming travel and home working expenses does not fundamentally change between cash basis and accruals. Under both methods, the business can choose between actual costs and HMRC's flat-rate simplified expenses. What accruals does change is the timing of when expenses are recognised. Under cash basis, a fuel bill paid in one month is expensed that month. Under accruals, expenses are matched to the period they relate to , so if a fuel charge relating to March work is not settled until April, the expense still belongs in March under accruals. For most day-to-day expenses, this timing difference is immaterial.
Where it matters is with larger annual costs , insurance premiums, professional subscriptions, or software licences paid annually , which under accruals need to be apportioned between periods. A business that pays its annual professional indemnity insurance in advance in February for the following year would spread that cost over twelve months under accruals, rather than recognising it fully in February as cash basis would. The key adjustment is not in the nature of what can be claimed, but in when costs are recognised within the accounting year.
Q6: How should a sole trader who holds physical stock , such as a craft seller or small retailer , handle the stock valuation when switching to accruals?
A6: Well, this is genuinely one of the more practically challenging aspects of the switch for product-based businesses, and it is an area where many sole traders underestimate the work involved. Under the cash basis, payments for stock are simply recorded when made , there is no separate stock asset on the balance sheet. When switching to accruals, the stock held at the transition date must be valued and brought onto the opening accruals balance sheet. The valuation standard for stock under accruals is the lower of cost and net realisable value. Cost means what was paid to acquire or produce the stock. Net realisable value is the expected selling price less any costs to complete and sell. A craft seller with materials worth £3,000 at cost that she expects to sell for £8,000 would value the stock at £3,000 , the lower figure.
The stock valuation at transition affects the transitional adjustment: stock that was purchased and expensed under cash basis in a prior period but remains unsold at the transition date is effectively brought back into the calculation as an asset. This increases the opening balance sheet value but reduces the cost of sales in the first accruals year, because those stock costs have already been counted. Getting the stock count right at the transition date , ideally on 5 April in the final cash basis year , is essential to avoid either double-counting or missing costs in the switch year.
Q7: What happens to a sole trader's tax position if they switch to accruals in the same year that they also start claiming the higher mileage rates for electric vehicles?
A7: Well, this is an interesting combination that a growing number of self-employed drivers are navigating simultaneously. The switch to accruals and the choice between mileage rates and actual vehicle costs are separate decisions, but they interact in the first year. Under both cash basis and accruals, a sole trader can use HMRC's approved mileage rates , 45p per mile for the first 10,000 business miles, 25p thereafter , instead of claiming actual fuel and vehicle costs. Switching to accruals does not force a change from mileage rates to actual costs. A sole trader can continue using mileage rates under accruals, and many do , it is simpler and avoids the need to track fuel costs and calculate a capital allowances claim for the vehicle.
Where a sole trader wants to switch from mileage rates to actual costs at the same time as switching to accruals, the vehicle cost must be established and entered into the capital allowances pool. If the vehicle has been used under mileage rates, there is no prior capital allowances history and no tax written-down value , the switch to actual costs starts fresh with the current market value of the vehicle. This is particularly relevant for electric vehicle owners who may find the mileage rates less attractive given lower running costs, and who want to claim the full cost through capital allowances instead.
About the Author
Maz Zaheer, AFA, MAAT, MBA, is the CEO and Chief Accountant of MTA and Total Tax Accountants, (Registered with Companies House) two premier UK tax advisory firms. With over 15 years of expertise in UK taxation, Maz provides authoritative guidance to individuals, SMEs, and corporations on complex tax issues. As a Tax Accountant and an accomplished tax writer, he is renowned for breaking down intricate tax concepts into clear, accessible content. His insights equip UK taxpayers with the knowledge and confidence to manage their financial obligations effectively.
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