Dental partnership accounting and pension tax planning using the cash basis
Cash basis pension tapering for dentists is an increasingly common issue, particularly where one‑off profit spikes push adjusted income above the Annual Allowance thresholds
This example shows how cash basis pension tapering for dentists is driven by timing, accounting method, and NHS clawback treatment.
Introduction
We were recently introduced to a dental partnership by a financial adviser after the dentists became concerned that they had been hit with an unexpected tax charge on their pension contributions.
Their concern was simple but serious:
“We’ve been told we owe additional tax on our pension — could this have been avoided?”
To answer that question, I reviewed the partnership accounts together with my colleague Katherine Flood, to understand what had caused the issue and whether better planning could have prevented it.
Table of Contents
The problem: pension tapering after a spike in partnership profits
Each of the partners in this dental partnership had exceeded £260,000 of income, which triggered the pension annual allowance taper.
This meant:
- their standard £60,000 pension allowance was reduced, and
- they suffered an annual allowance tax charge at their marginal rate of 45%.
What made this particularly frustrating was that the increase in income was driven by a one‑off spike in partnership profits, rather than a permanent increase in underlying cash earnings.
This raised an important question:
Was this tax charge unavoidable — or was it caused by how the accounts were prepared?
What stood out in the accounts
The key issue became clear very quickly:
the partnership accounts had been prepared on the accruals basis.
There’s nothing inherently wrong with accruals accounting. However, for dentists — particularly those with fluctuating income — it’s always worth asking:
Is the accruals basis still the most suitable method?
Since 2024, the cash basis has effectively become the default accounting method for most unincorporated businesses, and dental partnerships are often particularly well suited to it.
Reworking the figures using the cash basis
To understand whether the pension tax charge could have been avoided, we reworked the figures using the cash basis of accounting.
Unlike traditional accruals accounting, the cash basis removes timing differences and focuses purely on money actually received and paid during the year. This can have a significant impact on taxable profits in practices.
We adjusted for the most typical timing items:
- £60,000 trade debtors – income recognised under accruals for dental work undertaken but not yet received in cash
- £1,000 trade creditors – costs of suppliers included under accruals but not yet paid
- £8,500 stock – cash paid for materials not yet consumed
- £5,000 prepayments – expenses paid in advance relating to a future period such as an annual insurance premium
- £4,000 accruals – expenses recognised before payment such as a accounting fees paid for the finanical year after the financial year end
The timing effect on profit
When moving from accruals to the cash basis, each of these items has a one‑off timing effect on profit in the transition year:
- Removing trade debtors reduces taxable income
- Removing stock and prepayments brings forward cash costs
- Adding back creditors and accruals reverses expenses not yet paid
The net effect was a reduction in taxable profit of approximately £68,500, calculated as follows:
Trade debtors – £60,000
Stock – £8,500
Prepayments – £5,000
Trade creditors + £1,000
Accruals + £4,000
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Net reduction in profit – £68,500
Although we didn’t have access to the previous accountant’s full working papers, we were confident that the direction and scale of the adjustment were correct.
How NHS clawback can reverse the benefit
In the example above, switching to the cash basis reduced taxable profits by approximately £68,500, based purely on normal timing differences such as debtors, stock and prepayments.
However, this reduced‑profit outcome only holds if NHS clawback timing is aligned correctly.
Now lets assume instead that the dental practice is NHS only or NHS mixed with private dentistry: and
- There is a NHS clawback of £200,000 accrued as income to be repaid and was deducted from profits under accruals accounting; and
- The clawback had not yet been physically repaid during the year we are re‑working.
The combined effect would be:
Cash‑basis timing adjustments – £68,500
Add back accrued NHS clawback + £200,000
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Net increase in taxable profit + £131,500
Instead of reducing profits, the switch to the cash basis would have increased taxable income by approximately £131,500 for that year.
The cash basis can reduce taxable profits — or increase them — depending entirely on when NHS clawback is accrued versus when it is paid. Always model both together before drawing pension planning conclusions.
⚠️ Cash basis warning
Why this matters for pension tapering
Both outcomes represent timing differences, not tax avoidance. Over time, total taxable income remains broadly unchanged.
However, for pension tapering, the year in which income is taxed is critical.
- In some cases, the cash basis can reduce adjusted income and avoid an Annual Allowance charge
- In others, unaligned clawback timing can increase adjusted income and trigger one unexpectedly
The result depends on the underlying facts.
Cash‑basis planning for dentists must always consider NHS income cycles, clawback timing, and pension thresholds together.
The outcome: a significant tax saving
In our case the cash basis made the partnership’s taxable profits £68,500 lower.
Crucially, this would likely have kept each partner’s income below the £260,000 pension taper threshold, meaning:
- ✅ the pension taper would not have applied, and
- ✅ each dentist could have avoided a pension tax charge of close to £8,000.
This appears to have been an entirely avoidable tax charge, caused not by the pension advice given, but by the choice of accounting basis used in preparing the accounts.
The good news: it’s often not too late
In many cases, situations like this are still fixable.
There is often time to:
- reassess whether the cash basis is more appropriate, and
- amend accounts and tax returns where permitted.
With the right advice and timely action, adverse pension tax outcomes can sometimes be reduced or eliminated altogether.
The wider lesson for dentists
This case highlights an important point:
Good tax planning isn’t always about complex schemes — sometimes it’s about asking the right question at the right time.
For dentists, those questions often include asking their accountant:
- Does the current accruals basis still make sense?
- Could accruals accounting be pushing income into a year where it causes pension tapering or other tax issues?
For many dental practice partnerships, the cash basis can be a simple but powerful planning tool when used correctly.
FAQs
How do I know if I’m using the cash basis or accruals basis?
Check your accounts or tax return notes. They will usually state whether they are prepared on the cash basis or accruals basis.
What’s the quickest way to tell from my accounts?
If your accounts include trade debtors, trade creditors, stock, prepayments, or accruals, you are almost certainly using the accruals basis.
What does cash basis accounting mean in simple terms?
Under the cash basis, you are taxed when money actually goes in or out of your bank account, not when income is earned or expenses are incurred.
What does accruals basis accounting mean?
Under the accruals basis, you are taxed on income when it is earned, even if you haven’t been paid yet, and expenses are deducted when they are incurred, not paid.
Why does this matter for dentists?
For dentists, the accounting basis can significantly affect taxable income, pension annual allowance tapering, and unexpected tax charges, especially in years with fluctuating profits.
When should a dentist review their accounting basis?
You should review your accounting basis if:
- your income is near or above £260,000
- you’ve suffered pension tapering
- profits fluctuate year‑to‑year
- you’ve had a one‑off spike in income
✅ Call to Action
Are you a dentist worried about pension tax or high income?
If you:
- have seen a spike in profits,
- have been hit with a pension annual allowance charge, or
- want to check whether the cash basis could reduce your tax bill,
we’d be happy to review your position.
👉 Get in touch for a no‑obligation review of your accounts and pension position.
For financial advisers
If you work with dentists and want an accountant who understands pension tapering, cash basis planning, and dental partnerships, we’re always happy to collaborate.
👉 Contact us to discuss how we can support your dental clients.
