Your monthly pay statement shows gross fees, lab and materials deducted by the practice, and superannuation. Read it every month, checking three things: that your percentage matches your agreement, that lab charges look right, and that superannuation is being deducted on a sensible estimate of your pensionable earnings. Five minutes a month prevents the classic year-three discovery that something has been wrong since day one.
One point of language matters for the rest of your career: your income is the gross fee figure, and the practice's deductions are your expenses. The amount that lands in your bank is neither. Every tax figure below is built on the gross number.
Take an illustrative associate who starts on 1 September 2026 on gross earnings of £5,500 a month. Seven months fall inside the 2026/27 tax year, which ends on 5 April 2027.
Against the 2026/27 rates, the personal allowance is £12,570 and the basic rate is 20% up to £50,270, so income tax is (£33,800 − £12,570) × 20% = £4,246. Class 4 National Insurance is 6% on profits between £12,570 and £50,270, so £21,230 × 6% = £1,273.80. The bill for the year is £5,519.80.
Now the part that catches people. That bill is due on 31 January 2028 — sixteen months after starting. Because it exceeds £1,000 and almost none of it was collected at source, it also triggers payments on account: half the bill again on the same date, and half the following July. So:
That January demand is 1.5 times the tax the year actually generated, and it is entirely predictable from the day you start. Superannuation is not in it — that has already been deducted at source, month by month, and is a separate matter from your tax bill.
Run the January 2028 figure back over the earnings that produced it: £8,279.70 against £38,500 of gross earnings is 21.5%. Now check it against a full year. The same associate in 2027/28, working twelve months at £5,500, grosses £66,000; after roughly £8,000 of practice deductions and own costs the profit is about £58,000. Income tax is £7,540 in the basic rate plus £3,092 at 40% on the slice above £50,270, and Class 4 is £2,262 plus £154.60 at 2% above the upper threshold — £13,048.60 in total, or 19.8% of gross.
The associates who suffer are not the ones who earn less. They are the ones who treated gross pay as spendable for sixteen months. The wider mechanics of self-employed dental tax are in our associate tax guide, and the costs you can legitimately claim are in the expenses guide — worth reading before your first return, because a first-year claim sets the pattern for every year after it.
NHS pension contributions come out of your NHS earnings before you see them, at a rate set by your pensionable pay. From 1 April 2026 the member tiers are 5.2% up to £13,259, 6.5% to £28,854, 8.3% to £35,155, 9.8% to £52,778, 10.7% to £67,668, and 12.5% above that. Your employer contributes 23.7% on top — which is the clearest measure of what the scheme is worth and why opting out is almost always the wrong instinct.
The first-year trap is annualisation. For dental practitioners the contribution tier is set by reference to pensionable pay grossed up to a full year, not the part-year you actually worked. A seven-month first year can therefore be tiered as though you had earned at that rate for twelve months, putting you in a higher band than your actual earnings suggest. Check the tier on your statements rather than assuming, and see the NHS pension guide for how the deductions are estimated in-year and reconciled afterwards.
Quarterly digital reporting applies to sole traders by reference to qualifying income — gross turnover from self-employment and property, before expenses. Our illustrative associate grossed £38,500 in 2026/27. That is under the £30,000 threshold test for April 2027 only because they had no self-employment in 2025/26 — but it is comfortably over the £20,000 threshold that applies from 6 April 2028 and is measured against the 2026/27 return. In other words, your third year as an associate is when quarterly updates start. Set your bookkeeping up digitally now and that date is a non-event; leave it and you will be migrating records under deadline pressure. The full timetable is in our MTD guide for dentists.
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Later than you expect and larger than you expect. An associate starting in September 2026 falls into the 2026/27 tax year, which ends 5 April 2027, with the bill due 31 January 2028 — sixteen months after starting. On seven months at £5,500 gross, after practice deductions and own costs, taxable profit of around £33,800 produces £4,246 of income tax and £1,273.80 of Class 4 National Insurance. Because that exceeds £1,000, payments on account are added: half again on 31 January 2028 and half on 31 July 2028. The January demand is therefore about £8,280, not £5,520.
Twenty-five per cent of gross, moved into a separate account on the day each payment lands. That figure is not a guess: the first-year January demand in the worked example above comes to 21.5% of the gross earnings that produced it, and a full year at £66,000 gross with higher-rate tax on the top slice comes to 19.8%. Twenty-five per cent covers both with a margin for a strong year. Move to 30% once you are consistently in the 40% band or your private income is growing. Superannuation is separate — it has already been deducted before you were paid.
Usually not, but check if your first period was short. Class 2 is no longer charged to self-employed people with profits above the small profits threshold, which is £7,105 for 2026/27 — you are treated as having paid it and your National Insurance record is credited automatically. If you started late in the tax year and your profits for that stub period came in below £7,105, you can pay Class 2 voluntarily at £3.65 a week for 2026/27 to keep the year qualifying for the state pension. It is a small sum to protect a full contribution year.
Usually not in year one, and especially not with predominantly NHS income. NHS earnings routed through a company generally cannot be superannuated, so you give up growth in a scheme where your employer contributes 23.7% of pensionable pay on top of your own contributions. At typical first-year profits the tax saving does not come close to covering that, before you add company accounts, corporation tax filings, payroll and dividend paperwork. Get established, watch how your private income develops, then model it properly rather than acting on an advert aimed at newly qualified dentists.
Professional indemnity is compulsory and non-negotiable. After that, income protection matters most and is bought least: you are self-employed now, so if illness or injury stops you working there is no employer sick pay and no NHS salary behind you. Look at the deferred period and whether the policy pays on your own occupation as a dentist rather than on any occupation, because that distinction decides whether it pays out for a hand injury. Life cover and critical illness depend on whether anyone depends on your income, which for many new associates is not yet the case.
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