Superannuation guarantee for contractor doctors

The most expensive superannuation mistake a medical practice makes is assuming a doctor with an ABN sits outside the super system. Usually they don't. Superannuation guarantee runs on its own test, separate from how the ATO treats the same person for income tax, and a large share of contractor practitioner arrangements in Australian medical practices meet it.

An ABN doesn't decide it; the contract does

Section 12(3) of the Superannuation Guarantee (Administration) Act 1992 treats a person working under a contract that is wholly or principally for their personal labour as an employee for superannuation purposes, whether or not they hold an ABN. A GP engaged under a service arrangement, working set sessions, using the practice's rooms, equipment, reception and billing system, and seeing the practice's patients is very likely an employee for super purposes whatever the contract calls them.

The question is not what the contract says the parties are. It is what the arrangement actually looks like: whose patients, whose equipment, whose hours, and whether the practitioner is running a business on their own account or supplying labour into someone else's.

Only the labour component counts

Where super does apply to a contractor, it is calculated on the labour portion of the contract, not the whole amount invoiced. If the agreement bundles rooms, equipment, nursing support and billing services into one figure, only the part that is payment for personal work counts as ordinary time earnings. A practice that runs super across an entire facility fee, rather than the labour share of it, is very likely overpaying.

Where the agreement separately identifies the components, use those figures. Where it doesn't, a defensible apportionment is needed, and it is worth settling with an accountant before a review settles it for you.

The delegation right the ATO actually looks at

The ATO's ruling on section 12(3), TR 2023/4, gives weight to one factor that practices often overlook: a genuine, unrestricted contractual right to send another qualified practitioner in the contractor's place. Where that right is real and actually used, such as locum cover between physiotherapists or podiatrists, it carries significant weight against employee status. Where it exists only on paper and is never exercised, it does no work at all; the right has to be exercisable, not decorative.

This is also why a mobile arrangement is not automatically safe. A practitioner who visits several sites but works exclusively for one clinic, using that clinic's equipment and following its scheduling and pricing, has not escaped section 12(3) by travelling between rooms. The factors that matter are the same wherever the work happens: whose equipment, whose diary, whose patients, and who carries the commercial risk if a booking falls through.

The contribution base cap

Super is only required on ordinary time earnings up to the maximum contribution base. For 2026-27 the cap is $270,830 a year, now an annual figure rather than a quarterly one, because Payday Super replaced the quarterly cycle from 1 July 2026 and the cap moved with it. Earnings above the cap attract no super, which for a high-earning practitioner is the difference between a correct calculation and a significant overpayment.

The cap fell in the two years before that: $65,070 a quarter in 2024-25 and $62,500 a quarter in 2025-26. That is not a cut to anyone's super. The cap is set so the super rate multiplied by it equals the concessional contributions cap, so when the rate rose from 11.5% to 12% on 1 July 2025, the base had to fall to hold the contributions ceiling steady.

Payday Super changes the timing, not the amount

From 1 July 2026, super must be paid at the same time as the wages it relates to, rather than quarterly. For a practice that has always funded super quarterly, that is a cash-flow change rather than a cost change: the same amount leaves the business, sooner and in smaller instalments.

The compliance consequence is larger than the cash-flow one. A quarterly cycle gave a practice a window to catch and correct a missed payment before the deadline; payday timing removes that window, so an error in a single pay run becomes a late contribution almost immediately, and the super guarantee charge, which applies to late contributions, is calculated on the shortfall plus interest and an administration fee, none of it deductible.

What this means across professions

The same test produces the same answer whatever the discipline. A dental associate paid a percentage of billings with no separately identified equipment charge, a physiotherapist on a sessional rate using the clinic's plinths, a psychologist on a fee split seeing clients in the practice's rooms, and a podiatrist paid per consultation on the clinic's equipment, and an optometrist paid a day rate testing patients on the practice's own equipment are all very likely employees for super purposes, regardless of the ABN each of them holds. What changes the answer is not the profession; it is whether the practitioner supplies genuinely independent equipment, sets their own diary, and carries their own commercial risk.

What to do next

For a specific contractor arrangement, work through the Superannuation Guarantee calculator to see the labour component, the contribution base cap and the shortfall if super has been underpaid. It includes worked examples across dental, physiotherapy, psychology and podiatry arrangements. This guide and that calculator are explanatory and estimation tools, not a substitute for advice on your specific contract. Where a contractor cohort is large enough that the answer represents real money, get the classification reviewed by an accountant before a retrospective assessment does it for you.