The Fine Print Australia · PUBLISHED 26 JUN 2026 · VERIFIED 26 JUN 2026 · AU EDITION

Going Self-Employed? Do You Know the Tax and Super Rules? 🇦🇺

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A new sole trader earning $90,000 who forgets to set aside tax can owe over $23,000 in one lump sum at their first tax return once income tax, Medicare levy and HECS are added, with no employer PAYG withholding to soften the blow.

The number that matters

12% — super guarantee (SG) rate — ATO, 2025–26

From 1 July 2025, employers must pay 12% of an employee’s ordinary time earnings into super, but self‑employed people are not required to pay any SG for themselves, creating a 12% annual retirement savings gap unless they act voluntarily.

How it quietly costs you

Mechanism: No automatic tax withholding for self‑employed income

• Employees have tax withheld from each pay under PAYG (Pay As You Go) withholding, but sole traders and many new company owners are paid gross, with no tax automatically withheld.
• The ATO expects self‑employed people to register for PAYG instalments or voluntarily pay tax during the year; if they do not, the entire year’s tax bill is due at once after lodging their return.

What catches new business owners off guard

• A new sole trader who invoices $90,000 and spends most of it as “take‑home pay” often assumes tax will “work itself out at tax time”, not realising they should have set aside 25–30% for tax and Medicare levy.
• There is no $450‑per‑month threshold anymore for employer SG; but that protection does nothing for self‑employed people who pay themselves from business profits, as they are excluded from mandatory SG and PAYG withholding.

Quantified impact — first‑year tax shock

Illustrative example (using ATO individual tax rates and Medicare levy, 2025–26):

• Assessable income as sole trader: $90,000
• Approx. income tax (using current individual rates, excluding offsets): about $20,000–$21,000 (modelled from ATO schedules)
• Medicare levy at 2% on $90,000: $1,800 (using current standard rate)
• Total bill at first tax return: ≈$21,800–$22,800

Because no PAYG withholding occurred during the year:

• The entire ≈$22,000 is due within the ATO’s standard payment timeframe after assessment.
• If unpaid, the ATO can apply general interest charge (GIC) (a compounding rate published quarterly, often around 8–10% per year, depending on conditions), turning a $22,000 bill into more than $24,000 over a couple of years of non‑payment.

Old vs better practice

• Old (caught‑off‑guard): Treat business income like a salary and spend most of it; only think about tax at year‑end.
• Better: From the very first invoice, move 25–30% of every payment into a separate “tax account” and use the ATO’s online services to opt into PAYG instalments based on actual profit.

The regulator (ATO) explicitly warns that businesses must plan for tax obligations and that failure to pay on time incurs additional charges.

The second, compounding trap

Mechanism: No compulsory super contributions for self‑employed people

• If you’re self‑employed as a sole trader or in a partnership, you do not have to pay super guarantee for yourself.
• Unlike employees, who automatically receive 12% SG on their ordinary time earnings, self‑employed people must make voluntary super contributions from after‑tax profits and then claim a personal tax deduction if eligible.
• Most self‑employed people cannot salary sacrifice as they are not employees of their own business, so they miss the simple “pre‑tax” contribution mechanism that employees use.

Contribution caps and tax treatment (2025–26)

• Concessional (before‑tax/deductible) cap: $30,000 per year.
• Non‑concessional (after‑tax) cap: $120,000 per year, with a three‑year bring‑forward rule available under 75.
• Concessional contributions are taxed at 15% within the fund, rather than your marginal tax rate, which for middle‑income self‑employed people is often 32.5% or higher.
• If your combined income plus concessional contributions exceeds $250,000, the excess contributions are taxed at 30% in the fund (additional 15% Division 293 tax).

What catches new business owners off guard

• Many new sole traders assume super is “optional until I’m more established”, not realising they are missing out on the equivalent of 12% of their income in annual retirement savings that employees receive automatically.
• Others make large irregular contributions but fail to lodge a “notice of intent to claim a deduction” with their fund before lodging their tax return; the ATO then treats the contribution as non‑concessional, and they miss both the deduction and the lower 15% contributions tax.

Quantified long‑run cost of inaction

Take a self‑employed person earning $90,000 a year from age 35 to 65 who contributes nothing to super:

• An employee on $90,000 receiving SG at 12% would get $10,800 per year into super.
• Over 30 years, that is $324,000 in contributions (excluding investment earnings).

Assuming a conservative 5% annual net return inside super:

• Annual SG contributions of $10,800 at 5% for 30 years grow to roughly $720,000 by age 65 (compound interest model based on standard annuity formula).
• A self‑employed person who makes no contributions could have $0–$50,000 depending on any residual balances, meaning a potential shortfall of around $670,000 in retirement savings compared with an employee on the same income.

If the self‑employed person contributes but breaches caps:

• Exceeding the $30,000 concessional cap means excess contributions are taxed at their marginal rate (up to 47% including Medicare), minus a 15% offset.
• Exceeding the $120,000 non‑concessional cap can attract tax of up to 47% on the excess amount, wiping out nearly half of the benefit of that contribution.

What this looks like in practice

Persona

• Name: Emma
• Age: 32
• Job: Freelance graphic designer (sole trader)
• Income: $95,000 gross business income in 2025–26
• Years to retirement: 33 years (to age 65)
• Current super: $35,000 in an industry fund from past employment
• Structure: Sole trader with ABN, no employees yet

Discovery 1 — The hidden first‑year tax bill

Emma assumed her accountant would “sort out the tax” and treated most of the $95,000 as spending money.

• Her taxable income after minimal deductions is $90,000.
• When she lodges her first sole trader tax return, the ATO issues a notice of assessment for ≈$22,000 (income tax plus 2% Medicare levy).
• She had only $5,000 saved, leaving a shortfall of ~$17,000, plus exposure to GIC interest if unpaid.

Comparison: vs an employee on $90,000, where PAYG withholding would have drip‑fed tax out of each pay, avoiding a large lump‑sum bill.

Discovery 2 — She has been missing a 12% “pay rise” in super

Emma has not paid herself any super in two years of freelancing.

• On $90,000 in income, an employee would have received $10,800 in SG at the 12% rate from 1 July 2025.
• Over two years, that’s $21,600 in foregone contributions.
• At a 5% net return, even $21,600 left untouched for 33 years could grow to around $96,000 by age 65 (simple compound growth model).

Comparison: vs doing nothing, Emma has already lost a potential ~$96,000 in retirement savings from just two missed years.

Discovery 3 — A small concessional contribution saves more tax than she thought

Emma learns she can make personal deductible contributions as a sole trader:

• She contributes $10,000 to super from her after‑tax business bank account and submits a “Notice of intent to claim or vary a deduction for personal super contributions” to her fund before lodging her tax return.
• The fund pays 15% contributions tax ($1,500) on this $10,000.
• Her assessable income drops from $90,000 to $80,000, saving income tax at her marginal rate (~32.5% plus Medicare).
• Tax saving on the $10,000 deduction is roughly $3,250–$3,450, depending on precise brackets (≈32.5–34.5% including Medicare).

Net effect:

• Emma pays $1,500 inside super but saves roughly $3,350 in income tax, coming out ahead by about $1,800 immediately, plus long‑term investment returns on the $10,000.

Comparison: vs leaving the $10,000 in a normal business savings account, taxed at her marginal rate.

The full cost of doing nothing

For Emma, combining Problem 1 (tax shock) and Problem 2 (no super) over her working life:

Assumptions

• Business income stabilises at $90,000 per year (in today’s dollars).
• She continues as a sole trader from age 32 to 65 (33 years).
• She never opts into PAYG instalments and always “catches up” tax at year‑end, occasionally incurring GIC interest.
• She makes no voluntary super contributions beyond her existing $35,000 balance, which grows at 5% net.

Modelled combined cost

1. Tax timing and interest cost (Problem 1)

• Each year, she fails to set aside enough, underpays by an average of $5,000, and clears it 18 months late.
• At a typical GIC around 8% per year, that adds roughly $600 interest per year of late payment.
• Over 20 of 33 years where cash flow is tight, this could cost a cumulative $12,000 in interest alone (20 × $600).

2. Foregone SG‑equivalent contributions (Problem 2)

• Missing $10,800 per year in SG from age 32 to 65 (33 years) is $356,400 in contributions.
• At 5% net return, annual contributions of $10,800 for 33 years compound to roughly $800,000 by age 65 (annuity formula).
• Her actual super (starting at $35,000, 5% growth, no new contributions) would be ≈$165,000.
• Combined shortfall: ~$635,000 less in retirement savings compared with an employee on identical income.

Headline combined impact

• Between GIC interest on late tax and missed concessional super growth, Emma is realistically down by around $650,000 over her career compared with an equivalent employee who receives SG and pays tax via PAYG.
• Most of this loss is silent: she never sees the missed SG contributions or compound growth, only a smaller retirement balance and recurring tax stress.

What to do about it

Move 1 — Set up automatic tax money‑boxing with ATO online

1. Action: Automate your tax planning by treating 25–30% of every invoice as untouchable tax money.

2. Tool/portal:

• myGov → ATO Online Services (Business/Sole Trader account)
• Use the income tax and PAYG instalments sections to view past assessments and set expected instalments.

3. Steps:

• Open a dedicated “Tax Saver” bank account and set an automatic transfer of 25–30% from every client payment your business receives.
• Log into ATO Online via myGov and check your last year’s tax assessment to gauge your effective tax rate on business income.
• Opt into PAYG instalments if offered, or use the ATO’s online tools to make voluntary BPAY or ATO direct credit payments towards your expected bill each quarter.

4. What “good” looks like:

• Your tax account balance at year‑end covers 100% of your assessed tax and Medicare levy, with no GIC interest charged and no payment plans required.

Move 2 — Pay yourself super like an employer would

1. Action: Start paying yourself regular super contributions equal to at least the 12% SG rate.

2. Tool/portal:

• Your existing super fund online portal (e.g., industry fund account).
• Reference ATO “super for employers” and “super for self‑employed” guidance for SG rate and contribution rules.

3. Steps:

• Calculate 12% of your expected annual business income (e.g., 12% of $90,000 = $10,800).
• Set up a monthly BPAY or direct debit from your business or personal account to your super fund for 1/12 of that amount (e.g., $900 per month).
• At the end of the year, submit your fund’s form “Notice of intent to claim or vary a deduction for personal super contributions” so the contribution becomes concessional and deductible in your tax return.

4. What “good” looks like:

• You consistently contribute up to your $30,000 concessional cap without breaching it, and your super contributions equal at least 12% of your income, mirroring an employee’s SG.

Move 3 — Check your contribution caps and avoid penalty tax

1. Action: Audit your super contributions and make sure you do not exceed the concessional and non‑concessional caps.

2. Tool/portal:

• ATO Online Services → Super → Contribution limits view.
• Your super fund’s annual statement, which lists employer, salary‑sacrifice, and personal contributions.

3. Steps:

• Log into ATO Online and note your concessional contributions total for the current financial year; confirm it is ≤$30,000.
• Check your non‑concessional contributions in your fund statements; ensure total is ≤$120,000 (or within the bring‑forward amount if activated).
• If you are close to either cap, pause further contributions for the year or switch to carry‑forward concessional in future years if you have unused caps and a lower income.

4. What “good” looks like:

• Concessional contributions ≤$30,000 and non‑concessional contributions ≤$120,000 per year, with no excess contributions tax assessments or 47% penalties.

A myth worth clearing up

Myth: “As a sole trader, I don’t need to worry about super until my business is bigger — it’s basically optional.”

Fact: While you are not legally required to pay super guarantee for yourself as a sole trader or partner, employees on similar incomes receive 12% of their earnings in super every year by law, and skipping that for decades can leave you hundreds of thousands of dollars behind at retirement.

Sources

• https://www.ato.gov.au/businesses-and-organisations/super-for-employers/work-out-if-you-have-to-pay-super
• https://business.gov.au/finance/superannuation

Researched 2026-06-26.

Corrections & disclosure: an AI-assisted, human-reviewed guide. Every figure is dated and sourced above. Spot something out of date or wrong? Tell us and we’ll correct it — corrections are noted here and in the video description.