Published: 4 March 2026

Contractor Tax Calculator Australia (FY 2025-26)

Working as a contractor in Australia is financially rewarding — but tax can get complicated fast. Unlike employees, contractors are responsible for setting aside their own income tax, managing GST, and arranging their own superannuation. This guide breaks down exactly how contractor tax works in FY 2025-26, with practical examples to help you keep more of what you earn.

Employee vs Contractor: What's the Difference?

The ATO draws a clear line between employees and contractors. As an employee, your employer withholds PAYG tax, pays super on your behalf, and handles payroll obligations. As a contractor (sole trader or through a company/trust), you're running a business — and that means tax is your responsibility.

Getting this wrong is costly. Misclassifying yourself (or being misclassified) as a contractor when you're legally an employee can lead to back-tax obligations, penalties, and missed entitlements.

How Is Contractor Income Taxed?

If you operate as a sole trader — the most common setup for independent contractors — your business income is taxed as personal income using the same progressive tax brackets as employees:

• $0 – $18,200: 0% (tax-free threshold)
• $18,201 – $45,000: 19%
• $45,001 – $120,000: 32.5%
• $120,001 – $180,000: 37%
• $180,001+: 45%

The 2% Medicare Levy also applies to most residents on top of these rates. High earners above $93,000 (singles) without private hospital cover also pay the Medicare Levy Surcharge (1%–1.5%).

Worked Example: $120,000 Contractor Income

Let's say you earned $120,000 gross as a contractor in FY 2025-26, with $15,000 in legitimate business deductions (home office, equipment, professional fees):

• Taxable income: $120,000 − $15,000 = $105,000
• Income tax: ~$26,717
• Medicare Levy (2%): $2,100
• Total tax: ~$28,817
• Effective tax rate: ~27.4%
• After-tax income: ~$76,183

Compare this to an employee earning $120,000: they'd pay tax on the full amount with fewer deduction opportunities. That's where contractor tax planning really pays off.

Contractor Deductions: What Can You Claim?

One of the biggest advantages of contracting is the ability to claim business expenses as deductions, reducing your taxable income. Common deductions include:

• Home office expenses: A portion of rent/mortgage, electricity, and internet based on the area used for work
• Equipment and tools: Laptops, monitors, software subscriptions, and industry-specific tools
• Vehicle expenses: Work-related travel using the cents-per-kilometre or logbook method
• Professional development: Courses, certifications, and industry memberships
• Accounting and legal fees: Tax agent fees, contract review, and bookkeeping software
• Insurance: Professional indemnity and public liability premiums
• Super contributions: Voluntary concessional contributions (up to $30,000/year) are tax-deductible

Keep receipts for everything. The ATO can audit contractors at any time, and good records are your best protection.

GST: Do Contractors Need to Register?

If your contractor income exceeds $75,000 per year, you must register for GST. Once registered, you add 10% GST to your invoices and submit quarterly Business Activity Statements (BAS) to the ATO.

For example, if you invoice a client $10,000 + GST, you collect $11,000 and remit $1,000 to the ATO. The GST itself isn't income — it's a flow-through amount. The upside: you can also claim GST credits on your business purchases.

If you earn under $75,000, registration is optional but may still be worth it if your clients are GST-registered businesses.

Super: Your Responsibility as a Contractor

Contractors don't automatically receive employer super contributions — it's on you to fund your retirement. The good news: voluntary super contributions are one of the most tax-effective strategies available.

Concessional (pre-tax) contributions — including personal deductible contributions — are taxed at just 15% inside the fund, compared to your marginal rate (which could be 32.5% or higher). The cap is $30,000 per year in FY 2025-26, including any employer contributions.

If your income is under $57,016, the government super co-contribution scheme may also apply if you make non-concessional (after-tax) contributions.

Important: Some contractors are still entitled to employer super regardless of their contract type. If you work primarily for one client under their direction, the ATO may classify you as an employee for super purposes. Use the ATO's online contractor decision tool if unsure.

How Much Tax Should You Set Aside?

A common rule of thumb for contractors is to set aside 25–35% of gross income for tax. Here's a rough guide by income level (sole trader, no HECS, FY 2025-26):

• $60,000: Set aside ~22% (~$13,200/year)
• $100,000: Set aside ~28% (~$28,000/year)
• $150,000: Set aside ~35% (~$52,500/year)
• $200,000: Set aside ~40% (~$80,000/year)

These are estimates before deductions. Your actual tax will be lower once you claim legitimate business expenses. The key is to never spend money you'll owe at tax time — keep your tax savings in a separate account.

PAYG Instalments for Contractors

Once you start earning contractor income, the ATO will likely enrol you in the PAYG instalment system. Instead of paying one large tax bill at the end of the year, you pay quarterly instalments based on your previous year's income.

If your instalment amount doesn't reflect your current income (e.g., you're earning significantly more or less this year), you can vary it to avoid overpaying or underpaying. Speak to a tax agent if you're unsure how to vary correctly — penalties apply for excessive variations.

Sole Trader vs Company Structure

Most contractors start as sole traders, but as income grows, a company structure may offer tax advantages. Companies pay a flat rate of 25% (for base rate entities with turnover under $50M), compared to personal marginal rates up to 45%. However, company structures involve more administrative overhead, accounting costs, and compliance obligations.

The right structure depends on your income level, liability exposure, and long-term goals. A registered tax agent can model the best option for your situation.