What Is a Tax Deductible Expense? What You Can (Legally) Claim

A tax deductible expense is a cost directly related to earning your income, which you can subtract from your total income to reduce your taxable income.

Whether you’re a sole trader, employee, or company, claiming eligible deductions lowers your tax bill — but only if the expenses are legitimate and documented.

What Makes an Expense Deductible?

To be deductible, an expense must be:

• Directly related to earning assessable income
• Not private, domestic, or capital in nature (with some exceptions)
• Supported by evidence or receipts
• Incurred in the same income year you’re claiming it

Some expenses may require apportionment if they’re partially private or used across multiple income sources.

Common Tax Deductible Expenses

Category	Examples
Business operating costs	Rent, phone, subscriptions, insurance
Work-related travel	Car expenses, fuel, parking (business only)
Office or home office	Internet, electricity, furniture (pro rata)
Staff & contractors	Wages, super, freelance invoices
Professional services	Accounting, legal, consulting fees
Marketing	Ads, SEO, branding, website costs
Depreciation	Equipment, tools, vehicles (via write-off)

What You Can’t Deduct

• Personal or household expenses
• Fines and penalties (e.g. speeding tickets)
• Entertainment (with limited exceptions)
• Costs not directly tied to income
• Items bought for private use (e.g. non-work clothes)

If in doubt — it’s safer to ask an accountant.

Claiming Deductions on Tax Returns

For Individuals	For Businesses
Claimed via individual tax return	Claimed via business return (company/trust)
Requires receipts or logbooks	Requires full documentation and coding
ATO uses benchmarks to detect anomalies	Can be reviewed in audit or review

How Ozobooks Helps

• Reviews your expenses to ensure they’re eligible
• Helps separate personal vs business costs
• Applies current ATO deduction rules (e.g. instant asset write-off)
• Prepares deductions for BAS and annual tax returns
• Supports documentation for audits or reviews

FAQ

Q1: Can I deduct something I paid for personally?
Yes — if it’s a valid business expense and you reimburse yourself properly or log it as an owner contribution.

Q2: Do I need a receipt for every deduction?
Generally, yes — the ATO expects proof of purchase unless it’s below a low-value threshold (e.g. <$10). Some exceptions apply for logbooks and travel diaries.

Q3: Are work clothes deductible?
Only if they are protective, branded, or occupation-specific (not general business attire).

Q4: Can I deduct startup costs?
Some capital costs like company registration may be deductible over time or via instant write-offs — Ozobooks can help structure them properly.