The Income Tax Assessment Act is enormous, but a small business does not need to read it like a textbook. The practical job is to know where income-tax issues show up: pricing, invoices, asset purchases, deductions, losses, owner payments, employee benefits, restructures and business-sale records.
Main laws
Commonwealth Act
Income Tax Assessment Act 1997 (Cth)
The Income Tax Assessment Act affects business income, deductions, losses, depreciation, owner payments and tax records.
In forceCommonwealthPlain-English guide5 practical checks
Plain-English explainers, not legal advice. Use the linked official source for section-level detail, and get advice for your situation.
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Quick read
- This Act is the backbone of income tax for Australian businesses.
- Small-business owners mainly feel it through income, deductions, losses, depreciation, concessions, owner payments and records that must survive accountant, ATO or buyer review.
Likely relevant if
- Companies, sole traders, partnerships and trusts earning business income
- Startups and SMEs claiming deductions, losses, depreciation or concessions
- Businesses buying assets, paying owners or changing structure
Check first
- Identify business income and keep records that support taxable income calculations.
- Review deductions, losses, depreciation and concessions with a tax adviser.
- Separate business, personal, capital and private-use records.
Start here
Key points
- Keep business and personal records separate.
- Ask before assuming an expense is deductible.
- Document asset purchases, finance, depreciation and private use.
- Review tax consequences before restructuring or selling.
Records to keep clean
Documents to keep in order
- Income records, invoices, contracts and bank reconciliations.
- Expense records, supplier invoices and business-purpose notes.
- Asset purchase, finance, depreciation and disposal records.
- Owner payment, dividend, loan and reimbursement records.
- Advice and calculations for concessions, losses or unusual tax positions.
Plain-English glossary
- Assessable income
- Income that must be included when working out taxable income.
- Deduction
- An amount that may reduce taxable income if the legal requirements are met.
- Depreciating asset
- An asset that declines in value over time and may be dealt with under capital allowance rules.
Common questions
Is this page tax advice?
No. It is a legal/compliance map for business owners. Specific tax positions, deductions, concessions and structures should be checked with a tax adviser.
Why include this in a business law library?
Because contracts, structures, asset purchases, owner drawings, employee benefits and sale planning often create income-tax records and consequences.
Should a business owner read the whole Act?
No. Use this page to understand the operational touchpoints, then work with an accountant or tax lawyer on the specific provisions that matter.