How to Claim Tax Deductions in Australia (2026 Guide)

A plain-English guide to claiming tax deductions in Australia, covering the core ATO tests, records, mixed-use expenses, reimbursements and common claim mistakes.

Last reviewed: 27 April 2026

This page is for readers who want the basic claim framework before they dive into a specific occupation guide.

It summarises the broad ATO-style tests that sit behind many work-related and business deduction claims without pretending every occupation follows the exact same pattern.

Quick answer / overview

The safest way to claim a deduction is to work through the rule, the work or business connection and the records in that order. Most weak claims fail because the expense is partly private, reimbursed or not supported by a clear calculation.

A simple way to check a claim

  1. Make sure the expense is tied to your current work or business and that you paid it yourself.
  2. Work out the work-related or business-use share instead of claiming the full amount by default.
  3. Keep the receipt, invoice or working paper that shows how you calculated the claim.

Claims that usually need extra care

  • Cars, phones, internet and home-office costs with mixed private use.
  • Anything reimbursed by an employer or client.
  • Training or study costs that do not clearly relate to your current income activity.

Common deductions people in this topic may be able to review

  • Unreimbursed work or business expenses that have a genuine income-producing connection.
  • The work-related or business-use share of mixed items such as phones, internet, cars or equipment where records support the split.
  • Costs linked to your current work or business activity, depending on the ATO rules for that type of expense.
  • Record-keeping or bookkeeping costs that help support an otherwise valid claim or business activity.

What is commonly not deductible

  • Private or domestic spending.
  • Reimbursed expenses.
  • Claims based on guesswork instead of records.
  • Expenses that relate to a new income direction rather than your current work or business.

Record-keeping requirements

  • Keep receipts, tax invoices, statements, bank records and any working papers that show how you calculated the claim.
  • For mixed-use items, keep a simple apportionment method instead of claiming the full cost by default.
  • If you claim vehicle costs, keep the logbook or travel records needed for the method you use.
  • Store records in a way that lets you trace a deduction back to the actual work or business activity quickly.

Use the record-keeping guide if you need the broader checklist behind these points.

Common mistakes

  • Treating an expense as deductible because it feels work related, even though it fails the ATO tests.
  • Claiming 100 percent of a mixed-use item without separating private use.
  • Ignoring the impact of reimbursements, allowances or business structure on the claim.
  • Waiting until year end to rebuild records from memory.

Frequently asked questions

Do I need a receipt for every claim?

Good records are a core part of a supportable claim. The right evidence depends on the expense, but relying on memory is a weak approach.

Can I claim something if I partly use it for private reasons?

Sometimes, but usually only for the work-related or business-use share and only where you can support the split.

Should I start with this page or an occupation guide?

Use this page for the broad rules, then move to the closest occupation guide so you can see how the general framework applies in that work context.

Related guides

Closest guides and hubs

Support pages

More related guides

If you want a closer occupation match or a narrower claim question, these are the best next steps.

Review note, sources and disclaimer

Reviewed by: Australia Tax Deductions editorial team

Review date: 22 March 2026

Methodology: Read the Editorial Policy and Review Methodology pages for how this site checks and updates content.

Primary references

General educational information only. Tax outcomes depend on your circumstances, records, business structure and the current ATO rules. Check the latest official guidance or speak with a registered tax professional before acting on any deduction claim.