For individual tax returns, you need to be able to prove that your expense was directly incurred to produce income. 

Unfortunately, you cannot claim everything since there must be a reasonable connection between the expense and your current or expected income.

Therefore, a person cannot claim a tax deduction for buying something that is used for private, "domestic" or personal purposes (e.g. a TV or fridge for your home).

According to the Australian Tax Office website, a deduction must be work-related, and:

• You must have spent the money
• It must be directly related to earning your income, and
• You must keep a record to prove the expense was incurred

Businesses

The rules are a little different for businesses and the self-employed, because you may also be able to claim expenses that are necessary to conduct your business to earn income. 

The ATO says, "you can claim tax deductions for most costs you incur in running your business".

Prove it

Regardless of the way you earn income, an efficient way to maximise your tax deductions is to keep tax receipts from every purchase in a safe place.

Although many Aussies may no longer be required to keep receipts, having a paper record of a purchase can help to keep track of cash transactions (which don't show up on your bank statement). 

Sometimes, you'll get 2 receipts for a purchase (like buying fuel from the petrol station) -- make sure you keep the one which says "tax invoice".

Keep receipts or a record of purchase for:

• Travel and transport expenses
• Wages or invoices you pay, including Super
• Repairs and maintenance expenses
• Home office expenses (computers, electricity, etc.)
• Investments made for the business

Do this before you make a big purchase or investment!

Always consult a licensed tax agent before you make a big financial decision if you think it may affect your taxable position.

Depending on the expense, it could save you thousands -- or tens of thousands -- of dollars if you get expert advice upfront. 

For example, did you know the tax rates for a company are lower than the highest tax rates for a person?

Or, did you know that different rates of depreciation can rapidly change how much you can claim for tax in the future?

The point is, paying a few hundred bucks to talk to an accountant before a BIG purchase could save you thousands of dollars in unnecessary tax down the track.