Add income-earning and private use expenses together
This is the total amount of expenses you need to split between business and private use.
Count the days your asset was used
Include both your income-earning and private use days over the income year.
The combined amount is your asset's total usage.
Divide your income-earning days by total usage
This is your divided amount.
Multiply the total expenses figure by your divided amount
This is your split expenses - the share of your mixed-use expenses that you're allowed to claim.
Add your split expenses to your fully claimable expenses
This is your total claimable expenses. In your tax return you can deduct these expenses from the income you earned from the asset.