Allowable Tax Deductions and Taxable Income Revision Notes for HSC SSCE Mathematics Standard

Allowable Tax Deductions and Taxable Income

Understanding allowable tax deductions

An allowable tax deduction is an expense that the Australian Taxation Office (ATO) permits you to subtract from your gross income. This reduces your taxable income, which means you may pay less tax. The ATO provides detailed information about which expenses qualify as deductions on their website at www.ato.gov.au.

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The ATO regularly updates their guidelines on allowable deductions. Always check the current year's requirements when preparing your tax return, as rules and rates may change from year to year.

Categories of allowable tax deductions

The following expenses may be claimed as tax deductions:

Work-related expenses – money you spend while doing your job
Self-education expenses – costs for courses or training related to your current employment
Travel expenses – costs for travel that is directly connected to your work duties
Car expenses – costs of using your personal vehicle for work purposes
Clothing expenses – costs for work uniforms, protective clothing, and their cleaning
Tools – the cost of equipment and tools needed for your work
Gifts and donations – contributions made to eligible charitable organisations

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Not all expenses are tax deductible. To claim a deduction, the expense must be directly related to earning your income, and you must have records to prove it. Personal expenses and capital purchases generally cannot be claimed.

Calculating allowable tax deductions

To find your total allowable tax deduction, you need to add together all eligible expenses from the financial year.

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Worked Example: Adding Multiple Deductions

Riley works as an information technology consultant and has the following deductible expenses:

Equipment costs: $1260
Car expenses: $1060
Professional learning: $985
Union fees: $650
Charity donations: $250
Tax agent fee: $212

Question: What is Riley's total allowable tax deduction?

Solution:

Identify what needs to be calculated: total tax deduction
Add all the allowable deductions together:

$\text{Tax deduction} = 1260 + 1060 + 985 + 650 + 250 + 212$

Calculate the sum:

$= \$4417$

Write the answer clearly:

Riley has a total allowable tax deduction of $4417.

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Worked Example: Calculating Car Expense Deductions

Ava has driven her personal car for 7900 kilometres on work-related travel during the financial year. She can claim 70 cents per kilometre travelled.

Question: Calculate Ava's car expense tax deduction.

Solution:

Identify what needs to be calculated: car expense deduction
Multiply the distance travelled by the rate per kilometre:

$\text{Tax deduction} = 7900 \times 0.70$

Calculate the result:

$= \$5530$

Write the answer clearly:

Ava has an allowable tax deduction of $5530 for her car expenses.

Understanding taxable income

Each year, people who earn an income must complete a tax return, either on paper or online through the ATO website. A tax return is a document that shows your total income, the tax you have already paid, and any allowable deductions you are claiming.

Most employees have PAYG (Pay As You Go) tax automatically taken from their wages or salary throughout the year. The amount of PAYG tax deducted might be more or less than the actual tax you owe.

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If your PAYG tax deductions were more than your actual tax liability, you will receive a tax refund. If they were less, you will need to pay the difference to the ATO.

What is taxable income?

Taxable income is the amount of money on which your tax is calculated. It equals your gross income minus any allowable tax deductions.

Gross income is the total amount of money you earn from all sources during the year. This includes:

Your salary or wages
Interest earned on savings
Profits from shares or investments
Any other payments received

Formula for taxable income

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Key Formula:

$\text{Taxable income} = \text{Gross income} - \text{Allowable tax deductions}$

This is the fundamental formula for calculating how much of your income will be taxed. Always ensure you have identified all income sources and eligible deductions before applying this formula.

Calculating taxable income

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Worked Example: Basic Taxable Income Calculation

Anthony is a businessman with a gross salary of $93,250 per year. His accountant calculated that he has $2890 in allowable tax deductions.

Question: What is Anthony's taxable income?

Solution:

Identify what needs to be calculated: taxable income
Subtract the deductions from the gross income:

$\text{Taxable income} = 93\,250 - 2890$

Calculate the result:

$= \$90\,360$

Anthony's taxable income is $90,360.

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Worked Example: Multiple Income Sources

Emily is a journalist with a gross annual salary of $87,620. She also earned $5680 from her share portfolio and received $7320 in royalties. Emily has total tax deductions of $6472.

Question: Calculate Emily's taxable income.

Solution:

First, calculate the total gross income by adding all sources:

$\text{Gross income} = 87\,620 + 5680 + 7320$

$= \$100\,620$

Identify what needs to be calculated: taxable income
Subtract the deductions from the gross income:

$\text{Taxable income} = 100\,620 - 6472$

Calculate the result:

$= \$94\,148$

Emily's taxable income is $94,148.

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When you have multiple income sources, you must include all of them when calculating your gross income. This includes salary, investment income, royalties, rental income, and any other money received during the financial year.

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Worked Example: Converting Weekly Pay to Annual

Nicole is a scientist who earns a gross weekly pay of $1624. She has the following allowable tax deductions:

Dry-cleaning: $8 per week
Work-related travel: $60 per year
Union fees: $460 per year
Charitable donations: $620 throughout the year

Questions: a) What is Nicole's gross yearly salary? b) What is Nicole's total allowable tax deduction? c) Calculate Nicole's taxable income.

Solution:

Part a: Calculate annual salary

Identify what needs to be calculated: annual salary
Multiply the weekly pay by 52 weeks:

$\text{Salary} = 1624 \times 52$

Calculate the result:

$= \$84\,448$

Part b: Calculate total deductions

Identify what needs to be calculated: total tax deductions
Add all deductions, converting weekly amounts to annual:

$\text{Tax deduction} = (8 \times 52) + 60 + 460 + 620$

Calculate the result:

$= 416 + 60 + 460 + 620$

$= \$1556$

Part c: Calculate taxable income

Identify what needs to be calculated: taxable income
Subtract the total deductions from the gross income:

$\text{Taxable income} = 84\,448 - 1556$

Calculate the result:

$= \$82\,892$

Nicole's gross yearly salary is $84,448, her total allowable tax deduction is $1556, and her taxable income is $82,892.

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Common Mistake to Avoid:

When working with weekly, fortnightly, or monthly pay periods, always convert to annual figures before calculating taxable income. Remember:

Weekly pay × 52 = Annual salary
Fortnightly pay × 26 = Annual salary
Monthly pay × 12 = Annual salary

The same conversion applies to regular deductions (like weekly dry-cleaning costs).

Exam tips

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Exam Success Tips:

Always check whether income figures are weekly, fortnightly, monthly, or annual, and convert to the required time period
Remember to add all income sources together before subtracting deductions
When calculating car expenses, multiply kilometres by the rate per kilometre
Keep clear records of all work-related expenses throughout the year
Round final answers to the nearest dollar unless otherwise specified

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Key Points to Remember:

Allowable tax deductions are work-related expenses approved by the ATO that reduce your taxable income
Gross income includes all money earned from wages, investments, and other sources during the year
Taxable income is calculated by subtracting allowable deductions from gross income: $\text{Taxable income} = \text{Gross income} - \text{Allowable tax deductions}$
Common deductible expenses include work equipment, car expenses, union fees, professional development, and charitable donations
Always convert pay periods correctly (weekly × 52 = annual) before calculating taxable income
You must include income from all sources when calculating your gross income
Keep accurate records of all expenses you wish to claim as deductions

Allowable Tax Deductions and Taxable Income (HSC SSCE Mathematics Standard): Revision Notes