If you earned $1,500 this week but only $1,050 landed in your bank account, where did the other $450 go? It didn't disappear — it went to at least three different places, and your employer sent it there on your behalf before you ever saw it. Understanding deductions isn't just about maths — it's about knowing your legal rights as a worker and being able to check that the right amounts are being taken. Before we calculate anything, think: who do you think is receiving those deductions, and why?
Type your initial response below — you will revisit this at the end of the lesson.
Write your initial response in your book. You will revisit it at the end of the lesson.
Other deductions may include union fees, salary sacrifice, health insurance premiums
$\text{Super contribution} = \text{Ordinary time earnings} \times \text{super rate}$
Current rate: 11.5% (2024–25) — always use the rate stated in the question
Employer super is paid IN ADDITION to gross pay — it does not reduce net pay unless it is a salary sacrifice arrangement
Know
The difference between mandatory deductions (PAYG tax, super) and voluntary deductions
That net pay = gross pay − total deductions
That employer super is paid on top of gross pay, not subtracted from it
Understand
Why net pay is always less than gross pay when deductions exist
Why employer superannuation does not appear in the net pay calculation
How to calculate a percentage-based deduction before subtracting
Can Do
Calculate net pay from gross pay and a list of deductions
Calculate the employer's superannuation contribution
Calculate total employer cost (gross pay + employer super)
Misconceptions to Fix
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Wrong: Net pay is calculated before tax is deducted.
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Right: Net pay = gross pay minus all deductions, including income tax, Medicare levy, superannuation contributions, and any voluntary deductions.
Core Content
Key Terms
DeductionAn amount subtracted from gross pay before net pay is calculated.
Net PayTake-home pay after all deductions have been subtracted from gross pay.
PAYG TaxPay As You Go income tax withheld by the employer each pay period.
SuperannuationEmployer contributions to an employee's retirement fund (currently 11.5%).
Medicare LevyA 2% tax on taxable income that funds Australia's public health system.
What Are Deductions?
Deductions are amounts subtracted from gross pay before the worker receives their take-home pay — some are legally required, others are voluntary.
There are two categories of deductions:
Examples
PAYG income tax withheld, Superannuation guarantee
Union fees, salary sacrifice super, health insurance, workplace loan repayments
Who decides
Law requires it
Employee chooses
In HSC questions, deductions are almost always given to you as dollar amounts — you are asked to calculate their total and subtract from gross pay to find net pay. The formula is simply:
$$\text{Net pay} = \text{Gross pay} - \text{Total deductions}$$
Gross pay minus all deductions equals take-home net pay.
Identify every deduction listed before subtracting: Re-read the question and list all deductions before doing any arithmetic. Missing even one deduction produces a wrong net pay figure.
Common error — Superannuation is not always deducted from net pay: The super guarantee is an employer contribution paid on top of wages — it does not reduce the worker's net pay. However, voluntary extra super contributions (salary sacrifice) do reduce net pay. HSC questions will make this distinction clear — read carefully.
Superannuation
Superannuation is a legislated system requiring employers to contribute a percentage of each worker's earnings into a retirement fund.
The superannuation guarantee rate is 11.5% in 2024–25, rising to 12% from 2025 onwards. In HSC questions, the rate will always be stated — do not assume a rate.
Super is calculated on ordinary time earnings, which generally means the base wage or salary. The employer pays super in addition to the worker's wage — it does not come out of the worker's take-home pay unless the question specifically describes a salary sacrifice arrangement.
Who pays
Employer (on top of wages)
Worker (from their gross pay)
Effect on net pay
No effect — paid to fund separately
Reduces net pay
Use the rate given in the question: The super rate changes each financial year. Never assume 9%, 10%, or any other figure — always use what is printed in the question.
Common error — Don't subtract employer super from gross pay: Employer super is paid by the employer on top of gross pay — it is an additional cost to the employer, not a deduction from the worker. Subtracting it from gross pay to find net pay is incorrect unless the question specifically says it is a salary sacrifice deduction.
Insight — Total employer cost: From the employer's perspective, the total cost of employing someone is: gross wages + super + any employer-paid allowances. A worker on $60,000 gross costs the employer approximately $66,900 per year at 11.5% super ($60,000 × 1.115 = $66,900).
Calculating Net Pay — Putting It Together
Once gross pay is known, net pay is found by identifying and summing all deductions, then subtracting — a straightforward process if the components are clearly organised.
A typical HSC net pay question will give:
Gross pay (or enough information to calculate it)
PAYG tax withheld as a dollar amount
Superannuation as a percentage or dollar amount
Possibly one or two other deductions (union fee, salary sacrifice)
Work through these steps:
Action
Column B
Check whether each deduction is a flat amount or a percentage: Some deductions are given as "$48.50 per week" (flat); others as "2% of gross pay" (percentage). Apply the right calculation to each before summing.
Common error — Net pay is always less than gross pay: If your calculated net pay is larger than gross pay, you have a sign error — you have added a deduction instead of subtracting it. Always sanity-check: net < gross.
Deduction Strategy
The safest way to handle deduction questions is to separate what affects the worker's pay from what is simply an employer cost.
Before you calculate, sort each value into one of these two groups:
Subtract from gross pay: PAYG tax, union fees, salary sacrifice, voluntary deductions
Do not subtract from gross pay: employer super guarantee, employer payroll cost figures
This one step prevents the most common mistake in the opening lesson of Managing Money: treating employer-paid super as if it were money taken out of the employee's wages.
Exam technique: Write a mini heading in your working such as "Deductions from employee pay" before listing the amounts you plan to subtract. This forces you to make the right classification first.
Reasonableness check: If an employer contribution makes the worker's take-home pay smaller in your calculation, stop and re-read the wording. That is often a sign you have classified super incorrectly.
Worked Examples
Worked Example 1Straightforward Net Pay
Problem
Kofi's gross fortnightly pay is $3,240.00. His deductions are: PAYG tax withheld $712.00, union fee $38.50, salary sacrifice super $162.00. Calculate his net pay.
Solution
1$\text{Total deductions} = \$712.00 + \$38.50 + \$162.00 = \$912.50$Sum all listed deductions (PAYG + union + salary sacrifice)
2$\text{Net pay} = \$3{,}240.00 - \$912.50 = \$2{,}327.50$Subtract total deductions from gross pay
3$\text{Check: } \$2{,}327.50 < \$3{,}240.00 \checkmark$Net pay is less than gross pay — answer is reasonable
Worked Example 2Employer Super Contribution
Problem
Amara earns $1,860 per fortnight in ordinary time. Her employer pays superannuation at 11.5%. Calculate: (a) the employer's super contribution for the fortnight, and (b) the total cost to the employer.
Solution
1$\text{Super} = \$1{,}860 \times 0.115 = \$213.90$Apply 11.5% to ordinary time earnings
2$\text{Employer super contribution} = \$213.90$This is paid to the super fund — it does NOT reduce Amara's net pay
3$\text{Total employer cost} = \$1{,}860 + \$213.90 = \$2{,}073.90$Gross wages plus employer super — the true cost of employing Amara
Worked Example 3Full Gross to Net
Problem
Rhys works 38 ordinary hours at $31.50/hr and 5 hours overtime at time-and-a-half in a week. His deductions are: PAYG tax $398.00, salary sacrifice super $95.00, health insurance $42.80. Calculate his gross pay and net pay.
4$\text{Total deductions} = \$398.00 + \$95.00 + \$42.80 = \$535.80$Sum all three deductions
5$\text{Net pay} = \$1{,}433.25 - \$535.80 = \$897.45$Gross minus total deductions
Worked Example 4Deductions vs Employer Cost
Problem
An employee has gross weekly pay of $1,520. Deductions from pay are PAYG tax $286.00 and union fees $14.50. Their employer also pays super at 11.5% of gross pay. Calculate: (a) the worker's net pay, and (b) the total employer cost for the week.
Look back at what you wrote in the Think First section. What has changed? What did you get right? What surprised you?
Check Your Understanding
Checkpoint Questions
Select the best answer for each question. Feedback appears after you choose.
MC
Multiple Choice
5 random questions from a replayable lesson bank — feedback shown immediately
B) $2,286.00
C) $2,166.00
D) $2,042.00
A is correct. Total deductions = $594 + $44 + $120 = $758. Net = $2,880 − $758 = $2,122. Option B omits salary sacrifice; C omits union fees; D uses an incorrect total.
A worker's ordinary fortnightly earnings are $3,400. Their employer pays super at 11.5%. What is the employer's super contribution?
A) $34.00
B) $340.00
C) $391.00
D) $414.00
C is correct. $3,400 × 0.115 = $391.00. Option A divides by 100 twice (uses 0.0115); B uses 10%; D uses 12%.
Gross weekly pay is $1,756.00. After all deductions, net pay is $1,218.40. What is the total amount deducted?
A) $537.60
B) $1,218.40
C) $2,974.40
D) $487.60
A is correct. Total deductions = Gross − Net = $1,756.00 − $1,218.40 = $537.60. Option B states net pay as the deduction amount; C adds instead of subtracts; D is an arithmetic error.
Which amount should usually NOT be subtracted when calculating net pay?
A) PAYG tax withheld
B) Union fees
C) Salary sacrifice super
D) Employer super guarantee
D is correct. Employer super is paid on top of wages and is not normally deducted from the worker's take-home pay.
Written Response Practice
These questions focus on the key skill in this lesson: deciding what should be subtracted and what should not.
Short Answer 1
A worker's gross weekly pay is $1,680. Deductions are PAYG tax $322.00 and union fees $18.00. Calculate the net pay.
Total deductions: $322.00 + $18.00 = $340.00
Net pay: $1,680.00 - $340.00 = $1,340.00
Short Answer 2
An employee earns $2,240 per fortnight in ordinary time. Their employer pays super at 11.5%. Calculate the employer super contribution and the total employer cost.
Employer super: $2,240 × 0.115 = $257.60
Total employer cost: $2,240.00 + $257.60 = $2,497.60
Short Answer 3
A worker has gross pay of $1,940. Deductions are tax $388.50, salary sacrifice super $75.00, and health insurance $26.50. Calculate the net pay.
Total deductions: $388.50 + $75.00 + $26.50 = $490.00
Net pay: $1,940.00 - $490.00 = $1,450.00
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Science Jump
Jump Through Deductions & Net Pay!
Scale the platforms using your knowledge of deductions and net pay calculations. Pool: lessons 1–6.
Net Pay Quick Check
Use this to lock in the core pattern: classify, add deductions, then subtract from gross if needed.
Which formula correctly gives net pay?
A) Net = Gross + Deductions
B) Net = Gross - Deductions
C) Net = Deductions - Gross
D) Net = Gross × Deductions
B is correct. Net pay is the amount remaining after deductions are removed from gross pay.
A worker has gross pay $1,300 and deductions $245. What is net pay?
A) $1,545
B) $1,155
C) $1,055
D) $955
C is correct. $1,300 - $245 = $1,055.
Which is an example of a voluntary deduction?
A) Union fees
B) Gross pay
C) Ordinary hours
D) Annual leave loading
A is correct. Union fees are a common example of a voluntary deduction chosen by the worker.
Why is employer super usually not part of the net pay calculation?
A) Because it is not a percentage
B) Because it only applies to tax tables
C) Because it replaces gross pay
D) Because it is paid by the employer on top of wages
D is correct. Employer super is an extra employer cost, not normally money deducted from the employee's pay.