Imagine you're a real estate agent who just sold a $1.2 million house. You don't get paid an hourly wage for that — you get a cut of the sale price. But what happens in a slow month when nothing sells? And what about factory workers paid per item they produce — is it fair that a faster worker earns more than a slower one doing the same job? These payment systems reward output, not time. Before we do the maths, think: what are the advantages and risks of being paid this way?
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Key Relationships — This Lesson
$\text{Flat commission} = S \times r$
$S$ = total sales ($) | $r$ = commission rate as a decimal (e.g. 3.5% → 0.035)
Tiered commission: apply each rate only to the sales within that tier — never the top rate to the full amount
Know
The formulas for flat commission, retainer + commission, and tiered commission
The piecework formula: items × rate per item
That leave loading is 17.5% of 4 weeks' ordinary pay
Understand
Why tiered commission applies each rate only to its slice — not to the full total
Why leave loading is based on 4 weeks' pay, not the annual salary
How to convert a percentage rate to a decimal before multiplying
Can Do
Calculate flat and retainer-based commission earnings
Work through a tiered commission structure step by step
Calculate piecework pay and annual leave loading
Misconceptions to Fix
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Wrong: Commission is always calculated as a percentage of total sales.
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Right: Commission can be a flat rate per item (piecework), a percentage of sales, or a retainer plus commission. Different industries use different structures.
Core Content
Key Terms
CommissionPayment calculated as a percentage of sales made.
PieceworkPayment based on the number of items produced or tasks completed.
Leave LoadingAn extra payment (often 17.5%) on top of normal pay during annual leave.
RetainerA fixed regular payment plus commission, common in real estate sales.
RoyaltyPayment to the owner of intellectual property based on sales or usage.
Commission — Flat and Retainer-Based
Commission pays workers a percentage of the value of sales they make, linking income directly to performance.
A flat commission means the worker earns only a percentage of their total sales — there is no guaranteed base. For example, a commission rate of 3.5% on $45,000 of sales gives $1,575.
A retainer plus commission means the worker receives a fixed weekly or monthly retainer (a guaranteed base amount) plus a percentage of sales on top. This is more common in roles where sales can be unpredictable. The retainer provides income security; the commission provides incentive.
In HSC questions, always check whether the commission is applied to total sales or only to sales above a threshold — read carefully.
Convert the percentage to a decimal before multiplying: 3.5% = 0.035, not 3.5. Multiplying by 3.5 instead of 0.035 gives an answer 100 times too large.
Common error — Commission on total sales vs sales above threshold: Some questions say "5% commission on all sales above $10,000." This means you subtract $10,000 first, then apply 5%. Applying 5% to the full sales figure is a very common and costly error.
Tiered Commission
Tiered commission applies different rates to different portions of total sales, rewarding higher performers with progressively better rates on their upper-tier sales.
A tiered commission structure might look like: 2% on the first $20,000 of sales, 3.5% on sales from $20,001 to $50,000, and 5% on any sales above $50,000. If a salesperson achieves $65,000 in sales, you do NOT apply 5% to the whole $65,000. Instead, calculate each tier separately:
Tier
Sales in tier
Rate
Commission earned
Tier 1
$20,000
2%
$400
Tier 2
$30,000
3.5%
$1,050
Tier 3
$15,000
5%
$750
Total
$65,000
—
$2,200
Calculate each tier's commission separately, then sum the results.
Calculate the amount in each tier separately: Find how much of the total falls within each bracket before applying the rate. Writing it as a table prevents errors and shows full working.
Common error — Don't apply the top rate to total sales: Applying 5% to the full $65,000 gives $3,250 — $1,050 more than the correct answer of $2,200. Tiered means each rate applies only to the slice of sales in that tier.
Piecework and Leave Loading
Piecework pays per item produced; leave loading is a bonus paid on top of annual leave pay to compensate workers for lost penalty rates during holidays.
Piecework is common in manufacturing, agriculture, and some creative industries. The pay is simply: number of items × rate per item. For example, picking 340 kg of fruit at $1.85/kg = $629.00.
Leave loading is 17.5% of four weeks' ordinary pay. It exists because workers on annual leave cannot earn overtime or penalty rates — the 17.5% partially compensates for this. The calculation:
Take the worker's normal weekly wage
Multiply by 4 (weeks of leave)
Multiply by 0.175 (17.5%)
This loading is paid in addition to the normal leave pay, not instead of it.
Leave loading is 17.5% of 4 weeks' pay — not of annual salary: Using the annual salary figure instead of 4 weeks' pay gives an answer 13 times too large. Always start with the weekly wage.
Common error — Piecework rate units must match: If the rate is per kilogram, the quantity must be in kilograms. If a question gives quantity in tonnes, convert before multiplying. Unit mismatches are a regular source of dropped marks.
Insight: Leave loading is only calculated on ordinary-time pay. If a worker earns overtime regularly, that is not included in the 4-week base. HSC questions will usually just give you the weekly wage to make this straightforward.
Choosing the Right Payment Model
The hardest part of this topic is often deciding which model the question is describing before you start calculating.
Use the wording of the question as your guide. If the payment is based on a percentage of sales, it is a commission problem. If payment depends on the number of items produced, it is piecework. If the question refers to annual leave and a 17.5% bonus, it is leave loading. Once you identify the model, the calculations become much more manageable.
If the question says...
Think...
Main action
"x% of sales"
Commission
Multiply sales by decimal rate
"retainer plus x%"
Retainer + commission
Add fixed amount after commission
"first... then..."
Tiered commission
Split the sales into tiers
"per item", "per kg", "per box"
Piecework
Quantity × rate per unit
"17.5% of 4 weeks' pay"
Leave loading
Find 4 weeks' pay, then multiply by 0.175
Exam technique: Before calculating, write a short note such as "This is tiered commission" or "This is leave loading." That habit helps prevent using the wrong formula under pressure.
Worked Examples
Worked Example 1Retainer + Commission
Problem
Daniela works as a car salesperson. She receives a weekly retainer of $620 and a commission of 2.8% on all sales. In one week she sells $84,000 worth of cars. Calculate her total earnings for the week.
Solution
1$\text{Commission} = \$84{,}000 \times 0.028 = \$2{,}352.00$Convert 2.8% to 0.028 and multiply by total sales
James earns commission on a tiered structure: 3% on the first $15,000 of monthly sales, 4.5% on sales from $15,001 to $40,000, and 6% on sales above $40,000. In March he achieves $55,000 in sales. Calculate his total commission.
2$= \$437.10$Multiply carefully and keep the money format
3$\text{Answer} = \$437.10$This is the pay for that shift
Revisit Your Initial Thinking
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) $20,020.00
C) $200,200.00
D) $19,110.00
B is correct. $910,000 × 0.022 = $20,020.00. Option A divides by 100 twice (uses 0.0022); C multiplies by 22 instead of 0.022; D uses 2.1% instead of 2.2%.
A worker's tiered commission is 4% on the first $20,000 and 7% on sales above $20,000. They achieve $35,000 in sales. What is their total commission?
A) $2,450.00
B) $1,850.00
C) $2,150.00
D) $2,800.00
B is correct. Tier 1: $20,000 × 0.04 = $800. Tier 2: $15,000 × 0.07 = $1,050. Total = $1,850. Option A applies 7% to all $35,000; C applies 4% to all sales; D applies the higher rate incorrectly to the full amount.
An employee earns $980 per week. What is their annual leave loading?
A) $171.50
B) $343.00
C) $686.00
D) $2,744.00
C is correct. 4 weeks' pay = $980 × 4 = $3,920. Loading = $3,920 × 0.175 = $686.00. Option A applies 17.5% to one week only; B applies to 2 weeks; D applies 17.5% to the annual salary ($980 × 52).
A worker is paid $1.80 per item produced. If they complete 245 items, what is their piecework pay?
A) $441.00
B) $426.80
C) $245.18
D) $137.25
A is correct. Piecework pay = 245 × $1.80 = $441.00.
Written Response Practice
These are ideal HSC-style short-answer questions because each one tests whether you can identify the model before calculating.
Short Answer 1
A salesperson receives a retainer of $540 plus 3.2% commission on sales. In one week, they make $48,000 in sales. Calculate their total earnings.
Commission: $48,000 × 0.032 = $1,536.00
Total earnings: $540 + $1,536 = $2,076.00
Short Answer 2
A worker is paid $2.45 per box packed. They pack 172 boxes in a day. Calculate the day's pay.
Piecework pay: 172 × $2.45 = $421.40
Short Answer 3
An employee earns $1,120 per week in ordinary time. Calculate the annual leave loading paid on 4 weeks of leave.
4 weeks' pay: $1,120 × 4 = $4,480
Leave loading: $4,480 × 0.175 = $784.00
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