How to Calculate Your Tax Refund Before You Lodge

Tax time does not need to catch you off guard. We often see clients across Mildura and regional Australia unsure whether they will receive a refund or face a tax bill. The good news is you can estimate your position before you lodge. With a clear process and the right figures, you stay in control.

In this guide, we walk through how to calculate your tax refund step by step, using practical examples and ATO-aligned methods that work in real situations.

The Simple Formula That Drives Every Tax Refund

How Your Tax Refund Is Actually Calculated

At its core, your tax refund comes down to one simple formula:

“Tax Withheld – Tax Payable = Refund or Amount Owing”

That is it. No tricks. No hidden steps.

• If the result is positive, you receive a tax refund
• If the result is negative, you owe money to the ATO

We often explain it like this: think of your PAYG withholding as prepaying your tax throughout the year. Come 30 June, the ATO squares the ledger.

A quick example we see often:

Item	Amount
Tax withheld (PAYG)	$14,500
Total tax payable	$12,800
Result	$1,700 refund

Now flip it:

Item	Amount
Tax withheld (PAYG)	$10,500
Total tax payable	$12,800
Result	$2,300 owing

Same income. Different outcome. It all hinges on what was withheld versus what you actually owe.

We had a client last year; a nurse working shifts at Mildura Base Hospital—who picked up extra weekend work. Her income jumped, but her PAYG did not keep pace. On paper, she expected a refund. In reality, she had a bill. That is where understanding this formula early saves you from a nasty surprise.

Why Many Australians Miscalculate Their Tax Refund

Here is where things go off track.

Most people look at one number only, their payslip tax withheld, and assume that tells the whole story. It does not.

Several moving parts affect your final tax position:

• Extra income (bank interest, side work, dividends)
• Missed deductions
• Incorrect tax bracket assumptions
• Medicare Levy and surcharge
• Tax offsets that reduce your bill

We often say, “The devil is in the detail,” and tax is no exception.

A common scenario we see:

• A tradie earns $85,000
• Has $15,000 withheld
• Assumes a large refund

But then:

• Claims only $1,000 in deductions (instead of $4,000)
• Has investment income they forgot about
• Pays Medicare Levy

Suddenly, that expected refund shrinks or disappears.

Another curveball is multiple income streams. Someone working a day job and driving Uber on weekends might find their withholding too low. Each payer assumes it is your only job. The ATO does not.

A Quick Checklist Before You Estimate Your Refund

Before you even touch a calculator, get your ducks in a row:

• Gather your income statements (from myGov or employer)
• List all income sources, even the small ones
• Collect receipts for deductions
• Check your PAYG withholding totals
• Confirm your residency status for tax purposes

We tell clients to treat this like a pre-season check before a big game. If your inputs are wrong, your result will be off.

A Practical Way to Think About It

If you prefer a simple mindset, use this:

• Income pushes your tax up
• Deductions pull your tax down
• Offsets cut your tax directly
• PAYG determines if you get money back or pay more

It is a bit like filling and draining a bucket. If more goes in than comes out, you pay tax. If more has already been taken out than needed, you get a refund.

We have sat across the desk from thousands of clients over the years. The ones who understand this early tend to stay in control. The ones who do not? They are often caught off guard.

Step-by-Step Guide to Calculate Your Tax Refund Before Lodgement

Step 1: Work Out Your Total Income

Start with your full income picture. This step sets the foundation. If this number is off, everything that follows will be off as well.

Include all sources:

• Salary and wages (from your income statement or PAYG summary)
• Overtime, bonuses, and allowances
• Bank interest
• Dividends from shares
• Rental income
• Side income (freelancing, Uber, Airtasker, online sales)

We often see people miss small amounts like bank interest. It might only be $80, but the ATO already has that data. Leave it out, and you risk an amendment or review later.

A real example we handled recently:
A local café worker had:

• $52,000 salary
• $120 bank interest
• $3,500 from weekend catering gigs

They only reported their salary. Once we added the extra income, their tax position changed straight away.

A simple table helps:

Income Type	Amount
Salary	$52,000
Side income	$3,500
Bank interest	$120
Total Income	$55,620

That total becomes your starting point.

Step 2: Subtract Your Tax Deductions

Now we reduce that income with legitimate deductions. This is where many people either miss out or overreach.

We stick to a simple rule:

“If it directly relates to earning your income and you can prove it, you can claim it.”

Common deductions include:

Work-related expenses

• Tools and equipment
• Uniforms and protective clothing

Vehicle use for work

• Cents per kilometre method
• Logbook method

Home office costs

• Internet
• Electricity
• Phone usage

Self-education

• Courses that improve skills in your current role

Donations

• To registered charities

Example:

Item	Amount
Total income	$55,620
Deductions	$3,620
Taxable income	$52,000

We had a tradie from just outside Mildura who kept every receipt in a shoebox. Not glamorous, but it worked. Once we sorted it, he claimed an extra $2,800 in deductions he nearly missed.

On the flip side, we also see claims that do not pass the pub test. If you cannot explain how it links to your job, it likely will not stand up.

Step 3: Calculate Your Taxable Income

This step is simple but critical:

Taxable Income = Total Income – Deductions

That final figure is what the ATO uses to calculate your income tax.

Keep your numbers clean. Round figures, double-check totals, and avoid guesswork.

Step 4: Apply Australian Tax Rates (2024–25)

Australia uses a progressive tax system. This means different portions of your income are taxed at different rates.

Here is a clear breakdown:

Taxable Income	Tax Rate
$0 – $18,200	0%
$18,201 – $45,000	16%
$45,001 – $135,000	30%
$135,001 – $190,000	37%
$190,001+	45%

Let’s walk through a practical example.

Say your taxable income is $70,000.

• First $18,200 → no tax
• Next $26,800 → taxed at 16%
• Remaining $25,000 → taxed at 30%

You do not pay 30% on the full $70,000. Only the portion above $45,000 gets that rate. This is where many people get tripped up.

We often hear:
“I moved into a higher tax bracket, so I earn less now.”

That is not how it works. Only the extra income gets taxed at the higher rate.

Step 5: Add the Medicare Levy

Next, add the Medicare Levy.

Most Australians pay:

• 2% of taxable income

Example:

Item	Amount
Taxable income	$70,000
Medicare Levy (2%)	$1,400

This levy supports Australia’s public healthcare system. It applies to most residents unless exemptions apply.

In regional areas like Mildura, where public healthcare plays a big role, this contribution supports services many locals rely on.

Step 6: Check for Medicare Levy Surcharge

Now check if the Medicare Levy Surcharge applies.

You may need to pay this if:

• Your income exceeds the threshold
• You do not have private hospital cover

For singles, this starts around:

• $93,000 to $97,000

Rates range from:

• 1% to 1.5%

We often see this catch people off guard. A client might earn just over the threshold and skip private cover. That choice can lead to a higher tax bill.

It pays to run the numbers early.

Step 7: Apply Tax Offsets

Offsets reduce your tax bill directly. This is different from deductions, which reduce your income.

Common offsets include:

• Low Income Tax Offset (up to $700)
• Senior Australians and Pensioners Tax Offset
• Zone Tax Offset (relevant for some regional areas)

Example:

Item	Amount
Tax payable	$12,000
Offset	$700
New tax payable	$11,300

Offsets can make a real difference, especially for lower to middle income earners.

We once worked with a retiree couple who qualified for SAPTO. They expected to pay tax but ended up with no liability at all. That is the power of offsets when applied correctly.

Step 8: Compare Against PAYG Withholding

Now bring it all together.

Take your final tax payable and compare it to your PAYG withholding.

Checklist before final comparison:

• ✔ Income included correctly
• ✔ Deductions applied
• ✔ Tax rates calculated
• ✔ Medicare Levy added
• ✔ Offsets applied
• ✔ PAYG confirmed

Example:

Item	Amount
Total tax payable	$14,000
PAYG withheld	$15,500
Estimated refund	$1,500

Or:

Item	Amount
Total tax payable	$14,000
PAYG withheld	$12,000
Amount owing	$2,000

This final step answers the question everyone asks:
“Am I getting money back, or do I owe?”

A Timeline You Can Follow Each Year

Keeping your tax under control is easier with a simple timeline:

July – August

• Gather income statements
• Start reviewing deductions

September – October

• Finalise your numbers
• Lodge early if ready

Before 31 October

• Lodge yourself, or
• Register with a tax agent for extended deadlines

We often tell clients: do not leave it until the last minute. Rushing leads to missed deductions or errors.

Residency Status and Why It Changes Your Tax Refund

Are You an Australian Resident for Tax Purposes?

This is one of those areas where people trip up without realising it. Your residency status for tax purposes is not the same as your visa or citizenship.

We see this often with seasonal workers and people moving between regions for work.

In simple terms, you are generally considered a resident if:

• You live and work in Australia for more than 183 days
• You have established a home here
• Your day-to-day life is based here

Residents get access to:

• The $18,200 tax-free threshold
• Lower tax rates

Non-residents:

• Pay tax from the first dollar
• Face higher starting rates

A quick example:

Status	Tax-Free Threshold	Starting Tax Rate
Resident	$18,200	0%
Non-resident	$0	Higher rates apply

We once helped a backpacker working on farms around the Sunraysia region. They assumed they would get a refund. Once we reviewed their status, they were taxed as a non-resident. The result flipped from refund to a small tax bill.

Getting this right early saves time and stress later.

Why Residency Has a Big Impact on Your Outcome

Residency affects:

• Your tax-free threshold
• Your tax bracket
• Your eligibility for offsets

If you get it wrong, your entire calculation shifts.

We always say, “Start with the right foundation.” Residency is that foundation.

How to Increase Your Tax Refund Without Crossing the Line

Deductions That Often Get Missed

This is where many people leave money on the table.

We see it year in, year out. People rush their income tax filing and forget the details that matter.

Here are areas worth reviewing:

Work-related expenses

• Protective clothing and uniforms
• Tools and equipment

Vehicle expenses

• Travel between job sites
• Use either:
  • Cents per kilometre method
  • Logbook method

Home office

• Internet and phone
• Electricity usage

Self-education

• Courses linked to your current job

A practical example:
A teacher in regional Victoria worked partly from home during the year. They did not realise they could claim part of their internet and electricity. Once added, their refund increased by over $600.

It is not about pushing the limits. It is about claiming what you are entitled to, and backing it up properly.

Record-Keeping: The Habit That Pays Off

Good records make tax time easier. Poor records cost money.

The ATO expects you to keep records for five years. That includes:

• Receipts
• Invoices
• Logbooks
• Bank statements

A simple system we recommend:

• Take photos of receipts as you go
• Store them in a folder (digital or cloud)
• Track work travel weekly

We have seen clients try to rebuild a year’s worth of expenses in one weekend. It rarely ends well.

Better to chip away at it during the year. A stitch in time saves nine.

Key Deadlines You Cannot Afford to Miss

Important Dates for Your Tax Return

Timing matters. Miss a deadline, and penalties can follow.

Key dates:

• Financial year ends: 30 June
• Self-lodgement deadline: 31 October
• Tax agent deadline: up to 15 May (if registered on time)

If you use a registered tax agent, you often get more time. That alone takes pressure off.

What Happens If You Lodge Late?

The ATO applies a Failure to Lodge penalty.

Current structure:

• $330 per 28 days late
• Maximum of $1,650

We have seen people delay lodging because they think they owe money. That usually makes things worse.

Even if you cannot pay straight away, lodging on time avoids extra penalties.

Smart Ways to Stay Ahead of Your Tax Position

Keep an Eye on Your PAYG Withholding

Your PAYG withholding plays a major role in whether you receive a refund or an amount owing.

We recommend:

• Checking your payslip regularly
• Adjusting withholding if your income changes

This is especially important if:

• You have more than one job
• You receive bonuses
• You earn side income

A common example:
A worker with two part-time jobs often underpays tax because each employer applies the tax-free threshold. At year-end, the ATO combines income, and a tax bill appears.

Use Tools That Give You Clarity

You do not need to do this all manually.

Options include:

• A tax refund calculator
• Tax software
• Working with a registered tax accountant

We handle returns online from start to finish. Clients submit their details, we review everything, and then lodge with the ATO. It keeps the process clear and reduces errors

For many people, having someone double-check the numbers is worth its weight in gold.

Final Thoughts: Estimate First, Lodge With Confidence

A Simple Checklist Before You Lodge

Before you hit submit, run through this:

• ✔ All income included
• ✔ Deductions backed by records
• ✔ Tax rates applied correctly
• ✔ Medicare Levy included
• ✔ Offsets applied
• ✔ PAYG verified

If you tick these off, you are in a strong position.

The Bottom Line from Our Experience

After years working with clients across Australia, one thing stands out.

People who estimate their tax position early stay in control. They avoid surprises. They make better decisions.

Those who leave it until lodgement often feel like they are flying blind.

If there is one takeaway, it is this:

“Know your numbers before the ATO tells you.”

That small step can make tax time smoother, faster, and far less stressful.