๐ ๐ข๐ฑ๐ข๐ง๐ ๐๐๐ ๐๐ก๐๐ฌ๐ ๐ ๐๐ซ๐ซ๐จ๐ซ๐ฌ ๐๐๐๐จ๐ซ๐ ๐๐ง ๐๐๐ ๐๐ฎ๐๐ข๐ญ
06 May 2026
๐ ๐ข๐ฑ๐ข๐ง๐ ๐๐๐ ๐๐ก๐๐ฌ๐ ๐ ๐๐ซ๐ซ๐จ๐ซ๐ฌ ๐๐๐๐จ๐ซ๐ ๐๐ง ๐๐๐ ๐๐ฎ๐๐ข๐ญ
Client Background
Harrison Build Group Pty Ltd is a growing construction and labour-hire business based in Melbourne, Victoria. The business employed 34 staff members including site supervisors, subcontract coordinators, apprentices, and administrative employees.
The company processed payroll weekly using Xero Payroll and had recently transitioned to STP Phase 2 reporting requirements. Initially, management believed the payroll setup was compliant because STP submissions were successfully lodged each payday.
However, during an internal review, the director became concerned after receiving:

- Payroll mismatch warnings
- Incorrect employee income statement categories
- Superannuation discrepancies
- Unusual PAYG withholding variances
- Concerns about employee vs contractor classifications
The directors contacted Supertax before the issues escalated into a formal ATO review or payroll audit.
The Clientโs Problems
When Supertax began reviewing the payroll system, several critical STP Phase 2 issues were identified.
1. Incorrect Income Type Classifications
Several workers were incorrectly reported under the wrong income types.
Examples included:
- Labour hire workers reported as standard salary and wages
- Closely held employees incorrectly categorised
- Allowances combined into ordinary earnings
This created reporting inconsistencies between payroll records and STP submissions.
2. Allowances Were Misclassified
Travel allowances, meal allowances, and site allowances were grouped into gross wages instead of being separately identified under STP Phase 2 reporting categories.
As a result:
- Employee income statements were inaccurate
- Payroll reporting lacked transparency
- ATO data matching risks increased

3. Superannuation Calculation Errors
Certain overtime and allowance categories were incorrectly excluded from superannuation calculations.
This created:
- Potential super guarantee shortfalls
- Risk of Super Guarantee Charge (SGC)
- Exposure to penalties and non-deductible charges
4. Employee Vs Contractor Risk
Some workers had ABNs and invoices, but their working arrangements resembled employees under ATO guidelines.
Indicators included:
- Fixed working hours
- Company-provided equipment
- Direction and control by management
- Ongoing continuous engagement
This created significant payroll tax, PAYG withholding, and superannuation risk.
5. PAYG Withholding Variances
The PAYG withholding reported through BAS did not fully reconcile with STP finalisation figures.
Although the differences initially appeared small, the inconsistencies accumulated over multiple quarters.
This increased the likelihood of:
- ATO review notices
- Payroll reconciliation requests
- Audit attention through automated ATO data matching systems
How Supertax Analysed The Problem
Before making corrections, Supertax performed a detailed payroll diagnostic review.

Step 1 โ Full Payroll Health Check
The team reviewed:
- Payroll setup structure
- Employee categories
- STP mapping settings
- Historical pay runs
- Superannuation settings
- PAYG withholding calculations
- BAS lodgements
- STP finalisation reports
This helped identify where the reporting breakdowns were occurring.
Step 2 โ STP Phase 2 Mapping Analysis
Supertax compared payroll categories against current STP Phase 2 reporting requirements.
The review identified:
| Payroll Area | Issue Found |
|---|---|
| Allowances | Incorrectly grouped into gross wages |
| Income types | Wrong employee classification |
| Overtime | Incorrect STP category mapping |
| Leave categories | Missing reporting labels |
| Super categories | Incorrect ordinary time earnings setup |
Step 3 โ Payroll Reconciliation
The Supertax team reconciled:
- Payroll reports
- STP lodgements
- BAS figures
- Superannuation reports
- General ledger balances
This process identified multiple hidden discrepancies that had accumulated over 14 months.
Step 4 โ Risk Analysis Before Audit
Supertax then assessed the likelihood of ATO attention based on:
- Data matching inconsistencies
- PAYG variances
- Superannuation exposure
- Employee classification risks
- STP reporting irregularities
The analysis concluded the business faced a moderate-to-high compliance risk if the errors remained unresolved.
How Supertax Fixed The Issues
After identifying the problems, Supertax implemented a structured correction strategy.

โ Remapped All Pay Categories
All payroll earning categories were reclassified correctly under STP Phase 2 requirements.
This included:
- Travel allowances
- Overtime categories
- Bonuses
- Site allowances
- Paid leave categories
โ Corrected Superannuation Setup
The payroll system was adjusted to correctly calculate superannuation obligations on applicable earnings categories.
Historical shortfalls were identified and quantified before they became larger compliance issues.
โ Reviewed Worker Classifications
Supertax reviewed contractor arrangements against ATO guidelines to determine whether workers should be treated as employees for:
- PAYG withholding
- Superannuation
- STP reporting
Where required, corrective payroll adjustments were implemented.
โ Reconciled STP And BAS Figures
Historical payroll discrepancies were corrected to align:
- STP reports
- BAS lodgements
- Payroll summaries
- General ledger balances
This significantly reduced future ATO review risk.
โ Implemented Payroll Controls
To prevent future problems, Supertax established:
- Payroll review checklists
- STP reconciliation procedures
- Monthly payroll health checks
- Superannuation verification processes
- Payroll coding controls
The Outcome
After the review and corrections:
| Area | Outcome |
|---|---|
| STP Reporting | Correctly mapped and compliant |
| BAS Reconciliation | Fully aligned |
| Superannuation | Errors identified and corrected |
| Payroll Records | Reconciled and verified |
| Contractor Risks | Reviewed and reduced |
| Audit Exposure | Significantly lowered |
The directors gained confidence knowing their payroll system was properly structured before the ATO identified the issues independently.
Most importantly, the business avoided:
- Escalating payroll compliance exposure
- Potential penalties
- Large historical correction costs
- Increased audit attention
Key Lessons For Businesses
Many businesses assume that because STP reports are โlodging successfully,โ everything is compliant.
But STP Phase 2 errors are often hidden inside:
- Payroll category mapping
- Employee classifications
- Allowance reporting
- Superannuation settings
- BAS reconciliations
The ATO now uses sophisticated data matching systems to compare payroll, superannuation, BAS, and STP information.
Even small inconsistencies can trigger reviews, warning notices, or audits over time.
How Supertax Can Help
Supertax helps businesses identify payroll and STP compliance risks before they become serious ATO problems.

Our team can assist with:
โ STP Phase 2 reviews
โ Payroll reconciliation
โ BAS and PAYG verification
โ Superannuation compliance checks
โ Contractor vs employee reviews
โ Xero and MYOB payroll setup reviews
โ Payroll audit preparation
๐ Talk to Supertax Today
๐ https://supertax.com.au/
๐ Suite 1, 7 Bridge St, Werribee VIC 3030
๐ (03) 7074 8818
๐ง info@supertax.com.au
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