The Only BAS Tool withDirect ATO Integration
Pre-lodgement BAS audit with ABN verification, TPAR validation, GST anomaly detection, and land tax calculations. Verify every supplier against ATO records before you lodge.
Bulk ABN Verification Against ATO Records
Don't just check ABN format — verify every supplier directly against the Australian Business Register. Know instantly if ABNs are valid, cancelled, or if GST registration has lapsed.
- Direct ATO API: Real-time verification against official ATO records
- Bulk scanning: Verify 100+ suppliers in seconds, not hours
- GST registration: Check if suppliers are registered for GST
- Entity name matching: Verify ABN belongs to the expected business
ABN Verification Results
TPAR Validation
TPAR Validation with ATO-Ready Exports
Stop manually preparing TPAR. BAS Guardian automatically identifies reportable payments, validates contractor details, and generates ATO-compliant CSV files ready for lodgement.
- Auto-detection: AI identifies contractors in building, cleaning, IT, courier, and security industries
- Pre-lodgement validation: Catch missing ABNs and invalid data before ATO rejection
- ATO CSV export: One-click export in exact ATO format — no manual formatting
- Audit trail: Full history of TPAR validations and exports for compliance records
State-by-State Land Tax Calculator
Calculate land tax liability across all Australian states and territories. Track threshold exemptions, apply surcharges, and maintain calculation history.
- All states: NSW, VIC, QLD, SA, WA, TAS thresholds and rates
- Threshold tracking: Know when aggregated values exceed exemption limits
- Surcharge support: Foreign owner and absentee surcharges calculated
- Calculation history: Track estimates over time for planning purposes
Land Tax Calculation - NSW
2025-26🚨 BAS Audit Complete: 3 Critical Issues Found - Acme Corp
Your Q2 BAS audit detected $1,240 GST on exempt items and 2 potential personal expenses. Review before lodging...
⚠️ TPAR Validation: 4 Suppliers Missing ABN - BuildCo
Your TPAR report has 4 suppliers with invalid or missing ABNs. Total payments affected: $45,200...
✅ ABN Verification Complete - All 127 Suppliers Valid
Great news! All supplier ABNs verified against ATO records. GST registrations confirmed. Ready to lodge...
Know About Issues Immediately
Get notified the moment BAS Guardian finds critical issues. Receive deadline reminders, audit completion reports, and TPAR validation alerts.
- Critical issue alerts when GST errors or invalid ABNs detected
- TPAR deadline reminders before 28 August each year
- Audit completion reports when files pass all checks
Filling the Gaps Others Leave Behind
Features that existing BAS tools simply don't offer
Direct ATO ABN API
Real-time verification against official ATO records — not just format validation
TPAR CSV Export
One-click ATO-ready exports with pre-lodgement validation built in
Multi-State Land Tax
All Australian states with threshold tracking and surcharge calculations
File Health Included
Every BAS Guardian subscription includes takeover assessment at no extra cost
Complete Pre-Lodgement Compliance
Everything you need to audit, validate, and document every BAS period
GST Anomaly Detection
Automatically flag bank fees, insurance, and items commonly miscoded with GST. AI identifies personal expenses.
Direct ATO ABN Verification
Bulk verify every supplier ABN directly against ATO records. Check GST registration status instantly.
TPAR Validator & Export
Pre-lodgement TPAR validation with contractor detection and ATO-ready CSV exports. Never submit invalid data.
Land Tax Calculator
State-by-state land tax calculations with threshold tracking. NSW, VIC, QLD, SA, WA, and TAS supported.
BAS Period Reconciliation
Compare GST collected vs reported across multiple periods. Catch discrepancies before the ATO does.
File Health Included Free
Every BAS Guardian subscription includes File Health Inspector at no extra cost — assess file quality instantly.
How BAS Guardian Works
Four simple steps to audit-proof every BAS
Connect Your File
Link your MYOB company file to DataCartel. Your data syncs automatically.
Run Full Audit
One click runs GST analysis, ABN verification, TPAR validation, and anomaly detection.
Review & Export
See issues with severity ratings. Export ATO-ready TPAR files and compliance reports.
Lodge with Confidence
Submit knowing every supplier is verified and every transaction validated.
Simple, Transparent Pricing
Pay per company file. Cancel anytime.
BAS Guardian
- GST anomaly detection & pre-lodgement audit
- Direct ATO ABN bulk verification
- TPAR validation & ATO-ready CSV exports
- State-by-state land tax calculator
- File Health Inspector included FREE
- Practice Dashboard included FREE
20% off with annual billing
Want more modules? View bundle pricing
Stop Worrying About BAS Errors
Join accountants across Australia using BAS Guardian to verify suppliers, validate TPAR, and catch errors before the ATO does.