01
Rule Engine
Most bookkeeping tools hand everything to an LLM. BAS Flow AI applies deterministic accounting rules first — priority-ordered, versioned, and plugin-extensible.
Phase 1 · Deterministic core
AI bookkeeping for
Australian accountants
Upload CSV or PDF bank statements. Automatically classify transactions, calculate GST, and prepare BAS-ready bookkeeping using explainable AI — grounded in ATO knowledge, not guesswork.
- Built for Australia
- ATO knowledge driven
- Explainable AI
- Audit ready
- BAS workflow
processing pipeline
- 01
CSV / PDF
Bank statement
- 02
Parser
Rows normalised
- 03
Merchant Recognition
Fuzzy + prefix match
- 04
Rule Engine
Deterministic first
- 05
ATO Knowledge
GST codes · BAS labels
- 06
GST Engine
Gross ÷ 11 · half-up
- 07
Confidence Engine
High / review band
- 08
Decision Trace
Reason + evidence
- 09ready
BAS Ready
1A · 1B · export
Why BAS Flow AI
Built for professional bookkeepers
A layered engine that reaches for AI only when rules and knowledge can't decide — so you get higher accuracy at lower cost.
02
ATO Knowledge Base
Official Australian GST treatments and BAS labels power every decision. GST is keyed on the account, not a model's guess — taxable, GST-free, and input-taxed handled correctly.
03
Learning Engine
Every correction a bookkeeper makes feeds back in. Merchant mappings and classifications improve future accuracy without retraining a black-box model.
04
Explainable AI
Every classification carries its reason, a confidence score, and a full decision trace. Nothing is opaque — audit-ready by design.
How it works
From bank statement to BAS-ready
Nine deterministic steps. Each one is inspectable, versioned, and logged.
- 01
Upload statement
Drop in a CSV or PDF bank statement. Rows are parsed and normalised into clean transactions.
- 02
Normalise merchant
Bank-feed noise like store numbers and cities is stripped, then matched against a merchant catalogue.
- 03
Apply rules
Priority-ordered, governance-aware rules classify the transaction to an account — deterministically.
- 04
Consult ATO knowledge
Each account is resolved against versioned ATO knowledge for its correct GST treatment and BAS label.
- 05
Calculate GST
The account's ATO GST treatment drives the calculation: gross ÷ 11, rounded half-up, mapped to 1A / 1B.
- 06
Confidence review
Each decision is scored into a confidence band, so low-certainty rows are flagged for a quick human check.
- 07
Generate decision trace
A full, append-only trace records the merchant match, rule hit, knowledge source, and reasoning.
- 08
Record audit trail
An append-only machine log captures every step, keyed by transaction, so the whole run stays reproducible.
- 09
Export BAS-ready data
Reconciled, labelled transactions export as JSON — ready for your BAS workflow and future Xero sync.
Features
Everything a bookkeeping engine needs
CSV Import
Structured bank exports
PDF Import
Scanned & digital statements
Merchant Recognition
Exact · prefix · fuzzy
GST Calculation
Account-driven, half-up
ATO Knowledge
Versioned GST & BAS codes
Learning Engine
Corrections improve accuracy
Audit Trail
Append-only machine log
Decision Trace
Reason + evidence per row
Confidence Scoring
High · review band
JSON Export
BAS-ready output
Rule Governance
Effective dates · entity scope
Xero Integration
soonOn the roadmap
Why our accuracy is higher
A pipeline, not a prompt
Generic AI tools pipe your statement straight into a language model and hope. We reach for AI only after rules and knowledge fall short.
Traditional AI
black boxCSV
↓
LLM
↓
Guess
BAS Flow AI
explainableCSV
Parser
Merchant
Rule Engine
ATO Knowledge
Learning
AI (only when needed)
Confidence
Review
Output
AI when needed. Rules when possible. Always explainable.
Dashboard
See every decision, and why
Real product output — merchant, account, GST, confidence, and the reasoning behind each classification.
statement_2026_q1.csv128 rows
knowledge v2026.1BAS ready
| Merchant | Account | GST | Confidence | Reason |
|---|---|---|---|---|
| OFFICEWORKS | 453Office Supplies | $4.55GST | High | Rule match · merchant_key |
| BP CONNECT 1423 SYDNEY | 449Motor Vehicle — Fuel | $8.18GST | High | Prefix match · fuel rule |
| WOOLWORTHS 2981 | 463Groceries & Basic Food | $0.00GST-FREE | High | Account-driven · GST-free |
| ATO PAYMENT | 820GST Payable | $0.00BAS-EXCL | High | Knowledge source · ATO |
| BANK FEE | 404Bank Fees | $0.00INPUT-TAXED | High | Input-taxed financial supply |
| SP * NORTHSIDE CAFE | 420Meals & Entertainment | $1.27GST | Review | Low confidence · needs check |
decision_trace›WOOLWORTHS 2981
merchant_normalised: woolworths→rule_matched: grocery_food→knowledge: account 463 = GST-free→final: $0.00 GST
98%+
Automatic classification
99%
GST accuracy
100%
Decision explainability
Indicative targets · to be replaced with live evaluation data
Security
Enterprise-grade security
Financial data deserves engineering discipline. Here's how we handle yours.
Local processing
Statements are parsed and classified within your environment — not shipped to a third-party model by default.
Encrypted storage
Data at rest is encrypted. Connections use direct, unpooled channels for sensitive operations.
Audit logs
An append-only machine log records every decision, keyed by transaction, for full traceability.
No training on your data
Your customers' financial data is never used to train models. Learning stays scoped to your workspace.
Privacy first
Built for Australian compliance expectations, with data handling designed around confidentiality.
Australian data residency
Your financial data stays onshore. Storage and processing are kept within Australian regions by default.
Pricing
Simple plans for every practice
Choose a plan and start automating your BAS bookkeeping today.
Starter
For solo bookkeepers getting started.
- CSV import
- Rule + GST engine
- Decision trace
- JSON export
Most popular
Professional
For busy bookkeepers running many clients.
- Everything in Starter
- PDF import
- Learning engine
- Confidence review queue
Accounting Firm
For firms needing scale and governance.
- Everything in Professional
- Team workspaces
- Audit exports
- Priority support
FAQ
Questions, answered
What banks are supported?
Any Australian bank that exports CSV statements works today. Bank-feed formatting — store numbers, city suffixes, and reference noise — is normalised automatically during merchant recognition.
Do you support PDF statements?
Yes. PDF bank statements are parsed into structured transactions, so you can process both digital and scanned exports without manual data entry.
How accurate is GST calculation?
GST is calculated deterministically from the account's ATO treatment — gross ÷ 11, rounded half-up to two decimals per line, and mapped to the correct BAS label (1A on sales, 1B on purchases). Taxable, GST-free, and input-taxed supplies are each handled correctly.
Can I review transactions before finalising?
Every transaction is scored into a confidence band. Low-confidence rows are flagged for a quick human check, so you stay in control while the engine handles the routine volume.
Can I export to Xero?
Today you can export BAS-ready data as JSON. Native Xero integration is on the roadmap.
How does the AI make decisions?
Rules and ATO knowledge decide first. AI is only invoked when deterministic logic can't classify a transaction — and even then, every decision carries a reason, confidence score, and full decision trace.
Is my data secure?
Statements are processed locally by default, data at rest is encrypted, and your financial data is never used to train models. An append-only audit log records every decision.
Our philosophy
AI when needed.Rules when possible.Always explainable.
Bookkeeping designed by engineers who understand accounting — built for the way Australian practices actually work.