Deterministic calculations
Fixed-precision component calculations keep financial math outside the language model.
Inputs + outputs + lineage Tax decisions you can defend
Turn tax complexity into clear, reviewable decisions.
Explore calculations, rule evidence, and transaction history in your tax workspace. Tax research is being built around approved source evidence.
Versioned rules Deterministic math Source lineage
BASE-RATE SCENARIOOntario · HST
CA-ONTransactionFacts normalized
RuleEffective version
ResultComponent math
SubtotalCA$1,000.00
+HST · 13%CA$130.00
=Illustrative totalCA$1,130.00
Evidence attachedAuthority source · Rule version · Input snapshot
Tenant isolatedWorkspace-scoped data
ReproducibleEvery input preserved
Multi-tenant workspace Evidence-first workflow Effective-dated rules Professional review boundary
One controlled platform
From transaction facts to evidence in one workflow
Designed for finance teams, accounting practices, marketplaces, and operators who need speed without losing traceability.
AI research boundary
The base-rate can illustrate missing-fact guidance. Production answers stay disabled until approved tenant-scoped evidence content is ingested and retrieved.
Grounded production path is roadmapNexus intelligence
A planned workflow for tracking physical and economic signals, thresholds, and registrations.
Roadmap capabilityDocument intelligence
A planned review surface for invoices, exemption certificates, notices, and extracted facts.
Roadmap capabilityBulk operations
A future import workflow with validation, progress, retries, and row-level exceptions.
Roadmap capabilityCalculation history
Preserve transaction inputs, rule versions, component results, and evidence for later review.
Available in the base-rateDesigned for accountability
Evidence explains. Approved rules calculate.
Effective-dated rules and fixed-precision code remain the only source of calculated amounts. Any future model output will require approved evidence and professional review.
Capture facts
Start with amount, transaction date, jurisdiction, and exemption status.
Resolve a rule
Select an explicit jurisdiction rule and its effective version.
Calculate
Apply component rates with deterministic fixed-precision math.
Review evidence
Inspect the source, assumptions, limitations, and saved history.
Transparent base-rate scopeInspect the live rule library
A credible foundation, with honest boundaries.
The current calculator supports base-rate examples for six jurisdictions. It does not claim complete local-rate, nexus, product-taxability, filing, or legal-advice coverage.
United StatesCalifornia, New York, and Texas base-rate scenarios
CanadaOntario, British Columbia, and Quebec component scenarios
Security by design
Built around isolation, traceability, and least privilege.
TaxPilot implements secure sessions and organization-scoped access as the foundation for a production control plane.
Tenant-scoped accessUsers operate inside an explicitly selected organization.
Explicit authentication boundaryRegister your workspace and sign in with your email and password. Sessions remain isolated to your organization.
Reviewable lineageCalculations retain rule versions and authority links.
Safe defaultsStrict browser policy, rate limits, and bounded inputs.
TaxPilot workspace
Explore an explainable tax workflow.
Create your organization, run a supported calculation, and inspect its lineage.