tax-engine

Open-source personal income tax calculation engine in Python. Every number is a tax-form line, and every result explains itself in a readable trace.

Open-source practice management & ITR preparation for Indian CA and tax offices: deterministic AY 2026-27 income tax engine, statute-cited rules, validation, reviewer sign-off. Next.js, TypeScript, Supabase + RLS.

Starter kit open source para automatizar la Declaración de Renta de Personas Naturales en Colombia (Formulario 210 - DIAN): motor de reglas tributarias parametrizable, wizard de captura, carga masiva y panel admin. FastAPI + React + PostgreSQL. Punto de partida para devs y contadores, siempre con validación de un Contador Público.

Deterministic AI-agent tax calculation engine: rules-as-data YAML plugins, zero-knowledge Fraction core, out-of-scope refusal, dual-path self-verification. LLM orchestrates; the engine computes. China 12.5/18 taxes + US/EU/JP samples.

Deterministic personal tax engine — LLM document ingestion in front, pure-code computation in the middle, official-form output at the back. (Greek τέλος: completion, purpose — and the ancient word for tax.)

Statutory GST compliance, automated HSN classification, and multi-tenant tax invoice generation system.

A deterministic real-estate property tax engine with provenance-gated recommendations: it refuses to recommend when a load-bearing input is missing. Includes a two-pass extraction and reconciliation pipeline and an evaluation harness with recorded cassettes for CI gating.

Documento tecnico del nucleo de gestion de ZOE: multi-tenant, ciclo de proyecto, motor tributario colombiano, costos y reparto entre socios

TypeScript EU VAT (incl. Ireland) and sales tax rules engine with double-entry ledger, idempotency keys and property-based tests