Gesthos TVA

Web application for VAT management that lets businesses handle their purchase and sales invoices, monitor tax obligations, and file VAT declarations in a structured, fully traceable way.

Why Gesthos TVA exists

For many small businesses, VAT season means spreadsheets: collected and deductible amounts reconciled by hand, declarations rebuilt from memory, and past filings buried in folders. Gesthos TVA turns that into a single workflow where every declaration traces back to its source documents — and survives an audit.

Features

Accounting Documents: Purchase/sales entries with automatic VAT & TTC computation
4-step Declaration Flow: Selection, adjustment, summary, validation
Dashboard & Statistics: KPIs, monthly trends, declaration history table
Legal Archiving: Filed declarations close their period and stay retrievable
FEC Export: Generates a Fichier des Écritures Comptables, the legally required format for accountants and auditors
Multi-company: Admin manages companies and users; users see their own data only
CSV/PDF Export: Export documents and generate declaration PDFs

The declaration flow

Step	Focus	Result
1 · Selection	Gather the period's purchase and sales documents	Complete document set
2 · Adjustment	Reconcile VAT collected vs deductible, correct entries	Validated amounts
3 · Summary	Review totals per VAT rate before filing	Declaration preview
4 · Validation	Lock the period and file	Archived declaration + PDF

Each validated declaration keeps its link to the underlying documents, so the answer to "where does this number come from?" is always two clicks away.

Built for compliance

Closed periods are archived rather than deleted, and the FEC export produces the standard accounting file that chartered accountants expect. Accounts are provisioned by an administrator instead of open self-signup, which keeps every company's fiscal data isolated behind the multi-company model.

Tech Stack

TanStack Start
TypeScript
Prisma (PostgreSQL)
shadcn/ui
Better Auth
TanStack Query
Recharts
Zod