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tillbooks

v0.0.0

Published

TILL (Trusted Independent Ledger Library) is a free, open-source (MIT), local-first Swiss accounting app where an AI agent posts entries, categorizes, drafts and chases invoices, and prepares the MWST-Abrechnung through a first-class MCP interface, with a

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Links

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Maintainers

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Keywords

accountingswissswitzerlandbookkeepingmcpmcp-serveragentagent-nativelocal-firstself-hostedopen-sourcedouble-entryledgerqr-billqr-rechnungmwstvatiso20022kmubexio-alternativeerp

Readme

TILL

Trusted Independent Ledger Library. Swiss accounting your agent can actually use.

TILL is a free, open-source (MIT), local-first accounting app built for Switzerland. Your books live in a single SQLite file on your own machine. They never leave the country, because they never leave your laptop.

The difference is the interface. Most accounting software is a GUI with an AI button bolted on. TILL is built the other way around: an MCP server is a first-class interface, so an agent can post entries, categorize transactions, draft and chase invoices, prepare the MWST-Abrechnung, and answer "how did my quarter go" by talking to the ledger directly. A minimalist Studio gives you human oversight of everything the agent did. Agent and human share one ledger.

Status: pre-alpha. The scaffold is up and the specs are written. Nothing here is ready to keep real books yet. Do not run your business on it.

Why

Switzerland has accounting software. It does not have accounting software an agent can drive, and the open-source option (Gäld) is AGPL, which forecloses an open-core model. TILL is a clean-room MIT rebuild aimed at the things that actually make Swiss books Swiss:

  • QR-bill (Swiss QR-Rechnung) with the structured-address standard
  • Three MWST rates (8.1%, 3.8%, 2.6%) and the MWST-Abrechnung that falls out of them
  • Kontenrahmen KMU seeded out of the box
  • ISO 20022 (camt/pain) for banking
  • de-CH and en from day one

The ledger is not negotiable

Posted entries are append-only and immutable. A correction is a reversing entry, never a destructive edit, exactly as real accounting works. Posting is idempotent: a double-post does not double-count. These are asserted in the test suite, not merely promised in a README.

Install

npm install -g tillbooks
till --help

The package is tillbooks. The command is till.

Documentation

  • Specs : the capability specs and the architecture reference
  • Design : the design law this project builds to
  • Naming : why it is called TILL, with the register evidence

License

MIT, Copyright (c) 2026 Nomadik GmbH. See LICENSE.

TILL is an independent project. It is not affiliated with, endorsed by, or derived from bexio AG or any other accounting vendor. It is a clean-room implementation built from public documentation.