aus-accounting-mcp

claude mcp add --scope user aus-accounting -- uvx --from 'aus-accounting-mcp==0.7.1' aus-accounting-mcp

That connects Claude Code; it needs Python 3.14+ and uv, and no API key. Other clients.

Try one contribution · Next examples · MCP server · Components · Licence

Australian Accounting is a set of local tax and payroll calculation engines and an MCP server for Australian accountants and bookkeepers, and the developers who build tooling for them.

Nine engines (8 in Rust, 1 in Python) apply Australian tax and payroll rules to figures you supply. Aus Accounting MCP, a local Model Context Protocol server, gives an AI assistant the published Python releases of 6 of them; it loads none of the Rust crates yet.

Each tool returns a calculation, the facts it used and the matters it refuses to decide. The engines and the MCP server run locally: they read files you point them at, contact no service, write to no ledger and lodge nothing. Two boundaries sit outside that: an MCP host sends every tool argument and result to its model provider, and the optional LodgeiT adapter below makes bounded HTTP calls only when you enable it.

Missing facts stay unknown: a Payday Super row with a fund-receipt date but no matched_amount or remitted_amount evidences when the fund received something, not how much, so the checker leaves it UNKNOWN rather than ON_TIME and names the amount it needs (from payday-super-checker 0.1.7; 0.1.6 and earlier read that receipt as covering the whole SG amount and say so in a caveat). Supply the amount the fund received with every receipt date.

Results you can check, dated because sources and releases move:

• Division 7A. On 7 October 2026 the minimum yearly repayment function of the ATO's Division 7A calculator and decision tool and the div7a-loan-review Python 0.2.0 source agreed to the cent on 12,800 fabricated cases with no repayments, for 2019-20 to 2026-27. Its repayment code and rate table are unchanged to the published 0.3.2, but the comparison was not rerun on later releases or the unreleased Rust port. It covers the repayment figure only, not the calculator's interest or closing balance (record and limits).
• Payday Super. For wages paid on 30 July 2026, payday-super-check 0.2.3 gives a due date of 11 August 2026, because NT Picnic Day on 3 August is not a business day. The ATO's worked example gives the same date on the usual 7 business day path. Run and read 5 November 2026.
• MCP tools. Aus Accounting MCP 0.7.1, the published release, listed 22 local tools on 5 November 2026. The source on main defines 25: validate_abn, validate_acn and get_reviewed_rate are not yet released, and neither is the doctor command.

Commands for the Payday Super date and the tool count

The first command downloads a fabricated register, and row 4 of the second prints QE day 2026-07-30 due 2026-08-11. Its rows are late, so that command exits 2.

curl -sSLO https://raw.githubusercontent.com/ryanduguid/australian-accounting/main/packages/payday-super-checker/examples/quarterly_remittance_2026_27.csv

uvx --from payday-super-checker==0.2.3 payday-super-check quarterly_remittance_2026_27.csv --as-at 2026-11-05 -o report.csv

This asks the published server for its tools and prints the count, with jq installed:

printf '%s\n' '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-06-18","capabilities":{},"clientInfo":{"name":"check","version":"0"}}}' '{"jsonrpc":"2.0","method":"notifications/initialized"}' '{"jsonrpc":"2.0","id":2,"method":"tools/list"}' | uvx --from 'aus-accounting-mcp==0.7.1' aus-accounting-mcp | tail -1 | jq '.result.tools | length'

Start here: what each component is · MCP client setup · tool reference · scope, limits and examples

Try one contribution

All examples are synthetic, and accounting decisions stay with the reviewer.

Input: $120 super contribution for payday 6 August 2026, remitted 14 August, with no fund receipt evidence as at 20 August.

With uv installed, download the synthetic CSV as timely_remittance_no_receipt.csv. Open a terminal in that folder and run:

uvx --from payday-super-checker==0.2.3 payday-super-check timely_remittance_no_receipt.csv --as-at 2026-08-20 --confirm-remittance-only -o payday-report.csv

This downloads the pinned PyPI package without cloning the repository. It writes payday-report.csv in the current folder, replacing that file if it exists. Open the report to see the due date and verdict.

The confirmation acknowledges the missing receipt; it does not establish payment. Omit --confirm-remittance-only to see the same AT_RISK result with exit 2, which asks you to resolve or acknowledge that evidence gap.

Output: AT_RISK, due 17 August 2026; exit 0 acknowledges the remittance-only evidence, without proving timely receipt.

Read the 5-minute Payday Super case · Division 7A repayment case · MCP setup

The recorded public evaluation uses release 0.1.3. Follow its fixed revision and commands to reproduce that historical run; the quick trial above uses release 0.2.3, which, like every release from 0.1.7, requires an evidenced amount alongside a fund-receipt date.

Choose the next example

The next Australian Accounting example depends on the task:

For transaction GST coding, load the linked bas-preparation skill and its bundled transaction reference. They require row coverage and separate evidence for supply treatment, buyer credits and BAS attribution. Aus Accounting MCP does not provide a transaction GST classifier; its calculations or a control-account tie-out cannot establish correct tax coding. Missing facts remain unresolved for the authorised reviewer. The walkthrough explains instruction-file delivery to Codex, ChatGPT and Copilot without claiming equivalent tested behaviour.

Use Aus Accounting MCP

For the MCP server, install Python 3.14+ and uv, then configure your MCP client to run:

uvx aus-accounting-mcp

This starts a local stdio server; it waits for an MCP client rather than opening a web page. It requires no API key. Package installation downloads dependencies; the tools then use bundled data without network requests or record writes. The MCP host you connect it to is a separate boundary: it sends every tool argument and result to its model provider, so use fabricated data with a hosted model.

uvx keeps using the version it first downloaded, so a new release does not reach you on its own. To move to a release, name it in your client configuration, for example aus-accounting-mcp== from PyPI; uvx downloads it, and later launches reuse the cached copy without a download until the uv cache is cleaned.

Once