atomno-mcp-fns-calc
Offline Russian tax calculator MCP server: VAT, simplified tax, sole proprietor contributions, income tax, patent and penalties with Tax Code references
Install
uvx atomno-mcp-fns-calcOr pipx install atomno-mcp-fns-calc.
This is third-party code. Review the repository files before installing.
What it does
Six calculators run locally with no internet or key. The server adds or extracts VAT, computes the simplified tax on income or income minus expenses with the minimum tax and contribution deduction, and fixed sole proprietor contributions with the percentage above the threshold and partial years. It also covers progressive personal income tax with a per-bracket breakdown, patent cost and penalties at the central bank key rate. Each answer includes the formula, a Tax Code article reference and a disclaimer. Five INN status checks, such as self-employment or account blocks, work only through the author's paid hosted API.
Who it is for. Accountants, sole proprietors and small business owners who need quick tax calculations while working with an agent.
Good fit when
- You need to extract or add VAT for a contract amount
- You need to compare 6 and 15 percent simplified tax for projected income and expenses
- You need to calculate a late payment penalty
Not a fit when
- You need tax advice or a filed return
- You need free INN status checks: they are paid-tier only
Example request
Calculate sole proprietor contributions for 2025 at 2.4 million rubles income and compare simplified tax on income versus income minus expenses with 1.5 million expensesLimitations
Built-in rates and limits are a snapshot at package release and should be checked against the Tax Code. Fresh rates and status checks need the MCP_FNS_CALC_TOKEN key on a paid plan. Not affiliated with the tax service and no substitute for an accountant.
How to disable. Remove the fns-calc block from your MCP client config and uninstall with pipx uninstall atomno-mcp-fns-calc.
MCP
- Transport
- stdio
- Authentication
- not required
| Environment variables | |
|---|---|
| MCP_FNS_CALC_TOKEN secret | Paid plan key for status checks and fresh rates |
| MCP_FNS_CALC_TIMEOUT | HTTP timeout in seconds |
Security check
- Calculators run offline and change nothing
- With a key set, INNs are sent to the author's external service
README in short
The short Russian README lists offline calculators and paid INN status checks. It gives uvx and pipx launch commands and a Cursor and Claude Desktop config with an optional key. A tool table shows which run offline and which need the hosted API. It ends with a disclaimer that this is not tax advice. MIT license.
FAQ
Is internet access required?
Not for the six calculators and the rate snapshot. Network and a key are only needed for status checks and fresh rates.
Can I trust a result without checking?
No, the author states it is not advice. Check rates against the Tax Code; every answer cites the article.
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