Russian tax calculators (VAT, USN, NDFL) and FNS fiscal-status checks via MCP.
MCP MCP server exists for a simple reason — assistants are far more useful when they can act on MCP directly instead of describing what you should do. Russian tax calculators (VAT, USN, NDFL) and FNS fiscal-status checks via MCP.
MCP-сервер (Model Context Protocol) для бухгалтеров, ИП и малого бизнеса. 6 калькуляторов работают локально и офлайн, без ключа, с формулой и ссылкой на статью НК РФ: calc_vat (НДС 20/10/0 и спец-ставки 5/7), calc_usn (доходы 6% и доходы-минус-расходы 15% с минимальным налогом и вычетом взносов), calc_insurance_ip (фиксвзносы ИП + 1% с дохода свыше 300 000 ₽, неполный год), calc_ndfl (прогрессивная шкала 2025+ 13/15/18/20/22% с разбивкой по ступеням), calc_patent (ПСН), calc_penalty (пени по ключевой ставке ЦБ, 1/300 и 1/150). Плюс get_rates — актуальные ставки и лимиты.
Once MCP is connected, these are the calls the assistant has available:
MCP_FNS_CALC_TOKEN — API-ключ (тариф Pro) для live-проверок статусов и свежих ставокMCP_FNS_CALC_API_BASE — Базовый URL hosted-бэкендаMCP_FNS_CALC_TIMEOUT — Таймаут HTTP, сек (default 30)calc_vat — офлайнcalc_usn — офлайнcalc_insurance_ip — офлайнcalc_ndfl — офлайнcalc_patent — офлайнcalc_penalty — офлайнget_rates — офлайн/hostedcheck_selfemployed — hosted (Pro)check_ip_status — hosted (Pro)You will need one environment variable: MCP_FNS_CALC_TOKEN. The server will not start without them, which is usually why the tools fail to appear on a first run. Keep credentials in your client's env block or a secrets manager rather than in a file you might commit.
Being a remote server, there is no local install. You register the endpoint with your client, authorise it once, and the tools appear.
Plenty of developer tooling servers cover similar ground. The differences that matter in practice are scope of access and how much setup stands between you and a working tool call. MCP's toolset — MCP_FNS_CALC_TOKEN, MCP_FNS_CALC_API_BASE, MCP_FNS_CALC_TIMEOUT and 11 more — is a fair guide to whether it matches your workflow. It is maintained by atomno-mcp; worth a glance at recent repository activity before you build anything load-bearing on it.
We check each listing at SyncDev against the project's documentation before it goes live — if something here drifts out of date, it is a bug worth reporting.
| Tool | What it does |
|---|---|
| MCP_FNS_CALC_TOKEN | API-ключ (тариф Pro) для live-проверок статусов и свежих ставок |
| MCP_FNS_CALC_API_BASE | Базовый URL hosted-бэкенда |
| MCP_FNS_CALC_TIMEOUT | Таймаут HTTP, сек (default 30) |
| calc_vat | офлайн |
| calc_usn | офлайн |
| calc_insurance_ip | офлайн |
| calc_ndfl | офлайн |
| calc_patent | офлайн |
| calc_penalty | офлайн |
| get_rates | офлайн/hosted |
| check_selfemployed | hosted (Pro) |
| check_ip_status | hosted (Pro) |
| check_disqualified | hosted (Pro) |
| check_account_block | hosted (Pro) |
{
"mcpServers": {
"fns-calc": {
"command": "uvx",
"args": ["atomno-mcp-fns-calc"],
"env": {
"MCP_FNS_CALC_TOKEN": "your-value"
}
}
}
}Add to claude_desktop_config.json, then restart Claude Desktop.
| Variable | Description | Required |
|---|---|---|
| MCP_FNS_CALC_TOKEN | Credential the server authenticates with. | Yes |
Kill hallucinated APIs — version-accurate, up-to-date library documentation injected straight into context.
Microsoft's official browser automation server — drive a real browser through the accessibility tree, no screenshots needed.
GitHub's official server — repos, issues, pull requests, Actions and code security, straight from your assistant.
Issue tracking at the speed of conversation — Linear's official hosted server with OAuth and zero install.
Local repository surgery — status, diffs, commits, branches and history for any repo on disk.
Timezone sanity for AI — current time anywhere and correct conversions, without the model doing date math.