OSVcalc

cz.osvcalcPublished by osvcalc.czOfficial publisherv1.0.1Updated Oct 24, 2026

Czech OSVČ tax calculator: income tax, social and health insurance, VAT, paušální daň.

VerifiedStreamable HTTPWeb executableFinanceBusiness & Commerce

Overview

AI-generated overview

A remote Czech self-employed (OSVČ) tax calculator that lets an assistant compute 2026 income tax, social and health insurance, VAT status and regime options.

What you can do
Compute 2026 income tax, social and health insurance doplatek for a Czech OSVČ from amounts already paid and the person's situation, also returning VAT registration status, a regime comparison, next year's advances and a filing guide with an explanation in Czech (calculate_osvc_taxes). Look up every input field the calculator accepts, grouped as on the web calculator with the same labels and tooltip explanations, to explain an option before a value is chosen (get_field_guide).
When to use it
Useful when helping a Czech self-employed person estimate their 2026 tax and insurance balance, compare tax regimes, check VAT registration status, or understand what a calculator field means before entering a value.
Requirements
Remote streamable HTTP endpoint at osvcalc.cz; no authentication, environment variables or headers declared. Network access to the endpoint is needed.
Before you install
Results are calculations based on the inputs supplied and should be checked against official tax guidance before filing or paying. No credentials or write actions are declared.

Installation

In SourceWeft

  1. Open OSVcalc in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/cz.osvcalc%2Fosvcalc/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "osvcalc": {
      "type": "http",
      "url": "https://osvcalc.cz/api/mcp"
    }
  }
}

Tools

2

calculate_osvc_taxes

Calculate OSVČ taxes

Computes the 2026 income tax, social and health insurance doplatek for a Czech OSVČ (self-employed person), given what they've been paid so far this year and their situation. Also returns VAT registration status, a regime comparison, next year's advances, and a filing guide, with an explanation in the requested locale. Income counts when it's actually received into the account, not when it was invoiced (cash basis), so 'income' should only be what's been paid so far this year, and 'monthly' is a separate estimate of what's still expected between now and December. For example, income: 300000, currentMonth: 6, monthly: 50000 means 300 000 Kč has been received through June, and about 50 000 Kč/month is expected July through December on top of that. Call get_field_guide first if you need to explain an option to the user before they've decided on a value.

ParameterssavedincomelocalesoubehstatuscreditsinsurermonthlypaidNowinvoicesplatceDphtaxRegime+17 more

get_field_guide

Get OSVČ calculator field guide

Returns every field calculate_osvc_taxes accepts, grouped the way the web calculator groups them, with the same label and explanation shown in its tooltips. Use this to explain an option to the user before they've decided on a value, without running a calculation.

Parameterslocale

Version history

1
  1. v1.0.1LatestOct 12, 2026

Score

83% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts

    Declare a GitHub repository with a README, or serve resource_documentation in the OAuth protected-resource metadata.

  • LicenseNot applicable

    A hosted service is used under its provider's terms, so no license is expected here. This check is left out of the percentage.