obolus

Calculate take-home pay and compare salary outcomes across eight countries with Obolus.

CommunityOnlineNo sign-inGlobalFreeRead-only

What it can do

  • Berechne: Calculate detailed payroll and net salary for one country and person. Use this for tax class, region, health insurance, pension, deductions, or other country-specific inputs. For the same gr
  • Taxcompare: Compare annual gross, net pay, taxes, and employee social contributions across two or more supported countries. Use shared_gross for the same offer and local_median_gross for country-marke

What data it sees

Do you need an account

No: the server works without sign-in

Calculate take-home pay and compare salary outcomes across eight countries with Obolus.

The server offers two read-only tools:

  • berechne — calculate detailed payroll, taxes and employee contributions for one country.
  • taxcompare — compare net pay for the same gross salary or each country’s local median salary.

Supported countries: Germany, Austria, Switzerland, United States, United Kingdom, Ireland, Canada and Australia.

Public calculations require no account or API key. Results include assumptions and are intended for financial orientation, not individual tax advice.

How to connect

How to connect obolus to Claude

The server address to paste into Claude settings:

https://obolus--dbaehrle.run.tools

  1. Open Claude (claude.ai or the desktop app).
  2. Go to Settings → Connectors.
  3. Click Add custom connector.
  4. Paste the server address copied below into Remote MCP server URL and click Add.
  5. In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect obolus to ChatGPT

The server address to paste into ChatGPT settings:

https://obolus--dbaehrle.run.tools

  1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
  2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
  3. Open Settings → Connectors and click Create.
  4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
  5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
  6. In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect obolus to Cursor

The server address to paste into Cursor settings:

https://obolus--dbaehrle.run.tools

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

  1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
  2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
  3. Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (2)

Raw names from tools/list. Only developers need these.

berechneCalculate detailed payroll and net salary for one country and person. Use this for tax class, region, health insurance, pension, deductions, or other country-specific inputs. For the same gross salary across two or more countries, use taxcompare. Use semantic fields where available; legacy fields remain REST compatibility inputs. Monetary fields in the legacy request are minor units and period-specific.
taxcompareCompare annual gross, net pay, taxes, and employee social contributions across two or more supported countries. Use shared_gross for the same offer and local_median_gross for country-market benchmarks. Provide tax_year and at least two countries. Use berechne for detailed single-country payroll.