io.github.lukasschwarz/elster-mcp-server

Automate ELSTER tax portal tasks, filings, return prep, and inbox syncing.

Source

Official Registry

Updated

2026-06-27

// securityCaution

Requires keys· ELSTER_CONFIG_PATH, ELSTER_PFX_PATH, ELSTER_PASSWORD, ELSTER_TAX_NUMBER, ELSTER_STATE_CODE, ELSTER_NAME, ELSTER_FIRST_NAME, ELSTER_STREET, ELSTER_HOUSE_NUMBER, ELSTER_ZIP, ELSTER_CITY, ELSTER_COUNTRY, ELSTER_HEADLESS, ELSTER_EST_SKIP_EUR
Runs locally
Official / curated
Open source
Community-trusted

Running security audit…

Credentials
Network egress
Code execution
Data access
Supply chain

// install

Copy the install command and let the AI configure it · recommended for beginners

Please install the "io.github.lukasschwarz/elster-mcp-server" MCP server from askskill:
Run: claude mcp add 'io-github-lukasschwarz-elster-mcp-server' -- npx -y elster-mcp-server

// examples

Submit VAT advance return

Prompt

Please submit this month's UStVA via ELSTER. Revenue is EUR 12,500 and input tax is EUR 980. Provide a pre-submission checklist and the submission result.

Expected

Provides a pre-filing review, completes the UStVA submission, and returns the filing status or receipt summary.

Prepare EUER/ESt tax materials

Prompt

Using the following annual income and expense data, prepare the EUER and ESt filing content required by ELSTER and list any missing fields: income EUR 86,000, office expenses EUR 4,200, travel expenses EUR 1,800.

Expected

Creates an ELSTER-ready tax draft, flags missing information, and reports the filing preparation result.

Sync tax inbox

Prompt

Log in to the ELSTER inbox, sync new messages and notifications from the last 30 days, and generate a summary by date, subject, and whether action is needed.

Expected

Returns the inbox sync result and produces a prioritized summary of messages and required follow-up actions.