Fortnox MCP server

Read from the package source without running it. The installed server may list more.

• fortnox_bookkeep_invoice

  Bookkeep an invoice, creating the accounting entries. Once booked, the invoice cannot be edited. Args: - document_number (string): Invoice document number to bookkeep (required) - response_format ('markdown' | 'json'): Output format Returns: Confirmation of bookkeeping with the created voucher reference.

• fortnox_cancel_invoicewrite action

  Cancel an invoice. Booked invoices will have reversal entries created. Args: - document_number (string): Invoice document number to cancel (required) - response_format ('markdown' | 'json'): Output format Returns: Confirmation of cancellation.

• fortnox_create_accountwrite action

  Create a new account in the chart of accounts. Args: - account_number (number): Account number 1000-9999 (required) - description (string): Account description (required) - vat_code (string): VAT code for the account - active (boolean): Whether the account is active (default: true) - cost_center_settings ('ALLOWED' | 'MANDATORY' | 'NOTALLOWED'): Cost center settings - project_settings ('ALLOWED' |

• fortnox_create_customerwrite action
• fortnox_create_invoicewrite action
• fortnox_create_supplierwrite action
• fortnox_create_voucherwrite action
• fortnox_credit_invoicewrite action

  Create a credit note for an invoice. This creates a new credit invoice referencing the original. Args: - document_number (string): Invoice document number to credit (required) - response_format ('markdown' | 'json'): Output format Returns: The created credit invoice details.

• fortnox_delete_accountwrite action

  Delete an account from the chart of accounts. WARNING: This action cannot be undone. The account must not have any transactions. Args: - account_number (number): Account number to delete (required) Returns: Confirmation of deletion.

• fortnox_delete_customerwrite action

  Delete a customer from Fortnox. WARNING: This action cannot be undone. The customer must not have any invoices or orders. Args: - customer_number (string): Customer number to delete (required) Returns: Confirmation of deletion.

• fortnox_delete_supplierwrite action

  Delete a supplier from Fortnox. WARNING: This action cannot be undone. The supplier must not have any invoices. Args: - supplier_number (string): Supplier number to delete (required) Returns: Confirmation of deletion.

• fortnox_get_account

  Retrieve detailed information about a specific account. Args: - account_number (number): The account number to retrieve (1000-9999, required) - response_format ('markdown' | 'json'): Output format Returns: Complete account details including description, VAT settings, and balances.

• fortnox_get_company_info

  Retrieve information about the company connected to this Fortnox account. Returns company name, organisation number, addresses, contact details, and other company information. Args: - response_format ('markdown' | 'json'): Output format Returns: Company details including name, organisation number, address, and contact information.

• fortnox_get_customer

  Retrieve detailed information about a specific customer. Args: - customer_number (string): The customer number to retrieve (required) - response_format ('markdown' | 'json'): Output format Returns: Complete customer details including contact info, addresses, payment terms, and VAT settings.

• fortnox_get_invoice

  Retrieve detailed information about a specific invoice including all line items. Args: - document_number (string): The invoice document number to retrieve (required) - response_format ('markdown' | 'json'): Output format Returns: Complete invoice details including customer info, dates, amounts, line items, and payment status.

• fortnox_get_supplier

  Retrieve detailed information about a specific supplier. Args: - supplier_number (string): The supplier number to retrieve (required) - response_format ('markdown' | 'json'): Output format Returns: Complete supplier details including contact info, addresses, bank details, and payment terms.

• fortnox_get_voucher

  Retrieve detailed information about a specific voucher including all accounting rows. Args: - voucher_series (string): Voucher series (e.g., 'A') (required) - voucher_number (number): Voucher number within the series (required) - financial_year (number): Financial year ID (defaults to current year) - response_format ('markdown' | 'json'): Output format Returns: Complete voucher details including a

• fortnox_list_accounts

  List accounts from the chart of accounts in Fortnox. Retrieves a paginated list of accounts with optional filtering. Args: - limit (number): Max results per page, 1-100 (default: 20) - page (number): Page number for pagination (default: 1) - search_description (string): Search accounts by description - from_account (number): Filter accounts from this number (1000-9999) - to_account (number): Filte

• fortnox_list_customers
• fortnox_list_invoices
• fortnox_list_suppliers

  List suppliers from Fortnox accounting system. Retrieves a paginated list of suppliers with optional filtering. Args: - limit (number): Max results per page, 1-100 (default: 20) - page (number): Page number for pagination (default: 1) - filter ('active' | 'inactive'): Filter by supplier status - search_name (string): Search suppliers by name (partial match) - response_format ('markdown' | 'json'):

• fortnox_list_voucher_series

  List available voucher series in Fortnox. Voucher series are used to categorize vouchers (e.g., 'A' for manual entries, 'B' for bank, etc.). Args: - response_format ('markdown' | 'json'): Output format Returns: List of voucher series with code, description, and whether manual entries are allowed.

• fortnox_list_vouchers
• fortnox_send_invoice_emailwrite action

  Send an invoice to the customer via email. The invoice will be sent to the email address configured for the customer. Args: - document_number (string): Invoice document number to send (required) - response_format ('markdown' | 'json'): Output format Returns: Confirmation that the email was sent.

• fortnox_update_accountwrite action

  Update an existing account in the chart of accounts. Args: - account_number (number): Account number to update (required) - description (string): Account description - vat_code (string): VAT code - active (boolean): Whether the account is active - cost_center_settings ('ALLOWED' | 'MANDATORY' | 'NOTALLOWED'): Cost center settings - project_settings ('ALLOWED' | 'MANDATORY' | 'NOTALLOWED'): Project

• fortnox_update_customerwrite action

  Update an existing customer in Fortnox. Args: - customer_number (string): Customer number to update (required) - name, email, phone, address fields, etc.: Fields to update (only provided fields are changed) Returns: The updated customer details.

• fortnox_update_invoicewrite action

  Update an existing invoice in Fortnox. Only unbooked invoices can be updated. Args: - document_number (string): Invoice document number to update (required) - rows (array): Updated line items (replaces all existing rows) - Other fields: Same as create_invoice Returns: The updated invoice details.

• fortnox_update_supplierwrite action

  Update an existing supplier in Fortnox. Args: - supplier_number (string): Supplier number to update (required) - All other fields from create_supplier (only provided fields are updated) Returns: The updated supplier details.

• Code scan35 source files scanned25/25
• –Live reliabilityno gateway calls yet and no remote to proben/a
• –Tool poisoningtools not inspected (local package is not executed); not countedn/a
• Auth qualitystatic API keys via environment variables6/15
• Maintenancelast push 156 days ago8/15
• Maintainer identityregistry namespace matches repository owner; GitHub account older than a year9/10

Safety score

74/100

higher than 48% of 1,761 Finance servers

Tools

28

the typical Finance server has 8

Tools that change things

54%

typical: 0%. Fewer write tools means less an agent can break

GitHub stars

41

more than 91% of 946 Finance servers

Downloads a week

71

more than 60% of 421 Finance servers with a package

Fortnox: common questions

Is Fortnox MCP server safe?

Mostly: it is graded B (74/100). Read the Fortnox safety report

How do I install Fortnox?

It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.

Does Fortnox need an API key?

Yes. The registry entry asks for FORTNOX_CLIENT_ID, FORTNOX_CLIENT_SECRET, FORTNOX_REFRESH_TOKEN.

Is Fortnox maintained?

The last commit was 190 days ago (2026-04-28). The latest release is v1.0.0.

What can I use instead of Fortnox?

Servers from other publishers that do the same job: E Arveldaja MCP server, OpenAccountants MCP server and Norman Finance — AI Bookkeeping, Accounting & Taxes MCP server.

How does Fortnox compare with other Finance MCP servers?

safety score 74/100 (higher than 48% of 1,761 Finance servers); tools 28 (the typical Finance server has 8); tools that change things 54% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.