Microrachunek Tax Generator

The tool generates a Polish mikrorachunek podatkowy (tax micro-account) from taxpayer identifiers such as NIP and optional REGON. It outputs a 26-digit micro-account used for tax payments to the Polish tax authority and, if provided, a payment reference. Target users include accountants, payroll teams, small business owners, and individuals who regularly remit taxes or advance payments. It is suitable whenever a recipient bank account must be established for tax flows with reproducible results.
Conceptually, the process normalizes identifiers, applies the official mapping algorithm published by KAS (Krajowa Administracja Skarbowa), and formats the result as a contiguous numeric string. Validation checks ensure all characters are digits, that the final length is 26 digits, and that repeated runs with the same inputs produce identical outputs. Optional inputs allow a reference number to be appended in a compliant way for reconciliation.
Key differentiators are government-aligned generation rules, offline determinism, and explicit formatting guidance without relying on live government APIs. The tool provides deterministic outputs, clear error messages for invalid data, and export-friendly formats (plain account string and optional reference). It supports reuse in accounting workflows and batch-ready processing with consistent results.
Typical use cases include VAT payments, PIT/CIT settlements, and other tax obligations that require a mikrorachunek. By removing manual calculation steps, the tool reduces transcription errors and speeds up onboarding for new finance staff. It is designed for professional use, with clear input validation, robust edge-case handling, and deterministic outputs for audit trails.