After several changes in tax law this year, the government is proposing further ways to improve the system. From January 1st, 2020, an invoice for a service can only be issued if the client’s tax identification number is on the sales receipt. The new regulations do not apply to clients who make purchases as private … <a href="https://arpiaccounting.com/en/sale-receipt-with-tax-identification-number-in-poland-nip-from-january-1st/">Continued</a>