KSeF
How connect Subiekt123 to KSeF by a certificate
Open Subiekt123 in your browser Log in to Subiekt123 with your InsERT account (Konto InsERT). In the upper right corner of the window, click on the KSeF icon. Click on the "Konfiguracja"(Configuration) menu, then select the "Połączenie z KSeF" ...
How to connect SCANYE to KSeF by a certificate
Log in to SCANYE https://app.scanye.pl In the pop-up window, select the "Certyfikat KSeF" (KSeF Certificate) option instead of Token! Upload the KSeF certificate *.crt and *.key files (1, 2). Enter the password used when creating the certificate (3) ...
How to request your KSeF certificate
Log in to the KSeF application https://ap.ksef.mf.gov.pl/ Please use this link to log in. Log in with Profil Zaufany If you choose another method to log in, the process may be different. Enter the tax ID number of the company you are acting on behalf ...
KSeF - SCANYE - Subiekt123 full guide to integration from February 2nd, 2026
Log in to the KSeF application https://ap.ksef.mf.gov.pl/ Please use this link to log in. Log in with Profil Zaufany If you choose another method to log in, the process may be different. Enter the tax ID number of the company you are acting on behalf ...
Self-billing with a foreign contractor
On December 9, 2025, new Regulations of the Minister of Finance and Economy concerning situations in which there is no obligation to issue structured invoices, i.e., invoices to KSeF, were published in the Journal of Laws of the Republic of Poland, ...
Acceptance of invoices from KSeF – SCANYE new edition after November 25, 2025.
After integration with KSeF, SCANYE will display all invoices that have been issued and sent to KSeF by the office's Client or for the office's Client. Integration guide In the section „Pliki” ("Files, curently „Wysłane” - „Sent") a new column will ...
SCANYE is changing—new release after November 25, 2025.
SCANYE is changing to enable us to fully integrate with KSeF, which is essential for our clients to work with our office in the new legal environment. KSeF integration The KSeF integration feature with SCANYE will be available again via a generated ...
Test - Pre-production - Production Environment
In this article, we describe the differences between the so-called KSeF 2.0 environments during development. TEST environment (test) available from November 3rd, 2025 The test environment is used to test new KSeF 2.0 API functionalities. Documents ...
About Certificates and KSeF 2.0 – an introduction
Schedule – when do we have to switch to online invoicing? Issuing invoices in KSeF will be mandatory from February 1, 2026, for entrepreneurs whose sales value (including tax) exceeded PLN 200 million in 2025. Currently, we can voluntarily use KSeF ...
Connecting Subiekt123 with the National e-Invoice System
Log in to Subiekt123 using your Insert account. https://app.subiekt123.pl/ Go to the “ Configuration” menu in the lower left corner. Next go to „Krajowy System e-Faktur” You will see a window with the following information: „Integracja z Krajowym ...
Essential information before the mandatory KSeF
From February 1, 2026, the National e-Invoice System (KSeF) will become the main tool for issuing invoices in Poland. However, it is worth knowing that there are exceptions where invoices can still be issued outside of KSeF: OSS (one-stop shop) ...
Instructions for logging into KSeF for the first time
KSeF integration in SCANYE is temporarily unavailable. If you have already connected KSeF to SCANYE, you can continue to use it. Invoices issued in SCANYE can still be sent to KSeF. Invoices received in KSeF will still appear in SCANYE. We ask our ...