When C5 endpoint will be available Financial Administration?
Short answer
According to FAQ Financial Administration of the Slovak Republic The implementation of the C5 end point was planned for the third quarter of 2026. This is the planned deadline, not the confirmation that the production endpoint has already been launched. The current availability, technical specification and test conditions should therefore be verified in the latest official documentcii FS.
Pilot environment
It serves to verify formats, flows and responses.
Sharp operation
It shall only be used once binding parameters have been published.
Conditions and errors
The solution should follow both successful and unsuccessful attempts.
Verification
Schemes and interfaces shall be versed and monitored.
Conclusion
The FAQ of July 2026 planned the implementation of C5 to Q3/2026; actual start-up to be confirmed in the current technical documentscii Financial Administration.
FAQ Financial Administration of the Slovak Republic k e-invoice · Law No. 222/2004 Z. z. o VAT as effective from 1. 1. 2027
Not legal advice. Machine-translated answer, not yet manually reviewed. For the exact wording, see the Slovak original.