Accounting offices cannot grant themselves access to a client's KSeF account, so clients trying to hand off e-invoicing entirely are hitting a wall the system was built to enforce.

KSeF requires the business itself, not its accountant, to authorise the accounting office inside the platform; the office has no way to log in with a client's credentials or assign itself rights. On top of that, firms are finding a PDF copy and the KSeF structured invoice side by side and asking which one counts, a mix-up that leads straight to double-booked entries and VAT errors.