Yes, Peppol supports self-billing. According to the Peppol BIS 3.0 specifications, self-billing is allowed within the Peppol framework, provided that the invoicing process complies with the rules and restrictions outlined in the European Standard EN 16931. In self-billing, the buyer, rather than the supplier, issues the invoice, and this process can be supported through Peppol’s infrastructure for electronic document exchange.

For more details, see the official Peppol documentation here.