Hello, Smooth migration from YNAB 4 to GnuCash is not possible due to QIF interpretation mismatch between the programs. I wrote a tool that modifies the YNAB 4 exported QIFs so that they can be imported in GnuCash. Full readme and code is available here: https://github.com/galbarm/YNAB4toGnuCashMigrationTool