Can I convert my client's plan from Capped to Flexi-access drawdown online?

Yes, this is possible by accessing one of the Post-retirement accounts to be converted and clicking on "+" next to "Income Maintenance" The option to convert will appear. Note that the system prompts explain the scenarios where the plan is not available to convert (trades in flight, dividend distribution in flight, income in flight etc.). A move from capped to flexi-access drawdown will trigger the money purchase annual allowance.