Suggestions
Spouse Location, and separate taxation of partners
PL has the concept of Location (for better tax calcs), including the ability to set up a starting location in the About Me section…
…however this assumes that for a Joint account, both Me & Spouse live in the same Location. In the scenario where Me & Spouse start the plan as being single, and then get married X-yrs into the plan, Spouse could be living in a different location than Me.
Spouse should have their own Location setting for proper tax cals of Spouse details. Upon Marriage, PL can be informed where a Joint location would be…either as part of the configuration of the Marriage expense item (ask for joint location when ‘update status to married’ checkbox is enabled), or as part of the configuration of a ‘Get Married’ milestone.