@GeoffreyG I am also having problems inputting the qualifying 12 month period. My start date is 07/29/2018, so I put 07/30/2019 as my end date. However, when I click 'continue', TurboTax keeps telling me to put in a valid end date because it's not 12 months after the start date. I tried inputting '07/29/2019', '07/31/2019', and other dates but keep getting the same error. What am I doing wrong?
