Apparently, TurboTax did not add the necessary amendments to my tax return regarding the $400 work from home expenses.
Although I checked yes on box "Will you claim employment expenses for working at home due to COVID-19 for income on this T4? NEW!" TurboTax didn't prompt me to enter further information, so I left it as is believing it had manually added the $400. However, on line 22900 it shows as $0
How do I edit my return on TurboTax Online.
