Claiming an exemption in Part 6 and answering Yes to the question at line line 605 triggers error 1720.
known issue SERs EFILE error UHTTo resolve this error, answer Yes to the first-time filer question on the Info worksheet for any T1 return sent to the CRA for the very first time.
EFILE errorFirst-time filer's name and the BC renter's tax credit.
EFILE error T1The spouse’s or common-law partner’s income is not being considered by the system in the calculation of the Ontario Seniors Care at Home Tax Credit.
EFILE errorSome 2021 T1 returns trigger EFILE error Y80010 when the taxpayer has a partnership farming operation and claims the tax credit on the T2043.
EFILE error CRA T1