TurboTax uses the 1.38 multiple
(138%), because that's what the CRA uses to determine the taxable amount of
eligible dividends ("gross-up"). Non-eligible dividends are
"grossed-up" by 1.17 (117%). This amount is then used to calculate
the tax payable and the dividend tax credit at both Federal and Provincial
levels.
https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/tax-re...
