Since this credit is calculated and applied automatically by TurboTax, rather than there being a specific screen for it, is it possible to adjust things so it will go on one spouse's return instead of the other? I'm assuming it's determined by the spouse with the higher income, but is that true?
No, it is not directly configurable within the TurboTax interface.
The Manitoba Family Tax Benefit is automatically calculated and applied in TurboTax based on the information provided in your tax returns. While TurboTax does not offer a specific screen to manually assign this credit to one spouse over the other, it is generally calculated by taking into account the family's total income and other relevant financial details. The determination of which spouse's return the benefit will appear on is indeed typically influenced by the spouse with the higher income, but it involves a more comprehensive evaluation of the overall financial situation of both spouses. Therefore, it is not directly configurable by the user within the TurboTax interface.