When you have joint accounts ( and you do not live in a community property state) they can be divided in any way you can both agree on.
But you do need to account for the "tax form" (e.g. 1099-INT) that was received under the SS# of one of you. You do this by reporting all the income on your return, then taking a deduction for the "nominee" amount. After entering your tax form (1099-INT) in TurboTax (TT), you will next encounter a screen titled "Tell us if any of these uncommon situations apply". At that screen, check the box "I need to adjust the taxable amount". On the next screen, "Report Interest Adjustment", enter the amount that the other spouse will be entering on his/her return and check the box "I received all or part of this interest for someone else (I am a nominee)". TT will report the adjustment on Schedule B, so that only your share shows as net interest income.
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