If “1099 bank interest” is referring to interest income reported on Form 1099-INT and you are both listed on the account, then you would each claim half of the interest income on your individual returns.

If “1099 bank interest” is referring to mortgage interest reported on Form 1098 and you are both listed on the mortgage, then you can decide among the two of you how to divide the mortgage interest deduction between your two tax returns.

If neither of these is the right interpretation of “1099 bank interest”, please add more details.