If, for 2023, your investment income (line 36 of Schedule N) is greater than your investment expenses (lines 18 and 54 of Schedule N), you can reduce your net investment income by carrying the unused portion of the adjustment of investment expenses to line 252. The amount you carry to line 252 cannot exceed the difference between your investment income and your investment expenses.

Unused portion of the adjustment of investment expenses (line 70 of Schedule N)

The unused portion of the adjustment of investment expenses is equal to the total of the amounts entered since 2004 on lines 40 and 64 of Schedule N, minus the amount already used to reduce your investment income for a previous year.