I moved from MA to MD in April 2010. I made a steady wage and my MA W2 taxes went to MA and my MD W2 taxes went to MD. I prorated my bank interest correspondly (essentially 1/4 MA, 3/4 MD, but it was aligned with the exact specifications and calculations).

However, here's where the issue is. Previously, I had carry-over loss in MA and applied the carryover loss to all of the dividends (e.g. $1000 dividends with a carry-over loss of $2500 results in $0 dividends and $1000 carryover loss applied to dividends, $1500 remainder). Now, in MA, you apply carryover loss to dividends *Before* any prorating of residence in MA. Therefore, I'm essentially paying 100% of my dividends to MA. This is all fine and dandy in MA, but makes it difficult when in MD because I do not want to be doubly taxed on my dividends. So I'm wondering if I adjust for this in MD Form 502 Line 5, Line 12, or Line 27?

Line 5. Other additions (code [A] and write -$1000)
Line 12. Income received during period of non-residence (write +$1000)
Line 27. ? Using MD 502CR?