The federal does not tax state and local dividends so they are not included on lines 1a,b,c.
Line 4 with the reason codes is only used for income from line 1 that is not taxable to NH.
I also entered income in box 12 of 1099-DIV and it does not appear on the DP-10. Your form sounds correct. See DP-10 instructions here.
Thank you for explaining this so that it's clearer to me now. I do still have a question why I'm not able to enter two Reason Codes for the same dividend any more? I have some 1099-Divs with entries for both Reason Codes 1 and 3. This had been possible to enter in prior years using TurboTax. Now I can only enter the Reason Code that goes with the larger amount that is not taxable in NH. Your thoughts on this?
Big picture, as long as it is marked not-taxable, that works. Program wise, I am able to select Edit and make a choice for each entry.
Yes, but you can only enter one Reason Code per "Name of Payer'. Tried to enter the payer twice, to give it another Reason Code, and that causes an error. I've been able to enter 2 Reason Codes per payer in past years. Each Reason has a different non-taxable amount. Overall, it doesn't amount to much savings so I'm sending in my return soon. Thanks for your explanations!