I have stock in a Canadian company whose US branch I used to work for. They mailed me an NR4 form for my interest last year. I'm trying to fill out my tax forms this year and the advice I keep seeing is to put it down as a 1099-DIV as 1b income after currency conversion. Do I put the same value down for 1a to keep the tax software from complaining?
Income code 09 is dividends, so yes - it is the same as line 1 of the US form 1099-DIV.
1a or 1b however depends on whether the requirements for qualified dividends are met. If they're met - its 1b, if not - 1a. These are treated and taxed differently.