If one lives in a state with no state income tax, the checkbox "A portion of these dividends is U.S. Government interest" doesn't matter, right?

[Chaz31]

And would be best, even if checking box is warranted, to not check it?

[SteamTrain]

Correct.  You don't need to bother.

It only makes a difference on a state tax return.

And even if one lives in a state with an income tax, if the $$ amount is small, it may not be worth the effort to calculate the US Govt $$ amount. 

Example: if it's only $20, and in a 5% state...you save yourself a whole $1 in state taxes.