The amount of interest from US Gov't obligations isn't reported on a box of the 1099-DIV, but it comes in a separate sheet from Vanguard. It lists each of their mutual funds along with a percentage of income from US Gov't obligations. In my case it was 31.42% so I multiply box 1a by .3142 to get the amount that I enter into Turbo Tax after checking the box for "Some of the dividends were from US Government obligations." I've done this every year for this Money Market mutual fund, but this year Turbo Tax keeps it in a Needs Review state. It seems like a bug in the program.
