Taxes on US bond EFTs?

I think I screwed up. I own two funds that invest 100% in US Bonds; VANGUARD SCOTTSDALE FDS INTER TERM TREAS, and ISHARES TIPS BOND ETF. I "think" these are exempt from state taxes. Is that right?
I mistakenly assumed that would show on my 1099INT and download into my tax software; and I didn't have to do anything about it. Apparently I should have deleted the interest from my state return, but didn't.
If I am right about my error, can I amend my state return without amending my Federal return?
Thanks much.
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On Monday, March 11, 2019 at 5:54:04 PM UTC-7, Frustrated wrote:

Yes, U.S. Treasury and some agency (e.g. FICO) bond interest is not state taxable.

Yes, for example in California there is a line for such interest amounts on the "California Adjustments" part of form 540.
I do not know whether all tax software does not care of this, I would hope some tax software would at least prompt you for this. It should be in box 3 and not box 1 of the 1099-INT so I think it should be automatic in theory. You were not out in the weeds for thinking it should be automatic.
Steve
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On Monday, March 11, 2019 at 8:54:04 PM UTC-4, Frustrated wrote:

NY returns the govt bond interest must be entered on the subtractions section of the NY 201 return.
bw
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