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@kraut35 

The problem is that TTX only provides one place to enter accrued interest......and the software can't know whether you are referring to box 1 $$$  (corporate bonds),  Box 3 $$ (treasury bonds), or box 8 $$ (Muni bonds ).  

And thus the software simply applies those accrued $$ proportionately (and improperly)  among the box 1, 3, & 8 $$ amounts.

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Your solution for reporting it properly is this:  If your 1099-INT is a mix of box 1, 3, and 8 in any combination. And if you have accrued interest to report for bonds you bought.....Then the all the bond interest for that bond type should be removed from that 1099-INT and entered manually on its own 1099-INT, from the same broker.  

Example:  You bought a Treasury bond with accrued interest that you can report for 2022. The Treasury bond interest is reported in box 3,  but that 1099-INT also has box 1 and box 8 $$ on it.  You remove all of the box 3 $$ (and box 12, if any) and put box 3 (and 12) $$ on it's own 1099-INT before indicating the accrued interest paid for that bond.  IF you don't, the accrued interest will be divided up proportionately (and improperly)  among boxes 1, 3, and 8

.....same thing goes for box 1 ( and 11) bond interest,

......or box 8 (9 and 13) bond interest. 

...If bonds purchased and related to any of the boxes 1 or 3 or 8 don't have accrued interest to be reported, those $$ can remain on the same 1099-INT form.

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Clearer?

Some day TTX may get on the ball and provide separate accrued interest lines for each bond type on the follow-up page, so that one 1099-INT can always be used.