"Yet the IRS released 8990 and its instructions last December"

But there was a little change called the CARES Act that changed F 8990.  

THAT change hasn't yet been implemented, by the IRS and therefore, by Intuit.

Whether you can override that diag & still file is unknown.   I may try tomorrow; I have a return with a measly $ 160 that this issues is holding up the fiing.

I just found this... maybe it's a work-around?

https://proconnect.intuit.com/community/business-tax-credits-and-deductions/help/generating-form-899...

Thanks.  In my case, the excess  business interest (all $300) came in from a partnership K-1, and I was under the impression that partnerships weren't impacted by this CARES act provision.  

Please let me know about whether the e-filing works (and the return is accepted by the IRS) with errors disabled.  My client's return is 93 pages - that's a lot to mail!

Will do... mine's is flowing from a partnership too.  And it's probably 220 pages, plus three states.  AND she always owes, and wants the payment directly debited.  

I so do NOT want to paper file this one 😂

Using today's Lacerte version, I was able to suppress the critical diagnostic, and e-file.  The e-file was accepted by the IRS.  So I guess this is a workaround!

I'm just now rebooting to check.

Pretty crappy, low-end way to "fix" it.... but I'll take it !!