Yes, you could Efile without Form 8990 and later Amend your return to add it.
The only downside might be is if you have to pay more tax.
A taxpayer (including, for example, an individual, corporation, partnership, S corporation) with business interest expense; a disallowed business interest expense carryforward; or current year or prior year excess business interest expense must generally file Form 8990, unless an exclusion from filing applies.
Here's more info on Form 8990.
@samiam11
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