IRS Transcript - 6166(a) Non-Deferred Tax Underpayment on Form 4768

Section 6166(a) Non-Deferred Tax Underpayment on Form 4768, note 1:  The estate tax return was timely filed on the extended return due date of May 9, 2019. The TC 150 records the amount of tax assessed pursuant to this original return (as adjusted by any math error corrections that might have been determined by IRS) and establishes the Tax Module for the estate account. Only one TC 150 will post to an estate tax account. Supplemental estate tax returns will each generate TC 971 with TC 976.

The subsequent posting date of the TC 150 assessment (July 10, 2019) reflects passage of internal processing time between the date the return was received by IRS, the date the account was established, and the date the math verified amount of tax reported on the return was assessed. It therefore does not reflect the actual return filing date.