Hi TaxGuyBill,

Thanks to your code section, I found exactly what I need in this sequel:

§6428. 2020 Recovery rebates for individuals (f) (3) (A) Timing
The Secretary shall, subject to the provisions of this title, refund or credit any overpayment attributable to this section as rapidly as possible. No refund or credit shall be made or allowed under this subsection after December 31, 2020.

Cheers!