After you file

TAS?  The IRS messing up your I-Bond purchase may be a blessing in disguise as I-Bond rates are going to fall soon as of May 1, 2023.  I'm guessing the rate will be just below 4% so you might be better off just investing in a 5% CD.  With I-Bonds you have to stay invested for five years.  If you withdraw early you give up three months of interest.