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- Apr 14, 2006
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That explanation fits the pattern I have observed so far - $60 first month and $56 second month -- so I assume it is correct. Though it is a strange way to calculate it. As an aside, I note that there is also a bond calculator on the TD website under the "tools" tab. It is meant for paper bonds, but it works for electronic ones too. You don't need the serial number, but you do need to put in only $1000 for the bond amount and then multiply the result by 10 (apparently, you couldn't purchase a $10k face amount paper bond in December 2021). It also shows $116 in accrued interest as of today for an I-bond purchased in December 2021.
...
Looks like it is spreadsheet time to keep track of all these.
Or maybe not. This is linked in the reddit post referenced by Dabbler above (and misanman before that). It appears this guy has done the work for us.
http://eyebonds.info/ibonds/home10000.html
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