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1hotjava t1_jadj8ok wrote

There is no compounding on a T-bill.

You have to get more refined. Use days, not months. Include cents and fractions of a cent. You didn’t buy at $99.65, it’s like $99.65113 (or whatever, I didn’t look yours up for the exact)

See top of page 2 here:

https://www.treasurydirect.gov/instit/annceresult/press/preanre/2004/ofcalc6decbill.pdf

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