When buying 1 month treasuries at Schwab do you earn interest between auction and settlement date? How does it work on auto-enroll? Never bought a treasury in my life but looks like I have to get started. Could use some help.
Answers

Using the last 4 week auction as an example, the Auction Date (09/15/22) is the date you commit to purchasing the specific T-Bill and amount. The Issue Date, or settlement date (09/20/22) is the date the money is withdrawn from your funding account. This is similar to the "T+3" settlement for a stock trade. The price of the T-Bill in this auction was 99.792333, so your account would be debited $ 9979.23 for a $ 10000.00 purchase. The Maturity Date (10/18/22) is when the funds from the matured T-Bill will be deposited back into your account. In this example, you would receive the full $ 10000.00 face value.
It is my experience that Treasury Direct pulls the funds a nano-second after midnight on the Issue Date and returns them a nano-second after midnight on the Maturity Date.
You will not earn interest on the T-Bill between the auction date and the settlement date, as you do not yet own the T-Bill. If the funding account is interest bearing, you will still earn interest on that account.
The Treasury auction result press release for this example can be seen here:
https://www.treasurydirect.gov/instit/annceresult/press/preanre/2022/R_20220915_1.pdf


https://thefinancebuff.com/treasury-bills-cd-money-market.html

On the issue date, the funds will be removed from the account being used to pay for those securities.
from TreasuryDirect Research Center, "Auction Issuance":
On issue day, the Treasury delivers securities to bidders who were successfully awarded securities in a particular auction. In exchange, Treasury charges the accounts of those bidders for payment of the securities. Issue days vary by security.
[snip]
On issue day, payment is received and securities are simultaneously issued in an account previously specified by the bidder.
https://www.treasurydirect.gov/indiv/research/indepth/auctions/res_auctions_iss.htm

I assume you are also asking about auto-roll. While I have not utilized that feature, I’m pretty sure it’s straightforward. The typical maturity date for 28 day bills is also on Tuesdays. Schwab would enter your like notional amount order in the auction on the Thursday prior to its upcoming Tuesday maturity and the settlement of the new purchase would align with the maturity. The net result is on the auto-roll settlement day you would have a net credit to your account for the interest accrual for the maturing bill.






I have never used autoroll and I don't think it would let me in my IRA as I don't have the free funds to even buy a 9-22 settlement despite the fact that one matures on 9-20
In my regular account I can
I do wonder how much work I am creating for myself at tax time given that these are zeros
Does EVERY Treasury have to be listed at cost and maturity and how will my tax return know they are not subject to state income taxes



By the way - bought a 6 month that appears to pay just under 3.9%
Fidelity would like to inform you of an event that has occurred on one of the securities which you hold in your portfolio.
The below security was affected by a Full redemption:
Security Description : UNITED STATES TREAS BILLS ZERO CPN 0.00000% 09/20/2022

Did you buy them in the auction or in the secondary market?
The 26 week T-Bill at the last auction (09/19) was 3.907% @ 98.089 (CUSIP 912796U31).

100-98.089 =1948x2=3896%
But its not worth arguing about
I was unable to buy in my IRA because I did not have the cash in my account a few days ago but I do now
(one matured today)
So now I have to wait for another auction to put that ira money back to work
Nothing available today except a 20 year I think

Settle on 9-27
UNITED STATES TREAS BILLS ZERO CPN 0.000
-- 10/25/2022 -- -- -- 2.408 Yes -- 09/27/2022 CP SFP
RI
UNITED STATES TREAS BILLS ZERO CPN 0.000
-- 11/22/2022 -- -- -- 2.752 Yes -- 09/27/2022 CP SFP
RI
UNITED STATES TREAS BILLS ZERO CPN 0.000
-- 01/24/2023 -- -- -- 3.399 Yes -- 09/27/2022 CP SFP


I bought some of the 4 or 8 week (i forget which) too but it has not priced yet despite settling on the same day

https://www.treasurydirect.gov/instit/annceresult/press/preanre/2022/R_20220919_2.pdf