Code of Federal Regulations Title 31. Money and Finance–Treasury § 31.363.37 How do I purchase and make payment for eligible Treasury securities through my TreasuryDirect® account?

(a) Online purchase. Purchases of eligible Treasury securities through your TreasuryDirect account must be made online.

(b) Payment for savings bonds and marketable Treasury securities. You can pay for eligible savings bonds and marketable Treasury securities by either a debit from your designated account at a United States financial institution using the ACH method, or by using the redemption proceeds of your zero-percent certificate of indebtedness. You can pay for savings bonds automatically using the redemption proceeds of your payroll zero-percent certificate of indebtedness through the payroll savings plan.

(c) Payment for zero-percent certificate of indebtedness. You can pay for a zero-percent certificate of indebtedness by:

(d) Payment for a payroll zero-percent certificate of indebtedness. The only method available to purchase a payroll zero-percent certificate of indebtedness is to arrange for your employer or financial institution to send a credit by the ACH method to purchase a payroll zero-percent certificate of indebtedness in your TreasuryDirect® account.