Department of the Treasury Bureau of Fiscal Service announced the Bank of America Lockbox sites would cease operations for the IRS, effective December 31, 2020. Post office (PO) Box addresses for Individual taxpayers sending payments to Hartford, CT and San Francisco, CA for Form 1040, Form 4868, installment agreements (CPs 521/523), and 1040-Estimated Tax (ES) vouchers will be forwarded to Lockbox addresses in Louisville, KY and Cincinnati, OH. Permanent closure of the Hartford and San Francisco PO boxes will occur January 1, 2022 and any mail directed to those closed addresses beginning January 1, 2022 will be returned to the sender. Effective January 1, 2022, Post Office Box addresses, designated for payments, will be closed in San Francisco, California: If you filed forms… Post Office Box 1040 P.O. Box 7704 San Francisco, CA 94120-7704 1040ES P O Box 510000 San Francisco, CA 94151-5100 4868 P O Box 7122 San Francisco, CA 94120-7122 Installment Agreements P O Box 7125 San Francisco, CA 94120-7125 Effective January 1, 2022, Post Office Box addresses, designated for payments, will be closed in Hartford, Connecticut: If you filed forms… Post Office Box 1040 P.O. Box 37008 Hartford, CT 06176-7008 1040 P O box 37910 Hartford, CT 06176-7910 1040ES P O Box 37007 Hartford, CT 06176-7007 4868 P O Box 37009 Hartford, CT 06176-7009 4868 P O Box 37911 Hartford, CT 06176-7911 Installment Agreements P O Box 37004 Hartford, CT 06176-7004 Current Post Office Box addresses can be found on IRS.gov and in the IRS Publication 3891 PDF, Lockbox Addresses for 2021; or, Where to File Paper Tax Returns With or Without a Payment.