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USPS Process Guide –
Chapter 9: Deductions –
HMSU1 – Setting Up a 457/403(b) Vendor

Screen: HMSU1
Prerequisites: ERS manages 457 vendors, authorized agencies manage their 403(b) vendors.
Key Fields: AGENCY, PLAN ID, VENDOR ID, EFFECTIVE FROM DATE
Step Action
1 Access HMSU1.
2 Enter I in the SUBCOMMAND field.
3 Enter the following fields as required:
AGENCY (Key)
0 ERS Managed 457 vendors
XXX Agency number for 403(b) vendors
PLAN ID (Key)
403 403(b) vendors
457 457 vendors
VENDOR ID (Key)
Enter the four-digit vendor identification number. These are agency specified for 403(b) vendors and specified by ERS for 457 vendors.
EFFECTIVE FROM DATE (Key)
Enter the effective date of new vendor.
VENDOR REPORT NAME (Required)
Enter the vendor’s short name or report name.
TINS NO (Required)
Enter the 14-character vendor identification number assigned by the Texas Identification Number System (TINS).
VENDOR FULL NAME (Required)
Enter the vendor’s full name.
VENDOR ADDRESS (Optional)
The vendor’s address, row 1, 2, 3 or 4.
VENDOR STATUS (Required)
Enter A.
PRODUCT SELECTIONS (Optional)
Indicating at least one product with a Y in the Product Selections section is required. Fields left blank default to N after processing.
4

Press Enter to process the transaction. Employee entry may proceed on HN1UA.

Note: Deferred Compensation 457 contributions are FTP’d to ERS with every final payroll that has a 457 contribution or loan.