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USOPTE - Marion County Indiana Local Tax Decreased After Switching to New Tax Engine

edited Apr 28, 2026 5:59PM in Payroll and Global Payroll Interface (GPI) 1 comment

Summary:

After switching from Vertex to USOPTE (US Oracle Payroll Tax Engine), we are seeing a decrease of approximately $2.33 in Marion County, Indiana local income tax (COIT) withheld for several employees. We are comparing before and after payroll runs and the drop is consistent across multiple employees assigned to Marion County, Indiana.

Content (please ensure you mask any confidential information):We are planning to go live with USOPTE and are currently running a payroll comparison between the previous Vertex-based tax engine and USOPTE results as part of our pre-go-live validation. We have identified a consistent decrease of approximately $2.33 in Marion County, Indiana local income tax (COIT - County Option Income Tax) withheld per employee per pay period after switching to USOPTE.

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