Income Tax in Payroll

Hi,

I am new to payroll.

I have an issue wherein user said that tax on overtime exceeds the actual overtime.

I could find from PE51 that Wage type /400 is for income tax and some amount is deducted against it in Payslip.

Now I want to see for which wage types this income tax is to be deducted and at what rate?

Where in SAP can I see this?

With Regards

KP