Field Description - Tax - State Base Amount to Withhold
The Tax - State Base Amount to Withhold is the flat tax amount to withhold based on the Tax - State Gross Income Over Amount.
Example - Maine Single 
 Taxpayer:

If a single person's annual income is $7,500.00...
Gross Income Level = 2 (see table)
State Gross Income Over Amount = $6,850.00
State Base Amount to Withhold = $91.00
State Plus % of Excess Over Rate = 4.50%
$7,500.00 - $6,850.00 = $650.00 Excess Taxable Amount
Excess Taxable Amount $650.00 X % of Excess Over Rate 4.50% = Excess W/H Amount $29.25
State Tax Withholding Amount = $91.00 + $29.25 = $120.25
Tips:
This field is not applicable to all states.
For more information, see Understanding Tax Calculations.
Where-Maintained: State Withholding Tax Table Maintenance - Maine (W/Hx02), State Withholding Tax Table Maintenance - Oregon (W/Hx05)
Where-Used: Tax calculations
Format: 6.2 numeric