The above code is wrong and generates errors. The fix I found to work is to 1.) Ensure Utah WIthholding Salary Rule follows sequentially the Gross Salary calculation, then 2.) Insert the following python script (check for correct indentation, etc.):

# Get basic parameters
gross_income = categories['GROSS']

# Determine pay frequency from the payslip structure
if payslip.struct_id.schedule_pay == 'monthly':
    pay_periods = 12
elif payslip.struct_id.schedule_pay == 'semi-monthly':
    pay_periods = 24
elif payslip.struct_id.schedule_pay == 'bi-weekly':
    pay_periods = 26
elif payslip.struct_id.schedule_pay == 'weekly':
    pay_periods = 52
else:
    pay_periods = 24  # Default to semi-monthly

# Try to get the values, default if not available
try:
    allowances = contract.ut_allowances
except:
    allowances = 0

try:
    filing_status = contract.ut_filing_status
except:
    filing_status = 'single'

# Calculate annual income estimate
annual_income = gross_income * pay_periods

# Personal exemption and deduction calculation
standard_deduction = 0
if filing_status == 'single' or filing_status == 'married_separate':
    standard_deduction = 14600  # 2025 standard deduction for single filers
elif filing_status == 'married_joint' or filing_status == 'head_household':
    standard_deduction = 29200  # 2025 standard deduction for married filing jointly

# Calculate taxable income
taxable_income = max(0, annual_income - standard_deduction - (allowances * 4590))

# Utah uses a flat tax rate of 4.65% (as of 2025)
annual_tax = taxable_income * 0.0465

# Convert annual tax to per-paycheck withholding
result = annual_tax / pay_periods

# Ensure the result is not negative
result = max(0, result)