def _compute_employee_contribution_deductions(payslip):
    # todo: _compute_employee_contribution_deductions
    return 0.0

def _compute_annual_taxable_income(payslip):
    # A = Annual taxable income = [P × (I – F – F2 – U1 )] – HD – F1
    #         # If the result is negative, T = L.
    #         annual_taxable_income = (
    #                 annual_pay_periods_p
    #                  *(
    #                     gross_remuneration_i
    #                     - employee_contribution_deductions_f
    #                     - required_deductions_f2
    #                     - union_dues_u1
    #                    )
    #                 - prescribed_zone_hd
    #                 - employee_requested_deduction_f1
    #         )
    pay_periods = payslip.dict.get_pay_periods_in_year()
    annual_pay_periods_p = pay_periods[payslip.contract_id.schedule_pay]
    gross_remuneration_i = annual_pay_periods_p * payslip.contract_id.wage
    employee_contribution_deductions_f = _compute_employee_contribution_deductions(payslip)
    required_deductions_f2 = _compute_employee_contribution_deductions(payslip)
    pass