gistfile1.rb

module StaticInstructions::Meta
  class BasicFederalTax < Base
    include PayPeriods
    
    zero_or_positive!
  
    def value
      tr.rate * deps.annual_taxable_income - tr.constant - k1 - k2 - k3 - k4
    end

    def tr
      TaxRates.new(deps.annual_taxable_income)
    end
 
    def k4
      [bd(0.15) * deps.annual_taxable_income, bd(0.15) * bd(1_117)].min
    end
 
    def k3
      0
    end
 
    def k2
      bd(0.15) * [pay_periods * deps.canada_pension_plan, bd(2_356.20)].min
      + bd(0.15) * [pay_periods * deps.employment_insurance, bd(891.12)].min
    end
 
    def k1
      employee.td1_form.total_claim * 0.15
    end
 
    def calculation_dependencies
      [ :annual_taxable_income, :canada_pension_plan, :employment_insurance ]
    end
  end
end