vb.net – VBA UDF返回#VALUE！

=Taxes(I23-I18,I24-I20,"Married")

如果我输入它,效果很好.现在如果我保存工作表并重新启动excel,单元格现在显示#VALUE！如果我选择公式并再次按回车键,则重新计算它.我究竟做错了什么？不应该使用Application.Volatile但我正在尝试创意……

Private Type TaxBracket
    Perc As Double
    Floor As Currency
    Limit As Currency
End Type

Public Function Taxes(gross1 As Currency,gross2 As Currency,filingStatus As String) As Currency
    Application.Volatile True
    Dim brackets(6) As TaxBracket
    Dim stdDeduction As Currency
    Dim ssTaxRate As Double
    Dim medicareTaxRate As Double
    Dim Tax As Double

    stdDeduction = 5700
    ssTaxRoof = 106800
    ssTaxRate = 0.062
    medicareTaxRate = 0.0145

    Tax = medicareTaxRate * (gross1 + gross2)
    Tax = Tax + IIf(gross1 < ssTaxRoof,ssTaxRate * gross1,ssTaxRate * ssTaxRoof)
    Tax = Tax + IIf(gross2 < ssTaxRoof,ssTaxRate * gross2,ssTaxRate * ssTaxRoof)

    brackets(0).Perc = 0.1
    brackets(1).Perc = 0.15
    brackets(2).Perc = 0.25
    brackets(3).Perc = 0.28
    brackets(4).Perc = 0.33
    brackets(5).Perc = 0.35

    If filingStatus = "Single" Then
        brackets(0).Floor = 0
        brackets(1).Floor = 8375
        brackets(2).Floor = 34000
        brackets(3).Floor = 82400
        brackets(4).Floor = 171850
        brackets(5).Floor = 373650
        brackets(0).Limit = 8375
        brackets(1).Limit = 34000
        brackets(2).Limit = 82400
        brackets(3).Limit = 171850
        brackets(4).Limit = 373650
        brackets(5).Limit = 1000000000

        Tax = Tax + incomeTaxes(gross1,brackets,stdDeduction) + incomeTaxes(gross2,stdDeduction)
    ElseIf filingStatus = "Married" Then
        brackets(0).Floor = 0
        brackets(1).Floor = 16750
        brackets(2).Floor = 68000
        brackets(3).Floor = 137300
        brackets(4).Floor = 209250
        brackets(5).Floor = 373650
        brackets(0).Limit = 16750
        brackets(1).Limit = 68000
        brackets(2).Limit = 137300
        brackets(3).Limit = 209250
        brackets(4).Limit = 373650
        brackets(5).Limit = 1000000000

        Tax = Tax + incomeTaxes(gross1 + gross2,stdDeduction * 2)
    Else
        Taxes = "N/A"
        Return
    End If
    Taxes = Tax
End Function

Private Function incomeTaxes(gross As Currency,brackets() As TaxBracket,deduction As Currency) As Currency
    Dim Tax As Double
    Dim taxable As Double

    Tax = 0
    taxable = gross - deduction


    For i = 0 To 5
      If taxable > brackets(i).Limit Then
        Tax = Tax + (WorksheetFunction.Min(taxable,brackets(i).Limit) - brackets(i).Floor) * brackets(i).Perc
      Else
        If taxable > brackets(i).Floor Then
            Tax = Tax + (taxable - brackets(i).Floor) * brackets(i).Perc
        Else
            'tax = tax
        End If
      End If
    Next i

    incomeTaxes = Tax
End Function