DAX formula help

[jo123456]

My formula works right now but I want to know if it will always give a valid output or potentially a simplier version?

YearIndicator = if(

            (('D-DATE'[CalendarYear]*100)+'D-DATE'[CalendarMonthNum])

            <((YEAR(TODAY())-1)*100)+9,"Before Previous Year",

if(

            (('D-DATE'[CalendarYear]*100)+'D-DATE'[CalendarMonthNum])

             >=((YEAR(TODAY())-1)*100)+9

            && ((('D-DATE'[CalendarYear]*100)+'D-DATE'[CalendarMonthNum])

            <=(YEAR(TODAY())*100)+8),"Previous Year",

IF (

            (('D-DATE'[CalendarYear] * 100) + 'D-DATE'[CalendarMonthNum])

            >= ((YEAR(TODAY()) * 100) + 9)

            && (('D-DATE'[CalendarYear] * 100) + 'D-DATE'[CalendarMonthNum])

               <= ((YEAR(TODAY()) + 1) * 100) + 8,"Current Year",

IF (

            (('D-DATE'[CalendarYear] * 100) + 'D-DATE'[CalendarMonthNum])

            >= ((YEAR(TODAY()) + 1) * 100) + 9

            && (('D-DATE'[CalendarYear] * 100) + 'D-DATE'[CalendarMonthNum])

               <= ((YEAR(TODAY()) + 2) * 100) + 8,

            "Next Year",

"Future Dates"))))

[Greg_Deckler]

@jo123456 Here is a cleaned up version using SWITCH TRUE. Is the goal here to essentially implement a fiscal year flag where the fiscal year starts in September? 

YearIndicator1 = 
    SWITCH( TRUE(), 
        'D-DATE'[CalendarYear] * 100 + 'D-DATE'[CalendarMonthNum] < (YEAR(TODAY())-1) * 100 + 9, "Before Previous Year",
        'D-DATE'[CalendarYear] * 100 + 'D-DATE'[CalendarMonthNum] >=(YEAR(TODAY())-1) *100 + 9 && 'D-DATE'[CalendarYear] * 100 + 'D-DATE'[CalendarMonthNum] <= YEAR(TODAY()) * 100 + 8, "Previous Year",
        'D-DATE'[CalendarYear] * 100 + 'D-DATE'[CalendarMonthNum] >= YEAR(TODAY()) * 100 + 9 && 'D-DATE'[CalendarYear] * 100 + 'D-DATE'[CalendarMonthNum] <= (YEAR(TODAY()) + 1) * 100 + 8, "Current Year",
        'D-DATE'[CalendarYear] * 100 + 'D-DATE'[CalendarMonthNum] >= (YEAR(TODAY()) + 1) * 100 + 9 && 'D-DATE'[CalendarYear] * 100 + 'D-DATE'[CalendarMonthNum] <= (YEAR(TODAY()) + 2) * 100 + 8, "Next Year",
        "Future Dates"
    )

[jo123456]

starts in september of the current year and always ends in august of the next year

[Greg_Deckler]

@jo123456 Does seem possible that there should be an easier way to do this. One thing that would help greatly would be to use SWITCH( TRUE(), ... ) instead of the nested IF statements.