Solution to XIRR with Terminal Values

Hi austinsense,

Thanks for your post. I found it somewhat helpful, although I have made my own code to deal with a similar problem. I wanted to find what my rolling IRR is for every date instead of a specific date. Also in the dataset, I have a number of different assets (Name), that I need to seperately calculate rolling IRRs for, adding an additional level of complexity. 

Fianlly, I have included a couple of checks to ensure that the formula will not error if data is queried that cannot be used in the IRR calculation. These checks include:

 - checking to ensure that the first value in the column is a negative, and

 - ensuring there is at least one positive and one negative value in the dataset.

A big thanks to v-ljerr-msft for their help!!

Cheers,

MJ

ROLLING XIRR = 
VAR countpos =
    CALCULATE(
        COUNT('INVESTMENT RETURNS'[totalcashflow]),
            FILTER(ALL('INVESTMENT RETURNS'), 'INVESTMENT RETURNS'[totalcashflow]>0 && EARLIER ('INVESTMENT RETURNS'[Index] ) >= 'INVESTMENT RETURNS'[Index] && 'INVESTMENT RETURNS'[Name] = EARLIER ( 'INVESTMENT RETURNS'[Name] )
              )
           )

VAR minIndex =
    CALCULATE (
        MIN ( 'INVESTMENT RETURNS'[Index] ),
        FILTER (
            ALL ( 'INVESTMENT RETURNS' ),
            'INVESTMENT RETURNS'[Name] = EARLIER ( 'INVESTMENT RETURNS'[Name] )
        )
    )
VAR firstValue =
    CALCULATE (
        MIN ( 'INVESTMENT RETURNS'[FREE CASHFLOW FOR PERIOD (excl. sale)] ),
        FILTER (
            ALL ( 'INVESTMENT RETURNS' ),
            'INVESTMENT RETURNS'[Name] = EARLIER ( 'INVESTMENT RETURNS'[Name] )
                && 'INVESTMENT RETURNS'[Index] = minIndex
        )
    )
RETURN
    IF (
        'INVESTMENT RETURNS'[Index] > minIndex
            && firstValue < 0
            && countpos >= 1 ,
            XIRR (
                UNION( 
                    SUMMARIZE( 
                        FILTER(ALL ( 'INVESTMENT RETURNS' ), EARLIER ('INVESTMENT RETURNS'[Index] ) >= 'INVESTMENT RETURNS'[Index] && 'INVESTMENT RETURNS'[Name] = EARLIER ( 'INVESTMENT RETURNS'[Name] ))
                        ,'INVESTMENT RETURNS'[Index],
                        "DATE1",MAX('INVESTMENT RETURNS'[DATE]),
                        "CASHFLOW",MAX('INVESTMENT RETURNS'[FREE CASHFLOW FOR PERIOD (excl. sale)])
                            ),
                    SUMMARIZE(
                        FILTER(ALL ( 'INVESTMENT RETURNS' ), EARLIER ('INVESTMENT RETURNS'[Index] ) = 'INVESTMENT RETURNS'[Index] ),
                        'INVESTMENT RETURNS'[Index],
                        "DATE1",MAX('INVESTMENT RETURNS'[DATE]),
                        "CASHFLOW",MAX('INVESTMENT RETURNS'[EQUITY REPAYMENT/(INVESTMENT) ON SALE])
                            )
                ),
                [CASHFLOW],
                [DATE1]
            )
    )