TOTALYTD DAX Function in Power BI
The TOTALYTD DAX function is used to calculate a cumulative total year-to-date value for a given expression in the current filter context. It considers the dates from the start of the year up to the specified date.
DAX Syntax TOTALYTD(expression, dates[,filter][,year_end_date])
Example: Click on New measure. The following expression creates a measure.
DAX
The TotalYTD function =
TOTALYTD(
SUM(Sheet8[Annual Income]),
'Sheet8'[Date] -- Must be a Date column
) 
Here the end date is not specified, so by default it is 31st December.
