Next Month DAX in Power BI
In Power BI, you can create a new column that holds the Month DAX function to get the next month as the following
1) Get Next Month from Today in DAX
NextMonth = MONTH(TODAY())+1
2) Get Next Month from based on another Date column in DAX
NextMonth = MONTH([DateColumn])+1
Next Month Date DAX in Power BI
Regarding the Next Month's date column, you can easily use the DateAdd DAX function to add a month to the current date as below:
DATEADD(Table[Date Column],1,Month)
See Also, How to use DAX DATEDIFF in Power BI