Need help with- Max Date vs Current Month

Hi Braintrust,

Need your help with the below DAX.

It is currently returning 1 or 0 if the date is  Max date.
However, I would like it to return 1 if the date is the current month and 0 for all the months from the selected months.

Last Sale Period =

VAR LastSale = CALCULATE(MAX(dim_date[full_date]), ALLSELECTED(fact_jedox_invoices))

RETURN

IF(

    DATE(YEAR(LastSale), MONTH(LastSale),1) =

    DATE(YEAR(MAX(dim_date[full_date])), MONTH(MAX(dim_date[full_date])),1),

    1, 0)