Is there a simple way to make this MTD instead of calculating the last month?

    Select Count(PARENTACCOUNT) as Total_cars, SUM(Cast(ORIGINALBALANCE as decimal(10,2))) as     Total_Amount
    INTO #TEMP2
    From car
    Where type = '71' 
    and OPENDATE >= DATEADD(month, -1, convert(date, GETDATE()))

Need MTD instead of DATEADD(month, -1, convert(date, GETDATE()))