Handling dates is always a fun challenge in T-SQL! Finding the current end of month and next months beginning of month is straight forward, but I like to find new ways to do things that take less coding, and hate date conversions that require a lot of manipulation of characters and concatenation.

This was what I came up with for avoiding character conversions and concatenation for finding the current BOM (beginning of month) and EOM (end of month) values. Adjust according to your needs. Cheers!

--use datediff from 0, ie default 1900 date, to calculate current months as int
declare @ThisMonth int = datediff(month,0,cast(getdate() as date))
--add 1 to the current month to get the next month
declare @NextBom date = dateadd(month,@ThisMonth+1,0)
-- subtract a day from the beginning of next month to get the current end of month, without worrying about 28, 30, or 31 days.
declare @ThisEom date = dateadd(day,-1,@NextBom)
select @ThisMonth 
select @NextBom
select @ThisEom