Calculate financial year start and end date based on year entered SQL Server

I have report, which takes YEAR as one parameter and I wanted to calculate the start and end of the financial year. Here is how I'm trying:

CREATE PROCEDURE [dbo].[sp_name] 
     @StartDate as datetime,
     @Enddate as datetime,
     @year as varchar(10)
AS 
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON; 

    @StartDate = year(dateadd(q, -1, cast(cast(@year AS char) + '/01/' + cast(@year AS char) AS datetime))) = @year

Is this the correct way to do this?

I need financial start date as 1-July-2014 to 30-June-2015, if year entered as 2015.Please note that, this I need internally to be calculated in script. If I'm doing something wrong, how can I correct this to get desired results?