Percentage/Tax

CREATE PROCEDURE [dbo].[April_2021_MinusTax]

AS
    SELECT (SELECT Sum(Isnull(job_value, 0)) - ( 12500 )
            FROM   dbo.tbl_jobs
            WHERE  installation_date BETWEEN '2020-05-20' AND '2021-04-04') -
                  (SELECT Sum(Isnull(Van, 0))
                          + Sum(Isnull(Tools, 0))
                          + Sum(Isnull(Fuel, 0))
                          + Sum(Isnull(Insurance, 0))
                          + Sum(Isnull(Screwfix, 0))
                          + Sum(Isnull(Building, 0))
                          + Sum(Isnull(Office, 0))
                          + Sum(Isnull(Clothing, 0))
                          + sum(isnull(Phone, 0))
                   FROM   Expenses
                   WHERE  Invoice_Date BETWEEN '20200405' AND '20210404') -
                  (SELECT Sum(Isnull(admin_fee, 0))
                   FROM
                  tbl_jobs
                  WHERE
                  installation_date BETWEEN '20200405' AND '20210404')