Your query is quite complex (or at least long). I have no idea why do you have all those UNION ALL if you're always querying the same tables (maybe you need it maybe not) and I have nothing to test with.

If you provide DDL, sample data and expected results based on the sample data you might get better help. For information on how to do it, read the article on my signature.

That said, I believe that you can change your CTEs into one like this:

SELECT S.POSAccount,

I.Brand,

SUM(CASE WHEN S.InvoiceDate >= DATEADD(yy, DATEDIFF(yy, 0, getdate()), 0)

AND S.InvoiceDate <= GETDATE()

THEN S.NetAmount END) AS [Amount_YTD_A],

SUM(CASE WHEN S.InvoiceDate >= DATEADD(yy, DATEDIFF(yy, 0, getdate()) - 1, 0)

AND S.InvoiceDate <= DATEADD(yy, - 1, GETDATE())

THEN S.NetAmount END) AS [Amount_YTD_A_1],

SUM(CASE WHEN S.InvoiceDate >= DATEADD(yy, DATEDIFF(yy, 0, getdate()) - 1, 0)

AND S.InvoiceDate < DATEADD(yy, DATEDIFF(yy, 0, getdate()), 0)

THEN S.NetAmount END) AS [A_1],

SUM(CASE WHEN S.InvoiceDate >= DATEADD(yy, DATEDIFF(yy, 0, getdate()) - 2, 0)

AND S.InvoiceDate < DATEADD(yy, DATEDIFF(yy, 0, getdate()) - 1, 0)

THEN S.NetAmount END) AS [A_2]

FROM SalesInvoiceLines S

INNER JOIN ItemLocal I ON S.CompanyAccount = I.CompanyAccount

AND S.LocalItemNumber = I.ItemNumber

AND I.ItemGroup IN ('FG','KITS')

WHERE S.CompanyAccount = '025'

AND S.InvoiceDate >= DATEADD(yy, DATEDIFF(yy, 0, getdate()) - 2, 0)

AND S.InvoiceDate <= getdate()

GROUP BY S.POSAccount,

I.Brand

Also, avoid using functions on columns used in WHERE clauses. e.g. YEAR(SalesInvoiceLines.InvoiceDate)