How Can I Sum Vat in a column in sql server 2008?

Question

suppose i have the following table

CREATE TABLE #ResultTable (NettAmount money, GrossAmount money,TotalVat money) 

Given a gross amount eg=250 I know that vat is at 17.5% How Do i calculate the totalVat?

Thanks for any suggestions

Answer 1

 INSERT #ResultTable 
     (NettAmount, GrossAmount, TotalVat)
 SELECT
     NettAmount, GrossAmount, GrossAmount * 17.5 /100
 FROM
     SourceTable 

It's unclear what you want to do, sorry...

Answer 2

devnet247 - have a 2nd table that contains the valid date tracked VAT rate along the lines of:

vat_rate | vat_type | stt_date | end_date
-----------------------------------------
0.175    | 1        | 20100101 | null


vat_type | description
-----------------------------------------
1        | standard rate
2        | reduced rate
3        | zero rate

and then join on that table where the invoice date is valid for the row. your final sql would be along the lines of

SELECT SUM(NettAmount * vat_rate as total_vat) from #ResultTable r1, vat_table v1 
where r1.invoice_date between v1.stt_date and v1.end_date
and r1.vat_type = v1.vat_type

anyway, if you were tracking the vat that is :)

jim

[edit] - if you were to use a second table, i'd suggest extending that to a 3rd - vat_type table, as vat rates vary across products as well as time. see http://www.hmrc.gov.uk/vat/forms-rates/rates/rates.htm#1

Answer 3

SELECT SUM(GrossAmount) * 17.5 /117.5 AS VATAmount
FROM SourceTable

Bearing in mind that (UK) VAT is due to increase to 20% from January 2011, it would be a good idea to follow Jim's suggestion of a date-tracked VAT rate lookup table.