Tax Calculation


Issue on Tax calculation

let us suppose i have posted a sales return order - 001 on 15-01-10 with tax 10%… on 08-02-10 i have created a new sales return order for 30-01-10 with copy document with that last sales return order - 001… but the the Tax % has changed to 8% from 01-02-10 i require the system to post with tax 10% as it is for last month…but the system wil take posting date and calculate the tax…Any help or Advice…

thanks in Advance


What is the posting date in your document. If the posting date is =>01-02-10 then system will take the 8%.

If the transaction pertains to 31-01-10 then why don’t you post it on that date itself.


The system should take 10%.

tell me whether you have modified the existing tax percentage(from 10% to 8%)

or you have created new line with different date intervals(for 8% without updating 10%)…

hope this will help you




  1. In the GL>Parameters>Sales tax Tab>Set the calculation date type as Document date.

  2. While posting the Sales order Posting>Invoice>Setup Tab>Set the document date as of January and post.

  3. Check the tax calculated will be at 10%

Can you further elaborate where is this Sales Tax Tab. It would be wonderfule to have and can save a lot many clients from the problem of returns in case of change in tax rates.

I hope you are not talking about AX because I replied looking at NAV.

Hi Suresh,

Did you ever find a solution to this problem? If yes, would you mind sharing it with us?