Tax Calculation Path

[gkarthick87]

Hi,

I want to know which function is using for tax calculation from backend order creation. I have tried in many ways but I can't find the function.
https://www.dropbox.com/s/d6gq1xv0zbqw5m3/Magento%20Admin.png?dl=0

[Tom Robertshaw]

This is going to be using magento's tax rates system. So if you want to change the rates that are being charged, best to check the admin area configuration: http://docs.magento.com/m1/ce/user_guide/tax/tax-zones-rates.html

Should you need to look into the actual code for tax (best avoided if possible!), this is a good file to start with https://github.com/OpenMage/magento-mirror/blob/magento-1.9/app/code/core/Mage/Tax/Model/Calculation...

[gkarthick87]

Hi Tom,

Thanks for your reply. I have tested with calculation file but I didn't get any result.
My question is where the are calculating for tax total amount only for backend & I know the functionality for frontend. I just want to add custom amount with total tax amount depend of payment method selection.

Thanks

[Tom Robertshaw]

I just want to add custom amount with total tax amount depend of payment method selection.

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Can you expand on to provide detailed information about what you are trying to achieve and why please? This will help us to get a better idea for what you're trying to do and what the best way of approaching it will be. 

I wouldn't describe adding dynamic amounts to tax totals a simple task. Could the same thing be achieved by adding a surcharge rather than a tax?

[gkarthick87]

Hi,

I want to know how the tax calculation is working or I want to add cash on delivery tax amount with tax. Please refer the this screenshot to know about COD details.

https://www.dropbox.com/s/d6gq1xv0zbqw5m3/Magento%20Admin.png?dl=0

Please let me know.

Thanks

[gkarthick87]

https://www.dropbox.com/s/d6gq1xv0zbqw5m3/Magento%20Admin.png?dl=0