Magento2: Tax rates calculation is going wrong

[arun-techmanyata]

Hi M using magento 2, I am trying to setup tax rates but the tax calculation resultant is wrong not sure where am i going wrong. Kinldy help me on this.
Expected:
Product cost(Backend): INR 100
Product cost(Frontend): INR 100 (This is inclusive of tax 18%)
Cart: Subtotal: INR 82
tax: INR 18
Total: INR 100

But what i see is the following:

Configuration is as follows:

[korostii]

When price includes tax, tax base isn't 100 in this case, it's 84.75 actually.
Thus tax = (84.75 * 18)/100 = 15.255

The formula to use in order to calculate tax directly from price incl.tax is:
tax = (price * 18) / (100 + 18) = 15.25423728813559

[arun-techmanyata]

Thanks Korostii. Is there any way that i can achieve the expected results.

[arun-techmanyata]

Expected:
If Assigned Product cost at Backend as INR 100

Product cost(Frontend): INR 100 (This is inclusive of tax 18%)
Cart: Subtotal: INR 82
tax: INR 18
Total: INR 100

[vherasymenko]

@arun-techmanyata Thank you for your report.
Please use the issue reporting guidelines to report an issue. Include the steps required to reproduce, the actual result, and the expected result.

[korostii]

@arun-techmanyata,
If your tax base is less than 100, tax has to go lower than 18. Otherwise it's just wrong and not "desired".

While having tax rate of 18% , you can have row tax of INR 18 only if price _excluding_ tax is INR 100.
You can do that by switching "Display Taxes" setting to "Excluding Tax"
E.g. price in admin 100 , tax rate 18% -> tax will be applied on top of price -> in frontend you'll have:
price excl. 100, tax 18, total 118.

[korostii]

Additionally, please keep in mind that this is not a help desk.
The behavior of Magento in this case seems to be as intended thus it's not a bug.
The GitHub issue tracker is intended for tracking technical issues (read: "bugs") of Magento CE itself only.

If you are looking for some help or an advice regarding setup or configuration please refer to the Community Forums or the Magento Stack Exchange.

[fooman]

Closing this issue since Magento seems to work as expected. Thanks @korostii for looking into this.