Magento TAX / VAT calculation bug in grouped products
Grouped products is feature by Magento that allows to group products in main and sub products. This feature is similar to sub products feature in CRE Loaded PRO and B2B versions.
An issue was found with grouped products when we configure to show products price including and excluding tax. On listing pages for grouped products both prices are same and tax is not being calculated properly. See image below

On product page prices for sub products are calculated including VAT, which is correct behavior, see image below.

This shows that TAX / VAT is configured properly. This is have been reported on Magento bug tracking and its current status is “Assigned”.
I think this issue can be resolved if TAX Class option in enabled for grouped products, currently this is only available for simple products, or catering the TAX Class properly when calculating starting from price. Hope this issue will be resolved soon.
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[...] Magento TAX / VAT calculation bug in grouped products [...]
The Magento team have confirmed that the bug has been fixed. You can see details http://www.magentocommerce.com/bug-tracking/issue/?issue=8617