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Thank you for your message, @ElykaJen_A, I will use the feedback feature as suggested and link to this thread because it seems to support more formatting options that can be quite helpful, I think. That's also why I'm adding a bit more context below on what exactly doesn't work in the EU version but does work in the Ireland and UK versions:
As I already mentioned above, I assume that a tax group is used in the Ireland and UK versions of QBO to account for reverse charge VAT. I tried to recreate this by setting up two individual VAT rates, one of 19% and another of -19%. I would then create a new group tax rate consisting of these two individual rates and use it as the tax rate of an invoice, for example. That works great, as you can see below:

However, internally, QBO seems to be working with positive tax amounts only, see for example here:

Similarly, the VAT reports are also only using positive amounts. In the example below, I tried to adjust the report by having it subtract the negative amount under "adjustments". However, QBO just adds everything up, ending in 38% tax instead of 0%, see below:

@ElykaJen_A and @RhoiceW, I submitted my feedback and received an email confirmation from UserVoice. I hope the product team will look at this and fix the issue soon. Thank you again for your quick responses to my posts.
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