Comment 3 for bug 1084822

Yes, I understand that you can set a default analytic account to collect all taxes, this however, is an unreasonable limitation. We are an NGO that cannot reclaim VAT. Our analytic accounts reflect various donor funded projects. Most donors allow for paying VAT from grants, some don't. In the first case the tax should be accounted in the same analytic account as the main invoice line. It is only in the second case, that a catchall Invoice Tax Analytic Account is a good solution.

Btw a UI design principle: if something should not be done, the user should not be able to do it. Making the tax lines look editable invites people to actually edit them. The fields should be disabled then, if they should not be edited.