What percent of income do Buddhists give to temples? From the upaseka precepts:


  "He levies one sixth of people’s wealth as taxes."


I used to just think this was prosocial advice, but for much of Buddhism's history, it has been state supported. Paying taxes mean supporting state Buddhism. But Buddhism isn't state supported anymore and even when it was, those taxes paid for military and government bureaucracy in addition to Buddhist temples.

In Christianity, some sects have a policy of expecting 1/10 of income.

So, other than a rhetorical dodge (It depends!), do we have any modern examples of recommended dana as a percent of income, or failing that, numbers on what constitutes a fair contribution towards the support of organized religion in modern, western (US or European) countries?
From DN Book 3 8:265, Buddha said 25% is to be consumed, 50% is to be in investment/trading, 25% is to be in keep for retirement or emergency safe. This does not include donation reserve to answer your question but by doing justified modification of above dividing, 20% should go to donation if we have to calculate proportionally.