I was doing some research on the taxable status of money being gifted to CO’s and travelling missionaries and was surprised with what I found. I had assumed that it was not taxable income in Australia.
It is taxable income in Australia and it‘s likely that the same rules apply in some other Countries.
A registered religious institution only receives tax free status on donations because they have been endorsed by the Australian Tax Office. Travelling Overseas and missionaries are not in this category.
There’s a Tax Ruling that goes into great detail. It’s called IT 2674 and the following is an excerpt
IT 2674 Income tax: gifts to missionaries, ministers of religion and other church workers - are the gifts income?
”36. Matthew is a visiting evangelist who receives voluntary unsolicited gifts of money and gifts in kind called 'love offerings' when he addresses a gathering of worshippers. These gifts are received because those attending are spiritually move to make the gifts. Matthew is not in any way motivated by the prospect of receiving gifts. Rather, he is motivated only by a genuine commitment to his religious beliefs. The gifts are assessable income and should be included in Matthew's tax return for the year of income in which he receives them.”
https://www.ato.gov.au/law/view/print?DocID=ITR%2FIT2674%2FNAT%2FATO%2F00001&PiT=99991231235958
Whether they are declaring it or not is another question.
Surely in the USA it would be similar to a person receiving tips and similar laws would apply?