There are two main tax exemptions which churches benefit from in the US. The first is that donation are tax deductible for taxpayers that itemize their deductions. The second is that any income from investments is also tax free. This is the case for any 503b non-profit organization in the US, not strictly for churches. For example, if you local youth soccer program was a 503b the interest from their bank account isn’t taxed.

If a 503B puts its money into Microsoft stock, the profits that Microsoft makes are taxed. The capital gains the 503B gets wouldn’t get taxed when the stock was sold.

The main argument in the article, not fully stated, is that the Mormon Church doesn’t do enough beneficial works to qualify as a 503b. In the US, Churches are granted 503b status without specific reviews of their societal benefit. If you want to pay someone to operate a homeless shelter or ding a bell all day to prevent the end of times, it is all the same. This is part of separation of church and state as laid out in the constitution. If there was a specific review the State could “put its thumb” on the scales and favor some churches over others in granting non-profit status.

Churches, just like the local soccer club don’t have the same distribution requirements that a donor controlled 503b would have. For example if you are a billionaire and donate $1B of your appreciated stock to your donor directed fund you need to distribute 5% per year on charitable works to keep the 503b status. The article implies that the same requirement should apply to the Mormon Church that applies to a donor directed fund. This line of reasoning is incorrect.

A donor directed fund has substantially no other affiliated activity that has to be considered. This is more like Harvard’s endowment where there is a school controls the fund. In the case of Harvard, if the fund didn’t distribute anything in a year there still would be substantial educational work and research going on. In the case of a donor directed non-profit nothing would be happening. The Mormon Church argues that it operates more like Harvard and that the whistleblower did not have access to the larger organizations finances.

All global churches right now are facing a demographic cliff as wealthy nations are increasingly secular while most religions growth is in developing countries. In most cases Churches transfer a large amount of donations from wealthy countries like the US to less wealthy ones like Nigeria. In another 50 years many of those transfers will cease to be significant unless there is a religious revival in wealthier markets or a significant deviation in the number of children religious families have relative to the overall population in these countries. It is likely that many churches will need to wind down financial activities to be more aligned with the demographics.