The confidential document, received by the IRS on Nov. 21, accuses church leaders of misleading members — and possibly breaching federal tax rules — by stockpiling their surplus donations instead of using them for charitable works. It also accuses church leaders of using the tax-exempt donations to prop up a pair of businesses…

The complaint was filed by David A. Nielsen, a 41-year-old Mormon who worked until September as a senior portfolio manager at the church’s investment division, a company named Ensign Peak Advisors that is based near the church’s headquarters.

Nonprofit organizations, including religious groups, are exempted in the United States from paying taxes on their income. Ensign is registered with authorities as a supporting organization and integrated auxiliary of the Mormon Church. This permits it to operate as a nonprofit and to make money largely free from U.S. taxes.

The exemption requires that Ensign operate exclusively for religious, educational or other charitable purposes, a condition that Nielsen says the firm has not met.