As anyone involved in church budgets knows, there are some unique and confusing rules about the way that clergy are taxed, described in IRS Publication 517.
One rule is that even though clergy are common law employees, for FICA purposes they are treated as self-employed and pay both halves of the FICA. The reason for this is that some denominations have theological objections to social security for their clergy, so the clergy can file Form 4361 or 4029 to opt out. Most don't opt out, so this causes an increase in the tax they pay.
The other rule is that housing is deductible. The church can identify part of the clergy's pay as the housing allowance, which isn't taxable. The reason for this is that some churches provide parsonages or other housing for clergy, which isn't taxable, so this makes the taxation comparable for clergy in churches that don't. The nominal rule is that the housing allowance isn't supposed to exceed the fair rental value of the clergy's house, but for many years Rick Warren took 100% of his salary as housing, the IRS had a long running court case against him, and a few years ago the Congress passed a law to make the court case go away, with the clear message that any housing allowance is OK. Clergy can still take all the usual deductions, such as mortgage interest and property taxes, just like anyone else.
In most cases, the cost of the FICA rule and the benefit of the housing rule are about equal, so the reasonable way to do your church budgeting is to ignore the tax rules in the budget, and set the pay as you do for any other employee.
My denomination has long advised its congregations to pay ministers a FICA "top up" of 7.5% above the nominal salary, to compensate for the cost of the FICA rule. This has always struck me as totally bogus, since they wouldn't dream of advising us to reduce pay by the value of the housing benefit. The explanations have ranged from the utterly cynical ("the congregation won't understand it, and it gets the minister's pay up") to the confused ("it replaces the mortgage deduction"), to various metaphysical claims that the FICA money is of some different type than the housing money, or that the FICA topup is to compensate for the unfairness of being called a contractor when they're not, since they don't get any of the other benefits of being a contractor, whatever they are. (I'm summarizing these as best I can, given that I think they're all nonsense.)
I just had this argument again with someone who insists that it's totally unfair not to pay ministers an extra 7.5% above the nominal salary. Am I missing anything?
R's, John