Life insurance and annuity sales people. Those two products are INCOME tax deferred and much easier to sell (for big commissions) while there is an income tax.
Third party administrators. The folks who maintain the record keeping and file the tax forms for various retirement plans such as 401(k)s. The need for these tax deferred plans disappears without an income tax.
Tax shelter companies. Real estate and oil/gas exploration mainly. This industry employs a lot of people and sells products which, in some cases, have no economic value other than to defray income tax liability.
Now a lot of the "status quo lovers" on this board will deny that they have any agenda. If none of these posters will admit to being dependent on the income tax for a living, then where ARE the posters who are so dependent? Anyone? Anyone?
Oh, btw. There has been much gnashing of teeth whenever I bring up the fact that there are so many professions reliant on the IRS. Let’s see who “doth protest too much”.