11.   Buchanan said he would favor retaining an exemption for mortgages while taxing unearned income.

12.   But in other respects, the two tax plans differ significantly, in part because Gramm would tax unearned income, like capital gains.

13.   Compliance costs are reduced by eliminating the hodgepodge of complicated rules and taxing income at a single rate.

14.   Dividend income would be taxed in a similar fashion.

15.   Illinois-based issuers are usually forced to offer higher yields than those in other states because Illinois taxes the income earned on most in-state issues.

16.   In its purest form, a flat tax would eliminate most deductions and tax all income at a single low rate.

17.   It has mounted a public relations campaign questioning the fairness of the flat tax, which would eliminate many deductions while taxing income at one or two rates.

18.   It earns its money on investments, and Bermuda does not tax investment income, so Cigna has moved its corporate parent to Bermuda.

19.   Last January, a federal law took effect prohibiting states from taxing pension income of nonresidents.