The tax table is only one of seven different methods that can be used to calculate your tax, depending on what is in your tax return. Your tax return might require one of the other methods. And something you changed in the amended return could mean that the amended return has to use a different calculation method than the original return. On your Form 1040-X, line 6 should have an abbreviation on the left side that shows what method was used to calculate the tax on the amended return. What does it say?
Also, as Critter-3 suggested, there might be other taxes besides regular income tax. On Form 1040-X, what are the exact amounts in columns A, B, and C on line 6 and on line 11?
