You can't just watch the monitor when you are adding income because it reflects much more than the tax bracket on the income you are entering. Adding income changes your Adjusted Gross Income, not to mention the amount of taxable social security. Deductions or credits may change because they are sensitive to AGI, and the amount of SS that is taxable may have changed. The only way to tell what is happening in your return is to look at your 1040 before and after entering the income. You can do that easily by clicking on Forms in the upper right, then clicking on your 1040 which will show as part of the forms in your return on the left.
