Confirm the basics for you, your spouse and your dependents: Double check the name, address, Social Security Numbers and proper identification of dependents that are under age 17
Double check filing status.
Confirm your income amount. Start with the total income line. Does the amount seem reasonable? Next look at the individual areas that make up your income. Compare wages, interest, and investment income with your tax forms. This area is especially important if you own a small business.
Deductions: Mentally note whether you are taking the standard or itemized deduction approach. If standard: do the math. If itemized: review your Schedule A for accuracy.
Review the credits. Spend some time reviewing any other activity in this area of the 1040. If you see areas of entered credits, ensure you have a general understanding of what they are and why you qualify for them.