Include all of the necessary forms with your return . That includes W-2s and all the extra tax forms and schedules required by your return. Forms are available at many banks, libraries, Post Offices, and, of course, IRS offices. If you know something looks suspicious, explain it up front. A short explanation or informal schedule attached to the return and keyed to the line on the form can avoid audits.
Typical examples are unusually high deductions for medical or business expenses.
Substantiate before you file . Knowing that you can document your deductions will let you sleep easier. If this is your first time around claiming business expenses, for example, and you haven't been conscientious about saving paperwork, you might contact suppliers for duplicate statements to verify payment of expenses. Double-check your math. Make sure you've signed your return.