10 Things the IRS Won't Tell You

When Cindy Hockenberry and her husband sent in a tax-penalty payment in 2007, they knew there was a chance their math might not jibe with the IRS’s. When that turned out to be true and the amount was much higher than expected, they decided to dispute it. Fortunately for them, Hockenberry’s a pro. As tax research coordinator at the National Association of Tax Professionals, she spotted a glitch in the IRS’s calculation; after visiting the local IRS office, the agency admitted its mistake and lowered the penalty. “There’s no way the average taxpayer would have noticed,” she says.

As recently as 2000, less than half of all taxpayers were using a preparer. Today 80 percent use software or a tax pro, “because they’re scared of making a mistake,” says Nina Olson, the National Taxpayer Advocate. “That’s a sign the system’s too complex.” A pro may not be necessary for basic returns that include just a W-2 and, say, mortgage interest; in those cases, TurboTax will do. However, if you’ve made a lot of market moves or run a side business, consider a preparer. (You can find one at www.natptax.com; expect to pay $150 to $200 per return.)

All illustrations by Ryan Heshka.