It depends. There's rules about the minimum payment you need to make to avoid penalties and interest. If what you pay each year equals at least 100% of your previous year's tax due or 90% of the current year's, they usually won't go after you unless they're pretty sure they can dig up enough to put you into the penalties range again. If you're filing Schedule C or other more unusual forms, or you've got a lot of non-standard credits and deductions that you don't have solid paperwork on, they may give it a go. But if you've got a relatively straightforward return with little chance they'll be able to get penalties out of you even if the audit succeeds, they normally won't waste their time. And even if you've got an exotic return, if you've been audited several times before and they've come up with nothing there's a good chance your file's been internally flagged "not worth the hassle". They're judged on recoveries, and they want to avoid spending time and effort on audits that won't yield any recovery unless there's absolutely nothing juicier in their In box.

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