Can I deduct that? How much should I be counting for mileage? What’s my tax rate? These are the kinds of questions that are bound to generate frantic searches on April 14, but for those ahead of the curve, consider downloading Bloomberg’s free Quick Tax Reference app. There’s probably more information here than you’ll ever need, and the app itself isn’t flashy or fun. But if you want a quick reference that puts a ton of tax information at your fingertips, it’s well worth a download — and cheaper than an audit. Free for iOS and Android devices.