Simply put, our Maximum Refund (or Tax Savings) Guarantee says that if you get a bigger tax refund (or owe less taxes) through another tax preparation method, we'll refund the purchase price you paid for TurboTax.
As with any guarantee, there are stipulations. For example, you have to notify us within 60 days of filing your return in TurboTax, and your return must be identical to the return prepared using the other tax-prep method.
You can read the fine print at the Intuit Software End User License Agreement for TurboTax Desktop Software or the End User License Agreement for TurboTax Online. Enter maximum refund in the Find feature in your browser (usually listed under Edit) to go to it quickly.