The minimum tax credit carryforward refers to the amount of unused minimum tax credits that can be carried forward to future years. The credit can be carried forward for up to 10 years. The credit can be used to offset U.S. tax liability in those years, reducing the taxpayer's overall tax burden. It is important to note that the minimum tax credit carryforward is subject to certain limitations and restrictions, and the taxpayer should consult the instructions for Form 8801 for more information.