Which form is associated with claiming the Foreign Tax Credit?

The Foreign Tax Credit is claimed using Form 1116. This form allows U.S. taxpayers to report foreign taxes paid or accrued and to claim a credit for those taxes against their U.S. tax liability. The purpose of the Foreign Tax Credit is to prevent double taxation on income earned in foreign countries. By using Form 1116, taxpayers can calculate the allowable credit based on the foreign taxes they've incurred and the ratio of their foreign income to total income.

The other forms listed serve different purposes. For instance, Form 5405 is used to claim the First-Time Homebuyer Credit, Form 3800 is for general business credits, and Form 8396 is related to the Mortgage Interest Credit. Therefore, Form 1116 is specifically tailored to facilitate the claiming of the Foreign Tax Credit, making it the correct choice for this question.