What is a "carryback adjustment" refering to foreign taxes?

[lvh1]

I understand carry forward as allowing use of unused credits from a prio year, but what is the point or anything else of  : a "carryback adjustment" ?

[JohnB5677]

Similar to a carry-forward adjustment, a carry-back can give you a tax reduction in a previous year.  

"Carryback and Carryover of Unused Credit: If you can't claim a credit for the full amount of qualified foreign income taxes you paid or accrued in the year, you're allowed a carryback and/or carryover of the unused foreign income tax.  You can carry back for one year and then carry forward for 10 years for any unused foreign tax credit. "

For more information on this topic, see:  Topic No. 856 Foreign Tax Credit   and Publication 514, Foreign Tax Credit for Individuals.

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