The amount of the general business credit may not exceed the taxpayer's net income tax, less the greater of: (1) the taxpayer's tentative minimum tax, or (2) 25 percent of the taxpayer's net regular tax liability over $25,000. Code Section 38(c)(1).
The entire amount of the unused credit is carried back; the amount carried forward to each of the following 20 years depends on the amount that is not used in each of those years. Code Section 39(a)(2).
Any qualified general business credits that remain unused after the end of the 20-year carryforward period (or when a taxpayer dies or goes out of business) may be taken as a deduction in the first tax year after the end of the 20-year carryforward period (or in the year of the taxpayer's death or cessation of business). Code Section 196(a) , 196(b) and 196(c)).
In general, Form 3800, General Business Credit, must be used to claim any credit that is part of the general business credit. The allowable credit is directed for individuals to transfer to Form 1040, line 55 or Form 1040NR, line 50 per Form 3800 line 19
I hope this is the information that you need to deduct the remaining general business credit carryforward.
Yes, it is still taken as a credit even though the term "deduction" is used.
I hope this helps to clarify.