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is the term fiscal year in caps in use in letter writing?
ex.: fiscal year 2005
is that correct?
Comments 
The fiscal in fiscal year is not capitalized unless it starts the sentence.
Yes, exactly.
Is fiscal year capitalized in this sentence?

It's that time of year again, the end of the fiscal year.

or should it be?

It's that time of year again, the end of the Fiscal Year.
I wouldn't capitalize unless listing the year along with it, or the name of the organization along with it. I imagine there are those who wouldn't capitalize it even then. The XXX Association Fiscal Year 2015-2016.