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IRS.gov Website
Publication 17
taxmap/pub17/p17-122.htm#en_us_publink1000173317

Items You 
Cannot Deduct(p156)

rule
Some interest payments are not deductible. Certain expenses similar to interest also are not deductible. Nondeductible expenses include the following items.
taxmap/pub17/p17-122.htm#en_us_publink1000173319

Penalties.(p156)

rule
You cannot deduct fines and penalties paid to a government for violations of law, regardless of their nature.
taxmap/pub17/p17-122.htm#en_us_publink1000173320

Personal Interest(p156)

rule
Personal interest is not deductible. Personal interest is any interest that is not home mortgage interest, investment interest, business interest, or other deductible interest. It includes the following items.
Deposit
You may be able to deduct interest you pay on a qualified student loan. For details, see Publication 970, Tax Benefits for Education.