Most online brokerage platforms offer detailed capital gain and loss ledgers for your investments.

FORBES: A Magical Tax-Loss Harvesting Machine?

Currently pending in several federal appeals courts is the validity of a recent regulation that says the IRS has six years, rather than the normal three, to audit and adjust a return when a taxpayer fails to properly report capital gain or loss due to a miscalculation of basis in property.

FORBES: The Supreme Court Expands The IRS's Ability to Write the Tax Rules

All income or loss would be separated into three buckets: tax credits, capital gain rate items, and ordinary income (all other items).

FORBES: Business Return Due Dates