ba·sis /'bā-səs/ n pl ba·ses /-ˌsēz/
1: something (as a principle or reason) on which something else is established
the court could not imagine any conceivable basis for the statute see also rational basis
2: a basic principle or method; esp: the principle or method by which taxable income is calculated
◇ The Internal Revenue Code has set some limits on which method a taxpayer may use for figuring taxable income. For example, a corporation with gross receipts under $5,000,000 may be a cash-basis taxpayer.
ac·cru·al basis: a method of accounting in which income and expenses are recorded in the period when they are earned or incurred regardless of when the payment is received or made – called also accrual method;
cash basis: a method of accounting in which income and expenses are recorded in the period when payment is received or made – called also cash method;
3: the value (as cost or fair market value) of an asset used in calculating capital gains or losses for income tax purposes
adjusted basis: the basis of an asset increased or decreased to reflect changes in value (as through improvement or depreciation)
car·ry·over basis /'kar-ē-ˌō-vər-/: the basis of a donated or transferred asset that is equal to the basis of the asset when it was in the hands of the donor or transferor
◇ Carryover basis is generally applied to gifts, transfers in trust, and property acquired from a decedent.
cost basis: the basis of an asset equal to the amount paid for the asset plus other acquisition costs (as a brokerage fee)
stepped–up basis /'stept-'əp-/: a basis (as a carryover or cost basis) that is increased (as to fair market value) by other than an improvement or depreciation adjustment
sub·sti·tut·ed basis: the basis of property received in exchange for property of a like kind that is equal to the basis of the property given with adjustments for additional consideration received or gains and losses realized
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.