Appendix A: The Time Value of Money

AuthorVern Krishna
ProfessionProfessor of Common Law, University of Ottawa Barrister at Law
Pages612-620
612
APPENDIX A
The TIme vaLue
ofmoney
The fundamental purpose of income tax law is to collect taxes for gov-
ernment expenditures. A taxpayer’s obligation for tax arises when he
or she earns taxable income. The obligation to pay the tax, however, is
determined by a schedule set out in the Act. Thus, the timing of tax
payments is key to the eff‌icient collection of revenue.
Time has value. The value is the effect of time on invested money.
We can look at value from two dimensions: future and present.
Given a sum of money, we can determine its value at some future date
if we know the interest rate at which we will invest the money. Con-
versely, if we know that we are to receive a sum of money in the future,
we can determine its value today if we know the rate at which it is, or
can be, invested. Thus, money has “time value.”
All assets, tangible and intangible, can be expressed in terms of
their future or present value if we can determine the rate at which the
asset is invested or discounted. The appropriate rate is usually the mar-
ket-determined interest or investment rate.
In economic terms, “interest” is the rent al cost of borrowing money.
The cost of renting money may be f‌ixed in advance, determinable at a
future time, or variable according to specif‌ied conditions. Thus, inter-
est and time are inextricably related. An interest rate is relevant if, and
only if, it is specif‌ied in relation to time.
The concept of the time value of money is relevant to all economic
transactions. Lawyers deal with assets that have a “time value” in virtu-
ally all areas of commercial practice. For example, suppose that a plain-

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