What is Time Value of Money?
The time value of money (TVM) is the concept that a dollar today is worth more than a dollar in the future because of its potential earning capacity. This foundational financial principle drives investment decisions, project evaluations, and business valuations. Every business decision with costs or benefits spread over time should account for TVM.
The Formula
Formula
Future Value = Present Value × (1 + rate)^periods Present Value = Future Value ÷ (1 + rate)^periods Discount Rate = Required Rate of Return or Cost of Capital
For business decisions, use your weighted average cost of capital (WACC) as the discount rate. For personal finance, use expected investment return.
Worked Example
Worked example
A startup can invest $100,000 today in a marketing campaign expected to generate $150,000 in revenue over 3 years. The company's cost of capital is 12%.
- 01Expected return = $150,000 over 3 years
- 02Year 1: $40,000 ÷ 1.12 = $35,714
- 03Year 2: $50,000 ÷ 1.12² = $39,860
- 04Year 3: $60,000 ÷ 1.12³ = $42,707
- 05NPV = $35,714 + $39,860 + $42,707 − $100,000 = $18,281
Result
The project has a positive NPV of $18,281, meaning it generates returns above the 12% cost of capital. The $150K in nominal future revenue is worth $118,281 in today's dollars.
Why This Matters
Investment decisions
TVM helps you compare investments with different timeframes on an apples-to-apples basis. A project returning $200K in 1 year is worth more than one returning $250K in 5 years at any discount rate above approximately 4.6%, because the present value of $250K in 5 years at 10% is only $155K. Without TVM, nominal comparisons consistently mislead decision-makers toward longer-return options that appear larger.
Contract negotiation
Receiving $120K upfront is better than $130K spread over 12 months at any discount rate above 8.3%, a calculation that is invisible without TVM. Quantifying the value of early payment gives negotiators a precise number to work with when evaluating extended payment terms, installment arrangements, or deferred compensation structures in client contracts or employment agreements.
Business valuation
All DCF (discounted cash flow) valuations rely entirely on TVM principles. Future cash flows are discounted to present value using the required rate of return to determine what a business is worth today. NYU Stern research shows that DCF valuation is the primary methodology used in over 70% of M&A transactions above $50 million, making TVM literacy essential for any business owner considering acquisition or sale.
Common Mistakes
Ignoring inflation
A nominal 10% return with 3% inflation is only a 7% real return in purchasing power terms. Use real, inflation-adjusted rates for long-term projections covering 5 or more years to avoid overestimating actual purchasing power. The Federal Reserve targets 2% inflation, meaning a 20-year projection at nominal rates overstates real returns by 49% compared to inflation-adjusted analysis using the same underlying cash flow assumptions.
Using the wrong discount rate
Too low a discount rate overvalues future cash flows and makes weak investments appear attractive; too high a discount rate undervalues them and causes businesses to reject genuinely profitable projects. Use WACC for business projects to reflect the blended cost of debt and equity capital, and use the risk-free rate plus an appropriate risk premium for investment comparisons, matching the rate to the risk profile of the specific cash flows being discounted.
Not discounting at all
Comparing $100K today to $120K in 3 years without discounting ignores opportunity cost entirely. At an 8% annual return, $100K today grows to $125,971 in 3 years, making the immediate $100K the superior option despite its lower nominal value. This mistake is most common in contract negotiations and CapEx decisions where the upfront versus deferred framing makes the larger future number feel more attractive than it actually is.
Industry Benchmarks
Source: NYU Stern Damodaran Financial Analysis Database 2025