The Time Value of Money — The Idea That Runs All of Finance

If you understand one idea, you can understand every financial decision in commercial real estate: a dollar you have today is worth more than a dollar you'll have next year.

That's it. That's the whole foundation. Every DCF, every IRR, every NPV, every "stabilized cap rate" calculation — all of it is just a dressed-up version of that one principle.

This lesson makes sure you truly understand why.

The three reasons money has a time dimension

1. Opportunity cost

If you have $100 today, you can invest it. At a 5% return, you'd have $105 in a year. So receiving $100 next year instead of $100 today costs you $5 of potential earnings. That $5 is the opportunity cost of waiting.

Every financial decision involves opportunity cost. When a seller offers you a 5% cap rate deal, you're comparing it against a 4.5% treasury bond, a 7% private credit fund, a 12% stock index, and everything else you could do with the money. Cap rate by itself isn't the answer — it's the answer relative to your opportunity set.

2. Inflation

$100 today buys more stuff than $100 next year. If inflation runs at 3%, then $100 next year only buys $97 of today's stuff in real terms. Waiting for money means losing purchasing power, which is another form of cost.

This is why commercial real estate with built-in rent escalations is so valuable. A 10-year lease at flat rent sounds stable but is actually shrinking in real terms — if inflation runs 3% annually, Year 10 rent is worth about 74% of Year 1 rent in purchasing power. Built-in 3% escalations just keep you even; you need more to actually grow.

3. Risk

Money you're promised a year from now might not actually arrive. The tenant could go bankrupt. The market could crash. The deal could fall through. Future money is always less certain than present money, and you should demand extra compensation for that uncertainty.

This is why NNN leases with investment-grade tenants trade at lower cap rates than mom-and-pop NNN leases — the uncertainty is lower, so the discount for future cash flows is smaller, so the price per dollar of NOI is higher.

The core equation

All of finance is built on this:

Where:

• PV = present value (what a future amount is worth today)
• FV = future value (the amount you'll have or receive later)
• r = discount rate (your opportunity cost per period)
• t = number of periods

This equation says: to find what $1,000 received 5 years from now is worth today, divide by (1 + discount rate) raised to the 5th power.

Example. You'll receive $1,000 in 5 years. Your discount rate is 8% (meaning you could earn 8% on alternative investments).

PV = $1,000 / (1.08)^5 = $1,000 / 1.4693 = $680.58

So receiving $1,000 in 5 years is equivalent to receiving $680.58 today. If someone offered you $681 today or $1,000 in 5 years, the deal would be roughly a wash.

Flipping it around: future value

If you invest today, the future value of that investment is:

Example. You invest $100,000 today at 8% return for 10 years.

FV = $100,000 × (1.08)^10 = $100,000 × 2.159 = $215,892

So your $100,000 more than doubles over 10 years at 8% compound growth. This is why compounding matters enormously in real estate investing — it's the same math applied to cash flows, not just starting principal.

Why this changes how you value real estate

Here's the leap: a commercial real estate property is really just a stream of future cash flows (annual NOI payments plus an eventual sale proceed). Since money in the future is worth less than money today, the value of the property is the sum of each future cash flow discounted back to today.

This is the entire idea behind DCF (discounted cash flow) — you'll learn it in the next lesson. But the foundation is right here: every future dollar is worth less than a present dollar, and the size of the discount depends on when you get it and how risky it is.

The most important number: the discount rate

The discount rate r in those equations is the single most important number in any real estate valuation. It captures:

• Your opportunity cost (what you could earn elsewhere)
• Inflation expectations
• The risk premium for this specific investment

For commercial real estate, the discount rate is typically 8-15% depending on asset class and risk:

| Deal type | Typical discount rate | |---|---| | Stabilized NNN (investment-grade tenant) | 7-9% | | Stabilized multifamily | 8-10% | | Value-add multifamily | 10-14% | | Opportunistic / distressed | 14-18% | | Ground-up development | 15-22% |

A higher discount rate means you're treating the future cash flows as riskier, which lowers their present value, which means you'll pay less for the property. A lower discount rate means you trust the cash flows more and you'll pay more.

The insight that changes your perspective

Here's the thing that clicks for most new investors: cap rate is actually just the inverse of a crude discount rate.

A 6% cap rate roughly translates to "I'm discounting future cash flows at about 6% per year, assuming no growth." That's a simple, static form of discounting. A full DCF is a more sophisticated version that accounts for growth in cash flows, different cash flow patterns, and an eventual sale.

When someone asks "why do we care about DCF when we have cap rate?" — the answer is: DCF handles complexity that cap rate can't. Specifically:

• Growth: cap rate assumes flat NOI; DCF lets you model rising rents.
• Time-varying cash flows: cap rate assumes uniform income; DCF handles a ramp-up year or a vacant stub.
• Exit value: cap rate ignores what you eventually sell for; DCF bakes it in.
• Risk adjustment: cap rate is one number; DCF lets you discount risky and stable cash flows differently.

For simple stabilized deals, cap rate is usually enough. For value-add, development, or any deal where cash flows change over time, you need DCF.

The 3 key operations you'll use

Every CRE financial analysis you'll do uses one of three operations on the time-value-of-money equation:

1. "What's this future cash flow worth today?" → Present value

Used whenever you want to value a stream of future NOI or a future sale price.

2. "What will this investment grow to?" → Future value

Used for projecting what a portfolio will be worth, or for compound return calculations.

3. "What return am I earning given these cash flows and this price?" → IRR

Used to evaluate deals by their implied return, given a price and a projected cash flow stream. You'll learn this in Lesson 3.

That's all of finance. Everything else is layering on complexity.

What to take away

• A dollar today is worth more than a dollar tomorrow because of opportunity cost, inflation, and risk
• The core equation: PV = FV / (1 + r)^t
• The discount rate r captures your opportunity cost and the riskiness of the cash flows
• Cap rate is a simplified version of discounting — DCF is the full version
• Three operations matter: present value, future value, and IRR

Next lesson: discounted cash flow — the framework that makes all CRE valuation work.