The time value of money is the principle that a sum in hand now is worth more than an identical sum received later, since the money you already hold can be put to work and grow. Present value, future value and the discount rate turn that idea into a measurable number.
What is the time value of money?
The time value of money is the foundational idea behind nearly every calculation you will run into with annuities: money you can put to work right now carries more value than an identical amount arriving down the road, because whatever you already hold gets a head start earning interest. Every annuity quote, every income projection and every choice between a lump sum and payments spread over time traces back to this one principle.
How the time value of money works
Two calculations turn the idea into real numbers. Present value shrinks a future payment down to what an equivalent amount would be worth if you had it in hand right now. Future value runs the opposite direction, projecting what a current sum grows into after years of compounding. Both lean on a discount rate, the assumed rate of return used to move money across time.
Here is the relationship in a hypothetical example: $1,000 invested today at a 5% annual return grows to roughly $1,629 after 10 years. Run it the other direction, and $1,629 promised to you 10 years from now, discounted at that same 5%, is worth about $1,000 today. Present value and future value are simply two views of the same math, pointed in opposite directions.
Why it matters when you buy an annuity
This concept sits underneath nearly every decision you make with an annuity. It explains why a single premium immediate annuity is priced the way it is, why accepting a smaller lump sum today can be mathematically equal to a larger series of payments spread across many years, and even why a lottery winner's cash option is always smaller than the advertised jackpot paid out over time. Whenever you weigh a lump sum against a stream of income, whether from an annuity, a pension or a legal settlement, you are really comparing present values, and the discount rate used in that comparison changes the answer. A licensed strategist can run this math against your own numbers before you decide which option fits you.
Frequently asked questions
What does the time value of money mean?
Money you can put to work right now is worth more than the same amount arriving later, simply because the funds in hand today have a head start earning interest before the future payment ever shows up.
How do present value and future value relate to each other?
One shrinks a later payment down to its worth in current dollars, while the other grows a current sum forward across the years using compounding. Both rely on the same discount rate; they simply travel in opposite directions along the timeline.
Why does the time value of money matter for an annuity decision?
It underlies how a single premium immediate annuity is priced, why a smaller lump sum can be mathematically equal to a larger stream of future payments, and even why a lottery cash option is always smaller than the advertised jackpot.
Written and reviewed by
James Forren Warren
Licensed Retirement Income Strategist · License #20551202
James Forren Warren is a licensed Retirement Income Strategist with Tax Free Wealth Plan. For the past five years he has helped individuals and families turn their savings into retirement income they can count on. He writes and reviews the annuity research on this site and keeps it plain: what a product does, what it costs you, and who it actually fits.
Educational only, not investment, tax or legal advice. Tax Free Wealth Plan LLC is a licensed insurance agency, not a registered investment adviser or broker-dealer. Annuities are not bank deposits, are not FDIC insured and are not guaranteed by any government agency. Guarantees are backed solely by the claims-paying ability of the issuing insurance company. Features, rates and availability vary by state and change over time; the contract and disclosure documents govern.