A note before we begin
I have a finance education. Eleven years in the industry. Today I structure multi-million dollar financing deals.
And for most of my twenties, I didn't really understand money.
Not because the information didn't exist. Because no one ever looked me in the eye and said: this is your life — pay attention.
The first student loan. The first credit card. The first 401(k) form. The first time I lost a job and realized there was nothing to fall back on.
That's what happens when money gets discussed on the surface — enough to get by, never enough to get ahead.
This newsletter is me trying to be that someone — for you.
This issue: Compound Interest
Meet Maria and Carlos.
Both are 25. Both just landed their first real job. Both decide to invest $200 a month.
Maria starts at 25. Carlos starts at 35.
Same $200 a month. Same 7% average return. They both stop contributing at 65.
At 65, Maria has ~$525,000. Carlos has ~$245,000.
Maria only put in $24,000 more than Carlos. But she ended up with $280,000 more.
That gap isn't skill. It isn't luck. It's ten years — and a force called compound interest.
(Seven percent is a common long-term benchmark for a diversified U.S. stock portfolio, after inflation. Actual returns vary year to year — sometimes dramatically.)
What is compound interest?
Interest is money you earn on money.
Compound interest is money you earn on your money and on the interest your money already earned.
A snowball rolling downhill. It starts small. As it rolls, it picks up more snow. The bigger it gets, the faster it grows.
Your money works the same way:
Year 1: Invest $1,000 at 7%. Earn $70. You have $1,070.
Year 2: Earn 7% on $1,070 — not just the original $1,000. You have $1,144.90.
Year 3: Earn 7% on $1,144.90. You have $1,225.04.
You didn't add a dollar. Your money grew anyway.
That's compounding.
The paradox nobody warns you about
Compound interest doesn't care whose side it's on.
The same force that quietly builds your wealth over decades is the same force working against you when you carry credit card debt. Your balance doesn't just grow — it compounds.
It works for you when you invest. It works against you when you borrow.
Most people spend the first half of their financial lives on the wrong side of it without realizing.
The real numbers
$200 a month at 7%:
Years | You put in | You end up with |
|---|---|---|
10 | $24,000 | $35,000 |
20 | $48,000 | $105,000 |
30 | $72,000 | $245,000 |
40 | $96,000 | $525,000 |
The first decade feels boring. The last one is where the magic happens.
That's why starting early matters more than starting big.
What to do this week
You don't need a lot of money to start. You need to start.
Three things you can do right now:
Check your 401(k) match. If your employer offers one and you're not using it, you're leaving free money on the table.
No 401(k)? Open a Roth IRA if you're eligible. Even $25 a month into a broad index fund gets the snowball rolling.
Pick your number. How much can you set aside each month — $25, $100, $500? Write it down. Then go put it somewhere it can compound.
The best time to start was ten years ago.
The second best time is today.
Coming up in Issue #002: Time Value of Money — why a dollar today is worth more than a dollar tomorrow, and how understanding this changes every financial decision you make.
Andiamo Money is for educational purposes only. Not financial advice. Always consult a licensed professional before making financial decisions.