A FINMANGO GUIDE TO INVESTING

How to

become a

millionaire.

The math is simpler than you think. Start early, keep it boring, stay in the market.

Financial health, not

financial literacy.

finmango.org

Originally developed by Bob Gillingham • Updated 2026

WHAT YOU'LL LEARN

Six ideas that do

most of the work.

01

Compound interest

Time turns small money into big money.

02

Risk vs. return

Why stocks beat savings over decades.

03

Start early

An 8-year head start beats 38 years of catching up.

04

Keep costs low

Fees quietly steal a third of your returns.

05

Stay invested

The worst days sit right next to the best ones.

06

Use the right account

Roth IRAs grow tax-free. Take advantage.

COMPOUND INTEREST

Interest on your interest.

Compounding pays you on both your original money AND on the interest that money has already earned. Every year, the base you earn on gets bigger.

A = P(1 + r/n)^nt

A

what you end up with

P

principal (money in)

r

rate (decimal)

n

compounds / year

t

years

Never too early. Never too late. Starting today beats starting next year — always.

COMPOUND INTEREST

The Rule of 72.

Quick mental math: how long until your money doubles?

72

÷

your %

return

=

years to

double

Example: at a 6% return, 72 ÷ 6 = 12 years to double. At 9%, only 8 years.

COMPOUND INTEREST

$5,000 invested once. Left alone.

Same starting money. Different returns. Watch what happens.

At 12% over 48 years, one $5,000 becomes $1.28 million. Same money. Different rate.

COMPOUND INTEREST

One $2,000. Started at 15, 25, or 35.

A single $2,000 investment. 10% annual return (roughly the S&P 500's century-long average). Held until 65.

15

age

$296,623

at age 65

Started teenage years

25

age

$109,136

at age 65

Started post-college

35

age

$40,155

at age 65

Started mid-career

The 20-year head start turns the same $2,000 into 7.4× more money by 65.

02

CHAPTER

What you can

invest in.

Savings, bonds, stocks, and mutual funds — what each does and how they compare on risk and return.

ASSET TYPES

Three ways to put money to work.

Savings account

A loan to a bank

Your deposit funds the bank's lending. Super safe, FDIC-insured. Returns barely beat inflation.

avg. return ~0.5%

Bonds (fixed income)

A loan to a company or government

You're the lender. You get periodic interest payments and your principal back at maturity.

avg. return ~4%

Stocks (equities)

A piece of a company

You own a slice of the business. Value rises (or falls) with the company and the broader economy.

avg. return ~9%

Higher expected return comes with higher volatility. That trade-off is the whole game.

ASSET TYPES

Risk and return walk together.

Years to double your money at each asset class's historical average:

Savings account

Very low risk

0.5%

~144 yrs

to double

Bonds

Moderate risk

4%

18 years

to double

Stocks (S&P 500)

Higher volatility

9%

8 years

to double

If your time horizon is 10+ years, the math favors accepting more volatility for more growth.

ASSET TYPES

The market goes up. Over decades.

Dow Jones Industrial Average, 1900–2025. Log scale, because each gridline is a double.

1929 crash (worst ever)�Even then, the market never touched zero. Patient investors made it back.

From 68 to 44,000�The Dow has roughly 650×'d in 125 years — through wars, crashes, and crises.

ASSET TYPES

Bulls outrun bears.

Bull markets last longer and gain more than bear markets take away. That's the long-run arithmetic.

BULL MARKETS

Average duration

9.8 years

Average total return

+519%

Best run (1949–61)

+935%

BEAR MARKETS

Average duration

1.4 years

Average drawdown

−36%

Worst (1929–32)

−83%

Bulls run 7× longer than bears — and they climb further than bears fall.

START EARLY

Meet Maya and Marcus.

Twins. Identical lives. Same 12% return. Only their investing schedule differs.

MAYA • starts early

Starts investing at age

19

Invests per year

$2,000

Years investing

8

Then stops at age

26

Total contributed

$16,000

MARCUS • starts later

Starts investing at age

27

Invests per year

$2,000

Years investing

39

Keeps going through age

65

Total contributed

$78,000

Who ends up with more at 65?

START EARLY

Maya wins. And it's not close.

Maya invested 5× less money but walks away with more. Time did the heavy lifting.

MAYA • invested $16,000

$2,288,996

at age 65

143× her money back

MARCUS • invested $78,000

$1,532,166

at age 65

20× his money back

That's $167/month for 8 years vs. $167/month for 39 years. Time > timing.

MANAGING RISK

Don't put every egg

in one basket.

Diversification

Spreading your money across many investments — different companies, industries, and asset types.

Why it works: when one investment drops, others often hold steady or rise. Your overall ride gets smoother.

Risk (volatility)

How much an investment's value swings up and down over time.

Standard deviation measures this — low = smooth ride, high = stomach-churning.

​

Alpha and beta

describe a fund's behavior vs. the market.

MANAGING RISK

Mutual funds do three things for you.

A mutual fund pools money from many investors and buys a bundle of stocks, bonds, or both.

01

Professional management

Experienced portfolio managers pick investments so you don't have to research every company individually.

02

Instant diversification

One purchase buys you a slice of dozens (or thousands) of securities — risk spread across the basket.

03

Tailored objectives

Pick a fund that matches your goal: growth, income, retirement target-date, ESG, a sector, or the whole market.

MANAGING RISK

Big, medium, small, tiny.

"Market cap" is a company's total stock value. It's the easiest way to compare companies of similar size.

Mega-cap

>$200B

Apple, Microsoft, Nvidia

Large-cap

$10B – $200B

Target, Hershey, Nike

Mid-cap

$2B – $10B

Dunkin' Brands, Columbia

Small-cap

$300M – $2B

Red Robin, Zumiez

Micro-cap

<$300M

Emerging / early-stage

Bigger companies tend to be more stable. Smaller ones can grow faster — with more volatility along the way.

MANAGING RISK

Savings vehicles vs. investment vehicles.

Short-term money goes in savings vehicles. Long-term money goes in investment vehicles. Different jobs, different tools.

SAVINGS VEHICLES

● Savings account

● Checking account

● Money market account

● Certificates of Deposit (CDs)

High safety • Low return

Emergency fund, rent, vacation in <2 years

INVESTMENT VEHICLES

● Stocks

● Bonds

● Mutual funds & ETFs

● Real estate

● Commodities

Higher return • Higher volatility

Retirement, 10+ year goals, wealth-building

03

CHAPTER

Picking

good funds.

Evaluate any mutual fund with the 3Rs + E: Returns, Reviews, Risk, and Expenses. Avoid the three errors most investors make.

PICKING GOOD FUNDS

The 3Rs + E framework.

Every mutual fund can be evaluated on four dimensions. Master these and you can compare any two funds in minutes.

R

Returns

1-yr, 3-yr, 5-yr, and 10-yr performance. Compare to the ~9% S&P 500 long-run average.

R

Reviews

Morningstar star rating (1-5), sustainability score, and Lipper category ranking.

R

Risk

Standard deviation. Lower = smoother ride. Compare against funds in the same category.

E

Expenses

Expense ratio (aim <1%, ideally <0.2%) and no-load only. No commissions. Ever.

Sources: morningstar.com • money.usnews.com/funds • marketwatch.com

PICKING GOOD FUNDS

Three errors most investors make.

01

Ignoring expenses

Load fees and expense ratios above 1% can eat a third of your 20-year returns. Use no-load funds with expense ratios under 0.20%.

02

Chasing hot sectors

Last year's winner is rarely next year's winner. The top-performing sector moves around wildly — past performance doesn't guarantee future results.

03

Letting emotions drive

Panic-selling at the bottom and euphoria-buying at the top is how individual investors consistently underperform the market.

The good news: all three are avoidable just by knowing they exist.

PICKING GOOD FUNDS

Last year's #1 is rarely next year's #1.

Top-performing S&P 500 sectors by year. Notice how the winners jump around.

Own the whole market, not last year's winner.

PICKING GOOD FUNDS

Why passive index funds win.

An index fund holds every stock in a market index (like the S&P 500). You get the whole market's return — no stock-picking required.

✓

Very low fees

No team of analysts picking stocks = expense ratios as low as 0.02%.

✓

Tax efficient

Funds hold securities for the long haul — fewer sales, fewer taxable gains.

✓

Minimizes turnover

Buy and hold the index. Less trading = less friction, less cost.

✓

Full transparency

You always know exactly what you own — it's the index, published daily.

Over 10 years, ~90% of actively managed funds underperform their index.

PICKING GOOD FUNDS

Four great S&P 500 index funds.

All four track the same index. Pick based on where you already have an account and the minimum you can meet.

These four hold the 500 largest U.S. companies. Boring, cheap, effective.

PICKING GOOD FUNDS

Fees quietly steal your money.

Same $10,000 investment. Same 10% annual return. Different expense ratios. 20 years later:

A 2.5% fee costs you $24,552 versus a 0.02% fee — that's 37% of your gains.

STAYING INVESTED

Emotions are the enemy.

The cycle of market emotions — and why most investors buy high and sell low.

WHAT INVESTORS FEEL

Market up

"Get me in!" — euphoria, thrill

Market peaks

Anxiety → denial → fear

Market down

"Get me out!" — panic, despair

Market bottoms

Hopelessness, depression

WHAT SMART INVESTORS DO

DCA

Dollar-Cost Averaging

Invest the same dollar amount at the same interval — every paycheck, every month. You automatically buy more shares when prices are low and fewer when they're high. Emotion removed.

Automate your investing. Set it, forget it, let compounding work.

STAYING INVESTED

Two ways to reduce risk.

Over 30-year rolling periods, mixing stocks and bonds trades some return for a lot less volatility.

Younger? Lean heavier on stocks. Closer to retirement? Shift toward bonds for stability.

STAYING INVESTED

Time in the market > timing the market.

Growth of $1 across asset classes, 1926–2024. Compound annual returns in parentheses.

12.1%

$1 grew to

$38,000

Small-cap stocks

10.2%

$1 grew to

$7,400

Large-cap stocks

5.5%

$1 grew to

$150

Government bonds

3.4%

$1 grew to

$22

Treasury bills

Inflation averaged 2.9%. If you kept cash under the mattress, you lost money every year.

STAYING INVESTED

Not every year is a winner.

S&P 500 annual returns, 1974–2024. Most years positive; some years not. The average is what matters.

40 positive years out of 50

10 negative years out of 50

STAYING INVESTED

Short-term money doesn't belong in stocks.

2000 — 2002

Three down years in a row.

2000

−9.1%

2001

−11.9%

2002

−22.1%

Money you need in the next 2–5 years doesn't belong in the stock market.

Down payment, wedding, tuition, emergency fund → savings vehicles.

04

CHAPTER

The right

account.

Where you invest matters almost as much as what you invest in. Roth IRAs, Traditional IRAs, and brokerage accounts have very different tax treatments.

THE RIGHT ACCOUNT

Three accounts. Three tax treatments.

Brokerage

Taxable

Pay taxes on dividends and gains every year. Most flexible — no withdrawal rules or contribution limits.

When to use�After maxing retirement accounts

Traditional IRA

Tax-deferred

Contribute pre-tax dollars, deduct them from income now. Pay taxes when you withdraw in retirement.

When to use�If your tax rate is higher now than it'll be at 65

Roth IRA

Tax-free

Contribute after-tax dollars. Grows tax-free forever. No taxes on withdrawals after age 59½.

When to use�Most people, especially if you're young

The 2026 IRA contribution limit is $7,000 ($8,000 if you're 50+).

THE RIGHT ACCOUNT

Three questions when you open an account.

Q1

Brokerage or retirement account?

Taxable brokerage = most flexible. Retirement IRA = tax advantages, with rules. Almost everyone starts with an IRA.

Q2

Traditional IRA or Roth IRA?

Traditional = deduct now, tax later. Roth = tax now, grow tax-free forever. For most young investors: Roth wins.

Q3

Where does the money go?

Inside the account, choose investments. We suggest a no-load S&P 500 index fund. Low cost, high diversification, done.

Opening an account takes 15 minutes. Funding it is the hard part.

THE RIGHT ACCOUNT

"But what about Bitcoin?"

It's a fair question. Here's how a boring Roth IRA stacks up against a boring $400 crypto bet.

$400 IN A ROTH IRA

Small-cap value index, 40 years at ~12% historical average:

$37,220

Then withdraw 5% a year for 25 years = $108,045 in retirement income. Still leaves $156,712 behind.

$400 IN A CRYPTO BET

No long-term history. No underlying earnings. Pure volatility.

???

Could 10×. Could go to zero. If you "can afford to lose it," fine — but fund the Roth IRA first.

Boring gets you to a million. Exciting gets you a story.

GOING DEEPER

Active vs. passive.

Two philosophies of investing. Over long periods, passive wins the cost war — and often the performance war too.

PASSIVE (index funds)

✓ Low fees (0.02–0.15%)

✓ Tax efficient — low turnover

✓ Full transparency (you own the index)

✓ Beats most active funds after costs

ACTIVE (stock-pickers)

• Higher fees (0.5–2%)

• Flexibility to exit in crashes

• Hedging, short selling, tax strategies

• Needs a great manager to justify cost

On an after-tax basis over 10 years, active funds trail their index ~90% of the time.

WHAT TO DO NOW

Your action plan.

1

Build a 1-month emergency fund first

In a high-yield savings account. This is your "don't-panic" money.

2

Open a Roth IRA this week

Fidelity, Schwab, or Vanguard. 15 minutes. No minimum at Fidelity or Schwab.

3

Buy a no-load S&P 500 index fund

FXAIX, SWPPX, or VFIAX. Expense ratio under 0.05%. You now own 500 companies.

4

Automate monthly contributions

Even $50/month. Dollar-cost averaging removes the emotion.

5

Do nothing else for 30 years

Don't check the balance every day. Don't chase sectors. Don't panic-sell. Let it compound.

That's it. That's the whole plan. Start this week.

A FINMANGO GUIDE

Start today.

Thank future-you.

finmango.org • Financial health for everyone.