Investing

The cost of waiting to invest

"I'll start once I earn more / feel ready." It sounds responsible. But waiting has a price, and it's bigger than almost anyone guesses.

The S&P 500 over 100 years: what the track record shows

A century of S&P 500 data contains 25 recessions, two world wars, multiple crashes of 30% to 50%, and a long-run average annual return of roughly 10%. Understanding what that record includes matters as much as the number itself.

Tax-advantaged accounts: the 401(k) and Roth cheat sheet

The core difference between a 401(k) and a Roth IRA is when the tax break happens: before you invest or after. That timing decision, made once, shapes three decades of compound returns.

Compound interest on credit card debt: the math backwards

Compound interest is sold as the engine of wealth. The same engine runs on a credit-card balance, pointed the other way, compounding a little more each day.

Compound interest vs simple interest, in plain English

Two accounts start with $10,000 at 10%. Thirty years later one holds $40,000 and the other $174,000. The only difference is which kind of interest each paid.

What is a stock? A plain-English guide

The news says stocks went up. Your coworker bought some. But what is a stock, really? It's a tiny slice of a real business. And that's the whole idea.

What is an ETF? A plain-English guide

ETF: three letters you see everywhere, almost never explained. It just means a basket of many investments you can buy in one tap, like a single stock.

Bonds explained: a plain-English guide

Stocks get all the attention; bonds are the quiet ones in the corner. But a bond is simply a loan that pays you interest. The seatbelt of a steady portfolio.

Diversification: don't put all your eggs in one basket

Don't put all your eggs in one basket. In investing that saying has a name. Diversification. And it's one of the few free wins you actually get.

What is an index? The market's scoreboard explained

The news says "the market is up," pointing at the S&P 500. But what is that thing they keep pointing at? It's an index. A scoreboard for a slice of the market.

What is volatility? It's movement, not danger

People say "volatile" like it's a bad word. But volatility isn't danger. It's just movement. A price swinging around isn't the same as losing money.

Rebalancing your portfolio: reset the mix

You set up a balanced mix, and a year later it looks totally different. Not because you changed it, but because the market did. Fixing that drift is rebalancing.

Robo-advisors explained: investing on autopilot

You want to invest, but picking and managing funds sounds like a job you don't have. What if an app just did the whole thing for you? That's a robo-advisor.

Target-date funds explained: set-and-forget investing

What if one fund could pick your investments, spread your risk, and slowly make itself safer as you age. Without you touching it? That's a target-date fund.

Capital gains basics: the tax on your profit

You bought an investment, it went up, you sold it. Congrats, you made a profit. That profit has a name and a bit of tax attached: it's a capital gain.

Time in the market vs timing the market

"I'll invest when things calm down" is one of the most expensive sentences in money. You can't reliably time the market. But you can give your money time in it.

Expense ratios: how a 1% fee quietly eats your returns

A 1% fee feels like a rounding error. Over a lifetime it can quietly walk off with a third of your money. Because it steals not just the fee but all the growth it would have made.

The Rule of 72: how fast does your money double?

Want to do investing math in your head in three seconds? Divide 72 by your growth rate and you get the years it takes your money to double. It's the most useful trick in finance.

What is a dividend? A plain-English guide

Imagine owning a slice of a company that mails you cash every few months just for holding it. That's a dividend. One of the quietest, most pleasant parts of investing.

The 401(k) employer match is free money. Take it

There's one place you can get a guaranteed 100% return with zero risk: your employer's 401(k) match. Millions leave it on the table every year. Don't be one of them.

Risk tolerance: how much swing can you stomach?

Your money is down 25% overnight. Do you calmly make breakfast, or panic and sell? Your honest answer is your risk tolerance. And it matters more than any strategy.

What is a bear market, and why you shouldn't panic

Red arrows everywhere, scary headlines, the words "bear market." Your gut screams sell. That gut feeling is exactly how ordinary investors lose money.

How inflation quietly shrinks your savings

The cash in your bank account is slowly getting smaller, even though the number never drops. You're losing money by doing nothing. And most people don't realize how much.

Asset allocation by age: stocks vs bonds

Two investors, same money, same market. One ends up far richer or far calmer. The difference often isn't luck. It's how they split their money between stocks and bonds.

What is a brokerage account? Where investing actually happens

Lots of people never start investing for one silly reason: they don't know where the money goes. The answer is a brokerage account. And opening one is easier than ordering pizza.

The biggest investing mistake is never starting

The most common, most expensive investing mistake isn't a bold move at all. It's a quiet one: people wait, and wait, and never actually start.

Saving vs investing: the difference, in plain English

The words get used interchangeably, but they describe completely different jobs. Saving for retirement and investing for an emergency fund are both mistakes. And both are common. Here's the honest version.

Wealthsimple CDRs explained: what they are, and what nobody tells you about the downside

Buying Amazon stock in Canadian dollars sounds frictionless. The mechanism. Canadian Depositary Receipts. Has real benefits and real costs that nobody puts on the marketing page.

Investing·10 min read

How much do you really need to retire?

$1 million sounds like a lot until you do the math on 30 years of withdrawals. Here's what the real number looks like. And how to think about getting there.

What does $50/month become in 40 years?

$50/month is the price of skipping two takeout meals. Over 40 years it's the price of a paid-off retirement. Here's the math, broken down by how early you start.

Index funds explained: why boring beats clever

The investing strategy that beats most pros is the one that takes 20 minutes to set up and zero attention thereafter. Here's how it works and why it wins.

Dollar-cost averaging: does it actually work?

Conventional wisdom says DCA is always safer. The math says it depends. Here's the honest version, with examples.

The simple 3-fund portfolio

Most investors overcomplicate their portfolio. Three funds, total. Here's the exact recipe, the reasoning behind it, and how to actually buy it.

Why most active investors lose to the index

If the pros can't beat the index, why are you trying? Here's the math on active management's track record. And the structural reasons it doesn't work.

Roth vs Traditional IRA: a plain-English guide

Two account types. Most personal-finance writing makes the choice harder than it is. Here's the actual decision rule that covers almost everyone.

The 4% rule: what it is and why it matters even if you're not retiring

If you can withdraw 4% per year safely, then you need 25× your annual spending to retire. That's the entire FIRE movement in one sentence. And it changes how you think about earning today.

What does "the S&P 500 averages 10% a year" actually mean?

Real returns aren't smooth. Some years are +30%, some are -37%. But the long-run average is remarkably stable. And it's the foundation of every projection CostMe makes.

What is a mutual fund? Plain English

Many people put money in one pot; a manager buys a basket of investments with it; you own a slice. That's a mutual fund. Just mind the fees.

Compound interest, explained: why time beats money

Einstein supposedly called it the eighth wonder of the world. He didn't, but the math is wondrous anyway. And most people drastically underestimate it.

Index fund vs ETF: what's the difference?

'Index fund' describes what it owns; 'ETF' describes how you trade it. They often overlap. Find the low-fee one, buy it, and don't lose sleep over the rest.

Dividend reinvestment (DRIP) explained

Reinvest a dividend and you own a bit more, which pays a bigger dividend, which buys a bit more again. That's a DRIP. Compounding doing what it does best.

What is a bond ladder? Plain English

Split your money across bonds that mature at different times and cash comes due in steady steps instead of all at once. That's a bond ladder.

How fund fees add up over decades

A 1% fee is never just 1%. Taken yearly across decades, it steals not just the fee but all the growth that money would have made. The math always favors the cheaper fund.

Emergency fund vs investing: what comes first?

A basic cash cushion comes first, then investing. A safety net stops a surprise bill from forcing you to sell investments at the worst moment.

Brokerage vs retirement account, explained

The account you invest through changes the tax rules a lot. A brokerage is flexible with no tax perk; a retirement account is tax-favored but locked until later.

What is a money market fund? Plain English

It holds short-term, low-risk stuff and tries to stay steady while paying a little interest. A calm parking spot for cash you need soon. Not a path to wealth.

What is an IRA? Plain English

An IRA is a personal retirement account with a tax perk. It's an empty basket you fill with investments yourself. It doesn't grow on its own.