APR is the yearly interest rate a lender charges on money you borrow, from a credit card to a car loan. It is the price of the debt: a $5,000 balance at 22% APR is charged interest every month on whatever you still owe. The higher the APR, the more it costs to carry the balance — the same compounding that grows an investment works against you here.
Investing & FIRE glossary
This glossary defines the core investing and FIRE terms in plain English — from compound interest and expense ratios to the 4% rule and Coast FIRE. Each entry is a short, jargon-free explanation you can read in seconds, with a link to the CoinGarden calculator or guide that puts the concept to work.
- # APR (annual percentage rate)
- # APY (annual percentage yield)
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APY is the yearly return on savings or an investment once compounding is counted in, which makes it the honest number for comparing offers. Because interest earns its own interest, an account paying 5% compounded monthly ends up with an APY a little above 5%. Where APR is what you pay to borrow, APY is what you earn to save.
- # Asset allocation
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Asset allocation is how you split your money across different types of investments — such as stocks, bonds, and cash. The mix shapes both your expected return and how much your portfolio swings in value. Many investors hold more stocks when their time horizon is long and shift toward steadier assets as they get closer to needing the money.
See: Investor Type Quiz
- # Basis points
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A basis point is one-hundredth of a percent (0.01%), so 100 basis points equal 1%. Investing costs and interest-rate changes are often quoted this way to avoid confusion — a fund charging "25 basis points" costs 0.25% a year. The term is abbreviated "bps".
See: Fund Fees Explained
- # Bear market
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A bear market is a stretch when prices fall roughly 20% or more from a recent peak and stay down for a while. It feels alarming, but it is a normal part of investing — every long-term investor lives through several. The real test is whether you can keep contributing instead of selling, because a drop only becomes a permanent loss once you lock it in.
See: Investor Type Quiz
- # Bond
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A bond is a loan you make to a government or company in exchange for regular interest and your money back on a set date. Bonds usually swing less than stocks, so they add steadiness to a portfolio — the trade-off is lower expected long-term growth. Many investors hold both: stocks for growth, bonds to soften the ride.
- # Budget (50/30/20 rule)
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A budget is a plan for the money you already manage — it makes your spending visible so you can point it where you actually want it to go. A popular starting framework is the 50/30/20 rule: roughly 50% of after-tax income to needs, 30% to wants, and 20% to savings. Treat the split as a flexible compass, not a pass-or-fail test.
- # Bull market
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A bull market is an extended run of rising prices and optimism — the pleasant counterpart to a bear market. Most of investing's long-term gains are made during these stretches, which is why staying invested matters. The quiet danger is complacency: feeling brilliant while everything rises, then panicking in the next downturn.
See: Investor Type Quiz
- # Coast FIRE
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Coast FIRE is the point where your existing investments are already large enough to grow into your full retirement target on their own, without any further contributions. Once you reach it, compounding does the heavy lifting and you only need to earn enough to cover current expenses. It is a milestone on the way to full financial independence, not the finish line.
- # Compound interest
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Compound interest is the return you earn on both your original money and on the returns it has already generated. Because each period’s growth is added to the base for the next period, the balance grows faster and faster over time — growth builds on growth. The longer money compounds, the more dramatic the effect becomes.
- # Compounding frequency
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Compounding frequency is how often earnings are added back to your balance — yearly, monthly, or daily. The more often it compounds, the slightly faster money grows, because each new bit of interest starts earning sooner. The effect is real but small; how much you invest, and for how long, matter far more than whether it compounds monthly or daily.
- # Debt avalanche
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The avalanche method pays off your debts starting with the highest interest rate, while paying the minimum on the rest. Mathematically it costs the least interest and clears everything fastest. It works best when watching the numbers fall is motivation enough to keep going.
- # Debt snowball
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The snowball method pays off your smallest balance first, then rolls that freed-up payment onto the next debt. It usually costs a little more interest than the avalanche, but clearing a whole debt early gives a win that keeps many people going. The best method is the one you will actually stick with.
- # Diversification
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Diversification means spreading your money across many investments so that no single one can sink your whole portfolio. When holdings do not all move together, a loss in one can be offset by stability or gains in others. It reduces the risk tied to any one company, sector, or country, though it cannot remove market-wide risk.
- # Dividend
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A dividend is a share of a company's profits paid out to the people who own its stock, usually every quarter. You can take the cash or reinvest it to buy more shares. Not every company pays one — younger firms often reinvest their profits to grow instead — and no dividend is ever guaranteed.
- # Dividend yield
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Dividend yield is the annual dividend divided by the share price, shown as a percentage — so a $2 dividend on a $50 share is a 4% yield. It tells you how much income a holding pays relative to what it costs. A very high yield can be a warning rather than a bargain, since it often means the price has fallen because the payout looks shaky.
- # Dollar-cost averaging
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Dollar-cost averaging (DCA) is investing a fixed amount at regular intervals — say every month — regardless of price. You automatically buy more shares when prices are low and fewer when they are high, which removes the pressure to time the market. It is how most people invest through payroll deductions or automatic transfers.
- # Drawdown
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A drawdown is the drop from an investment’s peak value to its lowest point before it recovers, usually shown as a percentage. It measures how far "down" you would have been during a rough stretch. Knowing the drawdowns an investment has seen helps you judge whether you could stay invested through a decline.
See: Investor Type Quiz
- # DRIP (dividend reinvestment)
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A DRIP, or dividend reinvestment plan, automatically uses your dividends to buy more shares instead of paying you the cash. This quietly turns income into compounding: the new shares pay their own dividends, which buy still more shares. Most brokerages let you switch it on with a single setting.
- # Emergency fund
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An emergency fund is a pool of easy-to-reach cash set aside for life's surprises, such as a job loss, a medical bill, or an urgent repair. Most people aim for three to six months of essential expenses, kept in a separate savings account rather than invested. It comes before serious investing because it stops a surprise from forcing you to sell at the worst possible moment.
See: Emergency Fund Guide
- # Employer match / 401(k)
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A 401(k) is a workplace retirement account in the United States that lets you invest part of your pay, often before tax. Many employers add a "match" — extra money based on what you contribute, up to a limit (for example, 50% of your contributions up to 6% of salary). An employer match is effectively free money and part of your total compensation.
- # ETF (exchange-traded fund)
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An ETF is a basket of investments — often tracking an index like the S&P 500 — that trades on a stock exchange like a single share. It gives you instant diversification in one purchase, usually at a low expense ratio. ETFs can be bought and sold throughout the trading day at market prices.
- # Expense ratio
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An expense ratio is the annual fee a fund or ETF charges, shown as a percentage of the money you have invested. A 0.20% ratio means $2 a year for every $1,000 invested, deducted automatically from the fund. Small differences compound: over decades, a high expense ratio can quietly erase a large share of your returns.
- # FIRE
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FIRE stands for Financial Independence, Retire Early — building enough invested wealth that paid work becomes optional. A common target is a portfolio worth about 25 times your annual expenses, which follows from the 4% rule. People pursue FIRE by saving a high share of their income and investing it for long-term growth.
- # Future value
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Future value is what a sum of money, or a series of contributions, is expected to be worth at a later date after earning a given rate of return. It is the core output of most investing calculators — turning "I invest this much now" into "this is roughly what it becomes". The result depends heavily on the return rate and the number of years.
- # Index fund
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An index fund is a fund that aims to match a market index — such as the S&P 500 — rather than trying to beat it. By simply holding everything in the index, it keeps costs very low and spreads your money across many companies at once. Low-cost index funds are a common building block of long-term portfolios.
See: Fund Fees Explained
- # Inflation
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Inflation is the gradual rise in prices over time, which means each unit of currency buys a little less than it used to. Even modest inflation erodes purchasing power over decades, so an investment must out-earn inflation to grow your wealth in real terms. This is why cash left uninvested tends to lose value over the long run.
See: Why Invest?
- # Liquidity
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Liquidity is how quickly you can turn something into spendable cash without losing much value. Money in a savings account is highly liquid; a house or a locked-in investment is not. It is why an emergency fund lives in plain savings rather than the market — you want it available the moment a surprise hits, not tied up while prices happen to be down.
See: Emergency Fund Guide
- # Lump-sum investing
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Lump-sum investing means putting a large amount of money to work all at once rather than spreading it out. Because markets tend to rise over time, investing a lump sum early has historically often beaten drip-feeding it in — but it also exposes the full amount to a possible near-term drop. It is the counterpart to dollar-cost averaging.
- # Minimum payment
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The minimum payment is the smallest amount a lender will accept on a debt each month to keep it in good standing. Pay only the minimum on a high-interest balance and most of it goes to interest, so the balance barely moves and you can stay in debt for years. Paying even a little more than the minimum is one of the biggest levers you have.
- # Nominal vs real return
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A nominal return is the raw percentage an investment earns; a real return is that figure after subtracting inflation. Real return reflects the actual change in what your money can buy. A 7% nominal return with 3% inflation is only about a 4% real return — and it is the real number that matters for future purchasing power.
See: Why Invest?
- # Principal
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Principal is the original amount of money you invest or deposit, before any interest or returns are added. Returns are calculated on top of the principal, and with compounding, on top of past returns too. Keeping your principal invested for longer gives compounding more to work with.
- # Rate of return (CAGR)
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A rate of return is the percentage gain or loss on an investment over a period. The compound annual growth rate (CAGR) expresses that as a single steady yearly rate — the constant rate that would turn your starting amount into the ending amount over the same time. CAGR is useful for comparing investments because it accounts for compounding rather than just averaging yearly results.
- # Rebalancing
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Rebalancing is periodically adjusting your holdings back to your target asset allocation after market moves have shifted them. If stocks surge, they may grow to a bigger share than you intended, so you trim them and top up whatever lagged. It is a disciplined way to keep your risk level roughly where you planned.
See: Investor Type Quiz
- # Risk tolerance
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Risk tolerance is how much fluctuation in your investments’ value you can handle — both financially and emotionally — without abandoning your plan. Someone with high risk tolerance can stay invested through steep drops; someone with low tolerance may sleep better with steadier assets. It is personal, and it often depends on your time horizon and temperament.
See: Investor Type Quiz
- # Safe withdrawal rate (4% rule)
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A safe withdrawal rate is the percentage of a retirement portfolio you can take out each year with a strong chance the money lasts. The well-known "4% rule" suggests withdrawing about 4% of your starting portfolio annually — which is why a common FIRE target is 25 times your yearly expenses. It is a planning guideline, not a guarantee; real outcomes depend on markets and how long you live.
- # Savings rate
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Your savings rate is the share of your income you put toward saving and investing — and it is the biggest lever over how soon you reach a goal, more than picking the perfect fund. A common starting point is around 15% of gross income, but any amount beats zero, and you can raise it a little at a time. Start where you are; even a small rate, kept up for years, adds up.
- # Stock
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A stock, or share, is a small slice of ownership in a single company. Owning it means you share in that company's growth and its setbacks, so individual stocks can rise or fall sharply. Most beginners get broad ownership more safely by holding hundreds of companies at once through a low-cost index fund, rather than betting on one.
- # Time horizon
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Your time horizon is how long until you need the money you are investing. A long horizon gives compounding more time to work and more room to ride out market dips, which is why long-term investors often accept more short-term ups and downs. A short horizon usually calls for steadier, less volatile holdings.
- # Time in the market vs timing the market
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Staying invested for the long run — "time in the market" — usually works out better than trying to jump in and out at the perfect moments, which is "timing the market". Short-term highs and lows are nearly impossible to predict, and missing even a handful of the market's best days can gut your long-run returns. Investing steadily and leaving it alone sidesteps the guessing game.
- # Vesting
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Vesting is the process of earning full ownership of employer-provided benefits — such as a 401(k) match or company shares — over time. Until you are "fully vested", you might forfeit some or all of those contributions if you leave the job. Your own contributions are always yours; vesting schedules apply only to the employer’s portion.
- # Volatility
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Volatility is how much an investment’s price swings up and down over time. Higher volatility means larger, faster moves in both directions — more potential reward but also a bumpier ride. It is a common measure of short-term risk, though it says nothing about the long-term direction of an investment.
See: Investor Type Quiz
Definitions are educational and general — not financial advice. Any figures are illustrative and match the assumptions used by our calculators.