Personal finance glossary: 45 essential terms

4

401(k)Invest: An employer-sponsored retirement account that lets you contribute pre-tax (traditional) or after-tax (Roth) dollars, often with an employer match. 2026 employee limit is $24,500 ($8,000 catch-up at 50+).

A

APR(Annual percentage rate)Borrow smart: The yearly cost of borrowing, including interest plus most fees. APR makes loans comparable; the higher it is, the more the loan costs you per year.
APY(Annual percentage yield)Budget: The yearly return on a savings account or CD, accounting for compounding. APY makes savings products comparable; the higher it is, the more interest you earn.
Asset allocationInvest: The mix of stocks, bonds, and cash in your portfolio. A common starting rule: hold a stock percentage roughly equal to 120 minus your age.

B

Backdoor Roth IRASave tax: A two-step move — contribute to a traditional IRA, then convert it to a Roth — used by high earners to bypass the Roth income limit. Watch for the pro-rata rule if you have pre-tax IRA money.

C

Capital gains taxSave tax: Tax on the profit from selling an investment. Held over a year, long-term rates are 0%, 15%, or 20% in 2026; held a year or less, ordinary income rates apply.
CD(Certificate of deposit)Budget: A bank deposit that locks in a fixed interest rate for a set term (3 months to 5+ years). You earn more than a savings account, but pay an early-withdrawal penalty if you cash out early.
Compound interestInvest: Interest earned on both your original deposit and on previously earned interest. Over decades, compounding is what makes small, consistent contributions grow into large balances.
Credit utilizationBorrow smart: The percent of your credit-card limit you're currently using. Keeping it under 30% (under 10% is better) is one of the biggest levers on your credit score.

D

Debt avalancheBudget: A debt-payoff method that targets the highest-interest balance first while making minimums on the rest. Saves the most interest mathematically.
Debt snowballBudget: A debt-payoff method that targets the smallest balance first regardless of interest rate. Costs slightly more in interest but builds momentum through quick wins.
DIME methodProtect: A life-insurance sizing rule: add Debt + Income (replaced for ~10 years) + Mortgage + Education costs to estimate how much coverage you need.
Dollar-cost averagingInvest: Investing a fixed amount on a regular schedule rather than all at once. Reduces the risk of investing right before a downturn at the cost of slightly lower long-run expected returns.

E

E-E-A-T(Experience, Expertise, Authoritativeness, Trustworthiness)General: Google's quality rubric for YMYL content. Sites covering money, health, or safety topics must show real expertise and credentials to rank well.
Emergency fundBudget: Liquid savings held in a high-yield account to cover 3–6 months of essential expenses. Keep it separate from your spending account so you don't dip into it.
ESPP(Employee stock purchase plan)Save tax: A workplace benefit that lets you buy company stock at a 5–15% discount via payroll deduction. The discount alone is usually a strong guaranteed return.
ETF(Exchange-traded fund)Invest: A basket of stocks or bonds that trades on an exchange like a single stock. Most ETFs are index funds with very low expense ratios.

F

FICO scoreBorrow smart: The credit score most U.S. lenders use, ranging 300–850. Payment history (35%) and credit utilization (30%) are the two biggest inputs.
FIRE(Financial Independence, Retire Early)Invest: A movement built around saving 50–70% of income to reach a portfolio that funds your life via the 4% rule. Variants include LeanFIRE, FatFIRE, and CoastFIRE.
FSA(Flexible spending account)Save tax: An employer-sponsored account funded with pre-tax dollars for medical or dependent-care expenses. Use-it-or-lose-it: most balances forfeit at year end.

H

HDHP(High-deductible health plan)Protect: A health-insurance plan with a higher deductible and lower premium. In 2026, an HDHP requires a minimum deductible of $1,700 (self) / $3,400 (family) — the threshold to qualify for an HSA.
HSA(Health savings account)Save tax: A triple-tax-advantaged account paired with an HDHP: pre-tax contributions, tax-free growth, tax-free withdrawals for qualified medical expenses. 2026 limit is $4,400 self / $8,750 family.
HYSA(High-yield savings account)Budget: A savings account at an online or fintech bank paying 5–20× the APY of a traditional bank. Standard place to park your emergency fund.

I

Index fundInvest: A mutual fund or ETF that tracks a market index (S&P 500, Total Stock Market, etc.) instead of trying to beat it. Low fees + broad diversification — the default for most long-term investors.
IRA(Individual retirement account)Invest: A retirement account you open yourself, not through an employer. 2026 limit is $7,500 ($1,100 catch-up at 50+); Roth IRA contributions are after-tax with tax-free withdrawals in retirement.

M

Marginal tax rateSave tax: The federal tax rate on your next dollar of income — not your average rate. Used to compare Roth vs. Traditional contributions and to estimate the value of a deduction.
Mega-backdoor RothSave tax: A workplace strategy that uses after-tax 401(k) contributions plus in-plan Roth conversions to move up to $46,000 of extra savings into Roth in 2026. Only works if your plan allows both steps.
Mortgage refinanceBorrow smart: Replacing your existing mortgage with a new one — usually for a lower rate, a shorter term, or to pull out equity. Pencils out when your break-even (closing costs / monthly savings) is under your remaining hold time.
Mutual fundInvest: A pooled investment that's priced once per day at market close. Most low-cost index mutual funds are functionally equivalent to their ETF counterparts.

N

Net worthBudget: Everything you own (assets) minus everything you owe (debts). The single best one-number metric of financial progress over time.

P

Pro-rata ruleSave tax: An IRS rule that taxes Roth conversions proportionally to the pre-tax balance across all your traditional IRAs. The reason backdoor Roths are messy if you already have pre-tax IRA money.

R

RMD(Required minimum distribution)Save tax: The minimum amount you must withdraw from a traditional IRA or 401(k) each year starting at age 73 (rising to 75 in 2033). Roth IRAs have no RMDs during your lifetime.
Roth conversionSave tax: Moving pre-tax retirement money into a Roth account, paying income tax on the converted amount today in exchange for tax-free withdrawals later. Best in low-income years.
Roth IRAInvest: An IRA funded with after-tax dollars. Qualified withdrawals — including all growth — are tax-free in retirement. 2026 contribution limit is $7,500 / $1,100 catch-up.

S

SECURE 2.0Save tax: The 2022 federal law that raised the RMD age, increased catch-up limits, and added a super catch-up for ages 60–63 starting in 2025. Key 2026 figures flow from it.
Sequence-of-returns riskInvest: The danger of a market crash early in retirement when you're withdrawing rather than contributing — bad sequencing can shorten a portfolio's lifespan even with the same average return.
Standard deductionSave tax: A flat amount you can subtract from taxable income without itemizing. 2026: $16,100 single, $32,200 MFJ, $24,150 head of household.

T

Tax-loss harvestingSave tax: Selling investments at a loss to offset capital gains or up to $3,000 of ordinary income, then reinvesting in a similar (not substantially identical) holding. Watch the wash-sale rule.
Term life insuranceProtect: Life insurance that covers a fixed period (10–30 years) for a low premium. Right answer for nearly everyone with dependents; whole life is almost always wrong for them.
Total-return investingInvest: An approach that focuses on total portfolio growth (capital gains plus dividends) rather than chasing high-yield stocks for income. Standard for accumulation-phase investors.

U

Umbrella insuranceProtect: A liability policy that sits on top of your auto and homeowners coverage, kicking in after their limits are exhausted. Cheap for the protection: $1M coverage typically runs $150–$300/year.

V

VestingInvest: The schedule on which employer-contributed money (401(k) match, RSUs, ESPP shares) becomes legally yours. Leave before you vest and you forfeit the unvested portion.

W

W-4Save tax: The IRS form you give your employer to set tax withholding from your paycheck. Update it after marriage, a new job, or any year you owe a large refund or surprise tax bill.
Wash-sale ruleSave tax: An IRS rule that disallows the tax loss if you buy a substantially identical security within 30 days before or after selling. The main constraint when tax-loss harvesting.

Y

YMYL(Your Money or Your Life)General: Google's label for high-stakes content categories (finance, medical, legal). YMYL pages are held to a higher quality bar — they need real expertise, citations, and trust signals.