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Financial Glossary
APY measures the total amount of interest earned on a deposit account over one year, taking into account the effect of compound interest. Unlike simple interest rates, APY reflects how often interest compounds (daily, monthly, quarterly), making it the most accurate measure of an account's earning potential. Higher compounding frequency results in higher APY.
APY is the standardized measure that allows consumers to compare deposit account returns regardless of compounding frequency. Without APY, comparing a monthly-compounding account at 4.5% to a daily-compounding account at 4.45% would require complex calculations. APY normalizes these differences into a single figure representing the actual annual return. The formula for APY is: APY = (1 + r/n)^n - 1, where r is the nominal interest rate and n is the number of compounding periods per year. As n approaches infinity (continuous compounding), APY approaches e^r - 1. The difference between nominal rate and APY grows with the rate and compounding frequency.
APY determines how quickly your savings grow without any active work on your part. For emergency funds and short-term savings, a high APY account can meaningfully outpace inflation. On a $50,000 emergency fund, the difference between a 0.5% APY (traditional bank) and a 4.5% APY (high-yield savings) is $2,000 per year — equivalent to a small part-time job. For long-term investors, APY on fixed-income products like CDs provides predictable returns that complement more volatile stock market investments.
A savings account offering 4.50% interest compounded monthly has an APY of 4.59%. This means $10,000 deposited would grow to $10,459 after one year. The same 4.50% rate compounded daily would yield an APY of 4.60%. Always compare APYs rather than interest rates when evaluating savings accounts.
APY applies to deposit accounts (savings, CDs) and measures what you earn. APR applies to loans and measures what you pay. APY accounts for compound interest, while APR accounts for fees. Both are annualized rates that help consumers compare financial products.
More frequent compounding increases APY. Daily compounding yields a higher APY than monthly compounding at the same nominal interest rate. The difference is small for most accounts but becomes significant over longer periods and larger balances.
High-yield savings accounts currently offer APYs ranging from 3.5% to 5.0%, while traditional banks offer 0.01% to 0.50%. Online banks and credit unions typically offer the highest APYs. Always check whether the APY is promotional (limited-time) or ongoing.
For FDIC-insured deposit accounts, the APY is the annual return assuming you do not withdraw funds. However, APYs are variable and can change at any time. CDs may offer a fixed APY for the term. Unlike investments, FDIC-insured accounts cannot lose principal up to $250,000 per depositor.
Interest earned = Principal × APY. For monthly compounding, divide APY by 12 for approximate monthly return. For example, $25,000 at 4.5% APY earns approximately $1,125 in the first year, or about $94 per month. Actual amounts depend on the exact compounding schedule and any deposits or withdrawals.
Canada calculators use data from the following official government agencies:
Our Canadian calculators use federal and provincial tax brackets, CPP/QPP contribution rates, and EI premiums published by the Canada Revenue Agency (CRA). Economic data is sourced from Statistics Canada. Mortgage calculations use Bank of Canada rates and market averages. All figures are for educational purposes.
All tax brackets, contribution rates, and economic data used in our calculators are sourced from the official government publications listed above. Rates are updated at least annually to reflect the latest tax year and regulatory changes. Users should verify critical figures with official sources or qualified professionals.
Last updated: June 2026. Information may change; always verify with official sources.
Last Updated: July 2026 — Reviewed Against Official Sources
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