CD Return Calculator

• How to calculate CD returns?

  You calculate a CD's return by finding the maturity value with A = P(1 + r/n)^(nt), then subtracting your deposit for the dollar return, and for an annualised percentage, computing (A ÷ P)^(1/t) − 1 with t as the term in years. A second, annualised figure is useful because dollar returns alone do not show whether the CD is a good rate or simply a large deposit held for a long time — a $20,000 CD held for two years shows a bigger dollar return than a $2,000 CD held for one year at a better rate, even though the second CD is the stronger offer. On a $20,000 deposit at 4.20% APY over 24 months, the maturity value is $21,715.28, so the dollar return is $1,715.28, and because 4.20% is already quoted as APY, the annualised return equals that same 4.20% regardless of the two-year term. Return figures here are pre-tax; CD interest is taxed as ordinary income in the year it is credited.

• What is a good rate of return on a CD?

  A CD rate is generally competitive when it tracks close to the broader interest-rate environment banks operate in at the time, but rates move constantly, so there is no fixed number that stays a good benchmark for long. The more durable test is your real return: subtract the current inflation rate from the CD's APY, since the nominal rate alone does not show whether your money is gaining purchasing power or just keeping pace with rising prices. A CD paying 4.20% APY during 3% inflation delivers roughly 1.2% in real terms — modest, but positive, meaning the deposit grows faster than prices rise. On $20,000 over 24 months at 4.20% APY, the nominal payout is $21,715.28, a gain of $1,715.28, though the real gain in purchasing power is smaller once inflation is accounted for. Because CD interest is also taxed as ordinary income, the after-tax real return is lower still than the raw figure suggests.

• Is the CD payout the same as the return?

  No, the payout and the return are two different figures describing the same CD. The payout is the full amount you receive at maturity — your original deposit plus all the interest that accrued — while the return is only the interest portion, the amount the CD earned you above what you put in. The distinction matters because the payout can look like a large number even on a low-yielding CD simply because the deposit was large, while the return is the figure that reflects how well the CD performed. On a $20,000 deposit in a 24-month CD at 4.20% APY, the payout at maturity is $21,715.28, and subtracting the $20,000 deposit isolates the $1,715.28 return, the figure worth comparing against a competing offer. If the CD is closed before maturity, the payout can differ further, because an early withdrawal penalty is subtracted from the interest earned, and in an extreme case that penalty can reduce the payout below the deposit.

• Công thức chuẩn ngân hàng

  Dùng đúng các quy ước lãi kép và APY mà ngân hàng áp dụng theo Regulation DD.

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