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What it calculates: Coupon per Payment, Annual Coupon Income, Payments per Year.
Updated 5 June 2026 · Transparent assumptions
The rate is annual; the payment is the rate divided by the frequency
The coupon rate is always quoted annually. A 6% coupon on $1,000 of face value is $60 a year, and paying semi-annually means each payment is $30. Assuming the quoted rate is what arrives each period overstates income by the frequency — twice over for semi-annual, four times for quarterly.
The face value is what the rate applies to, not the price you paid. A bond bought at $950 still pays $60 a year if its face is $1,000 and its coupon is 6%. That distinction is what separates the coupon rate from the current yield, and it is why a discount bond yields more than its coupon.
The same $60 arrives sooner and can be reinvested
Two bonds paying $60 a year, one annually and one semi-annually, do not deliver identical value. The semi-annual bond pays $30 six months earlier, and that money can earn something for half a year. The effective annual yield is therefore slightly above the stated coupon rate.
The difference is small at modest rates — a 6% semi-annual coupon has an effective annual yield of 6.09% — and grows with the rate. It matters most for comparing bonds with different payment schedules, where the stated coupon alone makes them look equivalent when they are not.
Payment dates, not just annual totals, are what a budget needs
Most bonds pay on fixed dates six months apart, so a portfolio built from several bonds pays lumpy income unless the maturities are chosen to spread it. Laddering across issues with staggered payment months converts an annual total into something closer to a monthly income.
The annual figure here is the right input for a yield calculation; the per-payment figure is the right input for a cash-flow plan. Mixing the two is how income projections end up describing a year that does not match any actual month.
It is fixed, and everything else about the bond is not
A coupon is contractual and does not change with market rates, credit quality or inflation — which is its strength and its weakness. Fixed income loses purchasing power whenever inflation exceeds the coupon, and the payment does not adjust.
Floating-rate notes, inflation-linked bonds and zero-coupon bonds all behave differently: the first resets periodically, the second indexes the principal, and the third pays nothing until maturity. This calculation applies only to a conventional fixed-coupon bond.
Sources & References
Figures on this page are checked against primary, authoritative sources. Links open in a new tab.
Bond YieldYield to maturity, current yield, and annual coupon income from price, face value, and coupon rate.
Bond PriceWhat a bond is worth today at a given yield, with the premium or discount to par and the coupon stream behind it.
InvestmentProject lump-sum and regular-contribution growth, plan a goal, and solve future vs present value, with fees and inflation.
Regular InvestmentProject how regular monthly contributions grow over time — SIP-style investing, dollar-cost averaging, inflation-adjusted value, and long-term goals.
Returns are assumptions, not guarantees. Actual results may vary because of market performance, taxes, fees, inflation, and timing. This is an educational projection, not investment advice.
Published the calculator with its formula, worked example, assumptions, limitations and a bespoke guide, and added an automated formula test suite covering it.
Tested each coupon amount, the annual coupon total and the payments-per-year count against the face value and rate entered.
Tested that doubling the frequency halves each payment while leaving annual coupon income unchanged.
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