Money Market, Day Count, and Annuity Rates

Rate conventions for short-term instruments, elapsed-day calculations, banker-year assumptions, and annuity cash flows.

This branch covers rate labels whose meaning depends on how days or payment streams are measured. Actual/360 uses actual elapsed days over a 360-day denominator, while Banker’s Year explains the broader 360-day assumption.

Money Market Yield addresses annualized quotations for short-term instruments. Annuity Rate applies to repeated cash flows rather than a single short-term accrual.

Before comparing rates, verify the quote type, day-count denominator, start and end dates, compounding, payment timing, fees, and governing document. A numerical difference can come from the quotation convention rather than from a different economic return or borrowing cost.

In this section

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Actual/360

Day-count convention that divides the actual elapsed days in an interest period by a 360-day denominator.

Annuity Rate

Ambiguous term that can mean an annuity valuation rate, contract crediting rate, or payout-to-premium conversion rate.

Banker's Year

Traditional 360-day annual basis used in some interest calculations, with the day numerator defined separately by the applicable convention.

Money Market Yield

Simple annualized yield for a short-term instrument based on purchase price, holding-period income, and an Actual/360 convention.

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