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What (who) is effective yield - definition
Wikipedia
The effective interest rate (EIR), effective annual interest rate, annual equivalent rate (AER) or simply effective rate is the percentage of interest on a loan or financial product if compound interest accumulates over a year during which no payments are made. It is the compound interest payable annually in arrears, based on the nominal interest rate. It is used to compare the interest rates between loans with different compounding periods, such as weekly, monthly, half-yearly or yearly.
Depending on the jurisdictional definition, the effective interest rate may be higher than the annual percentage rate (APR), since the APR method does not take compounding into account. By contrast, the EIR annualizes the periodic rate with compounding. EIR is the standard in the European Union and many other countries, while APR is often used in the United States.
The EIR is more relevant for borrowers who are short of income, because it computes the effects of compounding assuming no periodic payment of interest, so that future interest accrues on both the principal and the current interest. However, the APR reflects the annual total interest charge assuming periodic interest is paid as soon as it accrues. For example, if one borrows a principal debt of $1000 at an interest of 2% every month, and makes no monthly payments, the compounded debt at the end of the year is $1000 × (1.02)12 = $1268.24, or $268.24 of interest, making EIR 26.8%. By contrast, if the interest of $1000 × 0.02 = $20 is paid each month, but none of the principal, the annual interest is $20 × 12 = $240, making APR 24%.
The term nominal EIR or nominal APR can refer (subject to regulation) to an annualized rate that does not take into account front-fees and other costs.
Annual percentage yield or effective annual yield is the analogous concept for savings or investments, such as a certificate of deposit. Since a loan by a borrower is an investment for the lender, both terms can apply to the same transaction, depending on the point of view.
Effective annual interest or yield may be calculated or applied differently depending on circumstances, and the definition should be studied carefully. For example, a bank may compute effective yield on a portfolio of loans after subtracting expected losses and adding income from fees, meaning that the interest paid by each borrower may differ substantially from the bank's effective yield.
