Fixed rate annuities, also called multi-year guaranteed annuities (MYGAs), are like CDs offered by insurance companies that are a surprisingly appealing fixed income investment alternative. MYGAs provide guaranteed returns similar to corporate bond yields (which are not the same as corporate bond returns).
Assets are protected by state guaranty funds, and gains are taxed only when the annuity is cashed in, providing a net tax benefit for near-retirees who expect their income tax rate to fall.
Unlike bonds, annuity rates are not set by trades through a market exchange. They are set by insurance companies. In a period where corporate bond yields rose 100 basis points between March 1 and May 20, insurance companies can finally begin increasing the benefits, or payout rates, of a variety of annuities.
Because insurance companies are slower to reprice than financial markets, it is possible that some jumped on the opportunity to increase rates faster than others.
MYGAs simply promise to provide a specific return on an initial investment at some future date. Variation in rates should be affected only by the expected returns on the insurance company's portfolio of investments, sales expenses and profits. Differences in characteristics such as expected mortality will not explain variation in promised returns.
MYGA rates tend to vary both by term and financial strength. Higher payouts are typically offered by firms with lower financial strength, and MYGAs with longer time to maturity.
There has always been variation in the payout rate across providers when you control for term and financial strength rating. Insurance companies manage their assets and liabilities differently; therefore, it should be expected that some carriers will offer more attractive rates than others.
If there is higher variation in rates, there is a bigger benefit to shopping around. If the payout rates are relatively tightly clustered, then the benefits to searching for the highest rate are likely less significant.