A spread, also called a margin or asset fee, is a set percentage a fixed index annuity subtracts from an index's gain before crediting the rest to you. If the index rises 10% and the spread is 3%, you are credited 7%. It is another lever insurers use in place of, or alongside, a cap.
In plain terms: A percentage the insurer keeps off the top of the index's gain before paying you the rest.
A spread is like a service charge skimmed off the top of the index's gain. The insurer takes its cut first, and you keep what is left. So with a 4% spread, an index gain of 12% credits you 8%, while a flat or down year credits you zero because the floor still protects your principal. Spreads change and vary by product and state.
A spread quietly shapes your return the same way a cap does, just from the other direction. In a strong market a spread can cost you more than a cap; in a modest one it can cost less. Know which lever your product uses.
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