How to compare savings rates accurately
Two accounts advertising the same number can pay noticeably differently. The gap is in the conditions attached, not the number.
The first thing to check is whether the advertised figure is a rate or a yield. A yield accounts for compounding over a year and a plain rate does not, so the two are not directly comparable even when they look alike. Institutions are required to publish the yield, and that is the one to compare.
The second is whether the headline figure is introductory. A rate that applies for a few months and then reverts is a perfectly normal product, but the number worth comparing is the one that applies afterwards, because that is what most of the money will earn.
The third is the balance band. Some accounts pay the advertised figure only up to a ceiling, or only above a floor, and some pay it only in months where a set number of transactions happen on a linked account. These conditions are in the product's terms, not in the advertisement.
Last, check that the institution is covered by federal deposit insurance and in whose name. This is a yes-or-no fact, it is published, and it matters more than any difference in the rate.
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