Each partner bank is mapped to a specific custodial bank (details of this mapping can be found here). For reporting purposes, Raisin aggregates the interest you earned across a group of institutions under each custodian.
For example, if you earned:
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$15 from XYZ Bank, associated with Lewis & Clark Bank
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$20 from ABC Bank, associated with Lewis & Clark Bank
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$25 from DEF Bank, associated with Central Bank of Kansas City
You will receive 2 Form 1099-INTs:
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One form with Lewis & Clark Bank listed as the payer with an aggregated interest income of $35 ($15+$20)
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One form with the Central Bank of Kansas City listed as the payer with an aggregated interest income of $25