Account aggregation requirements
(iii) Account aggregation requirements(A) In general. To the extent a financial institution is required under chapter 4 to determine the aggregate balance or value of an account, the financial institution is required to aggregate the account balance or value of all accounts that are held (in whole or in part) by the same person and that are maintained by the financial institution or members of its expanded affiliated group, but only to the extent that the financial institution's computerized systems link the accounts by reference to a data element, such as client number, EIN, or foreign tax identifying number, and allow the account balances of such accounts to be aggregated. Notwithstanding the rules set forth in this paragraph (b)(4)(iii), a financial institution is required to aggregate the balance or value of accounts that it treats as consolidated obligations.