Customer Margin Debit Balance — Regulation T Lending Receivable
Recording the receivable from customers who have borrowed funds to purchase securities on margin — a core asset and significant revenue source for broker-dealers.
| Account Name | Type | Debit ($) | Credit ($) |
|---|---|---|---|
| Receivable from Customers — Margin Debit Balances | Asset (+) | 2,500,000,000.00 | - |
| Cash / Firm Capital Deployed (Funding Margin Loans) | Asset (-) | - | 2,500,000,000.00 |
💡 Accountant's Note
Regulation T permits customers to borrow up to 50% of a qualifying security's purchase price. The amount borrowed is the 'debit balance' — a receivable accruing interest at the published margin interest rate. When account equity falls below FINRA's 25% maintenance margin, a margin call is issued — if unmet, positions are liquidated. Margin interest income can represent 15–30% of total revenues for retail brokerages. The loan is funded by rehypothecating customer securities (pledging margin account securities in the firm's own repos — permitted under Reg T) or firm capital.
Practitioner & Systems Framework
💻 ERP Architecture
Each customer's margin debit balance is tracked at account level. Daily interest accrues and is typically added to the balance monthly. Margin interest income is recognized on an accrual basis. Customer rehypothecation of securities (the source of much of the funding) must be disclosed to customers. Margin interest income is presented in 'Net interest revenues' on the income statement.
⚠️ Audit Flags
Reg T initial margin compliance (50% at time of purchase) and FINRA maintenance margin compliance (margin calls issued promptly, positions liquidated if calls not met) are primary tests. Credit quality concentration analysis — large debit balances in concentrated or volatile positions — represents significant credit risk exposure.
📄 Required Documentation
Customer margin account statements, aggregate debit balance report, Reg T initial margin compliance documentation, FINRA maintenance margin call log (issuance, response, liquidation), margin interest rate schedule and income accrual, and securities rehypothecation disclosure confirmation.
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