Credit to this account, as such deposits are made, all cash deposited with the company as security for the payment of bills. Deposits refunded should be charged to this account and credited to cash. Deposits applicable to uncollectible or worthless bills should, at the close of the fiscal year (or earlier, at the option of the accounting company), be credited to the account of the consumer involved and debited to this account.
220 CMR, 52.309