This excerpt taken from the C 10-K filed Feb 23, 2007.
Income and Expense Recognition
Purchases and sales of securities and financial instruments, and their related income and expense, are recorded on a trade-date basis with net trading gains and losses recognized in the statement of operations. Interest income and interest expense are recorded on the accrual basis. Dividend income and dividend expense are recorded on the ex-dividend date, net of withholding taxes. Expenses are recorded on the accrual basis as incurred. Premiums and discounts on debt investments are amortized based on criteria determined in good faith by the General Partner over the remaining lives of the respective securities using the interest method.