BEIJING, Oct 14 (Reuters) - China's outstanding total social financing (TSF) rose to 280.07 trillion yuan ($41.6 trillion) at the end of September, up 13.5% from a year earlier and compared with 13.3% in August, the central bank said on Wednesday.

TSF includes off-balance-sheet forms of financing that exist outside the conventional bank lending system, such as initial public offerings, loans from trust companies and bond sales.

In September, TSF fell to 3.48 trillion yuan from 3.58 trillion yuan in August. Analysts polled by Reuters had expected September TSF of 3.15 trillion yuan. ($1 = 6.7313 Chinese yuan) (Reporting by Lusha Zhang and Ryan Woo; Editing by Jacqueline Wong)