What are the consequences of not filing statement of financial transaction or reportable account?
Non-furnishing of statement of financial transaction or reportable account will attract penalty under section 271FA. Penalty can be levied of Rs. 500 per day of default. 

However, section 285BA(5)​ (as discussed earlier) empower the tax authorities to issue a notice to the person directing him to file the statement within a period not exceeding 30 days from the date of service of such notice and in such a case person shall furnish the statement within the time specified in the notice. If person fails to file the statement within the specified time, then a penalty of Rs. 1,000 per day will be levied from the day immediately following the day on which the time specified in such notice for furnishing the statement expires.​

Further, with effect from Assessment Year 2023-24, a penalty of Rs. 5,000 would be levied on reporting financial institution if there is any inaccuracy in SFT and such inaccuracy is due to false or inaccurate information submitted by the holder of reportable accounts. The reporting financial institution may also recover such penalty amount from the holder of the reportable account.​