The penalties for failing to file state taxes on time can vary by state, but they generally include monetary fines and interest charges. For example, in California, the [penalty for failing to file a state income tax return on time](https://www.ftb.ca.gov/pay/penalties-and-interest/index.html) is 5% of the tax due for each month or fraction of a month the return is late, up to a maximum of 25%. Additionally, interest is charged on the unpaid tax amount from the original due date until the date of payment. Some states may also impose additional penalties for intentional disregard or fraud. It’s crucial to file state tax returns and pay any taxes owed on time to avoid these costly penalties.
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