Form 5805 is used to calculate the penalty for underpaying your estimated taxes for California. If you received a check referencing that form, it would indicate that you were penalized in the current or previous year for underpaying your estimated tax and some or all of that penalty has been refunded to you. Without knowing your history as it relates to estimated taxes due and paid in, we wouldn't be able to furnish a more precise answer to your query.
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