How does filing for an extension of time to file a California income tax return affect the amount of tax owed? Group of answer choices 100% of the tax due can be paid when the tax return is ultimately filed, with no late payment penalty. The extension is for more time to file the tax return, not an extension of time to pay the tax due. A late-payment penalty will not be imposed if at least 80% of the tax due is paid by the regular tax return due date. The only way an extension will be approved is if all tax due has been paid by the original due date of the tax return.