That is absolutely not true @fanfare. There are a number of things on a taxpayer's return where failure to file an extension, even when a refund is due, are not automatic if they are completed by 10/15 to include SEP contributions, many things related to foreign tax, and others. There are even a few tax court cases related to this. The form must be on file and the extension noted for a number of things or the return isn't considered "timely filed" and elections for various things can be, and often are, denied.
