The first day that the IRS accepts electronic filing is usually around January 20.
You can file without your documents, the computer doesn't know the difference. Although technically, you are certifying that your return is true and correct, when you know it isn't.
But, then after you receive your documents, you will have to file an amended return. Amended returns take 5 months to process, assuming that the load stays the same. If more people try your plan, amended returns will get delayed even more. If the amended return results in you owing additional tax, you will have to pay back part or all of your original refund and you may get hit with interest and penalties.
And in some cases, your original tax return may get held up for investigation, especially if you are requesting a large refund based on W-2 or 1099 income when the payors have not yet submitted their copies to the IRS, making the IRS unable to automatically verify your income and withholding.
It's always recommended to wait until you have all your correct information.
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