If you electronically file (e-file) your Married Filing Separate tax return before he files a joint, he will not be able to e-file the return. He could still print and mail a joint return, but the IRS would investigate since you would have already filed a separate return. You can also threaten him with legal action if file a joint return. The filing of a joint return requires the signature of both spouses. If he files a joint return it will require him to sign for you, whether done via mail or electronically.
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