Yes,you can file an amended return up to three years after your original return was due.
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However, you might not be able to go back and retro-actively change for prior years. Definitely this year as it isn't even April 15th yet. But I would talk to a preparer before you go amending any returns where you did not have an SSN on April 15th of the following year.
If tax ID and SS# both lead back to your identity, is that not sufficient?
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