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I did the same thing with my significant other. We both filed already and he claimed me & I checked that someone could claim me. Our returns haven't been processed yet, just accepted. Which return does the IRS look at to determine eligibility for stimulus?  I'm not sure if it would be worth amending right now as the IRS would not process the amended returns for who knows how long. Is it best to leave alone for now and then amend later? If we do that would I then be given a stimulus check?