To claim the refundable part of the child, earned-income, adoption or college tax credits, filers would have to swear under penalty of perjury they are citizens or legal residents.
A tax-season formality could soon carry real legal weight for millions of families that claim the government’s largest refundable credits. Under a rule proposed by the Treasury Department and the Internal Revenue Service, anyone seeking the refundable portion of the child tax credit, the earned income tax credit, the adoption credit or the American Opportunity…