The acting head of the Internal Revenue Service will resign in the wake of a deal struck on behalf of the agency that will see it share tax data on undocumented immigrants. Melanie Krause, a commissioner at the IRS who is the third person to serve as its chief since the start of the year, will pack up her desk as part of the deferred resignation program offered by the Trump administration, the Treasury Department announced Tuesday. The news of her plans to leave the federal agency comes less than a week before the deadline for individual tax returns.