We use a randomized controlled trial to examine how out-of-pocket costs affect contraceptive method choice, pregnancy, abortion, and childbirth among uninsured U.S. women. The study recruited women seeking care through Title X-a national family planning program subsidizing reproductive health services for low-income Americans-and randomized vouchers, making the full spectrum of contraception highly discounted or free. We find that subsidizing contraception has large and persistent effects on the choice of con- traceptive method, resulting in significantly fewer pregnancies and abortions at 26 months. The effects on births are inconclusive.