Charitable giving by American corporations and individuals is in insufficient in meeting the escalating demands of those in need. One potential solution proposed in recent research is to allow consumers to pre-commit to a future donation (Andreoni and Serra-Garcia 2021b, 2021a; Breman 2011; Meyvis, Bennett, and Oppenheimer 2011), as donors are willing to contribute larger donations when their payments occur in the future compared to when they occur in the present (Breman 2011; Meyvis et al. 2011). We investigate whether pledges to donate in the future will actually increase donations overall. Consistent with previous research, we find that precommitment to donate in the future increases donation amounts. However, when we ask donors when they prefer to give, we find a strong preference for giving in the present. Donors dislike choosing to donate in the future and avoid doing so, even if it means giving to less preferred charities instead. Future donations via precommitment appear to produce conflicting intertemporal preferences between donation amounts (i.e., donate a larger amount in the future) and time of donation (i.e., choosing to give in the present over the future). With the aim of improving fundraising campaigns without violating donor preferences, we devise a simple intervention for non-profits to overcome these conflicting preferences to boost giving.