We conduct a laboratory experiment to analyze the effect transactions costs and inertia have on charitable giving. We conjecture that transaction costs will have a greater effect on donations if the solicitation is received when the opportunity cost of time is high. Inertia could become a factor if people intend to give, but postpone making the payment until they have more time, and having postponed making the donation once, keep doing so. We find evidence of a transaction cost effect, with the size of this effect depending on the opportunity cost of time, but no statistically significant inertia effect.