The paper shows that a corporate tax policy which is thought to be neutral may have significant incentive effects. This result is established in a model with tax advantage to debt and expectations about a forthcoming tax reform. Investment spurt effects are established and compared to those of a firm with equity finance. A tax-cut cum base-broadening tax reform which leaves the long-run investment incentives of an all-equity firm unaffected is shown to cause a substantial short run investment hike. The findings are illustrated by numerical simulations indicating the magnitudes of the spurt effects.