Unconventional fiscal policy uses announcements of future increases in consumption taxes to generate inflation expectations and accelerate consumption expenditure. It is budget neutral and time consistent. We exploit a unique natural experiment for an empirical test of the effectiveness of unconventional fiscal policy. To comply with European Union law, the German government announced in November 2005 an unexpected 3-percentage-point increase in value-added tax (VAT), effective in 2007. The shock increased households' inflation expectations during 2006 and actual in ation in 2007. Germans' willingness to purchase durables increased by 34% after the shock, compared to before and to matched households in other European countries not exposed to the VAT shock. Income, wealth effects, or intratemporal substitution cannot explain these results.