The best economic idea we’ve heard in response to the coronavirus crisis is a payroll-tax suspension. President Trump restated his support for it at a recent press briefing, and for good reason: It would reward work and production rather than the growth of government. Republicans should rally around the idea as the centerpiece of their next economic revival plan.

The plan we recommend would cancel all payroll-tax collections from May 1 to the end of the year. This would suspend the Social Security and Medicare tax, known as...