• First comes the new tax hikes that Mr. Obama proposed on Monday. Capping itemized deductions and exemptions for the rich would take $405 billion from the private economy for 10 years starting in 2013. Taxing carried interest would raise $18 billion, and repealing tax incentives for oil and gas production would get $41 billion.

• These increases would coincide with the expiration of the tax credits, 100% expensing provisions and payroll tax breaks in Mr. Obama’s new jobs program. This would mean a tax hit of $240 billion on small business and workers. That’s the downside of temporary tax breaks and other job-creation gimmicks: The incentives quickly vanish, and perhaps so do the jobs.

So even if the White House is right that its latest stimulus plan will create “millions of jobs” through 2012, by this logic a $240 billion tax hike on small businesses in 2013 would cost the economy jobs. This tax wallop would arrive when even the White House says the unemployment rate will still be 7.4%.