It’s the government spending, stupid.

Here’s Brian Riedl on why the economy is a mess. Hint: Bush tax cuts aren’t “spending.” (By the way, on that first myth, and this is highly relevant with the news that the Obama administration has turned to former Clinton era budget director Jacob Lew, let’s not forget that Clinton had the benefit of the “peace dividend,” or slashing the defense budget from the 6-7% of GDP it had been in the Cold War to barely 3% it became after the fall of the Soviet Union. That’s a ton of moolah!)

[MYTH #1] • The Bush tax cuts wiped out last decade’s budget surpluses. Sen. John Kerry (D., Mass.), for example, has long blamed the tax cuts for having “taken a $5.6 trillion surplus and turned it into deficits as far as the eye can see.” That $5.6 trillion surplus never existed. It was a projection by the Congressional Budget Office (CBO) in January 2001 to cover the next decade. It assumed that late-1990s economic growth and the stock-market bubble (which had already peaked) would continue forever and generate record-high tax revenues. It assumed no recessions, no terrorist attacks, no wars, no natural disasters, and that all discretionary spending would fall to 1930s levels.

The projected $5.6 trillion surplus between 2002 and 2011 will more likely be a $6.1 trillion deficit through September 2011. So what was the cause of this dizzying, $11.7 trillion swing? I’ve analyzed CBO’s 28 subsequent budget baseline updates since January 2001. These updates reveal that the much-maligned Bush tax cuts, at $1.7 trillion, caused just 14% of the swing from projected surpluses to actual deficits (and that is according to a “static” analysis, excluding any revenues recovered from faster economic growth induced by the cuts).

The bulk of the swing resulted from economic and technical revisions (33%), other new spending (32%), net interest on the debt (12%), the 2009 stimulus (6%) and other tax cuts (3%). Specifically, the tax cuts for those earning more than $250,000 are responsible for just 4% of the swing. If there were no Bush tax cuts, runaway spending and economic factors would have guaranteed more than $4 trillion in deficits over the decade and kept the budget in deficit every year except 2007.

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Over the past 50 years, tax revenues have deviated little from their 18% of gross domestic product (GDP) average. Despite a temporary recession-induced dip, CBO projects that even if all Bush tax cuts are extended and the AMT is patched, tax revenues will rebound to 18.2% of GDP by 2020—slightly above the historical average. They will continue growing afterwards.Spending—which has averaged 20.3% of GDP over the past 50 years—won’t remain as stable. Using the budget baseline deficit of $13 trillion for the next decade as described above, CBO figures show spending surging to a peacetime record 26.5% of GDP by 2020 and also rising steeply thereafter.

Putting this together, the budget deficit, historically 2.3% of GDP, is projected to leap to 8.3% of GDP by 2020 under current policies. This will result from Washington taxing at 0.2% of GDP above the historical average but spending 6.2% above its historical average.

Entitlements and other obligations are driving the deficits. Specifically, Social Security, Medicare, Medicaid and net interest costs are projected to rise by 5.4% of GDP between 2008 and 2020. The Bush tax cuts are a convenient scapegoat for past and future budget woes. But it is the dramatic upward arc of federal spending that is the root of the problem.