Wait, weren’t the tax cuts supposed to bankrupt the country to benefit the rich? It almost looks like the tax cuts — which took effect in January — are paying for themselves.

That wouldn’t be fair, either. As the CBO notes, the new payroll withholding scheduled hadn’t fully taken effect in January; companies don’t have to update their employee tax withholdings until the middle of this month. When that happens, monthly revenues from individual income taxes will likely slip.

But the latest CBO report does show how a growing economy can make up a lot of the difference between the advertised price of a tax cut and the actual impact on revenues.