AI Summary. An analysis finds a Social Security tax-increase package lowers the debt-to-GDP ratio by 14.3 percentage points, with 97% of that coming from smaller Social Security deficits rather than economic growth. A benefit-reduction package cuts the ratio by 29.2 percentage points, raising long-run GDP by 12.1% versus 0.4%.

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A Penn-Wharton simulation finds that restoring Social Security solvency with tax increases alone would cut debt/GDP by ~14pp by 2060, while a fix based only on benefit cuts would cut it by ~29pp.

How do benefit cuts and tax increases differ in reducing debt-to-GDP?

Core argument: The benefit-reduction package cuts the debt/GDP ratio by 29.2 percentage points in the long run, more than twice the 14.3 percentage points under the tax-increase package.

The first figure [in the gallery] decomposes the tax-increase reform package’s improvement to the debt/GDP ratio into separate effects: how much does it cut debt versus how much does it raise GDP? Almost all of the tax-increase plan’s improvement in debt/GDP comes from lowering federal debt by raising taxes. The plan has a small negative effect on the economy in the short run and a small positive effect in the long run. But 97% of its 14.3 percentage point long-run reduction in debt/GDP comes simply from reducing Social Security’s deficits. The economy is little-changed relative to a baseline in which Congress simply borrows to pay Social Security benefits. The benefit-reduction package [second figure in the gallery] tells a different story. It reduces debt/GDP by 29.2 percentage points, more than twice as much as the tax-increase package. Part of that comes from a larger reduction in debt: 17.2 percentage points versus 13.9. But the real kicker comes from higher long-run GDP: 12.1% under the benefit-reduction package versus just 0.4% under the tax-increase package.

Takeaways by Macro Roundup® AI

  1. The benefit-reduction package cuts the debt/GDP ratio by 29.2 percentage points in the long run, more than twice the 14.3 percentage points under the tax-increase package.
  2. Of the tax-increase plan’s 14.3 percentage point long-run reduction in debt/GDP, 97% comes from reducing Social Security’s deficits, leaving the economy little changed relative to a baseline in which Congress borrows to pay benefits.
  3. Long-run GDP rises 12.1% under the benefit-reduction package versus 0.4% under the tax-increase package, with debt falling 17.2 percentage points versus 13.9.