When Will US Debt Hit The Wall?

June 25, 2015

As I see it, the following are true:

  • Debt is increasing far more rapidly than growth in the underlying economies that must support that debt. Although this is also true in Japan, the UK, and Europe, I’ll focus on the US.
  • Revenue is increasing but less rapidly than debt. This is a problem.
  • There will come a time when the interest payments on exponentially increasing government debt will exceed what the economy can support. Call that point “hitting the wall.”
  • Higher interest rates will cause the US economy to “hit the wall” sooner. Lower interest rates merely delay the “day of reckoning.”


Examine the log scale graph of US government revenues for the past 30 years.  The exponential rate is about 4.6% per year.

Total official US debt is over $18 Trillion but some of that is “Intra-governmental debt” – such as debt to the social security program.  The remaining portion that is actually owed to pension funds, individuals, sovereign governments etc. is about $13 Trillion.  It is increasing rapidly, thanks to out of control spending far in excess of revenues.

Date                        Public Debt          Intra-governmental          Total

                                In $ Trillions                      Debt                        Debt

9/30/2008                     $5.81                         $4.22                     $10.03

9/30/2014                   $12.78                         $5.04                     $17.82

Rate of Increase             14%                            3%                         10%


It seems likely that revenues will decline in the coming recession, while expenses will probably increase for social programs, bailouts, and another war.  Assume revenues optimistically increase at the historical average of 4.6% per year and public debt only increases at 14% per year.  A more likely scenario is lower revenue and higher debt increases, for many reasons, not discussed here.

When does an economy “hit the wall?”

  • When interest expense exceeds revenues? Yes, but probably well before that.
  • When confidence in the currency and/or government fails?
  • When total interest expense exceeds say 1/3 of government revenue? Yes, or perhaps well before that point.

 We don’t know.  Assume we delay “hitting the wall” until interest expense equals 1/3 of revenue.  But that is dependent upon the total interest expense which is determined by the blended interest rate.

Year            Estimated Revenue      Estimated Public         Implied MAX

                                                   Debt                        Interest Rate

2015                      $3.16                       $14.6                       7.2%

2020                      $3.96                       $28.1                       4.7%

2025                      $4.95                       $54.0                        3.0%

2030                      $6.20                     $104.0                        2.0%

Assuming that revenue increases 4.6% per year, public debt increases 14% per year, and that a maximum of 1/3 of revenue can be used for paying interest, the blended interest rate in 2030 cannot exceed 2%.  Washington, we have a problem!

Much can happen between now and 2030 and these exponential projections are unlikely to be realized.  The consequences of more QE, uncontrolled spending, more wars, and a weakening economy could be worse or better.

Regardless, if the maximum acceptable interest rate is 2% in 2030, or a few years before or after, there is a problem!


  • Reduce spending. I’ll believe it when I see it.
  • Increase taxes. Why use a Band-Aid to fix a broken leg?
  • Hyperinflation:  Is the “cure” worse than the disease?
  • Vote in new politicians. Really?  You actually believe that?
  • Your call. What do you think?

This tiny exercise tells me that western economies are accelerating toward a wall, there are only a few years or perhaps a decade or two remaining before a major reset must occur, and that the time for delusional thinking is nearly gone.

What have you done to prepare for when one or many western economies “hit the wall?”  Gold and silver might be better answers than devaluing currencies, overpriced bonds, or levitated stocks.

Share your opinions in a comment and let others, including myself, learn from your thoughts.


Gary Christenson

The Deviant Investor

GE ChristensonGary Christenson is the owner and writer for the popular and contrarian investment site Deviant Investor and the author of the book, “Gold Value and Gold Prices 1971 – 2021.” He is a retired accountant and business manager with 30 years of experience studying markets, investing, and trading. He writes about investing, gold, silver, the economy and central banking.

Peru became the world’s largest producer of silver in 2012.