Wave of Debt Payments Facing US Government

Those conditions are already beginning to change. Global investors are shifting money into riskier investments like stocks and corporate bonds, and they have been pouring money into fast-growing countries like Brazil and China.

The Fed, meanwhile, is already halting its efforts at tamping down long-term interest rates. Fed officials ended their $300 billion program to buy up Treasury bonds last month, and they have announced plans to stop buying mortgage-backed securities by the end of next March.

Eventually, though probably not until at least mid-2010, the Fed will also start raising its benchmark interest rate back to more historically normal levels.

The United States will not be the only government competing to refinance huge debt. Japan, Germany, Britain and other industrialized countries have even higher government debt loads, measured as a share of their gross domestic product, and they too borrowed heavily to combat the financial crisis and economic downturn. As the global economy recovers and businesses raise capital to finance their growth, all that new government debt is likely to put more upward pressure on interest rates.

Even a small increase in interest rates has a big impact. An increase of one percentage point in the Treasury’s average cost of borrowing would cost American taxpayers an extra $80 billion this year — about equal to the combined budgets of the Department of Energy and the Department of Education.

But that could seem like a relatively modest pinch. Alan Levenson, chief economist at T. Rowe Price, estimated that the Treasury’s tab for debt service this year would have been $221 billion higher if it had faced the same interest rates as it did last year.

The White House estimates that the government will have to borrow about $3.5 trillion more over the next three years. On top of that, the Treasury has to refinance, or roll over, a huge amount of short-term debt that was issued during the financial crisis. Treasury officials estimate that about 36 percent of the government’s marketable debt — about $1.6 trillion — is coming due in the months ahead.

To lock in low interest rates in the years ahead, Treasury officials are trying to replace one-month and three-month bills with 10-year and 30-year Treasury securities. That strategy will save taxpayers money in the long run. But it pushes up costs drastically in the short run, because interest rates are higher for long-term debt.

Adding to the pressure, the Fed is set to begin reversing some of the policies it has been using to prop up the economy. Wall Street firms advising the Treasury recently estimated that the Fed’s purchases of Treasury bonds and mortgage-backed securities pushed down long-term interest rates by about one-half of a percentage point. Removing that support could in itself add $40 billion to the government’s annual tab for debt service.

This month, the Treasury Department’s private-sector advisory committee on debt management warned of the risks ahead.

“Inflation, higher interest rate and rollover risk should be the primary concerns,” declared the Treasury Borrowing Advisory Committee, a group of market experts that provide guidance to the government, on Nov. 4.

“Clever debt management strategy,” the group said, “can’t completely substitute for prudent fiscal policy.”