Common around the world, including in Europe, such a tax — called a value-added tax, or VAT — has not been seriously considered in the United States. But advocates say few other options can generate the kind of money the nation will need to avert fiscal calamity.

At a White House conference earlier this year on the government’s budget problems, a roomful of tax experts pleaded with Treasury Secretary Timothy F. Geithner to consider a VAT. A recent flurry of books and papers on the subject is attracting genuine, if furtive, interest in Congress. And last month, after wrestling with the White House over the massive deficits projected under Obama’s policies, the chairman of the Senate Budget Committee declared that a VAT should be part of the debate…

What would it cost? Emanuel argues in his book that a 10 percent VAT would pay for every American not entitled to Medicare or Medicaid to enroll in a health plan with no deductibles and minimal copayments. In his 2008 book, “100 Million Unnecessary Returns,” Yale law professor Michael J. Graetz estimates that a VAT of 10 to 14 percent would raise enough money to exempt families earning less than $100,000 — about 90 percent of households — from the income tax and would lower rates for everyone else.