Washington ? The price of a passport: $311,491 in back child support payments for a U.S. businessman now living in China; $46,000 for a musician seeking to perform overseas, and $45,849 for a man planning a Dominican Republic vacation.

The new passport requirements that have complicated travel this summer also have uncovered untold numbers of child support scofflaws and forced them to pay millions.

The State Department denies passports to noncustodial parents who owe more than $2,500 in child support. Once the parents make good on their debts, they can reapply for passports.

Now that millions of additional travelers need passports to fly back from Mexico, Canada, the Caribbean and South America, collections under the Passport Denial Program are on pace to about double this year, federal officials told The Associated Press.

In all, states have reported collecting at least $22.5 million through the program thus far in 2007. The money is then forwarded to the parent to whom it is owed.

Some people never learn.

A boxer paid $39,000 in back child support to the state of Nevada last year to get a passport, which he lost. This year, his promoter had to loan him $8,930 so he could pay off his new child support debts and get a new passport to fight overseas.

In one case last year, a man got his parents to pay his overdue child support – $50,498 to the state of Illinois.

“For us, it’s been amazing to see how people who owe back child support seem to be able to come up with good chunks of money when it involves needing their passport,” said Adolfo Capestany, spokesman for the state of Washington’s Division of Child Support. “Folks will do anything to get that passport, so it is a good collection tool.”

The $22.5 million reported to have been collected through the program this year is a conservative estimate. Some states voluntarily report the payments to the federal Office of Child Support Enforcement, but other states don’t.

It took all of 2006 to collect the same amount under the program, which began in 1998.

Also contributing to the increased collections was a drop in the threshold for reporting child support debts to the State Department, from $5,000 to $2,500.

The passport denial program is just one of several tools the government has to collect overdue child support. Overall collections totaled about $24 billion last year. The largest share by far – $20.1 billion – came from withholding from a worker’s paycheck.