WASHINGTON (AP) — The Obama administration's surprise decision to delay a key requirement of the health care law for employers will cost the government $10 billion, the nonpartisan Congressional Budget Office said Tuesday.

While that's a big number, the report from the official budget scorekeeper for Congress also put the administration's recent move within a wider perspective. Overall, the delay for employers and other changes will raise the cost of the expanding coverage for the uninsured by less than 1 percent over 10 years from the budget agency's previous estimate in May, CBO said.

The White House announced earlier this month that it would delay a requirement for employers with 50 or more workers to offer affordable coverage, or face fines. Instead of going into effect next year, the provision was put off to 2015. A major concession to business groups, the delay took administration allies and adversaries by surprise.