Washington ? President Barack Obama is pushing to speed up insurance coverage for young adults in their 20s — a key early benefit of his prized health care overhaul — but the law’s fine print suggests some won’t be able to sign up until next year.

What seemed like a simple solution so middle-class parents don’t have to worry about keeping kids insured as they move from home or school to work has generated lots of questions.

The law says employers must start offering extended coverage as early as Sept. 23, but many families will likely have to wait until Jan. 1, 2011 as health care plans typically operate on the calendar year.

On Tuesday, the IRS issued a notice reassuring employers that neither they nor their workers would face negative tax repercussions from expanding coverage immediately.