On 1/1/07, 100% Owner of Company A buys 85% of Company B. Company A and B have roughly the same number of employees. Company A has a 401(k) plan, company B does not. For coverage testing, I believe the transition rules allow for the exclusion of Company B through the 2008 plan year. They have to be counted for testing in Company A's plan starting 1/1/09.

Company A would like to allow Company B employees to make 401k contributions now in 2007, but would want to keep them out of the match and profit sharing until allocations until 1/1/2009. Can they pick and choose which plan components to have the transition period apply too, or is it all or nothing?

Thanks

All or nothing.

So let them in but have two years of service to recieve company contributions. Would have to be 100% vested. Or start separate plan with deferral only and then merge the two 1/01/09.