It directly depends on the size of the labour organization. The example that I was given, and that I'll give to you, is that the AFL-CIO, which represents 56 unions that themselves represent 12 million unionized Americans, estimated before the change came in that it would cost them $1 million a year to comply with the new reporting requirements, but it was disclosed, as they have to, that in the first year it cost them $55,000, so it was substantially less than their original estimate.
On October 25th, 2012. See this statement in context.