Business and farm groups are making a determined effort to rein in the estate tax before it expands significantly at the end of the year.

Thanks to a deal approved in late 2010, the estate tax is among a long list of fiscal issues awaiting action from Congress, including the extension of the George W. Bush-era tax rates and budget sequestration.

With a legislative logjam forming for the lame duck, lobbying groups such as the National Federation of Independent Business (NFIB) and the American Farm Bureau Federation are reminding lawmakers not to forget about their issue.