It involves a maried couple with problems(they hate each other) and tries to run from the IRS and land in an aimish society where they pretend to be some family's cousins from Mississippi.

For Richer or Poorer - 1997
Starring both Tim Allen and Kirstie Alley

For Richer or Poorer
A real estate hustler and his wife hide from the IRS among the Amish.