The maximum amount your spouse or domestic partner may receive if he/she accompanies you while you are performing PCS travel is three-fourths of your daily per diem rate.
Code of Federal Regulations
[FTR Amdt. 98, 66 FR 58196, Nov. 20, 2001, as amended by FTR Amdt. 2010-06, 75 FR 67631, Nov. 3, 2010]