Basically, if you are over, then you are a chapter 13.  If you are under, then you are a chapter 7.  

Now remember that these numbers can be adjusted by child support payments (received or made), larger mortgages, huge tax debt, etc.  It is a gross overgeneralization to say that if you are over that figure then you MUST be a chapter 13, but this is the baseline we start with.  That being said, here are the current figures for Salt Lake County that we use on our Form 22C (6 month average of current monthly income and disposable income):

Single:      $52,021

Married:    $58,595

Married with 1 child:   $66,552

Married with 2 children:  $72,274

Married with 3 children:  $80,374

Married with 4 children:  $88,474

Married with 5 children:  $96,574

Married with 6 children:  $104,674

Married with 7 children:  $112,774

Married with 8 children:  $120,874

Married with 9 children:  $128,974

Married with 10 children:  $137,074