Visa, income tax, etc.

I understand from other reading that foreigners can get two kinds of visas:

• Tourist visas cost $20 each. They allow a foreigner to have a social visit for up to a month. These either cannot be renewed, or can be renewed only once. Children like my daughter will be allowed the same kind of entry for $5, although they do not get a receipt for this unlike the adults.
  
  
• Business visas cost $25 each. They can be renewed many times. Experience renewing is described on http://www.bayonpearnik.com/Cambodia/TravelInformation.html. I wonder how my daughter will fit into this category since she will be too young to do business?

Nationals of some countries as the Philippines may have a 21-day permit to visit the country without a visa.

I wonder how the business visa will tie into income tax? Ie. I will not draw a salary in Cambodia. The support for my living there will come from home. Will this money be considered as income taxable in Cambodia? Will my visa condition look for this income? Will a Cambodian company or national be regarded as my employer for the sake of this visa?

Do you know?