For families living in the United States, the family contribution is 25% of income over $100,000 and 5% of student and parent assets over $150,000. One family contribution is provided per student, even when the custodial and non-custodial parent information is reviewed separately.

For families living outside of the United States, the family contribution is adjusted based on cost of living.

Princeton University's financial aid eligibility review, includes but is not limited to:

Income:Assets:
WagesCash (savings and checking)
Interest incomeStocks
Business or farm incomeCollege Savings Plans
Rental incomeReal estate equity (excluding the family's primary residence)
Child support receivedBusiness or farm net worth and/or value based on earnings
Annual contributions to retirement plans (e.g., 401K, IRA, SEP, SIMPLE) 
Foreign income exclusion 
Depreciation 
Business and/or property losses 
Net operating losses  

The Financial Aid Office may request additional information to accurately determine the student's need. The family contribution is meant to cover the billed expenses as well as non-billed transportation and miscellaneous expenses.