The net cost is a measure of cash flow requirements, not the bottom-line cost of college. The net cost will correspond to the expected family contribution (EFC) and will be similar at most colleges. If there are significant differences in net cost, it may be a sign of unusual circumstances that were taken into account at one college but not the others. Thus, families should compare college financial aid award letters based on the out-of-pocket cost and not the net cost. If the difference in out-of-pocket cost is less than $500, the difference is not significant enough to affect.