Human capital earnings functions typically explain a small fraction of the total variation in earnings. The considerable uncertainty associated with expected future earnings streams enhances the desirability of a loans scheme for higher education possessing income contingent characteristics on the repayment side. The Higher Education Contribution Scheme (HECS) possesses this feature The profitability of higher education even after taking account of the HECS suggests there is scope for higher student contributions. Other possible modifications to the HECS include higher repayment rates, a change to the tax base, and a minimum repayment amount