If you are fortunate enough to be in college right now, or if you ever went to college, then you are probably aware of the statistic that proclaims, “college graduates earn $1,000,000 more than high school graduates.” On this basis, you may have rationalized student debt as being a necessary liability for achieving this higher lifetime earning potential. It’s easy to see where this mythical million comes from: according to the oft-quoted statistic, by the time college grads retire they will be earning about $25,000 more per year than high school grads. Multiply that figure by 40 years of productive labor, and you get $1,000,000.
Student Loan Bubble recently discussed one major problem with this figure: new college graduates will only earn $7000 more per year than their high school peers, while shouldering significantly more debt than high school-educated workers. Additionally, high school grads will have at least four years worth of income before college grads even enter the workforce. The take home message from the first Student Loan Bubble article is that recent grads are facing a very real risk that they won’t be able to manage their student loan debt with such a meager income increase, at least during the first few years.
The first article provoked some interesting feedback such as the question, “what happens later in life?” In this article, Student Loan Bubble presents two graphs of lifetime earnings, which were calculated based on median income data from the US Census. The census provides data in 10-year aggregates, so Student Loan Bubble assumed a yearly pay raise that would make yearly earnings consistent with the census aggregates. After determining yearly income, Student Loan Bubble determined the cumulative income between the ages of 21 and 64.
The first graph presents yearly median incomes of High School and College graduates. You can click for a higher resolution version. Notice that the gap is not major while workers are young, and that by age 35, everyone has nearly achieved their maximum earning potential. It is difficult to perceive, but high school workers actually notice a slight pay decline between age 55 and 64.

Next, Student Loan Bubble presents cumulative earnings, and these results might surprise you. By the time workers are 64, college grads will have earned $1,991,574 while high school grads will have earned $1,258,998. These are median figures, which means that 50% of workers will earn less than these amounts. The difference in median lifetime earning is $732,576, which is less than 75% of the fabled $1,000,000.

Consider, too, that it not unusual to pay $120,000 to attend a private university for 4 years, and the earning difference drops to approximately $600,000. Once interest expenses are included in this figure, and accounting for the very real risk of penalties for late payments, the earning difference will be reduced even further. It should be reiterated again that these are all median data, which are a robust measure that is not affected by high-earning outliers.
It is plainly evident from these graphs that college graduates can expect to earn more with their degree, but the exact amount of this earning difference deserves to be scrutinized. The next step is to examine the upper and lower quartiles to see how the relationship looks. Student Loan Bubble predicts that the earnings gap for the 25th percentile will be somewhat lower than the median difference, and that the 75th percentile will show a much larger income difference.
It is the conclusion of Student Loan Bubble that the $1,000,000 lifetime earning difference truly is a myth that is not supported by the median income data. In the case that this myth has been used to justify excessive student debt liabilities, it is possible that some students will be seriously disappointed by their lifetime earning potential.
Supplement: A CSV file is available to download here, for anyone who wishes to give these data a closer look.
student-loan-bubble-lifetime-median-income.csv