The most widely cited rule of thumb in college debt planning is straightforward: your total student loan debt at graduation should not exceed your expected first-year salary. Financial planners at Fastweb, Earnest, JG Wentworth, and College Finance all point to this benchmark for roughly the same reason — if debt is at or below one year's starting salary, a 10-year standard repayment plan is typically manageable without consuming an unsustainable share of monthly income.

The practical implication is that the right debt limit is not a single number — it's specific to your major. A nursing graduate expecting $65,000 starting salary can carry more debt than a social work graduate expecting $40,000. That's not a value judgment about which field matters more. It's arithmetic about which income can support which monthly payment without creating decade-long financial stress.

When total planned borrowing — including any Parent PLUS or private loans — divided by the expected starting salary in your chosen field exceeds 1.0, that's the first clear warning sign. When it exceeds 1.5, it's a serious red flag that deserves a hard look at alternatives.

A second way to check affordability is to convert the planned debt into an estimated monthly payment and compare it to what take-home pay will realistically look like in the first year after graduation. Financial advisors typically recommend keeping student loan payments at or below 8% to 10% of gross monthly income. The JG Wentworth debt guidance framework adds a related constraint: total debt payments — loans, rent, car payment, and any other obligations — should stay below 36% of gross income.

For a graduate earning $50,000 a year, gross monthly income is about $4,167. Eight to ten percent of that is $333 to $417 per month in student loan payments. At a 6.52% interest rate on a 10-year standard plan, a $37,000 loan balance produces a monthly payment of roughly $420. That's right at the edge of the 10% threshold — manageable, but tight. A $60,000 balance at the same terms produces roughly $682 a month. For a $50,000 salary, that's about 16% of gross monthly income — a level that leaves very little room for rent, transportation, food, and anything resembling savings.

Some warning signs come from the financial aid package itself, rather than from the total cost number. College Finance and the Princeton Review both highlight common practices that make packages look more generous than they are.

The most common one is including loans in the aid package without clearly distinguishing them from grants and scholarships. A package that shows "$28,000 in financial aid" might include $15,000 in loans. Those loans are not aid — they're debt that will need to be repaid with interest. The actual aid (free money that reduces cost) is only the grant and scholarship portion.

A second red flag is scholarship or grant awards that don't renew automatically. Some institutional merit scholarships require maintaining a specific GPA or credit load. If that condition isn't met, the scholarship disappears in year two or three, and the net price suddenly rises. College Finance advises verifying renewal criteria for every named scholarship in the package — and treating any award without clear renewal conditions as potentially one-year-only when planning four-year costs.

A school's graduation rate doesn't just reflect how good the school is — it also tells you something about financial risk. Students who don't graduate incur costs and debt without the degree credential that justifies them. If a school's four-year graduation rate is below 50%, the realistic probability that a randomly enrolled student walks away with a degree in four years is lower than the marketing materials suggest.

Low graduation rates in specific programs compound this risk. A student might be comparing the overall university graduation rate of 70% without knowing that the specific program they're entering graduates only 40% of students who start it. The College Scorecard provides program-level completion data that is considerably more informative than institution-level rates for this purpose.

A school that costs more and has a lower completion rate than a comparable alternative is usually the wrong financial choice. The combination of higher cost and higher dropout risk compounds the financial exposure in both directions simultaneously.

A college is too expensive when the total planned borrowing exceeds what the target major's starting salary can support, when the monthly payment would consume an unsustainable share of take-home pay, when the financial aid package hides loans as aid, or when the school's completion rate doesn't justify the cost difference over lower-priced alternatives. Any one of these warning signs is worth taking seriously. Two or more together is a signal that this particular college, at this particular price, deserves a much harder look before the decision is made.