Most people treat a summer job like a fire hose: money comes in fast for three months, then shuts off completely in September. That mismatch is exactly why so many students end up financing textbooks and groceries on a credit card by October. The fix isn’t complicated. It’s deciding, before your first paycheck lands, where every dollar is going — and then automating it so you never have to make a decision when you’re tired, hungry, or standing in a checkout line.

Start with the boring one: a buffer. Before you send a single extra dollar to your loan servicer, park enough cash to cover one semester’s predictable expenses — rent share, phone, transit, groceries, and whatever your financial aid doesn’t cover. For most students that’s somewhere between one and three thousand dollars. Call it the don’t-panic fund. This money exists so that when your car dies in November or your laptop screen cracks, you don’t reach for a 24 percent interest credit card. Paying down a 5 percent student loan while carrying a 24 percent card balance is a losing trade every single time.

Once that buffer is set, the interesting question shows up: should you throw the rest at your student loans or let it sit? The answer depends entirely on the interest rate, not on how guilty you feel.

Anything above 7 or 8 percent — most private loans, and older unsubsidized ones — deserves aggressive attention. Interest at that level compounds faster than almost anything else in your life, and there’s no federal program that will erase it. Pay those first, and pay them while you’re still in school if you can, because with unsubsidized federal loans, interest accrues from the day the money is disbursed and then capitalizes when your grace period ends. That means unpaid interest gets added to your principal, and you start paying interest on your interest. Knocking down even a few hundred dollars of that accruing interest before graduation saves you real money for years.

Federal loans under 6 percent are a different animal. Many qualify for income-driven repayment, and any remaining balance is forgiven after twenty or twenty-five years — sometimes sooner if you work in public service. If you’re on track for forgiveness, paying extra on a low-rate federal loan is often lighting money on fire. You’d be better off putting that cash in a high-yield savings account or a Roth IRA. Yes, a Roth IRA, if you have earned income from that summer job. You can contribute up to the amount you earned, and the money grows tax-free for decades. Retirement feels absurd when you’re twenty-two and broke, but a thousand dollars invested at that age can be worth roughly ten thousand at sixty-five. Student debt will follow you for a while. Compound interest will follow you forever.

Then there’s the part nobody wants to hear: not all of your summer money should go to debt. You are allowed to have a life. Set aside a fixed, guilt-free amount — three hundred dollars, five hundred, whatever your budget allows — for travel, concerts, takeout with friends, whatever makes the summer feel like a summer instead of an extended shift. People who budget with zero joy quit their budgets by August. A small, planned splurge is cheaper than a full burnout spending spiral in the fall.

Finally, automate the split the day you get your first paycheck. Open a separate savings account for the buffer fund and set an automatic transfer for a set percentage — twenty percent is a reasonable starting point, thirty if you’re living at home and not paying rent. Send another fixed amount to your highest-rate loan. Whatever’s left in checking is yours to spend without a spreadsheet or a guilt trip. When the money moves itself, you don’t have to be disciplined. You just have to not log in and undo it.

The summer goes fast. Sixteen weeks, maybe less. You’ll earn more than you think and remember less of it than you’d like. Decide now where it goes, and September-you will be a lot less stressed than last year’s version.