Why your first paycheck is smaller than expected
Gross is what you earned. Net is what lands after federal income tax, FICA (7.65 percent combined), state tax (where applicable), local tax, and any voluntary deductions. For a student earning $15 per hour at 20 hours per week, federal withholding can be small (or zero with the right W-4) but FICA is always there.
The W-4
This tells your employer how much federal tax to withhold. As a student earning under the standard deduction, you may qualify to claim "exempt" on the W-4. Only if you owed zero federal tax last year and expect zero this year. Read the W-4 instructions.
Are scholarships taxed?
Scholarships used for qualified tuition and required fees are tax-free. Scholarships for room, board, or non-required expenses are taxable. This sits separate from your paycheck.
Will I get a refund?
If your annual income is below the standard deduction and federal tax was withheld, yes. FICA withholding is generally not refunded.
Do I have to file?
Depends on total income. Even if not required, file to claim withheld federal tax. Use IRS Free File if income is low.