Guide
Compare student loan costs with fewer surprises
This guide explains how federal and private student loans are priced, what repayment plans change the timeline, and where refinancing can help or hurt.
Overview
Federal vs. private student loans: the trade you cannot undo
The most consequential decision in student-loan borrowing is whether the loan is federal or private. Federal loans (Direct Subsidized, Direct Unsubsidized, PLUS) come with standardized rates set by Congress, income-driven repayment plans, deferment and forbearance options, and (for some borrowers) Public Service Loan Forgiveness eligibility. Private loans, originated by banks and credit unions, are priced individually based on credit, can have lower rates for high-credit borrowers, but lack all of the federal protections. The authoritative source for federal loans is StudentAid.gov, run by the U.S. Department of Education.
This guide explains the major decision points before borrowing and the repayment options after.
Illustrative scenario for educational purposes. Real product pricing varies by lender, credit profile, and timing.
Federal first
Why federal loans are almost always the right starting point
Federal Direct Subsidized loans do not accrue interest while the borrower is enrolled at least half-time. Federal Direct Unsubsidized loans accrue interest but do not require payments during enrollment. Both qualify for income-driven repayment, which caps payments as a percentage of discretionary income after graduation. Those are large protections that no private lender matches. Exhaust federal eligibility (file the FAFSA) before considering private debt.
Capitalized interest
How unpaid interest becomes principal
Interest that accrues during deferment, forbearance, or grace periods is often capitalized — added to the principal — at the end of those periods. Future interest then accrues on the larger balance. The practical effect on a loan held many years can be material. Paying even small amounts of interest during enrollment, where possible, prevents this.
Repayment plans
Income-driven repayment in plain English
Income-driven repayment (IDR) plans cap monthly payments at a percentage of discretionary income and forgive remaining balances after 20–25 years (10 years for borrowers in qualifying public-service employment via PSLF). The newer SAVE plan replaced REPAYE; older plans (PAYE, IBR, ICR) remain available for some borrowers. The Department of Education’s IDR overview shows current plan rules and a loan simulator.
Private
When private loans make sense — and when they do not
Private loans can offer lower rates than federal Direct PLUS loans for high-credit parent borrowers, and can fill funding gaps after federal limits. Before signing, confirm: (1) the rate is fixed (variable rates have shown sharp moves historically), (2) the repayment options if you lose income, (3) whether a cosigner can be released and on what schedule, and (4) the full cost over the expected repayment period, not just the monthly payment.
Refinancing federal loans into private loans is rarely the right move for most borrowers — see our refinancing guide for that decision.
FAQ
Common questions
Should I use a private loan to avoid federal loan limits?
Only after running the math on Parent PLUS and other federal options. Federal protections (IDR, forbearance, PSLF) have significant real value that should be priced into the comparison.
Does loan forgiveness create a tax bill?
Historically yes for many IDR forgiveness paths, though recent federal legislation has temporarily excluded student-loan forgiveness from federal tax through specific dates. State tax treatment varies. Confirm current rules at StudentAid.gov and IRS.gov before relying on forgiveness as a plan.
What is the safest way to pay down student debt fast?
Stay on the standard or income-driven plan, make extra payments to the principal of the highest-rate loan first, and only refinance if you no longer need federal benefits and a meaningfully lower rate is available.
Sources & Methodology
Where we pulled the numbers
- Federal Student Aid · StudentAid.gov — Official U.S. Department of Education portal for federal student aid.
- CFPB · Student loans — CFPB consumer resources on federal vs. private loans, servicing, and repayment.
- Federal Student Aid · Income-driven repayment — Plain-English explainer on IDR plans including SAVE, PAYE, IBR.
This guide was created with AI-assisted drafting and human editorial review by Javi Pérez. Figures, examples, and explanations are checked against public sources including CFPB, the Federal Reserve, FDIC, BLS, FTC, and SEC where applicable. Content is reviewed quarterly. Javi Pérez is not a licensed financial advisor, CPA, CFP, loan officer, tax professional, or attorney. This content is educational only and does not replace advice from a qualified professional.
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