COMPARISON · MONEY · BANKING
A $30,000 auto loan at 5.75% (credit union) versus 7.49% (bank) — NCUA national averages for 60-month new-auto loans. The credit union charges $576.50 a month against the bank's $601.00, saving $1,469.57 in interest. Add a $12/month bank checking fee ($720 over 5 years) and savings growth at 1.00% vs 0.38% APY on $10,000 ($318.65), and the credit union wins by $2,508.22. Run your own rates, fees, and balances below.
Three legs scored in dollars: the auto-loan leg (total interest at each APR), the fee leg (monthly account fees over the horizon), and the savings leg (APY on the same balance). The verdict is the sum of all three.
Credit-union advantage = (bank loan interest − CU loan interest) + (bank fees − CU fees) + (CU savings growth − bank savings growth). At the defaults — a $30,000, 60-month auto loan at 5.75% vs 7.49%, $12 vs $0 monthly fees, and $10,000 compounding at 1.00% vs 0.38% APY for 5 years — that is $1,469.57 + $720.00 + $318.65 = $2,508.22 for the credit union. Three legs, one verdict, no hand-waving.
Setup: $30,000 loan, 60 months, credit union APR 5.75% vs bank APR 7.49% (NCUA Q2 2025 national averages); bank checking fee $12/mo vs $0 at the credit union over 5 years; $10,000 savings at 1.00% vs 0.38% APY (FDIC national average, October 2026) for 5 years.
The loan leg. Credit union: $30,000 at 5.75% for 60 months → $576.50 a month, $34,590.18 total, $4,590.18 interest. Bank: $30,000 at 7.49% for 60 months → $601.00 a month, $36,059.75 total, $6,059.75 interest. The credit union saves $1,469.57 in interest. Same pattern on used loans: 48 months at 5.82% vs 7.79% on $20,000 costs $2,466.49 vs $3,341.89 in interest.
The fee leg. Bank: $12 × 12 × 5 = $720.00. Credit union: $0 × 12 × 5 = $0.00. The credit union saves $720.00 — fees are a third of the total advantage here.
The savings leg. Credit union: $10,000 × 1.015 = $10,510.10. Bank: $10,000 × 1.00385 = $10,191.45. The credit union earns $318.65 more.
The verdict: $1,469.57 + $720.00 + $318.65 = $2,508.22 — the credit union wins. The loan leg does most of the work (59% of the advantage), fees contribute 29%, savings 13%.
Branch — 1.9% manufacturer promo APR: the bank's loan interest drops to $1,471.29, so the loan leg flips to −$3,118.90 for the bank. Even keeping the other two legs, the bank now wins by $2,080.25. Manufacturer-subsidized rates are the one case where a bank (or the captive lender) beats a credit union cold.
Branch — 4.35% online-bank HYSA as the “bank”: $10,000 at 4.35% for 5 years grows to $12,372.64, flipping the savings leg to −$1,862.54 for the bank. But the credit union still wins the total by $327.04 on the strength of the loan and fee legs. This is why the honest comparison puts savings at an online bank and the loan at a credit union.
Branch — $0-fee bank checking: the fee leg ties at $0.00, and the credit union still wins by $1,788.22 — $1,469.57 on the loan plus $318.65 on savings. Killing the fee narrows the gap by $720 but doesn't erase it.
| Output | Formula | What it means |
|---|---|---|
| Loan leg | bank interest − CU interest, P·r(1+r)n / ((1+r)n − 1) per side | $1,469.57 at the defaults — how much cheaper the CU loan is in total interest. |
| Fee leg | (bank monthly fee − CU monthly fee) × 12 × years | $720.00 at the defaults — the account-keeping price gap, often the quietest win. |
| Savings leg | balance × (1 + CU APY)years − balance × (1 + bank APY)years | $318.65 at the defaults — the compounding edge on the same $10,000. |
| Credit-union advantage | loan leg + fee leg + savings leg | $2,508.22 → the credit union wins. Negative means the bank wins. |
The APR figures are labeled 2026 estimates built on NCUA Q2 2025 national averages (60-month new-auto: 5.75% credit union / 7.49% bank; 48-month used: 5.82% / 7.79%), reported via FinancePly in September 2026 — your quote depends on credit score, term, and the vehicle. The 0.38% bank APY is the FDIC national average cited by the Wall Street Journal on October 22, 2026; the 1.00% credit-union APY is adjustable and labeled as such — credit union rates vary widely. What this skips: membership eligibility (many credit unions are open to anyone, some are not), branch and ATM convenience, digital-app quality, business banking, and introductory or waivable fees (enter your real fee). The math is exact amortization and compounding; the inputs are what make or break the verdict.
Data sources for the defaults: NCUA Q2 2025 national-average auto loan rates (via FinancePly, September 2026) and the FDIC national-average savings rate (via the Wall Street Journal, October 22, 2026).
Bright Side Kit. "Credit Union vs Bank." https://brightoolbox.com/credit-union-vs-bank/ Accessed October 23, 2026.Yes, up to the same limit. Federal credit unions are insured by the NCUA for up to $250,000 per depositor per institution — the exact same coverage a bank's FDIC insurance provides. Make sure the credit union is federally insured (nearly all are).
You need a membership link — historically an employer, community, or association. But many large credit unions are open nationwide: Navy Federal (military community), PenFed, and Alliant accept broad eligibility, and many community credit unions take anyone in their region. Joining usually costs a $5 share deposit.
No — the default 5.75% vs 7.49% gap is real, saving $1,469.57 in interest on $30,000, but manufacturer promo rates (like 1.9%) beat credit unions cold: the bank wins by $2,080.25 in that branch. Enter the actual APR you're offered — that's the only comparison that matters.
Often, yes. A 4.35% online-bank HYSA grows $10,000 to $12,372.64 in five years vs $10,510.10 at the 1.00% credit union rate — the savings leg flips to the bank by $1,862.54. The credit union still wins the total by $327.04 at the defaults, but the honest play is often a credit union loan plus an online savings account.
Monthly maintenance fees average $12 at large banks in 2026, usually waivable with a minimum balance or direct deposit. Over five years that's $720 — nearly a third of the credit union's total advantage at the defaults. If your bank waives it, enter $0 and the fee leg ties.
Yes — it's the best strategy the calculator reveals. Take the credit union auto loan at 5.75% ($1,469.57 cheaper), park savings at an online bank paying 4.35%, and keep a $0-fee checking wherever you like it. Loyalty to one institution costs you; pricing each job separately doesn't.
They are NCUA Q2 2025 national averages for 60-month new-auto loans, reported via FinancePly in September 2026. National averages smooth over credit scores — a top score gets better, a thin file worse. Enter the APRs you were actually quoted for the verdict that applies to you.