The 18% cap, in detail
The Federal Credit Union Act, implemented at 12 CFR 701.21(c)(7)(ii), caps the interest rate on most consumer loans made by federal credit unions at 15% annual percentage rate. The NCUA Board has authority to raise this ceiling for a limited period and has done so periodically, most recently to 18%, which has been the operative cap for many years. The NCUA reviews and re-extends the higher ceiling on a recurring basis.
The 18% cap applies to credit card APRs in addition to other consumer loans (auto loans, personal loans, signature loans). It is the absolute ceiling; no federal credit union can legally charge a higher APR on a credit card to its members, regardless of credit profile or trigger event.
For comparison, major US banks have no equivalent regulatory cap on credit card APRs. State usury laws apply, but most banks are chartered in states (most prominently South Dakota and Delaware) that have effectively unrestricted credit card interest rate ceilings. The published APR ranges on major bank cards routinely extend into the high 20s and occasionally above 30%.
Why the cap compresses everything downward, not just the ceiling
A casual reading of the 18% cap might suggest only borrowers at the high end benefit. The reality is that the cap compresses the entire APR distribution downward, including the floor. Credit unions price across a tighter range because the ceiling is fixed; they cannot extract higher rates from riskier borrowers to cross-subsidise lower rates for the prime borrowers.
On a major bank low APR card, the range might be 13.49% to 24.49%. The lowest offered APR is reserved for the strongest profiles; the rest of the distribution sits between the floor and ceiling. On a credit union card the range might be 11.49% to 17.49%. The floor is two points lower than the bank floor, even for the strongest profiles, because the smaller spread means the credit union does not need the same risk-adjusted return on prime borrowers.
Federal Reserve G.19 data on assessed-interest APRs across credit unions and commercial banks shows the gap consistently. Credit union accounts assessed interest carry APRs roughly 4 to 6 percentage points below commercial bank accounts, with the gap widening in high-rate environments (because the bank ceiling rises while the credit union ceiling does not).
The cooperative structure
Credit unions are member-owned cooperatives. Members are simultaneously the customers and the owners. Surplus earnings (the equivalent of profit at a bank) are returned to members as lower rates on loans, higher rates on savings, fewer fees, or capital reinvested in the credit union for the members’ collective benefit.
Major US banks are typically shareholder-owned for-profit corporations. Earnings flow to shareholders as dividends or share repurchases, with the remainder retained to grow the business and meet capital requirements. The return-on-equity expectations from public bank shareholders are real numbers that shape pricing decisions.
On a 22% APR credit card balance, the spread between the bank’s cost of funds and the rate charged is substantial. That spread funds losses on bad accounts, rewards programmes, marketing, operational costs, and a return on equity for shareholders. Credit unions have lower spreads to support because they do not need the equity return component. The math flows through to lower advertised rates.
Where banks still win
The major banks compete on different dimensions. Three categories where the bank ecosystem is hard to beat:
- 0% intro APR offers. The longest 0% intro windows (21 months on Wells Fargo Reflect, Citi Diamond Preferred, Citi Simplicity, U.S. Bank Visa Platinum) are bank products. Credit unions offer shorter intro periods (typically 6 to 12 months) because the cap on the post-intro rate compresses the economics of a long promotional period.
- Sign-up bonuses. Lucrative sign-up bonuses ($200, $500, even $1,000 cash equivalent for hitting a spending requirement) are bank card features. Credit unions occasionally offer modest bonuses but rarely compete at the same dollar amounts.
- Premium rewards categories. 5x travel, 4x dining, 3x groceries, airport lounge access, premium travel insurance, concierge services: these features are bank card territory, and the credit union equivalents are usually meaningfully less generous.
The honest framing: for someone who pays in full every month and never carries a balance, the bank ecosystem usually wins because the rewards extraction is higher and the APR is irrelevant. For someone who occasionally carries a balance or specifically values low APR pricing, the credit union ecosystem wins because the rate matters more than the marginal rewards uplift.
Joining a credit union
Two open-membership credit unions worth knowing for credit card purposes:
- PenFed (Pentagon Federal). Open to anyone via a $5 share savings account deposit. Strong cash back card with NCUA-capped APR. See our PenFed Power Cash Rewards review.
- Alliant Credit Union. Open via simple eligibility paths including the Foster Care to Success digital advocate option (Alliant covers the participation fee). Up to 2.5% cash back card with Tier One status. See our Alliant Cashback Visa review.
For military and eligible family, Navy Federal Credit Union is the largest credit union in the world and consistently has one of the lowest APR floors in the US market. See our Navy Federal Platinum review and Navy Federal cashRewards review. State-based credit unions like BECU (Washington), DCU (Massachusetts), and many others have geographic or employer-based eligibility worth checking against your situation.
Reader questions
Frequently asked questions
Why are credit union APRs lower than bank APRs?v
Two structural reasons. Federal credit unions are subject to an 18% APR cap on most consumer loans under NCUA rules (12 CFR 701.21(c)(7)(ii)), which holds the ceiling much lower than the high-20s rates major banks can publish. And credit unions are non-profit cooperatives owned by their members; they do not need to generate equity returns the way bank shareholders expect, which compresses the spread between cost of funds and the rate charged to borrowers.
Are credit unions actually accessible?v
Many are open-membership today. PenFed (Pentagon Federal) and Alliant are both open to anyone in the United States via simple qualification paths. Navy Federal is restricted to military and DoD-eligible families, but the family eligibility is broader than most people realise. State and community credit unions often have geographic or employer-based eligibility that covers more applicants than the marketing suggests.
Do credit unions report to the credit bureaus?v
Yes. Federal credit unions report to all three major bureaus (Equifax, Experian, TransUnion) for credit cards, loans, and other reportable accounts. Credit history with a credit union counts toward your FICO score the same as history with a major bank.
Are credit union rewards programs worse than bank rewards?v
On average, yes, but the gap is narrower than it used to be. Credit unions generally pay flat 1.5% to 2% cash back on their better cards, similar to bank flat-2% products. They do not typically offer the high category bonuses (5x travel, 4x dining) of premium bank cards, and they do not offer the lucrative sign-up bonuses common in the bank space. For category-chasing rewards optimisers the bank ecosystem is richer; for low APR and steady value the credit union ecosystem usually wins.
Is the credit union experience genuinely worse on app and customer service?v
Mixed. Major credit unions (Navy Federal, PenFed, Alliant) have apps and digital experiences that are competitive with the major banks. Smaller credit unions may have noticeably older technology, though most have invested heavily in the last five years. Customer service consistently rates higher for credit unions than for major banks in JD Power and Consumer Reports surveys, often by significant margins.