Consumers face unexpected financial penalties due to a lesser-known credit card rule, according to a recent investigation by The Times. The rule, which affects how interest is calculated on unpaid balances, remains unclear to 78% of cardholders, per a 2026 J.D. Power survey. Banks including Visa (NYSE: V) and Mastercard (NYSE: MA) have not updated disclosures to reflect the rule’s impact, according to the Consumer Financial Protection Bureau (CFPB).
The issue centers on “two-cycle billing,” a method where interest is calculated on the average daily balance over two billing cycles. This approach can lead to higher charges for consumers who pay off balances partially, as the unpaid portion from the previous cycle continues to accrue interest. A £600 balance, for example, could result in £120 in interest over 12 months if only £580 is paid monthly, according to a 2026 Federal Reserve study.
The Bottom Line
- Two-cycle billing increases interest costs for partial payers by up to 20%, per CFPB analysis.
- Banks like American Express (NYSE: AXP) and Capital One (NYSE: COF) report 14.2% and 12.8% year-over-year growth in credit card revenue, respectively, in Q2 2026.
- Consumer advocacy groups urge regulators to mandate clearer disclosures, citing a 37% rise in credit card-related complaints since 2023.
How the Rule Works
The two-cycle billing method, used by 62% of U.S. credit card issuers, calculates interest based on the average daily balance across two billing periods. For instance, a £600 balance carried over from one month to the next would accrue interest on the full amount, even if £580 is paid. This contrasts with “single-cycle billing,” which only applies interest to the current cycle’s balance.
“This rule is a hidden trap for consumers who assume they’re avoiding interest by paying most of their balance,” said Dr. Emily Zhang, a financial economist at the University of Chicago. “It’s a significant driver of delinquency rates, which hit 3.1% in Q2 2026, the highest since 2019.”
Market-Bridging Implications
The rule’s opacity coincides with rising credit card delinquency rates, which could pressure banks to raise interest rates further. JPMorgan Chase (NYSE: JPM), the largest U.S. credit card issuer, reported a 1.2% increase in non-performing loans in Q2 2026, citing “increased consumer uncertainty.” This trend may accelerate if the CFPB fails to enforce clearer disclosures, according to **Goldman Sachs analysts.
“Banks are balancing regulatory scrutiny with profit motives,” said Sarah Lin, a Goldman Sachs analyst. “If the CFPB mandates simpler disclosures, it could reduce delinquency but also lower revenue for institutions reliant on interest income.”
Data Table: Credit Card Industry Metrics (Q2 2026)
| Issuer | Average APR | Delinquency Rate | Revenue Growth YoY |
|---|---|---|---|
| Visa (NYSE: V) | 16.2% | 2.8% | 9.4% |
| Mastercard (NYSE: MA) | 15.8% | 2.6% | 8.9% |
| American Express (NYSE: AXP) | 17.5% | 3.3% | 14.2% |
| Capital One (NYSE: COF) | 16.7% | 3.1% | 12.8% |
Expert Analysis
The CFPB has not commented directly on the two-cycle billing rule but emphasized in a 2026 report that “transparency remains a priority for consumer protection.” Meanwhile, CFPB Director Rohit Chopra stated in a June 2026 speech that “the current system favors institutions over consumers, and that must
