A 10% Credit Card Cap Cuts About a Third of $146B in Issuer Card Revenue — and It Lands in 2028, Not 2027

Credit card rates have become the rare affordability issue both parties can name without a cost. Bloomberg reported on Oct. 31 that Democratic and Republican midterm candidates are running on card rates in a field of razor-thin races, with average card rates now above 20% — nearly double a decade ago — and delinquency approaching its highest level since 2011. Politico's Oct. 23 read on the same race found $1.26 trillion of revolving card debt on household balance sheets at the end of June, and average rates on bank card accounts assessing interest above 22% in August. Turned credit card rates into the one affordability grievance both parties can campaign on.

Two details explain why this became an issue now rather than in 2024. The first is that the sponsor list is genuinely bipartisan: Representative Anna Paulina Luna joined the Senate bill's Democratic authors, and Texas candidate James Talarico and Florida's Angie Nixon have both made rate caps central to their campaigns. The second is that the path to passage now runs through a lame-duck Congress and a new one. Brookings noted on Oct. 22 that financial regulation could supersede presidential action in the new Congress — makes a statutory cap the only route with a multi-year runway.

A 10% ceiling against a book priced at 22.36% is arithmetic, not abstraction. The Federal Reserve's G.19 release of Oct. 7 put the average APR on card accounts assessing interest at 22.36% in August 2026, so a 10% cap removes 55% of the interest earned on every interest-accruing dollar of card debt. Apply that to the $146 billion of card revenue major issuers collected in 2025 and the arithmetic points to roughly $48 billion of annual revenue at risk — about a third of the industry pool — before a single dollar of credit loss or fee income is counted. That estimate assumes interest is about 60% of card revenue across the industry, a blend of the 25% at American Express and the 79% at Capital One, and it is ours, not a disclosure.

JPMorgan Chase is the counter-example that makes the rest of the sector legible. Card sits inside a $21.2 billion consumer banking segment inside $50.9 billion of quarterly managed revenue, half of which is non-interest — and payments, where fees are not capped, grew 14% to $5.6 billion. A rate cap cannot reach the half of the revenue that comes from markets, payments and fee businesses. The damage scales with card-lending intensity, not with the size of the card book.

Synchrony Financial is the cleanest expression of the trade. Its net interest margin was 15.5% in Q3 2026, down 12 basis points year over year, on interest and fees on loans of $5.6 billion. A 10% cap on the asset yield cannot support a 15.5% margin: the margin falls below 10% before a single basis point of funding cost changes, so net interest income of $4.81 billion in the quarter — $19.2 billion annualized — falls by at least a third, which is $6.8 billion against $4.7 billion of annualized pretax profit. What breaks first is not the earnings but the capital return: $3.84 billion of buybacks over the last four quarters against $511 million of dividends, funded by the spread a cap would remove.

American Express fails differently. Its revenue mix is the most defensive in the group — net revenue net of interest expense was $20.06 billion in Q3 2026, up 9%, with net card fees up 17% on a constant-currency basis and the fastest-growing line. But the profit bridge is the thinnest: $19.8 billion of annualized net interest income against $18.1 billion of annualized pretax profit. A cap on card rates would remove more than Amex's entire pretax profit before it touched a single fee. The company raised full-year GAAP EPS guidance to $18.30–$18.60 on Oct. 23; guidance of that shape cannot survive a 10% ceiling.

Bread Financial has no second engine at all. Net interest income of $1.10 billion sits against net revenue of $1.02 billion, and annualized net interest income is 5.2 times pretax profit of $836 million, on end-of-period loans of $18.1 billion that grew just 2% in the first quarter of 2026. There is no volume growth to offset a price cap, and no fee business to fall back on. A single-sector lender converts a price cap straight into a loss.

The industry's own model assumes issuers survive a cap by tightening credit standards, cutting rewards, raising fees and trimming marketing. CFRA Research published exactly that mitigation list in January. The bill specifically blocks the fee lever, the one instrument card pricing has relied on to stay above the headline rate. S.381 caps the total cost of credit inclusive of all finance charges and limits non-finance charges designed to work around the ceiling, while adding forfeiture of the entire interest for knowing violations and a private right of action within two years. That last provision changes behaviour on its own: it makes every pricing decision a litigation risk, which pushes issuers toward the cap rather than around it.

None of this would be survivable if funding costs were falling. They are not. The FOMC raised the target range for the federal funds rate by a quarter point to 3.75–4.00% on Sept. 16, 2026, in a unanimous 12–0 vote, stating that inflation remains elevated — the first increase in three years. A capped asset yield with a rising liability cost takes the spread from both ends. The squeeze is already visible in aggregate: US banks' net interest margin slipped to 3.22% in the first quarter of 2026 from 3.30% in the prior quarter.

The deposit-rich banks are not waiting for relief either. JPMorgan Chase grew net interest income 13% to $27.1 billion in Q3 2026, driven by higher deposit balances and card services volume, which is precisely the repricing that a cap would interrupt on the asset side. For the issuers funding card receivables with deposits and wholesale debt, the rate cycle turned against them at exactly the moment the political cycle turned against them.

The demand side is the part the industry's model keeps getting right. The Boston Fed's Current Policy Perspectives of Mar. 25, 2026, built on supervisory data covering nearly 80% of US card accounts between 2016 and 2025, found that a one-point rise in a card's APR cuts the borrower's spending by 8.7% the following month, and by about 15% for accounts that carry balances. A one-point APR increase also cuts the average revolving balance by roughly 4%. Reversed, a cap would pull spending forward and lift balances — but only for accounts that still have a line to borrow on.

Two of the upstream channels are already visible in reported numbers. TransUnion grew third-quarter revenue 12% to $1.31 billion, led by financial services, insurance and international rather than card origination, and Equifax reported $1.69 billion, up 10%. Visa reported fiscal fourth-quarter net revenue of $12.14 billion, up 13%, but payments volume growth decelerated to 9% from 10% in the prior quarter while US credit volume grew 11%. Network volume is the cleanest read on whether card credit is actually contracting, and it is the metric to watch before any issuer's reported interest income moves.