As the federal banking agencies finalize the Basel III endgame capital rules, Tim Mattke, the chief executive of mortgage insurer MGIC and chair of the industry group U.S. Mortgage Insurers, made a specific request in an American Banker opinion piece this week. When banks calculate capital for low-down-payment mortgages held in portfolio or securitized privately, he argues, they should receive credit for private mortgage insurance as the risk mitigant it demonstrably is. The current treatment, he says, is asymmetric with what Fannie Mae and Freddie Mac already receive under the GSE capital framework.
The argument deserves a fair hearing, and it gets one here. It also deserves the question its author does not ask: who gains, directly and immediately, if the agencies agree.
The argument on the merits
Mattke's factual core is strong. Low-down-payment mortgages, meaning loans with less than 20 percent down, make up roughly 40 percent of first-lien single-family purchase originations each year, yet banks hold a small share of that high-LTV segment in portfolio, in part because the capital treatment offers no reward for buying insurance. Private mortgage insurers have paid more than $62 billion in claims since the financial crisis. In 2025 alone, private MI helped more than 800,000 borrowers qualify for roughly $311 billion in mortgages, some with down payments as low as 3 percent.
The loss-mitigation record is independently verifiable. The Urban Institute's analysis of GSE loan data covering originations from 1994 through 2024 finds that total loss severity on loans without private MI was 48.0 percent, against 31.2 percent for insured loans. In the worst origination years, 2005 through 2008, severity ran 58.6 percent without MI versus 41.5 percent with it. The insurance does not prevent the downturn. It absorbs a large and measurable share of the losses when one arrives. Mattke cites a Milliman analysis of more than 90 million GSE loans reaching the same conclusion, and calls MI "the only scalable form of credit enhancement" available to lenders from the smallest community bank to the largest global institution. On the risk-mitigation question, the evidence is largely on his side.
Who stands to gain directly
Now the disclosure, which the piece itself makes by way of its byline: Mattke is the CEO of MGIC and chairs U.S. Mortgage Insurers. A capital credit for MI would expand the volume of insured high-LTV lending outside the GSE channel, which is to say it would expand the demand for the product MGIC sells. That is not a disqualification. Industry executives write regulatory commentary every day, and their knowledge of their own market is part of the record. But a reasonable reader should know that the author's company is the most direct beneficiary of the change he proposes, and that the "one critical modification" he describes as advancing homeownership would also, and first, advance mortgage insurance volume.
The breadth of support for the position is worth recording honestly, because it cuts the other way. The industry's comment letter on the original Basel proposal was joined by civil rights organizations including the NAACP, the National Urban League, and UnidosUS, groups with no stake in MGIC's revenue, on the theory that capital treatment that ignores MI raises the cost of the exact loans first-time and minority buyers rely on. The coalition behind the credit is not only insurers. It includes people whose job is access.
The counterweights the op-ed does not carry
The argument against the credit is not weak either, and it deserves its strongest form. The agencies' 2023 proposal did not forget to credit MI. It proposed raising the risk weight on a 90 percent-plus LTV bank-held mortgage with private MI from 50 percent to 70 percent, eliminating the existing recognition. The change was deliberate. A bank that holds a mortgage retains its tail risk even with insurance attached, because the insurance is itself a claim on a private counterparty whose solvency moves with the same housing market. In 2008, the enhancer and the asset weakened together, and the industry survived by raising enormous amounts of capital afterward. The GSE comparison is imperfect for the same reason: Fannie and Freddie sit behind a government backstop, and crediting MI in their framework means the taxpayers' exposure, not the bank's, is the base the insurance protects.
There is also the consumer side of the same coin. Cheaper capital on high-LTV loans expands credit to the most stretched borrowers, which is the access argument in reverse. More such lending means more households with thin equity enter downturns, and those households are where harm concentrates when prices fall. That is not an argument against the credit. It is the reason regulators treat this segment conservatively in the first place, and any final rule has to weigh both halves at once.
The rule has already moved once
It helps to know where this debate has been. The agencies' 2023 proposal assigned mortgage risk weights from 40 to 90 percent, rising as high as 140 percent for loans sold to the government-sponsored enterprises, with operational risk charges adding roughly five points on top. The comment record was extraordinary: a Latham & Watkins analysis of 356 letters found more than 97 percent opposed the rule or expressed concerns, and 86 percent of the negative comments came from outside the banking industry, including 225 members of Congress, civil rights organizations, pension funds, and state officials. Federal Reserve Chair Jerome Powell conceded the point to Congress, saying the agencies expected broad and material changes. The revised proposal that followed, in March 2026, drew praise from banking trade groups as a significant improvement, and the final rule is still being written. Whether the MI credit survives into it is an open question, and Mattke's piece is best read as a late-stage filing in that negotiation.
The industry's post-crisis record is part of that filing and deserves its due. Under the capital and quality control standards the industry now runs under, known as PMIERs and overseen through the federal housing finance framework, mortgage insurers held roughly $11.4 billion in excess capital at the end of 2023, about 72 percent above requirements, after raising some $19.5 billion in capital since 2008. A streamlined master policy adopted in 2013 tightened coverage terms. Premium yields have fallen from 52.5 basis points to 39.4 since 2017, and mortgage insurance-linked notes, which pass MI risk to bond markets, grew from $299 million in 2015 to $6.3 billion in 2021. The enhancer that failed alongside everything else in 2008 is not the same institution today. That is the strongest line in the industry's argument, and it is true.
What recognition would actually do
The practical consequences of granting the credit are specific. Bank capital treatment would align with the GSE framework and with the loss accounting banks already use under the CECL standard, which recognizes the insurance's effect on expected losses. Portfolio high-LTV lending would price more competitively against the GSE channel. Banks would hold more such loans, with private capital absorbing first losses instead of the taxpayer, which is, on the merits, the strongest structural argument for the change: it moves risk-bearing from the government backstop toward private capital without sacrificing access.
The scale of the shift should not be overstated in either direction. The bank portfolio share of high-LTV lending is small today, which means the credit would move a modest volume of loans in its first years, not reorder the mortgage market overnight. But capital rules work on the margin, and the margin is where a bank decides whether a 95 percent loan-to-value mortgage with insurance is a business it wants to be in. Change the price of that decision and the composition of bank balance sheets follows over a decade. That is precisely why the insurers want the credit and why the agencies have been slow to give it.
The residual question is the one the op-ed leaves open. Credit the insurance for the losses it absorbs, certainly. But the capital system must also price the possibility that the insurer itself cannot pay, at the moment everyone needs it to pay, in the downturn where every claim arrives at once. The industry's rebuilt capital standards under the post-crisis PMIERs regime are genuine progress, and the Urban Institute data show the insurance works. Whether the final rule should treat the insurer's tail risk as negligible is a judgment for regulators, not a question the industry's data can settle on its own.
Decide as if the author stood to gain nothing
The test for the agencies is straightforward, and it is the one this piece has applied. If the author stood to gain nothing, would the evidence still support the change? On the risk-mitigation core, mostly yes: the loss severity data are real, the GSE asymmetry is real, and the alignment with CECL is real. The parts that remain open, the counterparty concentration and the consumer-side tradeoff, are precisely the parts the op-ed spends the least time on.
None of that means the credit should be denied. It means the decision should be made by people with no revenue attached to it, on the evidence, in full view of who asked. That is what the comment record is for, and it is a good thing the agencies have one.
Primary sources
- Tim Mattke's opinion piece in American Banker for the request for MI credit, the origination and claims figures, the Milliman citation, and the 2025 borrower data.
- The Urban Institute's Mortgage Insurance Data at a Glance 2025 for the independent loss severity figures on GSE loans.
- U.S. Mortgage Insurers' comment letter announcement, the ABA Banking Journal analysis, and National Mortgage News coverage for the Basel proposal's treatment of mortgage risk weights, the comment letter record, and the industry coalition including civil rights groups.