Who Bears Mortgage Credit Risk? G-Fees and LLPAs Explained

On a conforming U.S. mortgage, the bank that made the loan usually does not bear the credit risk for long. It typically holds the loan for a few weeks at most and then sells it into the secondary market, and the credit risk goes with it. The bulk of that risk lands on Fannie Mae and Freddie Mac, the government-sponsored enterprises (GSEs). They price it explicitly through two tools: the guarantee fee (g-fee) and loan-level price adjustments (LLPAs).

Where the risk ends up matters. Whose balance sheet holds it, who sets its price and what federal backing stands behind it shape all the mortgage credit risk modeling that follows.

The six links in the credit risk chain

A conforming mortgage passes through a chain of risk-bearers over its life:

1. The originator, meaning the bank, credit union or non-bank lender that underwrites and closes the loan.
2. The GSE, Fannie Mae or Freddie Mac, which buys the loan and absorbs the credit risk in exchange for a guarantee fee.
3. The agency MBS investor, who buys the mortgage-backed security the GSE issues against a pool of loans but is shielded from credit risk by the GSE's guarantee.
4. Private mortgage insurance (PMI), which provides first-loss coverage on high-LTV loans before the GSE's exposure begins.
5. The taxpayer, because both GSEs are under federal conservatorship and catastrophic GSE losses ultimately flow to the federal balance sheet.
6. The borrower, who bears the residual consequences of default.

The key structural fact is that the GSE in the middle of the chain absorbs most of the credit risk and charges for it openly. That is why the GSE's pricing tools are the central pricing artifact of U.S. mortgage credit risk.

Originators: a short window of risk

The originator markets the loan, takes the application, underwrites it and funds it at closing. In a typical conforming workflow, it holds the loan for days to weeks between funding and sale. During that window it bears credit risk and pays warehouse financing costs on the funded amount.

The window is short on purpose. Origination is a volume business, and capital tied up in funded loans cannot fund the next one. Selling the loan frees that capital and locks in the originator's revenue, which comes from origination fees and from the gain or loss on the sale.

There are two important exceptions:

• Community banks and portfolio lenders may keep conforming loans on their balance sheets. They absorb the credit risk in exchange for longer-term interest income and manage it through their own underwriting and concentration limits.
• Jumbo lenders make loans above the conforming loan limits, and the GSEs only buy conforming loans. These loans go to private label aggregators or stay on balance sheets.

In both cases the originator keeps the credit risk indefinitely.

The GSE, the investor and the insurer

Fannie Mae and Freddie Mac buy conforming loans, pool them into mortgage-backed securities and guarantee principal and interest to the investors. If a borrower defaults, the investor still gets paid. The GSE makes up the difference and absorbs the loss. That guarantee is what the "agency" label on agency MBS means.

Both GSEs have been in federal conservatorship since September 2008, when the Federal Housing Finance Agency (FHFA) took them over at the depth of the housing crisis. In practice, credit risk borne by the GSEs is borne by the federal balance sheet.

The agency MBS investor is shielded from default losses but still faces the loan's other risks:

• Interest rate risk, because the security pays a fixed coupon and its price moves inversely with rates.
• Prepayment risk, because borrowers can refinance or sell at any time. Prepayments shorten the security's effective duration, known as contraction risk, and reduce future yield.

Prepayment risk is the main analytical concern for agency MBS investors. For credit risk modeling, the takeaway is simpler: credit risk lives at the GSE, not at the investor.

For loans with an original loan-to-value ratio above 80%, the GSE requires a credit enhancement, almost always private mortgage insurance. Those loans carry materially higher expected losses because the borrower has less equity at risk and the lender has less margin to recover in foreclosure. When a high-LTV loan defaults, the PMI policy absorbs the first dollars of loss up to its contractual coverage amount. Only then does the GSE start absorbing losses. The borrower pays monthly premiums for this coverage, and the GSE's exposure becomes the second-loss layer.

Taxpayers and borrowers at the ends of the chain

In normal years, the fees the GSEs collect more than cover their credit losses. Those earnings historically went to Treasury under the conservatorship's net worth sweep agreement; since amendments in 2019 and 2021, the GSEs retain them to build capital. In those years the taxpayer link is theoretical. In stress years, such as a housing crisis, a severe regional price decline or a sharp recession, fees may not cover realized losses, and federal backing becomes the tail risk absorber.

That tail risk is why the FHFA, as conservator and primary supervisor, takes an active role in g-fee and LLPA pricing. Pricing has to be high enough to cover expected losses and build capital. It cannot be so high that it suppresses mortgage credit availability or pushes origination toward riskier non-agency channels.

The borrower sits at the end of the chain. In a default that ends in foreclosure, the borrower can lose their equity, face a deficiency judgment where state law permits one, suffer long-term credit score damage and be displaced from the home. These consequences are real, but they are not credit risk in the modeling sense. In modeling, credit risk means the lender's exposure to non-repayment and the loss it produces. In the conforming market, that is the GSE's exposure.

How the GSE prices risk: the guarantee fee

The g-fee is what the GSE charges for taking credit risk off the originator's balance sheet. The originator or servicer pays it, and it is expressed in basis points per year on the loan's outstanding principal balance.

The FHFA publishes an annual report on Fannie Mae and Freddie Mac guarantee fees. The 2024 report put the average single-family g-fee at 65 basis points. 30-year products averaged 66 basis points and 15-year products averaged 47.

The 15-year fee is nearly 20 basis points lower for three reasons:

• Faster amortization. The balance falls and the LTV improves more quickly, so exposure shrinks faster.
• Borrower self-selection. The higher monthly payment attracts borrowers with more income headroom and typically higher credit quality.
• A shorter exposure window. Even with identical annual default rates, cumulative default exposure over the loan's life is smaller.

The g-fee varies by product but not mainly by individual borrower attributes. That job falls to the LLPA.

How the GSE prices risk: loan-level price adjustments

The LLPA is a one-time upfront adjustment, expressed in points on the loan amount, that the originator pays when it sells the loan to the GSE. Fannie Mae and Freddie Mac each publish their own LLPA matrix, and the FHFA coordinates the two so they stay closely aligned. Matrix dimensions include:

• Credit score
• Loan-to-value ratio at origination
• Loan purpose: purchase, rate and term refinance, or cash-out refinance
• Occupancy: owner-occupied, second home or investment property
• Number of units: one unit or two to four units

The originator usually passes the cost to the borrower through a higher rate or higher closing costs. So riskier borrowers pay more.

Here is an illustration with two owner-occupied single-family purchase loans of $400,000. Loan A has a 780 credit score and 65 LTV and might pay somewhere between zero and a quarter point, a negligible cost. Loan B has a 680 credit score and 90 LTV and pays a materially larger adjustment, on the order of a point or more, which is $4,000 or more on this loan. Check the current GSE matrices for exact values. The principle behind them holds: loans whose attributes predict higher default and loss pay more for the guarantee.

Mapping real data onto this grid is informative. A sample of 1,048 California loans from the 2019 Q1 cohort, bucketed by credit score and original LTV, clusters heavily in the good-credit, moderate-LTV cells and is sparse in the high-risk corner.

The LLPA matrix is a live policy instrument. On May 1, 2023, the FHFA implemented a redesigned matrix. The best-pricing credit score threshold moved from 740 to 780, and the credit score and LTV buckets were restructured. Some combinations saw increases and others saw decreases. The FHFA described the change as supporting the Enterprises' safety and soundness and capital building while serving their mission.

The specific values change over time. The mechanism of upfront price adjustment by borrower attributes stays the same.

Key takeaways

• Conforming loan originators typically hold credit risk only for a brief warehouse period before selling the loan.
• Fannie Mae and Freddie Mac absorb the bulk of conforming credit risk, and because of conservatorship, that risk effectively sits on the federal balance sheet.
• Agency MBS investors face interest rate and prepayment risk but are shielded from credit losses.
• PMI takes the first loss on loans above 80% original LTV, which leaves the GSE in the second-loss position.
• G-fees are annual charges in basis points that vary by product, and 15-year loans pay less than 30-year loans.
• LLPAs are upfront charges that vary by borrower and loan attributes. The FHFA redesigned the matrix in May 2023, raising the best-pricing threshold from 740 to 780.