Milliman Mortgage Default Index: 2020 Q4

Milliman Mortgage Default Index: 2020 This fall

The Milliman Mortgage Default Index (MMDI) is a lifetime default charge estimate calculated on the loan stage for a portfolio of single-family mortgages. For the needs of this index, default is outlined as a loan that turns into 180 days or extra delinquent.1 The outcomes of the MMDI replicate the newest information acquisition out there from Freddie Mac, Fannie Mae, and Ginnie Mae, with measurement dates ranging from January 1, 2014.

COVID-19 results on mortgage danger

Important uncertainty continues concerning how mortgage efficiency could also be affected by the COVID-19 pandemic and its related financial impacts. Whereas unemployment charges, delinquency charges, and the proportion of loans in forbearance have elevated quickly because the begin of the pandemic (and stay at elevated ranges), the housing market has remained resilient. Please consult with prior releases of the MMDI,2 in addition to latest Milliman articles on the subject,3 for extra detailed discussions of the potential influence of the pandemic on mortgage efficiency.

The present distinctive mixture of a sudden shift to distant work and traditionally low rates of interest has partially contributed to a surge in buy and refinance originations. This, coinciding with tight housing provide, has resulted in above-average residence worth appreciation. As residence fairness is the biggest driver of mortgage defaults, these developments contribute to decrease default charges.

Key findings

Through the fourth quarter (This fall) of 2020, mortgage demand continued to rise, with Freddie Mac and Fannie Mae mortgage quantity growing greater than 132% year-over-year, hitting file quantity within the quarter. Default danger of mortgages remained in step with the prior quarter.

When reviewing the whole default danger quarter-over-quarter, notably elements associated to the borrower danger (i.e., the credit score profile of debtors) and underwriting danger (i.e., particular loan and property options that enhance or lower default danger), the MMDI for government-sponsored enterprise (GSE) acquisitions—loans acquired by Freddie Mac and Fannie Mae—was usually constant, at 1.27% for loans originated in 2020 This fall in comparison with 1.28% for loans originated in 2020 Q3. Determine 1 gives the quarter-end index outcomes for these loans segmented by buy and refinance.





The MMDI for Ginnie Mae loans elevated from 7.39% in 2020 Q3 to 7.64% in 2020 This fall, as could be seen in Determine 2 (segmented by buy and refinance). For sure kinds of refinance loans (i.e., streamlined refinance loans), Ginnie Mae acquisitions don’t obtain an up to date credit score rating. For the MMDI, a credit score rating of 600 is conservatively used to calculate the default danger on mortgages with a lacking credit score rating. As a result of a big portion of quantity was refinance quantity, many Ginnie Mae loans are getting assigned a low credit score rating of 600.



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When reviewing quarter-over-quarter modifications within the MMDI, you will need to be aware that the 2020 Q3 MMDI values for GSE and Ginnie Mae acquisitions have been restated because the final publication, altering from 1.50% to 1.28% and eight.69% to 7.39%, respectively. This can be a results of updating precise residence worth actions from forecasted values and updating residence worth appreciation forecasts with the newest forecasts out there. Because the begin of the pandemic-induced shutdowns (March 2020), precise residence worth appreciation has exceeded expectations, leading to consecutively decrease restated values of the MMDI.

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Company abstract

When evaluating the newest Freddie and Fannie acquisitions to the prior quarter, default danger was usually in step with 2020 Q3 originations. For 2020 This fall, 71% of the mortgage quantity was attributable to refinance loans, in comparison with 68% in 2020 Q3.

Loans assured by Ginnie Mae skilled a slight enhance of their default danger in 2020 This fall relative to the prior quarter. Of the Ginnie Mae loans originated throughout this quarter, roughly 56% have been refinance loans.

One space of probably elevated ranges of danger within the mortgage market has been a rise is cash-out refinance mortgages over the previous 12 months.



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In keeping with Freddie Mac, ”a cash-out refinance Mortgage is a Mortgage through which the usage of the loan quantity is just not restricted to particular functions.”4 In different phrases, a refinance mortgage the place the borrower takes fairness out of the property. Main as much as the worldwide monetary disaster of 2007-2010, cash-out refinance mortgage loans have been a big driver of danger as many debtors extracted fairness from rising residence costs.

Throughout this time, debtors have been in a position to faucet their fairness for as much as almost all the worth of the house, adjusting their present loan-to-value (LTV) ratios from pre-refinance ranges as much as 100%. After the worldwide monetary disaster and in recognition of the chance posed by cash-out refinance loans, underwriting of these kind of refinance loans was severely tightened and the amount of cash-out refinance loans fell. For instance, Freddie Mac, Fannie Mae, and Ginnie Mae all restrict the LTV ratio for cash-out refinance mortgages to 80% or decrease, relying on different danger attributes of the mortgage.5 This considerably reduces the chance of default because the extra fairness a borrower has within the property, the decrease the propensity for default.

Determine 3 exhibits cash-out refinance quantity from Freddie Mac, Fannie Mae, and Ginnie Mae from 2014 by 2020 (be aware that, previous to 2019, the info from Fannie Mae didn’t section charge/time period refinance loans from cash-out refinance loans). Money-out refinance mortgages common roughly $5 billion monthly for Freddie Mac from 2014 by 2019 and roughly $2.5 billion monthly for Ginnie Mae. Beginning in 2019 and persevering with by 2021, cash-out refinance quantity elevated considerably for Freddie Mac and Fannie Mae, exceeding $20 billion monthly for the second half of 2020.

In Milliman’s fashions, the relativity of default danger for a mortgage with an authentic LTV ratio between 75% and 80% in comparison with a mortgage with an authentic LTV ratio between 85% and 90% is roughly 1.75 to 2.00. Due to this fact, whereas cash-out refinance loans are riskier, and have larger default charges, absolutely the quantity of default danger, all else equal, is managed by capping the LTV ratio of the mortgage.

One merchandise to say with respect to the capped loan-to-value ratios, nevertheless, is the elevated use of automated waivers throughout the pandemic. This introduces some stage of uncertainty round cash-out refinance loans in that there’s a danger the precise LTV ratio is larger than the said LTV ratio. Sources of biased value determinations embrace mannequin danger (i.e., the mannequin used to estimate the worth of the property is just not appropriately parameterized), incorrect enter values into the mannequin, and others. Of explicit concern is the influence of the decreased stage of stock on residence costs, which is presently leading to larger residence worth appreciation. With little stock, it’s potential the fashions used for appraisal waivers are biased and don’t replicate a steady-state housing market. To mitigate this danger, appraisal waivers are capped at a 70% LTV ratio, versus 80%.

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Whereas cash-out refinance quantity has elevated considerably in 2020 and 2021, the default dangers of the mortgages are mitigated by tighter underwriting requirements, specifically capped LTV ratios. To mitigate appraisal waiver danger, LTV ratios are additional capped to mitigate danger. Milliman will proceed to observe the efficiency and quantity of cash-out refinance loans. At present, these mortgages don’t seem to current a big danger to the mortgage market.

Elements of default danger

The elements of the MMDI that inform default danger are borrower danger, underwriting danger, and financial danger. Borrower danger measures the chance of the loan defaulting on account of borrower credit score high quality, preliminary fairness place, and debt-to-income ratio. Underwriting danger measures the chance of the loan defaulting on account of mortgage product options comparable to amortization sort, occupancy standing, and different elements. Financial danger measures the chance of the loan defaulting on account of historic and forecasted financial circumstances.


For GSE loans, borrower danger decreased in 2020 This fall relative to 2020 Q3 from a median of 1.07% to 1.03%. The continued low stage of borrower default danger in 2020 This fall is essentially attributable to nearly all of loans being refinance, which has decrease common LTV ratios and better credit score scores. For Ginnie Mae loans, borrower danger elevated in 2020 This fall relative to 2020 Q3 from a median of 5.82% to five.87%. Ginnie Mae loans are usually decrease credit score rating/larger loan-to-value ratio loans.


Underwriting danger represents extra danger changes for property and loan traits comparable to occupancy standing, amortization sort, documentation varieties, loan time period, and others. Underwriting danger after the worldwide monetary disaster stays low and is unfavorable for buy mortgages, which have been usually full-documentation, absolutely amortizing loans.


Financial danger is measured by taking a look at historic and forecasted residence costs. Precise residence worth appreciation has been strong from 2014 by 2020, which has resulted in embedded appreciation for older originations. This ends in decreased credit score danger for older cohorts. For more moderen cohorts, we anticipate slower residence worth progress (or unfavorable progress for some native geographies) after housing provide returns post-pandemic, which contributes to will increase in financial danger for latest origination years.

Determine 4 exhibits the financial danger part of the MMDI for Ginnie Mae mortgages and GSE mortgages as of 2019 This fall and 2020 This fall. What we discover from the chart is that the financial danger part of the index has decreased considerably over the previous 12 months. This displays important residence worth appreciation over the previous 12 months as a perform of stable housing demand and decreased provide. The tempo of residence worth appreciation (in extra of 10% yearly in some metro areas) has resulted in some market members questioning the sustainability of future residence worth appreciation, with some market members calling this market motion a “bubble.”6

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Whereas the present stage of strong residence worth progress is actually a perform of the pandemic and provide/demand imbalances, it’s troublesome to estimate how residence costs could react “post-pandemic.” The MMDI displays a baseline forecast of future residence costs. To the extent precise or baseline forecasts diverge from the present forecast, future publications of the MMDI will change accordingly. Please learn the disclaimer for COVID-19 for extra context on financial danger.



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Concerning the Milliman Mortgage Default Index

Milliman is an professional in analyzing advanced information and constructing econometric fashions which might be clear, intuitive, and informative. Now we have used our experience to help a number of purchasers in creating econometric fashions for evaluating mortgage danger each at level of sale and for seasoned mortgages.

The Milliman Mortgage Default Index (MMDI) makes use of econometric modeling to develop a dynamic mannequin that’s utilized by purchasers in a number of methods together with analyzing, monitoring, and rating the credit score high quality of latest manufacturing, allocating servicing sources, and creating underwriting tips and pricing. As a result of the MMDI produces a lifetime default charge estimate on the loan-level, it’s utilized by purchasers as a benchmarking instrument in origination and servicing. The MMDI is constructed by combining three vital elements of mortgage danger: borrower credit score high quality, underwriting traits of the mortgage, and the financial atmosphere offered to the mortgage. The MMDI makes use of a sturdy dataset of over 30 million mortgage loans, which is up to date often to make sure it maintains the best stage of accuracy.

Milliman is among the largest impartial consulting companies on the planet and has pioneered methods, instruments, and options worldwide. We’re acknowledged leaders within the markets we serve. Milliman perception reaches throughout world boundaries, providing specialised consulting companies in mortgage banking, worker advantages, healthcare, life insurance coverage and monetary companies, and property and casualty insurance coverage. Inside these, Milliman consultants serve a variety of present and rising markets. Purchasers know they will depend upon us as trade specialists, trusted advisers, and inventive problem-solvers.
Milliman’s Mortgage Follow in Milwaukee is devoted to offering strategic, quantitative, and different consulting companies to main organizations within the mortgage banking trade. Previous and present purchasers embrace lots of the nation’s largest banks, personal mortgage warranty insurers, monetary warranty insurers, institutional buyers, and governmental organizations.

For extra info and entry to the loan-level element, together with vendor, geographic, and channel break-outs, please go to the Milliman M-PIRe web site and request a demo.


1For instance, if the MMDI is 10%, then we count on 10% of the mortgages originated in that month to have develop into 180 days or extra delinquent over their lifetimes.

2The MMDI report on 2019 Q2, for instance, is out there at


4Freddie Mac. Chapter 4301: Money-out Refinance Mortgages. Retrieved April 23, 2021, from

5Freddie Mac. Chapter 4203: Most LTV, TLTV and HTLTV Ratios. Retrieved April 23, 2021, from

6Olick, D. (April 13, 2021). ‘When is the housing market going to crash?’ is a red-hot search on Google – right here’s why. CNBC. Retrieved April 23, 2021, from