ALLSTATE CORP

Underwriting results are significantly influenced by estimates of claims and claims expense reserves. For a description of our reserve process, see Note 9 of the consolidated financial statements. Further, for a description of our reserving policies and the potential variability in our reserve estimates, see the Application of Critical Accounting Estimates section of the MD&A. These reserves are an estimate of amounts necessary to settle all outstanding claims, including IBNR claims, as of the reporting date.

The facts and circumstances leading to reestimates of reserves relate to changes in claim activity and revisions to the development factors used to predict how losses are likely to develop from the end of a reporting period until all claims have been paid. Reestimates occur when actual losses differ from those predicted by the estimated development factors used in prior reserve estimates.

We believe the net loss reserves exposures are appropriately established based on available facts, laws and regulations.

(1)Includes $6.36 billion, $6.66 billion and $6.64 billion of unpaid indemnification recoverables related to the Michigan Catastrophic Claims Association (“MCCA”) as of December 31, 2023, 2022 and 2021, respectively.

(2)Ratios are calculated using property and casualty premiums earned.

NM = not meaningful

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The following tables reflect the accident years to which the reestimates shown above are applicable. Favorable reserve reestimates are shown in parentheses.

Allstate Protection

The tables below show Allstate Protection net reserves representing the estimated cost of outstanding claims as they were recorded at the beginning of years 2023, 2022, and 2021, and the effect of reestimates in each year.

(1)2022 includes a $944 million reclassification of reserves from homeowners to auto.

(2)2023 and 2022 include the unamortized fair value adjustment related to the acquisition of National General.

Unfavorable reserve reestimates in 2023 were primarily due to National General personal auto lines, homeowners and commercial lines.

Unfavorable reserve reestimates for personal auto in 2022 were primarily from bodily injury and physical damage coverages. Increases in injury coverages reflected recent data and updated assumptions related to severity of third-party bodily injury claims,

The Allstate Corporation 57 increased claims with attorney representation, litigation costs, increased medical treatment utilization and higher medical inflation. Increases in physical damage reflected the ongoing inflationary factors and supply chain shortages impacting used vehicle and parts prices, labor rates and length of claim resolution. Delays in the receipt of claims, including third-party carrier claims also contributed to the adverse development of claims reported in prior years. Unfavorable reserve reestimates for commercial were primarily from auto injury coverages for both shared economy and traditional segments with a large portion of the traditional segment increase related to states where the Company will no longer be selling new business.

Run-off Property-Liability

We conduct an annual review in the third quarter of each year to evaluate and establish asbestos, environmental and other run-off reserves. Reserves are recorded in the reporting period in which they are determined. Using established industry and actuarial best practices and assuming no change in the regulatory or economic environment, this detailed and comprehensive methodology determines reserves based on assessments of the characteristics of exposure (e.g. claim activity, potential liability, jurisdiction, products versus non-products exposure) presented by policyholders.

Reserve reestimates in 2023 primarily related to new reported information and defense costs for asbestos and other run-off exposures and higher than expected environmental reported losses.

Reserve reestimates in 2022 primarily related to new reported information and defense costs for asbestos and higher than expected reported losses for environmental and other run-off exposures.

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The survival ratio is calculated by taking our ending reserves divided by payments made during the year. This is a commonly used but simplistic and imprecise approach to measuring the adequacy of asbestos and environmental reserve levels. Many factors, such as mix of business, level of coverage provided and settlement procedures have significant impacts on the amount of environmental and asbestos claims and claims expense reserves, claim payments and the resultant ratio. As payments result in corresponding reserve reductions, survival ratios can be expected to vary over time. The asbestos and environmental net 3-year survival ratio in 2023 increased from 2022 due to lower average payments.

IBNR net reserves decreased $7 million as of December 31, 2023 compared to December 31, 2022. IBNR provides for reserve development of known claims and future reporting of additional unknown claims from current policyholders and ceding companies.

Reinsurance and indemnification programs We utilize reinsurance to reduce exposure to catastrophe risk and manage capital, and to support the required statutory surplus and the insurance financial strength ratings of certain subsidiaries such as Castle Key Insurance Company (“CKIC”) and Allstate New Jersey Insurance Company (“ANJ”). We purchase significant reinsurance to manage our aggregate countrywide exposure to an acceptable level. The price and terms of reinsurance and the credit quality of the reinsurer are considered in the purchase process. We have also purchased reinsurance to mitigate exposures in our long-tail liability lines, including environmental, asbestos and other run-off lines as well as our commercial lines, including shared economy. We also participate in various indemnification mechanisms,

including state-based industry pool or facility programs mandating participation by insurers offering certain coverage in their state and the federal government National Flood Insurance Program (“NFIP”). See Note 11 of the consolidated financial statements for additional details on these programs.

Intercompany reinsurance We enter into certain intercompany insurance and reinsurance transactions in order to maintain underwriting control and manage insurance risk among various legal entities. These reinsurance agreements have been approved by the appropriate regulatory authorities. All significant intercompany transactions have been eliminated in consolidation.

Catastrophe reinsurance We anticipate completing the placement of our 2024 nationwide catastrophe reinsurance program in the first half of 2024. For further details of the existing 2023 program, see Note 11 of the consolidated financial statements.

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(1)N/A reflects no S&P Global Ratings (“S&P”) or A.M. Best ratings available.

(2)As of December 31, 2023 and 2022, MCCA includes $62 million of reinsurance recoverable on paid claims and $6.36 billion and $6.66 billion of reinsurance recoverable on unpaid claims, respectively.

(3)Other reinsurance recoverables primarily relate to commercial lines, including shared economy, as well as asbestos, environmental and other liability exposures.

Reinsurance and indemnification recoverables include an estimate of the amount of insurance claims and claims expense reserves that are ceded under the terms of the agreements, including IBNR unpaid losses. We calculate our ceded reinsurance and indemnification estimates based on the terms of each applicable agreement, including an estimate of how IBNR losses will ultimately be ceded under the agreement. We also consider other limitations and coverage exclusions under our agreements. Accordingly, our estimate of recoverables is subject to similar risks and uncertainties as our estimate of reserves for claims and claims expense. We believe the recoverables are appropriately established; however, as our underlying reserves continue to develop, the amount ultimately recoverable may vary from amounts currently recorded. We regularly evaluate the reinsurers and the respective amounts of our reinsurance recoverables, and a provision for uncollectible reinsurance recoverables is recorded, if needed. The establishment of reinsurance recoverables and the related allowance for

uncollectible reinsurance is also an inherently uncertain process involving estimates. Changes in estimates could result in additional changes to the Consolidated Statements of Operations.

Indemnification recoverables are considered collectible based on the industry pool and facility enabling legislation and the Company has not had any credit losses related to these programs and we do not anticipate losses in the foreseeable future. We also have not experienced credit losses on our catastrophe reinsurance programs, which include highly rated reinsurers.

The allowance for uncollectible reinsurance relates to other reinsurance programs primarily related to our Run-off Property-Liability segment. The allowance was $62 million as of December 31, 2023 and 2022.

The allowance is based upon our ongoing review of amounts outstanding, length of collection periods, changes in reinsurer credit standing, and other relevant factors. In addition, in the ordinary course of

60 www.allstate.com business, we may become involved in coverage disputes with certain of our reinsurers that may ultimately result in lawsuits and arbitrations brought by or against such reinsurers to determine the parties’ rights and obligations under the various reinsurance agreements. We employ dedicated specialists to manage reinsurance collections and disputes. We also consider recent developments in commutation activity between reinsurers and cedents, and recent trends in arbitration and litigation outcomes in disputes between cedents and reinsurers in seeking to maximize our reinsurance recoveries.

Adverse developments in the insurance industry have led to a decline in the financial strength of some of our reinsurance carriers, causing amounts

recoverable from them and future claims ceded to them to be considered a higher risk. There has also been consolidation activity in the industry, which causes reinsurance risk across the industry to be concentrated among fewer companies.

See Note 2 of the consolidated financial statements for a description of the methodology utilized to calculate the allowance for reinsurance recoverables.

For further details related to our reinsurance and indemnification recoverables, see the Regulation section in Part I and Note 11 of the consolidated financial statements.

In 2023, ceded premiums earned increased primarily due to catastrophe reinsurance. In 2022, ceded premiums earned decreased primarily due to the expiration of legacy National General reinsurance programs.

In 2023, ceded claims and claims expenses decreased $967 million primarily due to lower amounts related to NFIP, and a reduction in gross reserves for

Michigan personal injury protection coverage. In 2022, ceded claims and claims expenses decreased $1.88 billion primarily due to higher gross catastrophe losses in 2021 that resulted in reinsurance activity. For further discussion of these items, see Regulation, Indemnification Programs and Note 11 of the consolidated financial statements.

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(1)Paid claims and claims expenses reported in the table for the current and prior years, recovered from the MCCA totaled $106 million, $114 million and $117 million in 2023, 2022 and 2021, respectively.

(2)Gross reserves for the year ended December 31, 2023, comprise 77% case reserves and 23% IBNR. Gross reserves for the year ended December 31, 2022, comprise 76% case reserves and 24% IBNR. Gross reserves for the year ended December 31, 2021, comprise 74% case reserves and 26% IBNR. The MCCA does not require member companies to report ultimate case reserves.

Pending MCCA claims differ from most personal lines insurance pending claims as other personal lines policies incurred claims settle in shorter periods due to having a coverage limit. MCCA claims can be outstanding for a claimant’s lifetime, as there is no contractual limitation. Many of these injuries are catastrophic in nature, resulting in serious permanent disabilities that require attendant and residential care for periods that may span decades. A significant portion of the ultimate incurred claim reserves and the recoverables can be attributed to a small number of catastrophic claims that occurred more than five years ago and continue to pay lifetime benefits.

As of December 31, 2023, approximately 1,350 of our catastrophic claims that are eligible for reimbursement are pending with the MCCA, of which approximately 80% represents claims that occurred more than 5 years ago. There are 74 claims with reserves in excess of $15 million as of December 31, 2023, which comprise approximately 30% of the gross ending reserves in the table above. As a result, significant developments with a single claimant can result in volatility in prior year incurred claims.

(1)Total claims includes those covered and not covered by the MCCA indemnification.

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