ASC 326, known as the current expected credit losses model or CECL, is the FASB standard that requires you to estimate and record expected credit losses on most financial assets the moment they hit your books, rather than waiting for a loss event. Introduced through ASU 2016-13, it replaced the incurred-loss model and now governs how banks, insurers, public companies, private companies, and not-for-profits reserve for credit risk on loans, held-to-maturity securities, trade receivables, lease receivables, and similar assets.
The rule is fully in effect across every category of filer.
What ASC 326 Changed
Under the old incurred-loss approach, a credit loss went on the books only after a specific event made it probable: a missed payment, a bankruptcy, or another clear signal of trouble. ASC 326 moves recognition to the front of the timeline. From the date you originate or acquire a financial asset measured at amortized cost, you estimate the total credit losses you expect over the asset’s entire remaining contractual life and record an allowance immediately.
The estimate draws on three inputs: historical loss experience on similar assets, current economic conditions, and reasonable and supportable forecasts of the future. FASB does not fix a forecast horizon. Some entities forecast over the full remaining life of an asset; others use a shorter window depending on data availability and asset type. The horizon is a judgment call and can differ across portfolios inside the same organization.
For any part of the asset’s life that extends past what you can reasonably forecast, you revert to historical loss information. The reversion method is flexible: immediate, straight-line phase-in, or another rational and systematic approach. When you revert, you still adjust historical data for differences in current asset characteristics such as underwriting standards or portfolio mix, but you do not adjust historical loss rates for economic expectations beyond the forecast window.
Which Assets and Entities Are in Scope
ASC 326 applies to any entity that prepares financial statements under U.S. GAAP and holds financial assets within scope. That means banks, credit unions, insurance companies, public corporations, private companies, and not-for-profits. Many commercial businesses that are not financial institutions discover they are subject to the rule because of trade receivables or held-to-maturity investments.
The financial assets measured at amortized cost that fall under the main CECL model include:
- Loans held for investment, including commercial real estate loans, consumer loans, and lines of credit
- Held-to-maturity debt securities
- Trade receivables from selling goods or services on credit
- Net investments in leases held by lessors
- Reinsurance receivables
- Off-balance-sheet credit exposures such as unfunded loan commitments, standby letters of credit, and financial guarantees not accounted for as derivatives
For many non-financial companies, trade receivables are the main asset touched by CECL. A provision matrix, which is essentially an aging schedule with historical loss percentages applied to buckets like current, 1–30 days past due, 31–60 days, and so on, is the common approach. You then adjust the rates for current conditions and forecasts. One point that catches companies off guard: you must consider whether expected losses should be recorded on receivables that are current and not past due. A blanket zero-loss assumption on current balances is not allowed unless you can genuinely support it.
Assets Carved Out
Several categories are intentionally excluded:
- Financial assets measured at fair value through net income, because credit risk is already captured in the fair value adjustment
- Loans between entities under common control
- Loans to participants in employee benefit plans such as 401(k)s
- Derivatives, which are governed by ASC 815
- Certain insurance contracts subject to their own framework
How to Estimate Expected Credit Losses
FASB deliberately avoided prescribing a single calculation. You choose a method that fits your data, portfolio, and resources, apply it consistently, and disclose it. Common approaches include:
- Loss-rate method, which applies historical loss percentages to the current balance and adjusts for forecasts and current conditions
- Vintage analysis, which tracks charge-offs by origination year and projects losses using the pattern for each vintage
- Discounted cash flow, which compares the present value of projected cash flows to the amortized cost basis
- Probability of default and loss given default, calculated as PD times LGD times exposure at default
- Roll-rate method, which estimates migration between delinquency buckets to eventual charge-off
- Aging schedule, common for trade receivables
- Weighted-average remaining maturity, or WARM, often used by smaller institutions as a simpler approach
Whichever method you use, the estimate must reflect expected loss even when the risk is remote, so long as it is not zero. Inputs, data sources, and assumptions all need documentation.
Grouping Assets by Risk
CECL generally requires you to measure expected losses on a collective basis by pooling assets with similar risk characteristics. Relevant factors can include credit scores, risk ratings, asset type, collateral, loan size, interest rate, term, geography, borrower industry, and vintage year. The choice should track how you actually manage credit risk. The pools are not static: if a borrower’s condition deteriorates or an asset otherwise no longer shares risk characteristics with its pool, you evaluate whether it belongs in a different pool or should be assessed individually.
When Zero Expected Loss Is Supportable
Not every asset requires a recorded allowance. OCC guidance identifies situations where a zero-loss expectation may be reasonable:
- U.S. Treasury securities and agency mortgage-backed securities guaranteed by Ginnie Mae, Freddie Mac, or Fannie Mae
- Loans fully secured by cash or cash equivalents, such as a loan collateralized by a CD at the lending bank
- Government-guaranteed loan portions, including SBA loans unconditionally guaranteed by the U.S. government and VA or FHA home loans with favorable claims history
- Assets with a long track record of zero losses, high credit ratings, and no expected downgrade
Collateral coverage alone is not enough. You cannot assume zero loss simply because the collateral’s current value exceeds the loan balance, unless the asset is formally classified as collateral-dependent and the borrower is in financial difficulty.
Off-Balance-Sheet Commitments
A contractual obligation to extend credit in the future generally produces a liability for expected credit losses. The estimate considers both the likelihood the commitment will be funded and the expected losses on the amounts that get funded. If you have an unconditional right to cancel the commitment at any time, no liability is required. If cancellation requires a notice period, you must provide for credit losses during that exposure window. For financial guarantees, the guarantor carries two separate liabilities: the fair value of the stand-ready obligation and the expected credit loss on the guarantee itself.
Available-for-Sale Debt Securities Follow a Different Path
AFS debt securities sit inside ASC 326 but follow Subtopic 326-30 rather than the main CECL model in 326-20. Because these securities are already carried at fair value, credit losses are measured differently. When fair value drops below amortized cost, you determine how much of the decline is credit-related. Credit losses go through an allowance, capped at the difference between fair value and amortized cost; the non-credit portion flows through other comprehensive income.
This replaced the old other-than-temporary impairment framework, which required a permanent write-down of the cost basis. Under the new approach, if credit conditions improve, you can reverse a previously recorded allowance, though the allowance cannot go below zero. One exception: if you intend to sell the security, or will more likely than not be required to sell it before recovery, you write the cost basis down to fair value and run the entire impairment through earnings.
Disclosure Requirements
ASC 326 carries substantial disclosure obligations. Every entity in scope must provide:
- Credit quality information by class of receivable, including a description of credit quality indicators and the amortized cost basis grouped by those indicators
- A rollforward of the allowance by portfolio segment, showing beginning balance, provision, write-offs, recoveries, and ending balance
- Aging of past-due balances and details on nonaccrual assets, including any interest income recognized on them
- Information on collateral-dependent assets, including collateral type and how it secures the exposure, when the borrower is in financial difficulty
- The methodology used to estimate the liability for off-balance-sheet exposures, including the key judgments involved
- The methods used to estimate expected credit losses, by portfolio segment
Public business entities also present vintage disclosures: the amortized cost basis of financing receivables and net investments in leases, broken out by credit quality indicator and origination year. Balances older than the fifth annual period can be aggregated. Public entities also report gross write-offs by vintage year on a year-to-date basis. Line-of-credit arrangements such as credit cards are reported separately rather than by vintage, because draw timing does not align with underwriting. Reinsurance recoverables are exempt from the vintage requirement, and private companies and not-for-profits are not required to provide vintage disclosures at all.
Effective Dates and Transition
Adoption was phased in by entity type:
- SEC-filing public business entities: fiscal years beginning after December 15, 2019
- Other public business entities: fiscal years beginning after December 15, 2020
- Private companies and not-for-profits: fiscal years beginning after December 15, 2021
All deadlines have passed, so CECL is in effect for every entity in scope. Adoption used the modified retrospective method. Rather than restating prior periods, entities recorded a one-time cumulative-effect adjustment to retained earnings at the start of the adoption period, equal to the difference between the new CECL allowance and the old incurred-loss allowance, net of tax. Prior-period statements stay as originally reported.
Internal Controls and Governance
Because CECL leans on management judgment (forecast assumptions, model selection, qualitative overlays), it demands strong internal controls. Entities need documented processes for evaluating whether chosen models remain appropriate, verifying input data, and supporting qualitative adjustments with quantitative evidence. Where internal data is incomplete or unreliable, supplementing with external information is expected rather than optional.
SEC registrants face particular scrutiny under SAB 119, which calls for a consistent and systematic estimation process with clear documentation of the judgments made. For public companies, the CECL allowance process sits squarely within internal control over financial reporting, and auditors will test the design and effectiveness of controls covering model governance, data integrity, and forecast assumptions.