ASC 320 Debt Securities — Trading, AFS and HTM Classification

ASC 320 Debt Securities — Core Rule

ASC 320 requires entities to classify every debt security into one of three categories at acquisition — trading, available-for-sale (AFS), or held-to-maturity (HTM) — based on the entity's intent and ability to hold the security. The category determines both the measurement basis and where gains and losses appear in the financial statements (ASC 320-10-25-1).

How ASC 320 Debt Securities Works

• Trading securities (ASC 320-10-25-1(a)): A security is classified as trading when it is bought and held principally for the purpose of selling in the near term — the entity has an active pattern of short-term profit-taking from price or interest-rate movements. Trading securities are measured at fair value each reporting date, with all unrealised gains and losses recognised immediately in net income (ASC 320-10-35-1(a)). Trading is an affirmative designation; you cannot default into it.

• Held-to-maturity securities (ASC 320-10-25-1(c)): HTM requires both positive intent and demonstrated financial ability to hold the security until its contractual maturity. Positive intent is a firm commitment, not merely an intent to hold unless circumstances change. HTM securities are measured at amortised cost using the effective interest method; fair value changes are not recognised in the financial statements (ASC 320-10-35-10). Because HTM locks in amortised cost accounting, FASB imposes strict restrictions on transfers out of the category.

• Available-for-sale securities (ASC 320-10-25-1(b)): AFS is the residual category — any debt security that is neither trading nor HTM. AFS securities are measured at fair value, but unrealised gains and losses bypass net income and are recorded in Other Comprehensive Income (OCI). They are reclassified from OCI to earnings only on sale or when a credit loss is recognised (ASC 320-10-35-1(b)).

The tainted-portfolio rule for HTM

If an entity sells or transfers a security out of HTM before maturity in a way not covered by the six permitted exceptions in ASC 320-10-25-6, the entire HTM portfolio is "tainted." A tainted entity cannot classify any new debt security as HTM for the current and following two fiscal years (ASC 320-10-25-3).

The six permitted exceptions are:

1. Sale within 3 months of the security's maturity (or probable call date) — ASC 320-10-25-6(a)
2. Sale after collecting at least 85% of the original principal — ASC 320-10-25-6(b)
3. Significant deterioration in the issuer's creditworthiness — ASC 320-10-25-6(c)
4. Change in tax law eliminating or significantly reducing the security's tax-exempt status — ASC 320-10-25-6(d)
5. Major business combination or disposition requiring the sale to maintain the entity's existing interest-rate risk or credit-risk position — ASC 320-10-25-6(e)
6. Change in statutory or regulatory requirements on permissible investments, or a significant increase in industry regulatory capital requirements forcing a portfolio reduction — ASC 320-10-25-6(f)/(g)

Note that a generic "isolated event" or "unexpected circumstance" is not a seventh catch-all exception. Exception (f)/(g) is specific to regulatory capital requirements and is separate from the issuer credit deterioration exception (c).

Impairment — CECL under ASC 326

Under ASU 2016-13, impairment accounting for debt securities differs by category:

• HTM securities: Apply the CECL model (ASC 326-20). Recognise a lifetime allowance for expected credit losses as a valuation allowance against the amortised cost basis. All credit losses flow through net income.
• AFS securities: Apply ASC 326-30. If the fair value is below amortised cost, assess whether the difference is credit-related or interest-rate/other-related. Credit losses are recognised through an allowance (capped at the unrealised loss), flowing through net income. Non-credit fair value movements remain in OCI.

Trading securities are not subject to impairment testing because fair value changes — including credit deterioration — are already recognised in net income each period.

Reclassifications between categories

Reclassifications are rare and subject to strict conditions. Transfers from HTM to AFS or trading (outside the six permitted exceptions) taint the portfolio. Transfers from trading to AFS or HTM are generally prohibited by the FASB's intent-based model — once designated as trading, the security stays in that category. Transfers from AFS to HTM are permitted and recorded at fair value at the transfer date; any unrealised OCI balance at transfer is amortised to income over the remaining life of the security.

ASC 320 Debt Securities — Practical Example

At December 31, a regional bank holds three debt securities:

The bank also holds a second corporate bond in AFS with a fair value $80,000 below amortised cost. Of that $80,000 decline, $50,000 is attributable to issuer credit deterioration. The bank recognises a $50,000 allowance for credit losses in net income and leaves the remaining $30,000 non-credit decline in OCI.

In the following year, the bank sells the municipal HTM bond two years before maturity to fund a major acquisition. If the acquisition qualifies as a "major business combination" under ASC 320-10-25-6(e) and the sale was required to maintain the bank's existing interest-rate risk profile, the sale falls within the permitted exception. If it does not qualify, the HTM portfolio is tainted and no new HTM designations are available for two years.

ASC 320 Debt Securities — Common Pitfalls

• Treating AFS as a flexible reserve: Classifying securities as AFS because "we might sell" while disclosing long holding periods creates auditor scrutiny. If the entity has no realistic intention to sell before maturity and has the financial capacity to hold, HTM may be required — or at least supportable — and avoids OCI volatility.

• Underestimating the taint consequence: Entities sometimes sell a small HTM security for liquidity and overlook the two-year taint. The consequence is significant: the entire portfolio must be reclassified to AFS, introducing fair value volatility into OCI for all previously protected HTM positions. Document exception eligibility before any sale.

• Conflating the regulatory capital exception with a general catch-all: ASC 320-10-25-6(f)/(g) applies specifically to legislated or regulatory changes in capital requirements — not to a voluntary decision to rebuild a capital buffer or respond to management stress tests. Entities incorrectly applying this exception to internally driven capital decisions risk taint and restatement.

• AFS impairment — not recognising credit losses promptly: Under ASC 326-30, a credit loss must be recognised as soon as the fair value declines below amortised cost and the decline is at least partly credit-driven. Deferring recognition until the decline is "other than temporary" (the pre-ASU 2016-13 standard) is a prior-period error under current US GAAP.

ASC 320 Debt Securities — Key Paragraphs

• ASC 320-10-25-1 — Three-category classification framework
• ASC 320-10-25-3 — HTM tainted-portfolio restriction
• ASC 320-10-25-6 — Six permitted exceptions for HTM transfers
• ASC 320-10-35-1 — Measurement by category
• ASC 320-10-35-10 — HTM amortised cost measurement
• ASC 326-20 — CECL model for HTM securities
• ASC 326-30 — Credit loss model for AFS securities