Accounting for Investments: Trading, Available-for-Sale, Held-to-Maturity, and Equity Method
When a company invests in another company's stocks or bonds, the accounting treatment depends on two things: what type of security it is, and what the investor intends to do with it. Get the classification wrong and you misstate both the income statement and the balance sheet. This guide covers every investment classification under ASC 320 and ASC 323, with complete journal entries for initial recognition, fair value changes, interest/dividend income, and disposal.
The Three Debt Security Classifications
Debt securities (bonds, notes, mortgage-backed securities) are classified at acquisition into one of three categories under ASC 320. The classification determines whether unrealised fair value changes flow through the income statement, through other comprehensive income (OCI), or are not reported at all until realisation.
| Classification | Intent | Balance Sheet | Unrealised Changes |
|---|---|---|---|
| Trading | Buy and sell actively for short-term profit | Fair value (current asset) | Net income (immediately) |
| Available-for-Sale (AFS) | May sell, but no immediate plan | Fair value (current or non-current) | OCI (bypasses net income) |
| Held-to-Maturity (HTM) | Positive intent and ability to hold to maturity | Amortised cost | Not reported (none) |
Trading Securities
Trading securities are debt or equity securities bought primarily for short-term profit from price changes. They are reported at fair value on the balance sheet, and all unrealised gains and losses flow through net income each period — making reported earnings more volatile.
Example: Company A purchases bonds for $50,000 on December 1. At December 31, the fair value is $53,000.
Year-end: DEBIT Trading Securities $3,000 / CREDIT Unrealised Gain — Net Income $3,000
The $3,000 unrealised gain appears on the income statement, increasing net income even though no cash has been received. This is why large bond or equity portfolios in financial institutions create significant income volatility.
Available-for-Sale Securities
AFS securities are also reported at fair value, but unrealised gains and losses bypass net income and go directly to other comprehensive income (OCI), accumulating in accumulated other comprehensive income (AOCI) on the balance sheet. This protects income statement stability for long-term investment portfolios.
CREDIT Unrealised Gain — OCI $3,000
When the AFS security is sold, the cumulative OCI gain or loss is reclassified (recycled) into net income. This reclassification adjustment ensures the full realised gain/loss ultimately passes through the income statement — it just happens later, at sale rather than at each reporting date.
Under ASU 2016-13 (CECL), AFS debt securities are subject to the allowance for credit losses model rather than the old OTTI (other-than-temporary impairment) model. Credit losses are recognised in net income; non-credit fair value changes remain in OCI.
Held-to-Maturity Securities
HTM securities are debt instruments that management has the positive intent and ability to hold to maturity. They are reported at amortised cost — original cost adjusted for premium or discount amortisation — with no fair value adjustments to either income or OCI. This produces the most stable carrying values but requires genuine commitment to hold.
The HTM designation cannot be used casually. If an entity sells or transfers a significant portion of its HTM portfolio before maturity (except for specific permitted reasons), it is required to reclassify the entire remaining HTM portfolio to AFS — a "tainting" rule that deters opportunistic reclassification. Interest income is recognised using the effective interest method. See bond accounting for a full walkthrough of effective interest amortisation.
Equity Securities Under ASU 2016-01
ASU 2016-01 eliminated the AFS classification for equity securities. All equity securities (stocks) where the investor does not have significant influence are now measured at fair value through net income — the same treatment as trading securities. There is no OCI option for equity securities any more.
Exception: equity securities without readily determinable fair values may use the measurement alternative — cost minus impairment, plus or minus observable price changes (orderly transactions for the same investee) — rather than fair value. This is practical for investments in private companies where market prices are not available.
When the Equity Method Applies
Equity securities where the investor has significant influence (typically 20–50% ownership) are removed from the ASC 320 framework entirely and accounted for under the equity method per ASC 323. See the complete equity method accounting guide for the full treatment including the one-line carrying value approach and dividend accounting.
Selling an Investment
When any investment is sold, a realised gain or loss is recognised equal to proceeds minus carrying value at the time of sale. For AFS securities, any unrealised gain or loss sitting in OCI is reclassified to net income as part of the sale transaction — the total recognised gain/loss equals the full economic gain/loss over the holding period.
Sold next year for $55,000:
DEBIT Cash $55,000
CREDIT AFS Securities (carrying value) $53,000
CREDIT Realised Gain on Sale $2,000 (proceeds − FV at last reporting date)
DEBIT Unrealised Gain — OCI (AOCI) $3,000
CREDIT Realised Gain on Sale — Reclassification $3,000
Total recognised in net income: $2,000 + $3,000 = $5,000 (full economic gain from $50K to $55K)
Investment Accounting — Every Classification Covered
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