Federal Section 1244 Small Business Stock Loss Deduction Calculator

How this calculator works

IRC § 1244 is the federal tax code's nicest treatment of a bad investment outcome. A typical failed startup investment generates a capital loss — limited to $3,000/year against ordinary income under IRC § 1211(b), with the excess carrying forward indefinitely at the same $3,000/year clip. For a $100,000 loss with no offsetting capital gains, that is a 33-year deduction trickle. § 1244 reclassifies the loss as ORDINARY — fully deductible against ordinary income in the year of loss at the marginal rate, up to a per-year cap ($50,000 single / $100,000 MFJ).

This calculator runs the eligibility chain, applies the per-year cap, computes the residual capital-loss carryforward, and projects the 10-year cumulative federal tax savings. The output tells the investor (and the tax preparer running the cleanup) how much immediate cash they get back and how long the residual capital piece will take to bleed out.

The 26 USC § 1244 framework

§ 1244(a) is the operative rule: losses on § 1244 stock are treated as ORDINARY losses, fully deductible against ordinary income in the year of loss. § 1244(b) sets the per-year cap at $50,000 for single filers (and married filing separately, head of household) and $100,000 for married filing jointly. Losses above the cap are reclassified as CAPITAL losses subject to the regular § 1211(b) treatment.

§ 1244(c)(1) defines § 1244 stock — the issuer must be a domestic corporation (C-corp or S-corp), the stock must have been issued for money or property other than stock or securities, and the corporation must satisfy the small-business and operating-company tests.

§ 1244(c)(2) is the operating-company test: more than 50% of gross receipts during the 5 most recent taxable years must come from non-passive sources (royalties, rents, dividends, interest, annuities, sales of stock or securities). A safe-harbor exception under § 1244(c)(2)(A) covers corporations whose deductions exceeded gross receipts during the lookback — most loss-stage start-ups qualify under the safe harbor.

§ 1244(c)(3)(A) is the small-business test: at the time the stock was issued, the corporation's aggregate amounts received for stock + paid-in surplus + contributions to capital did not exceed $1,000,000. The cap is applied at the moment of issuance; capital raised after the corporation has exceeded $1M is not § 1244-eligible.

§ 1244(d) limits the benefit to the ORIGINAL HOLDER. Gifts, inheritances, and secondary purchases do not carry § 1244 character forward.

§ 165(g) is the worthlessness rule that typically triggers a § 1244 claim. When a security becomes wholly worthless during the taxable year, § 165(g) treats it as sold or exchanged on the last day of the year for $0 — the loss is fixed and the § 1244 character (if otherwise applicable) attaches.

Inputs explained

Original cost is the taxpayer's basis in the stock — cash paid plus FMV of any property contributed to the corporation in exchange for the stock at original issuance. Sale price is the proceeds received on disposition; enter 0 for a formal worthlessness/abandonment under § 165(g).

Filing status drives the per-year § 1244(b) cap. MFJ gets $100,000; all others get $50,000. The cap also drives the residual capital-loss treatment — MFS taxpayers are limited to $1,500/year ordinary offset on the residual capital piece (vs $3,000/year for all other statuses).

Marginal ordinary rate is the year-of-loss federal ordinary rate. The § 1244 advantage scales linearly with this rate. A $100,000 ordinary deduction saves $37,000 at the top bracket vs $22,000 at the 22% bracket. The same loss as a capital loss bleeds out at $3,000 × rate per year — a 16-50x slower recovery depending on rate.

Issuer paid-in capital at issuance is the corporation's aggregate paid-in capital as of the moment the stock was issued. The § 1244(c)(3)(A) cap is $1,000,000. If the issuer was already above $1M when the stock was issued, the stock is not § 1244-eligible and the entire loss is capital.

Issued for money or property is the § 1244(c)(1)(B) test — stock issued in a § 351 incorporation in exchange for cash or tangible business assets qualifies; stock-for-stock swaps, securities-for-stock issuances, and compensation-for-services issuances do not. Issuer was an operating company is the § 1244(c)(2) test — confirm with the issuer's gross-receipts breakdown over the 5-year lookback. Taxpayer is original holder is the § 1244(a)/(d) test — gifts, inheritances, and secondary purchases do not carry § 1244 forward.

Key thresholds and gotchas

The $1M paid-in capital cap is the most common eligibility trap. The cap is measured at issuance, not at any later valuation. A start-up that raised $400K in seed (qualifies) then $800K in Series A (crosses the $1M total) presents a split-round situation under Treas. Reg. § 1.1244(c)-2(b) — shares issued up to the $1M total qualify, shares above do not. Most CFOs apply the cap conservatively at the round level: if a round crossed the cap, the entire round is non-§-1244. Late-stage rounds at well-funded start-ups never qualify; § 1244 is structurally a seed-and-early-A benefit.

The original-holder requirement is the second-most-common trap. § 1244 does NOT carry over through gifts, inheritances, or secondary purchases. A founder who gifts § 1244 stock to a family trust before a worthlessness event has converted ordinary-loss character to capital-loss character at the trust level — almost always a bad outcome. An angel who buys shares from another shareholder on a secondary market holds non-§-1244 stock regardless of the issuer's underlying eligibility.

The per-year cap is not inflation-adjusted. The $50,000 single / $100,000 MFJ caps were set in the Tax Reform Act of 1984 and have not been updated since. A $100,000 loss in 1984 dollars is roughly $300,000 in 2026 dollars — the real-dollar value of the benefit has eroded by two-thirds since enactment. Practitioners increasingly hit the cap on even modest failed-investment losses.

The operating-company test rarely binds in practice for true start-ups (the loss-stage safe harbor under § 1244(c)(2)(A) covers most pre-revenue companies), but it absolutely binds for holding companies, real-estate-only entities, and investment vehicles. If the failed investment was structured as a holding company that owned operating subs, § 1244 may not attach at the holding-company level — confirm the gross-receipts character before claiming.

Worthlessness timing matters. § 165(g) treats the loss as recognized on the LAST DAY of the year of worthlessness. Claiming the loss in the wrong year (typically too early — before the corporation has truly ceased to have any realizable value) is the most-litigated § 1244 timing issue. Document the worthlessness determination with board resolutions of dissolution, liquidation filings, no-asset bankruptcy schedules, or other contemporaneous evidence of zero realizable value.

What this calculator does NOT model

This is a single-year disposition tool. The 10-year capital-savings projection assumes a flat $3,000/year ordinary offset against the residual capital piece — actual carryforward utilization depends on the taxpayer's future capital-gain stream. A taxpayer with offsetting capital gains can soak up the residual capital loss dollar-for-dollar; a taxpayer with no future capital gains sees the residual trickle out at the $3,000 cap.

Eligibility tests are user-confirmed booleans (issuer paid-in capital, money-or-property issuance, operating-company test, original-holder status). The calculator does not independently verify these — it trusts the user input. For an audit-defensible position, confirm each test with documentation in the file before relying on the calculator's eligibility conclusion.

State income tax is not modeled. Most states with income taxes conform to § 1244 by reference to federal AGI, but state rates stack on top of federal — a top-bracket California taxpayer in the 13.3% state bracket sees an additional state-level benefit from § 1244 ordinary treatment. Some states have idiosyncratic adjustments to the federal AGI baseline; confirm conformity in the taxpayer's state.

Net Investment Income Tax (NIIT) under IRC § 1411 is not modeled. § 1244 ordinary loss reduces AGI for NIIT-threshold purposes; the residual capital loss reduces net investment income directly. For taxpayers whose MAGI is near the NIIT threshold ($250K MFJ, $200K single), the indirect NIIT benefit can be meaningful.

Multi-year layering of § 1244 dispositions is not modeled. A taxpayer who liquidates multiple failed investments across consecutive years can use the per-year cap each year — but the calculator treats each year independently.

QSBS interaction is not modeled. Stock that qualifies as § 1202 QSBS at issuance often also qualifies as § 1244 stock (the small-business and operating-company tests overlap). For a successful exit, § 1202 gives gain exclusion; for a failed exit, § 1244 gives ordinary loss. Use both calculators to model both outcomes when planning an early-stage investment.

Sources

IRC § 1244(a) is the operative rule (ordinary loss treatment). IRC § 1244(b) sets the per-year cap. IRC § 1244(c)(1) defines § 1244 stock; IRC § 1244(c)(2) is the operating-company test; IRC § 1244(c)(3) is the $1M paid-in-capital cap. IRC § 1244(d) limits the benefit to original holders and covers basis adjustments and recapitalization carryover.

IRC § 165(g) is the worthlessness rule that triggers most § 1244 claims. IRC § 1211(b) is the $3,000/year ordinary-offset cap on capital losses ($1,500 MFS). IRC § 1212(b) is the indefinite capital-loss carryforward.

Treas. Reg. § 1.1244(c)-1 spells out the qualifying-stock requirements. Treas. Reg. § 1.1244(c)-2 handles the small-business cap mechanics including the split-round treatment when a financing round crosses the cap.

IRS Form 4797 Part II is the ordinary-loss reporting line for § 1244 losses. IRS Form 8949 and Schedule D handle the residual capital piece. Pub. L. 85-866 (Small Business Tax Revision Act of 1958) enacted § 1244; Pub. L. 98-369 (Tax Reform Act of 1984) set the current cap structure.