Stock Option Exercise Tax Optimizer

Stock Option Exercise Tax Optimizer helps estimate Korea-related investment or financial income tax from gains, cost basis, and rates.

Stock option exercise tax optimizer inputs

Best scenario

C. 벤처 양도소득 선택

₩39,569,750 saving versus worst scenario.

Best total tax

₩86,350,000

Effective rate 21.7%.

Non-taxable quota left

₩252,500,000

Applied now ₩247,500,000.

Gross profit

₩397,500,000

Marginal exercise rate 38.0%.

Optimizes Korean stock-option exercise taxation across ordinary earned income, venture non-taxable quota, capital-gains election, installment payment, split exercise, sale tax, local tax, and NPV. This English calculator calls the same pure tax calculation function used by the Korean page. Inputs and labels are translated; the formula is not replaced by a generic value-times-rate stub.

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Stock option exercise tax optimizer

This page translates the Korean stock option exercise tax optimizer and preserves ordinary earned-income taxation, venture-company benefits, sale tax, split exercise, and 5-year installment NPV logic.

Exercise taxation

Ordinary stock-option exercise gains are generally treated as earned income. The calculator combines annual salary, other income, deductions, and credits to find the marginal rate applied to the exercise gain.

For qualified venture-company options, the model tests the KRW 500 million venture non-taxable limit, the venture capital-gains election, and 5-year installment payment. The best scenario is chosen from the applicable options.

Sale taxation

The sale side calculates gross sale value, sale gain, capital-gains tax, local tax, and the KRW 2.5 million capital-gains basic deduction where applicable. Foreign-company options also use exchange-rate inputs for grant, exercise, and sale.

Split exercise analysis compares lump-sum exercise with 2-year, 3-year, and 5-year strategies. The installment scenario uses a 4 percent NPV discount assumption to show the value of deferred payment.

Planning use

Use this calculator before exercising options in a high-salary year, before an IPO, or before a secondary sale. The best tax outcome can change when the venture qualification, used non-taxable quota, sale price, or salary changes.

The output is a planning estimate, not a substitute for grant-document review. Option type, company qualification, board approvals, foreign employer withholding, and sale restrictions can change the actual filing position.