Covered-Call ETF Income and Total Return Calculator

Compare covered-call ETF income with total wealth

Monthly distributions can help organize a retirement spending budget.
A high distribution yield, however, does not tell you whether a covered-call ETF will leave more wealth than an ordinary index ETF.
A covered-call strategy holds underlying assets and sells calls, receiving option premiums in exchange for giving up some upside on the covered portion.
Strong equity gains can therefore exceed the strategy’s participation, while declines can exceed the premium cushion.

This calculator applies coverage, a strike cap, premiums and fees to the same monthly underlying price path.
It separates holding distributions in cash from reinvesting them and measures total wealth as the ETF value plus retained cash.
The account comparison uses 2026 Korean rules for Korea-listed products held in taxable accounts, ISAs and pension savings or IRP accounts.
All money values are in KRW; this is not a US or other foreign tax calculator, a product recommendation or a return forecast.

What the calculator compares

Inputs, meanings and units

• Investment: the starting holding value, from KRW 1 to 1 trillion.
  The comparison does not imply that this amount can be contributed to an ISA or pension today.
  
• Option coverage: the percentage of assets covered by written calls, from 0% to 100%.
  Premiums are quoted per covered notional: 50% coverage and a monthly premium of 0.8% contribute 0.4% of total starting assets each month.
  
• Strike above spot: the call strike’s distance above each month’s starting price, reset monthly.
  Zero is at the money, or ATM.
  A higher strike may produce a different real premium; this model accepts strike and premium as independent assumptions.
  
• Price returns and dividends: enter price returns excluding dividends.
  Using a dividend-inclusive total-return index and adding a separate dividend input would count dividends twice.
  
• Premium, dividend and fees: monthly premium and dividend inputs each allow 0–20%, and each annual fee allows 0–20%.
  Annual fees are divided evenly over twelve months.
  These validation ranges do not represent normal product yields or expected returns.
  
• Taxable source shares: enter the confirmed taxable percentage of option-premium and dividend sources separately, each from 0% to 100%.
  Actual monthly shares and tax NAV may change; the entered constant shares are scenario assumptions.
  

Monthly formulas without double-counting payouts

Korean domestic and foreign-underlying distribution sources

Income Tax Act Article 17 classifies qualifying investment-fund profits as dividend income.
Enforcement Decree Article 26-2(4) excludes specified domestic listed-security and listed-derivative trading or valuation gains from those profits.
Premium-source distributions from eligible Korean domestic listed options can consequently be exempt in a general taxable account, while equity-dividend sources can be taxable.
The product’s domestic-equity label alone does not establish that every distribution is exempt.

The general-account withholding estimate is 15.4% of confirmed taxable distributions: 14% national tax plus 1.4% local tax.
Changing to a Korea-listed foreign-underlying product initially sets the taxable premium share to 100%, which still requires confirmation.
Foreign tax credits are not calculated automatically; the conditional after-tax model requires explicitly choosing a zero-credit assumption.
Do not add foreign tax again to a payout already net of that tax or treat 15.4% as the final liability for every product and investor.

Account settlement and spending access

Confirm the age-55 condition, account duration, pension withdrawal limit and applicable exceptions with the provider.
If other relevant private pension income plus the assumed full distribution withdrawal exceeds KRW 15 million per year, the age-rate after-tax estimate is withheld.
Comprehensive taxation, separate-tax elections, non-pension withdrawals, lifetime contracts and deferred retirement-income tax require separate review.
The wealth table deducts distribution-related taxes only and excludes ETF-sale tax, principal withdrawal and full-account settlement tax.
Different tax timing means the largest displayed amount is not an automatic account recommendation.

How to use the calculator

1. Enter the holding value and option coverage, then check strikes, roll frequency and fees in the product documents.
   
2. Separate premiums from dividends and choose cash holding or reinvestment.
   Start with cash holding if distributions are intended for living expenses.
   
3. Confirm the product type and taxable source percentages.
   Use pre-tax results until foreign tax-credit assumptions have been reviewed for foreign-underlying products.
   
4. Enter other financial income, the remaining ISA exemption and pension assumptions.
   Confirm when cash inside each account can actually be withdrawn.
   
5. Compare the three scenarios and inspect a selected monthly NAV and payout path.
   Optionally add twelve custom returns to explore the effect of recovery timing.
   
6. Save the assumptions and results as CSV or print them for a broker discussion.
   Account opening, buying, transfers and completed withdrawals must be checked separately.
   

KRW 100 million worked example: cash versus compounding

Assume KRW 100 million, 100% coverage, a 0% ATM strike, a monthly premium of 0.8%, and no dividends or fees in either ETF.
These are calculation examples, not actual product distribution disclosures.

The first-month distribution in the rising path is KRW 800,000.
A fully taxable source and zero foreign-credit assumption leave KRW 676,800 after general-account withholding; a confirmed exempt domestic listed-option source leaves KRW 800,000.
In the falling path, a −0.2% monthly return before distribution followed by a 0.8% payout reduces NAV by 1% each month.
After twelve months, ETF capital is KRW 88,638,487 and accumulated distributions are KRW 9,089,210; their sum remains below the original KRW 100 million.

Interpret results in a retirement budget

The general financial-income check adds this ETF’s taxable distributions to other relevant general interest and dividend income.
A total strictly above KRW 20 million triggers a comprehensive-tax review notice; exactly KRW 20 million does not trigger the model’s excess flag.
Exempt premium sources are excluded, and ISA or pension distributions are not added again as ordinary financial income.
Real tax classification and exceptions require review, so treat the notice as a prompt to investigate filing obligations.

Practical cautions and model limits

• The model repeats monthly calls with fixed coverage and strike distance.
  It does not replicate daily or weekly calls, target distributions, dynamic coverage, asset-index mismatches, exchange rates, volatility or tracking error.
  
• An attractive combination of premium and upside participation is not evidence that options can be sold at those terms.
  Overstated premiums can make every scenario look favorable; save a conservative alternative too.
  
• Each underlying price return must be between −100% and 100% per month.
  Do not enter an annual return as a monthly value or confuse twelve times a monthly return with compounded annual growth.
  
• Whole-KRW rounding is for display.
  Actual tax rounding, trading charges, sale tax, full account-wide netting, principal-withdrawal tax, health-insurance contributions and final comprehensive income tax are excluded.
  

Frequently asked questions

Official sources, verification and next steps