Derivation Chain
Step 1
Surge in interest in lottery round 1213 winnings
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Step 2
Questions about taxes and receipt methods upon winning the lottery
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Step 3
Simulation of cascading changes in pension, health insurance premiums, and comprehensive income tax after receiving winnings
Problem
When lottery buyers in their 50s-60s win (or plan assuming a win), it is extremely difficult to accurately calculate the after-tax net amount, as well as the impact of the winnings on the following year's comprehensive income tax, health insurance premiums, and National Pension. Especially for retirees, regional health insurance premiums can surge to 500,000-1,000,000 KRW (approx. $375-$750) per month due to the inclusion of winnings as income, but almost no one is aware of this in advance. Without consulting a tax accountant, it's impossible to decide the optimal receipt strategy (lump sum vs. annuity-style installment), effectively blocking access to free information.
Solution
Users enter the winning tier and prize amount on the web, and the service instantly calculates the net amount after income tax and local income tax, and simulates the following year's changes in health insurance premiums, shifts in comprehensive income tax brackets, and impact on Basic Pension eligibility. It also provides a comparison of after-tax net assets under scenarios of lump-sum receipt vs. diversified investment in financial products.