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LearnFrom basic terms to charts and indicators, step by step
Stock TextbookIn-depth chapters on market rules, filings, financials and US market structure
Mock TradingPractice on random charts and take on 40 real-world stages
US Market CalendarCPI, FOMC and Big Tech earnings in your time zone
My TradesTurn your buys and sells into returns and period P&L
Stock CalculatorsAverage cost, returns, dividends and tax
Everyday CalculatorsSalary, loans, severance, rent and dates (Korean rules)
GuidesPlain explanations of the numbers
AboutAbout, privacy policy and contact
GuidesGuides
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Money Guides

Knowing the principles behind the numbers leads to better choices. Articles to read alongside the calculators, based on Korean rules.

  • Read alongside the calculators
PayKorea’s four social insurances at a glance

What the national pension, health insurance, employment insurance and industrial accident insurance each cover, and how much you pay in 2026.

TaxYear-end tax settlement basics

The difference between income deductions and tax credits, card spending, pension savings and rent deductions, and practical tips to get more back.

LoansChoosing a loan repayment method

Equal payment vs equal principal, fixed vs variable rates, prepayment fees and DSR — what to know before you borrow.

StocksBefore you average down

Does lowering your average cost really cut losses? The effect and the illusion, a checklist before buying more, and how to plan staged buying.

RetirementSeverance pay vs retirement pensions

How severance pay, DB, DC and IRP differ, which suits you, and how to reduce retirement income tax.

HousingJeonse vs monthly rent: which is better?

Comparing housing costs including opportunity cost, and a before-and-after-signing checklist to avoid jeonse fraud.