io.github.yuli3/oiyo-calculations

up checked 2026-11-11T15:37:19.943Z

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Publisher-provided title

OIYO Korea Calculators

Publisher-provided description

Korean personal tax, payroll, labor, real estate and calendar calculators. Code, no LLM.

Summary by lookupd

Computes South Korean tax, payroll, labor, real estate, and calendar figures such as income tax, severance, holidays, and unit conversions.

Install

Claude Code, remote (streamable-http)

claude mcp add --transport http oiyo-calculations https://api.oiyo.net/mcp

Codex, remote (streamable-http)

codex mcp add oiyo-calculations --url https://api.oiyo.net/mcp

Cursor, remote (streamable-http) → .cursor/mcp.json

{
  "mcpServers": {
    "oiyo-calculations": {
      "url": "https://api.oiyo.net/mcp"
    }
  }
}

Other clients: docs. Or tell your agent: Set up lookupd for me: read https://lookupd.com/agent.md and follow it.

Tools (26 tools)

Publisher-provided text

• get_kr_minimum_wage Verified Korean minimum wage by year, effective dates and 8/209-hour examples. Not a 2027 net-salary calculator; uncollected insurance is unavailable.
• get_kr_holidays Get official South Korea public holidays, substitute holidays, and solar terms for a given year.
• check_kr_business_day Determines if a given date is a South Korea working business day or a public holiday/weekend.
• calculate_saju_astrology Computes traditional Korean Sexagenary Cycle (60 Gapja) Four Pillars and Five Elements (오행) balance from birth datetime and solar/lunar calendar.
• calculate_unemployment_benefits Simulates statutory South Korean unemployment benefits (실업급여) duration, daily benefit rate, and total expected payout.
• calculate_weekly_allowance Calculates statutory South Korean weekly holiday allowance (주휴수당) for part-time and hourly workers.
• calculate_overtime_pay Calculates statutory overtime, night, and holiday allowances under Korean Labor Standards Act.
• calculate_net_salary Calculates net monthly take-home salary after the 4 major social insurances (2026 statutory rates) and an ESTIMATED income tax (annualized estimate, not the NTS
• calculate_severance_pay South Korean statutory severance arithmetic. Unknown or mixed four-week hours return null eligibility and amount; all-period self-confirmation is required for a
• calculate_annual_leave Calculates statutory annual paid leave days (연차 휴가) and unused leave cash-out allowance by years of service.
• calculate_military_service Calculates South Korea mandatory military service duration, completion rate, remaining days, and rank promotion dates.
• calculate_gas_bill Calculates South Korea residential city gas invoice amount based on cubic meters used and heating/cooking tariff.
• convert_units Universal deterministic unit conversion for area (pyeong ↔ m², sqft, ha), length, mass, and temperature.
• calculate_cagr Calculates Compound Annual Growth Rate (CAGR, 연평균 복합 성장률), total ROI, and Rule of 72 milestone.
• calculate_compound_interest Simulates compound interest growth with initial principal, annual yield, recurring monthly contributions, and annual balance trajectory.
• calculate_health_insurance Calculates Korean regional insurance premiums and preliminary income/property flags only. dependentEligibility.isEligible is null: family support, spouse/siblin
• diagnose_hug_guarantee Diagnoses HUG Jeonse Deposit Return Guarantee eligibility (126% rule, 60% senior debt limit, 90% debt ratio limit) and calculates statutory guarantee fee.
• calculate_capital_gains_tax Calculates South Korea Real Estate Capital Gains Tax with 1-home 1.2 billion KRW exemption, high-value house apportionment, and up to 80% special long-term hold
• compare_vat_tax Compares South Korea Value-Added Tax (VAT) between General Taxpayer (10% with full deduction/refund) and Simplified Taxpayer (15-40% value-added rate, 48M exemp
• calculate_inheritance_gift_tax Calculates South Korea 2026 statutory inheritance and gift tax, progressive tax brackets (10-50%), relationship deductions, and voluntary filing discount.
• calculate_loan_refinance Calculates loan refinancing savings, prepayment penalty fees with 3-year sliding taper, and break-even point in months.
• calculate_card_tax_deduction Calculates South Korea 2026 year-end card tax deduction, 25% threshold, credit (15%) vs check (30%) rates, and golden ratio strategy.
• calculate_kr_year_end_settlement South Korea 2026 귀속 year-end tax settlement (연말정산) for a resident wage earner: income deductions, card deduction, special deductions/credits vs the 130,000 KRW
• calculate_kr_freelancer_income_tax South Korea freelancer (3.3% withholding, 사업소득) May comprehensive income tax estimate: simple expense rate 940909 (64.1%, 49.7% above 40M KRW) or a given expens
• calculate_kr_acquisition_tax South Korea 2026 housing acquisition tax (주택 취득세) with local education tax and rural special tax: 1-3% standard rate (6-900M KRW sliding formula) or 8%/12% mult
• calculate_kr_property_tax South Korea 2026 housing property tax (주택 재산세) from the official price: fair market value ratio (43-45% for one-home households, 60% otherwise), one-home specia

Details

• Version: 1.3.1
• Transports: streamable-http
• Uptime (7 days): 100%
• Median latency: 388 ms
• First indexed: 2026-11-09T13:17:26.401Z
• Last seen in registry: 2026-11-10T12:17:23.624Z
• Repository: https://github.com/yuli3/api-oiyo
• Website: https://api.oiyo.net/docs

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• Last crawl: 2026-11-11T17:38:11.606Z
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