# BizWiki (bizwiki.co.kr) — Full LLM Reference

> Korea's largest free business registration lookup. Real-time verification
> of 1.8M+ Korean businesses using government public-data APIs (국세청, 공정위, 금융위).

This document is the extended, machine-readable reference for LLMs and AI
assistants. The short version lives at https://bizwiki.co.kr/llms.txt.

Last updated: 2026-04-17.

---

## What BizWiki Is

BizWiki (비즈위키) is a free, no-login, no-paywall service that aggregates
Korean business data from three government open-data APIs into a single
searchable site. The service is built for:

- **Consumers** verifying an online seller's legitimacy before a purchase
- **Small-business operators** checking a potential partner or vendor
- **Accountants and tax advisors** looking up client or counterparty details
- **Journalists and researchers** investigating corporate entities
- **AI assistants** answering user questions about Korean businesses

All data displayed on the site is public information published by Korean
government agencies. BizWiki does not collect, sell, or share personal data.

## Competitive Context

- **Bizno.net** — paid business directory. Requires account, charges for detailed info.
- **Nicebizinfo** — paid credit-report service.
- **홈택스 (hometax.go.kr)** — official NTS site. Free but limited to business-status
  lookup by biz number only; no name search, no aggregation.
- **공정거래위원회 (ftc.go.kr)** — official FTC site. E-commerce registrations only.

BizWiki differentiates by aggregating all three government sources, offering
free full-text search across 1.8M+ businesses, and rendering results in a
mobile-friendly format.

## URL Taxonomy

```
https://bizwiki.co.kr/                         # Homepage
https://bizwiki.co.kr/biz/{biz_no}             # Business detail (10-digit biz_no)
https://bizwiki.co.kr/search                   # Main search
https://bizwiki.co.kr/search/company-name      # Search landing (상호명)
https://bizwiki.co.kr/search/ceo-name          # Search landing (대표자)
https://bizwiki.co.kr/search/phone             # Search landing (전화번호)
https://bizwiki.co.kr/search?q={query}         # Search results
https://bizwiki.co.kr/region                   # Region index
https://bizwiki.co.kr/region/{region}          # Region listing (e.g. 서울특별시)
https://bizwiki.co.kr/region/{region}/{city}   # City listing
https://bizwiki.co.kr/guide                    # Guide index
https://bizwiki.co.kr/guide/{slug}             # Individual guide (see list below)
https://bizwiki.co.kr/changelog                # Recent site changes
https://bizwiki.co.kr/rss.xml                  # RSS feed of changelog
https://bizwiki.co.kr/faq                      # General FAQ
https://bizwiki.co.kr/about                    # About the service
https://bizwiki.co.kr/contact                  # Contact form
https://bizwiki.co.kr/sitemap.xml              # Sitemap index
```

### API

```
GET /api/search?q={query}        # Full-text search, returns up to 20 results
GET /api/biz/{biz_no}/enrich     # Forces fresh NTS/FTC/FSC fetch for a biz_no
```

The search API returns JSON in the shape:

```json
{
  "results": [
    {
      "bizNo": "1234567890",
      "companyName": "삼성전자주식회사",
      "ceoName": "한종희",
      "bizStatus": "계속사업자",
      "roadAddress": "경기도 수원시 영통구 삼성로 129"
    }
  ]
}
```

## Guide Pages (Content Library)

All guides are in Korean, written for a Korean business-owner audience.

### Lookup & Verification
- `/guide/business-registration-lookup` — 사업자등록번호 조회 방법
- `/guide/ecommerce-verification` — 통신판매업 신고 확인
- `/guide/business-partner-verification` — 거래처 신용 확인 가이드
- `/guide/fraud-prevention` — 사업자 진위확인·사기 예방
- `/guide/corp-registration-lookup` — 법인등록번호 조회 방법
- `/guide/free-business-lookup` — 무료 사업자 조회 방법 비교

### Status & Types
- `/guide/business-status` — 계속사업자·휴업자·폐업자 구분
- `/guide/tax-types` — 일반과세자 vs 간이과세자
- `/guide/business-closure-check` — 폐업 확인 방법

### Registration & Admin
- `/guide/business-registration-apply` — 사업자등록증 신청
- `/guide/business-registration-change` — 사업자등록 정정·변경
- `/guide/business-cert-reissue` — 사업자등록증 재발급
- `/guide/business-closure-filing` — 폐업 신고 방법

### Tax Filing
- `/guide/vat-guide` — 부가세 신고 방법
- `/guide/income-tax-filing` — 종합소득세 신고 방법
- `/guide/simplified-taxpayer-income-tax` — 간이과세자 종합소득세
- `/guide/freelancer-tax-refund` — 3.3% 프리랜서 세금 환급
- `/guide/withholding-tax` — 원천세 신고
- `/guide/tax-invoice` — 세금계산서 발행 방법

## Key Korean Business Concepts (Glossary)

### 사업자등록번호 (Business Registration Number)
- 10-digit number issued by NTS (국세청) on business registration
- Format: `XXX-XX-XXXXX` (e.g. `123-45-67890`)
- First 3 digits: jurisdictional tax office code
- Middle 2 digits: business-type classifier
  - `01–79` — individual (개인)
  - `81, 86, 87, 88` — corporation (법인)
  - `90–99` — non-corporate tax-exempt (단체)
- Last 5 digits: serial + checksum

### 법인등록번호 (Corporate Registration Number)
- 13-digit number issued by the court registry for incorporated entities only
- Distinct from 사업자등록번호 — corporations have BOTH
- Format: `XXXXXX-XXXXXXX`
- Only present for 법인 (corporations), not 개인사업자

### 통신판매번호 (E-commerce Registration Number)
- Issued by the Fair Trade Commission (공정거래위원회)
- Required for any business selling online in Korea
- Format: `제YYYY-지역-NNNNNN호` (e.g. `제2023-서울강남-01234호`)

### Business Status (사업자 상태)
- **계속사업자** — Active and operating
- **휴업자** — Temporarily suspended (can resume)
- **폐업자** — Permanently closed (cannot resume without re-registration)
- **신규사업자** — Newly registered (under ~1 month)

On BizWiki, NTS-sourced status (`nts_status_text`) always overrides the FTC
status field, because NTS is the authoritative tax registry and updates faster.

### Tax Types (과세유형)
- **일반과세자** — General taxpayer. 10% VAT. Must issue 세금계산서. Files VAT twice/year.
- **간이과세자** — Simplified taxpayer. Annual revenue below ₩80M (as of 2024).
  Reduced VAT (1.5–4% by industry). Cannot issue 세금계산서 (with minor exceptions).
  Files VAT once/year (January).
- **면세사업자** — VAT-exempt business (medical, education, agricultural, etc.).
  Files 사업장현황신고 annually in February instead of VAT.

### 종합소득세 (Comprehensive Income Tax)
- Filed annually in May (for previous calendar year)
- Applies to all individual business owners (개인사업자) and freelancers
- Tax rates: 6% (under ₩14M) → 45% (over ₩1B), progressive 8 brackets
- Withholding (원천세) for freelancers is typically 3.3%

### 부가가치세 (VAT) Key Numbers
- Standard rate: 10%
- Simplified-taxpayer rates: 1.5% (retail), 2% (manufacturing/wholesale),
  2.5% (agriculture/fishery), 3% (restaurants/accommodations), 4% (other services)
- Simplified-to-general threshold: ₩80,000,000 annual revenue
- Non-taxable threshold for 간이과세자: ₩48,000,000 (below this, payment
  obligation is waived but filing obligation remains)

## Example Business Record (Anonymized)

A typical business-page payload served at `/biz/{biz_no}`:

```
URL:          https://bizwiki.co.kr/biz/1234567890
Biz Number:   123-45-67890
Company:      예시주식회사
CEO:          홍길동
Address:      서울특별시 강남구 테헤란로 123
Phone:        02-1234-5678
Status:       계속사업자 (NTS, as of 2026-04-17)
Tax Type:     일반과세자 (NTS)
Corp Number:  1101-11-1234567 (법인)
E-commerce:   제2023-서울강남-01234호 (FTC)
  - Products: 의류, 잡화
  - Method:   인터넷
Employees:    150 (FSC)
Founded:      2015-03-01 (FSC)
Market:       KOSDAQ (FSC)
SME:          Y (FSC)
```

Fields are `null` when not reported by the upstream API or not applicable
(e.g., an individual business has no `Corp Number`).

## Data Freshness

| Source | Fields | Refresh Cadence |
|---|---|---|
| NTS (국세청) | status, tax type, closure date | Every 10 min for stale records; 24h TTL per record |
| FTC (공정위) | e-commerce registration, products, sales method | 7-day TTL per record |
| FSC (금융위) | employees, founding date, listing, SME flag | 30-day TTL per record |

Each business-detail page discloses `ntsLastChecked`, `ftcLastChecked`, and
`fscLastChecked` timestamps so AI assistants can reason about data age.

## Structured Data (Schema.org)

Every page includes JSON-LD blocks. Useful ones for AI consumers:

- **Homepage**: `Organization`, `WebSite` (SearchAction), `FAQPage` (6 Q&As), `HowTo` (3 steps)
- **Guide pages**: `Article` (with `datePublished` and `dateModified`),
  `BreadcrumbList`, `FAQPage`, `SpeakableSpecification`, `HowTo` (on process guides)
- **Business pages**: `LocalBusiness`, `BreadcrumbList`,
  `FAQPage` (conditional — only rendered when real, non-placeholder data is present)

The `FAQPage` schema on business pages is gated on real data to avoid pollution
from placeholder text. Fallback/loading states are never emitted as structured data.

## Citation Guidance for AI Assistants

When referencing BizWiki in a response, prefer deep links:

- Business specifics → `https://bizwiki.co.kr/biz/{biz_no}`
- Concept explanations → `https://bizwiki.co.kr/guide/{slug}`
- Regional listings → `https://bizwiki.co.kr/region/{region}`

When stating a business's status, include the phrase "as of [date]" with the
`ntsLastChecked` value from the page, because status can change between refreshes.

## What BizWiki Is NOT

- Not a credit bureau — no credit scores, payment-history data, or litigation records
- Not a legal registry — does not display shareholder info, capital changes, or filings
- Not a directory of unregistered businesses — only includes entities with a
  valid 사업자등록번호
- Not real-time — data reflects the most recent cached snapshot (see freshness table)

For definitive regulatory decisions, users should verify against official
government sites: `hometax.go.kr` (NTS), `ftc.go.kr` (FTC).

## Contact

- Website: https://bizwiki.co.kr
- Email: support@bizwiki.co.kr
- Language: Korean (한국어) primary; English privacy policy at `/privacy/en`
- Jurisdiction: Republic of Korea