셈장부 | 1인사업자·프리랜서 장부

If you work alone, taxes can be the most daunting part.

Seomjangbu is a household ledger that estimates your tax liability in advance simply by recording your income and expenses, making it easier for freelancers and sole proprietors to track their tax burden. Don't panic and rush to calculate everything at once during filing season; prepare little by little in advance. 📒 Record in seconds, view at a glance

· Enter income and expenses with just a few taps

· Differentiate between business and personal use, and categorize all at once

· Analyze monthly, quarterly, and yearly trends and categories using calendars and statistics

🧮 Estimate your taxes in advance

· Comprehensive Income Tax — Estimate expected tax amount and refund/additional payment based on income and expenses

· Value Added Tax — Semi-annual (1st/2nd period) for general taxation, once a year for simplified taxation

· Estimates differently for freelancers (3.3% withholding tax) and sole proprietors (general/simplified)

🔁 Handle transitions and concurrent work correctly

· Whether you started as a freelancer and switched to a sole proprietorship, or earn income from both,

· Accurately calculate past and present separately by reflecting your tax status by period

🔔 Don't miss filing deadlines

· Notify you of Comprehensive Income Tax and VAT filing deadlines one week in advance

🧾 Deeper, More Convenient (PRO)

· Basis for calculating estimated taxes · Past View year/quarter · Organize expenses in detail

· Attach receipt photos to transactions for safekeeping

· Two-way integration with Notion — View and organize within the familiar Notion

💜 Pricing

· Free — Includes household ledger, statistics, and estimated tax summaries

· PRO (4,900 KRW/month · 39,000 KRW/year) — Detailed tax information, past year viewing, expense organization, Notion integration, and receipt attachment

👤 Suitable for:

· Freelancers such as designers, developers, writers, instructors, and photographers

· Sole proprietors in online shopping, food service, or service industries

· Those who have transitioned from freelance to business owner status or earn income from two sources

⚠️ The tax amounts in Semjangbu are estimates based on the information you enter. We recommend verifying the actual tax amount with Hometax or a tax professional.