사장님 세무캘린더 - 부가세 종합소득세 알림

※ This app is not an official government app.

The Boss Tax Calendar is an unofficial schedule guidance utility created by an individual developer. It is not affiliated with, sponsored by, or linked to any government agency, such as the National Tax Service, the Ministry of the Interior and Safety, or the National Health Insurance Service, and does not represent any government agency or act as an agent for government services. It does not provide tax consultation, filing assistance, or integration with Hometax.

■ Information Sources (Official Government Agencies)

The filing and payment deadlines and tax information provided by this app are based on data released by the official agencies listed below. You can navigate directly to the relevant source pages from the schedule details screen within the app.

- National Tax Service: https://www.nts.go.kr

- National Tax Service Hometax (Electronic Filing & Payment): https://hometax.go.kr

- Wetax (Local Taxes): https://www.wetax.go.kr

- 4 Major Social Insurance Information Linkage Center: https://www.4insure.or.kr

Actual filing and payment deadlines and tax amounts may vary depending on the industry, tax type, and individual circumstances. Please be sure to verify this through the official websites above or a tax professional.

Have you ever paid a penalty for forgetting to file your VAT return?

Notifications from Hometax and the National Secretary often include guidance that is irrelevant to your business type. You have to look up the actual deadlines you need to keep track of yourself. The Boss Tax Calendar was designed to do the opposite. Without any registration or verification, simply select your business type, and it will notify you in advance of the deadlines that apply to you.

■ Setup Complete in Just 30 Seconds

Simply select one of the following: Simplified Taxpayer / General Taxpayer / Corporation / Freelancer (3.3%) / Tax-Exempt Business, and check whether you have employees. That is it. There is no sign-up, identity verification, or business registration number input required. The selected information is not sent to a server but is stored only on your mobile phone.

■ Deadlines Applicable to Your Type

- Value Added Tax (VAT) Provisional/Final Return (1st/2nd Period)

- Comprehensive Income Tax (including diligent reporting)

- Withholding Tax Filing/Payment (including semi-annual payers)

- Corporate Tax and Interim Prepayment

- Business Location Status Report (Tax-Exempt Businesses)

- Submission of Payment Statements, Reporting of Total Remuneration for the Four Major Insurances, Year-End Tax Settlement

- Local Taxes: Resident Tax (Business Location/Employee Portion), Individual Local Income Tax, Special Collection of Local Income Tax

- Selectable Items: Property Tax (Self-Owned Business Location), Registration and License Tax (License/Permit Industry)

Schedules that do not apply will not be displayed at all. Past schedules are also automatically organized.

■ Reflects Weekend and Holiday Postponements

If a deadline falls on a Saturday or a public holiday, the actual deadline is pushed back to the next business day. This app displays the finalized date reflecting this postponement. For example, since July 25th falls on a Saturday for the 2026 first quarter VAT final return, the actual deadline is July 27th (Monday). If a temporary public holiday is designated or the National Tax Service extends the deadline, only the schedule data is updated and reflected without requiring an app update.

■ D-7 / D-3 / D-1 Push Notifications

You will be notified 7, 3, or 1 day before each deadline. You can turn notifications on or off in stages and customize the receiving times as desired. A test function has also been added to the settings to allow you to immediately verify that notifications are being received correctly.

■ 4 Types of Tax Calculators (Offline Operation)

- Value Added Tax (VAT): Tax payable (or refundable) based on sales/purchase supply prices

- Comprehensive Income Tax: Tax calculated based on tax base + Individual Local Income Tax

- Four Major Social Insurances: Employee deductions based on monthly remuneration

- Withholding Tax 3.3%: Total of actual payment and withholding tax

The amounts entered are neither saved nor transmitted anywhere.

■ Preparation Checklist

We have organized "what needs to be taken care of" for each schedule. For VAT, this includes aggregating sales/purchase tax invoices, verifying credit card/cash receipt sales, and checking for missing electronic tax invoices. Each schedule screen includes a link that leads directly to the official guidance pages of the National Tax Service (https://www.nts.go.kr) and Wetax (https://www.wetax.go.kr), which serve as the basis for the information.

■ Home Screen Widget

You can check the D-days for the next three deadlines directly on the home screen.

■ Dark Mode · Tablet Support

You can follow system settings or fix it to Light/Dark mode. The layout adjusts to fit the screen size, not only on phones but also on tablets and unfolded foldable screens.

■ Recommended for:

- Sole proprietors filing directly without a tax accountant

- Start-ups in their first or second year who are afraid of penalties because they are unaware of deadlines

- Small business owners with 1 to 4 employees who must manage withholding tax and the four major social insurances

- Freelancers subject to the 3.3% withholding tax

■ What We Do Not Do

We do not provide tax filing services, integrate with Hometax, input ledgers or sales data, or perform identity verification. Therefore, we do not request personal information.

■ Notice and Disclaimer

This app is an unofficial app not affiliated with any government agency and does not represent any government agency. The schedules and calculation results provided are for general guidance and reference only. Actual filing and payment deadlines and tax amounts may vary depending on the industry, tax type, and individual circumstances, so please be sure to verify this through the official sources below or a tax professional.

■ - National Tax Service: https://www.nts.go.kr

- National Tax Service Hometax: https://hometax.go.kr

- Wetax (Local Taxes): https://www.wetax.go.kr

- 4 Major Social Insurance Information Linkage Center: https://www.4insure.or.kr

Privacy Policy: https://leeedaebok.github.io/privacy-policies/semucalendar/
Inquiries: leeedaebok@gmail.com