We find your hidden money to the very end!
From comprehensive income tax refunds and medical expense refunds to the Hometown Love Donation System, telecommunication subsidies, and even app-based money-making strategies,
Claim every single penny you were missing out on because you didn't know about it with Samjeomssam.
● What kind of service is Samjeomssam?
- We provide comprehensive income tax filing assistance services so you can claim your hidden refunds.
- Samjeomssam's partner tax accountants assist business owners with their regular comprehensive income tax filings.
Samjeomssam's tax-related services focus on tax saving by offering tax information search, refund calculations for the past five years, and refund filing assistance.
Anyone can use our services quickly and conveniently to handle difficult and complex tax filings.
(This service does not include tax consultations or tax agency services provided by professionals such as tax accountants.)
● What features does Samjeomssam offer?
- We deliver ‘Jjeom, Money-Making Stories,’ covering everything from tax tips to questions about Samjeomssam. - Check your income and tax history for the past 5 years with the ‘Income Certificate.’
- With ‘Medical Expense Refund,’ anyone with indemnity medical insurance can receive a refund for medical expenses.
- Start your day with ‘Daily Missions’ in the Benefits tab. Points can be used to purchase gift certificates.
In addition to easy tax filing assistance, Samjeomssam provides personalized financial and tax-saving information useful for daily life. Download the Samjeomssam app now to utilize the various additional features available only through the app. We will help you apply what you learn immediately to your real life!
● Is Samjeomssam a trustworthy place?
Samjeomssam is a service operated by Jarvis & Villains Co., Ltd., a tax tech company established in 2015. It is Korea’s leading tax filing and refund assistance service, chosen by 24 million cumulative subscribers.
Minimum personal information is collected for service usage, is encrypted and securely stored in accordance with relevant laws, and is immediately destroyed after the necessary purpose has been achieved. The 3o3 system protects your information through a thorough and secure security management system. Having received official recognition for its safety and reliability, it has obtained the Information Security Management System (ISMS) certification administered by the Korea Internet & Security Agency (KISA).
● Do you have any inquiries?
Please leave an inquiry via the ‘Customer Center’ in the app or the KakaoTalk Plus Friend ‘3o3 Customer Center’.
● 3o3 Official Sites & SNS
Website : https://www.3o3.co.kr/
YouTube : https://bit.ly/3HiR8iF
Instagram : https://www.instagram.com/3o3_official/
Blog : https://blog.naver.com/jobisnv
※ Notice regarding feature restrictions during maintenance
Some functions, such as checking your initial refund, may not work if you sign up during the Hometax maintenance hours (daily 00:00–09:00). You can continue from where you left off by using the app again after the maintenance period.
※ Service Permission Access Guide
[Essential Access Permissions]
- Search Installed Apps: Detecting malicious apps to prevent personal information leakage incidents
* You cannot use Samjeomssam if a malicious app is installed.
[Optional Access Permissions]
- Camera: Using the service, such as taking photos/videos necessary for consultations, photographing ID cards for medical expense refunds, and capturing palm lines to provide event benefits
- Storage: Attaching photos and files stored on the device
- Notifications: Receiving notifications necessary for service use
- Physical Activity (Motion & Fitness): Recording physical activities such as pedometers
* You can change access permissions in the OS Settings app, and you can use Samjeomssam even if you do not agree to the optional access permissions.
- How to revoke optional access permissions: Settings > View All Apps > Samjeomssam > App Permissions > Allow/Disallow Access Permission Item
※ 288,635 KRW is the average application amount per person based on the total refund applications of 7,208,747 cumulative reporting customers during the period from May 1, 2020 to April 1, 2026. ※ 414,000 KRW is the average refund application amount per person for 155,658 cumulative applicants from July 2025 to February 2026.
※ As of May 1, 2020 to April 1, 2026, there are 13,965,129 eligible customers out of 19,518,109 refund inquiry users, representing 71%.
※ The existence of a refund and the estimated refund amount may vary depending on individual conditions (personal details, eligibility for deduction items and their application, etc.).