Seoul STAX App: A Complete Guide to Paying Seoul Taxes Online
- FLip Korea
- 2 hours ago
- 11 min read
Living in Seoul comes with many conveniences, but dealing with Korean taxes can sometimes feel confusing, especially if you are a foreign resident.
The good news is that Seoul has an official mobile tax payment app called STAX (서울시 세금납부). It allows residents to check and pay various Seoul municipal taxes and other bills directly from their smartphone.
In this guide, we explain what the Seoul STAX app is, what you can pay through it, how it works, and what foreigners living in Seoul should know.
What Is the Seoul STAX App?
STAX is Seoul Metropolitan Government's official mobile tax payment service.
The name comes from Seoul Tax, and the app is designed to make paying local taxes and other municipal charges easier without visiting a bank or district office.
STAX can be used to check and pay:
Local taxes
Property tax
Automobile tax
Resident tax
Acquisition tax
Registration and license tax
Local income tax
Various non-tax revenues
Fines and administrative charges
Water and sewage charges
Seoul's official ETAX FAQ confirms that ETAX and STAX provide services for checking and paying Seoul local taxes, non-tax revenue, and water and sewage charges.
STAX vs. Seoul ETAX: What's the Difference?
If you have searched for information about paying taxes in Seoul, you may have come across both ETAX and STAX.
They are essentially two ways of accessing Seoul's tax payment services.
ETAX is the online website.
STAX is the mobile application.
The official Seoul ETAX website provides online tax payment services, while STAX allows you to access similar services through your smartphone.
For foreigners, this means you can choose whichever method is more convenient for you.
Seoul ETAX
Best if you prefer using a computer or browser.
Seoul STAX
Best if you want to check or pay your Seoul taxes directly from your phone.
Search "서울시 세금납부" or "STAX" in your app store.
What Taxes Can You Pay Through STAX?
One of the biggest advantages of STAX is that you can deal with several types of Seoul municipal payments in one place.
Depending on your situation, this can include:
1. Property Tax
If you own property in Seoul, you may need to pay local property tax.
STAX can be used to check and pay eligible property tax bills.
2. Automobile Tax
If you own a vehicle in Seoul, automobile tax is another important local tax.
Seoul has specifically advised foreign vehicle owners that automobile tax can be paid through Seoul ETAX or the STAX mobile app.
3. Resident Tax
Resident tax is another payment that many foreigners living in Korea encounter.
For example, Seoul's 2026 resident tax payment period runs from August 1 to August 31, 2026, and Seoul lists both ETAX and STAX as payment options.
4. Other Local Taxes
Depending on your circumstances, STAX can also be used for other local taxes such as acquisition tax, registration and license tax, and local income tax.
The official STAX app information lists local taxes including acquisition tax, local income tax, leisure tax, resident tax, automobile tax, property tax, and registration/license tax.
5. Non-Tax Revenue and Other Charges
STAX isn't limited to traditional taxes.
The service can also handle certain non-tax revenues, including administrative fines, usage fees, and other charges.
Water and sewage charges can also be paid through the system.
How to Use the Seoul STAX App
Using STAX may look intimidating at first because the service is designed primarily for Korea's tax system.
However, the basic process is fairly straightforward.
Step 1: Download STAX
Open the App Store or Google Play Store and search for:
서울시 세금납부
You can also search for:
STAX
Make sure you download the official Seoul tax payment application.
The official Seoul ETAX website specifically directs users to search for "서울시 세금납부" or "STAX" in the Play Store or App Store.
Step 2: Open the App
After installing the application, open STAX.
Depending on the service you want to use, you may be asked to authenticate yourself or enter information from your tax notice.
STAX supports several ways of identifying a payment, including an electronic payment number, tax payment number, QR/barcode information, and customer number.
Step 3: Find Your Tax Bill
If you have received a paper tax notice, look for the relevant payment information.
You may be able to search for the bill using the information provided on your notice.
For some payments, you can also use the QR code or electronic payment number.
Step 4: Choose Your Payment Method
STAX supports several payment options.
These include:
Bank account transfer
Credit card
Various Korean mobile payment services
Other supported easy-payment methods
The official Seoul ETAX information lists services such as Kakao Pay, Payco, SSGPAY, Naver Pay, Samsung Pay, L Pay, Toss Pay, and supported app cards.
Step 5: Confirm Your Payment
Before completing the transaction, check the amount and payment information carefully.
Once the payment has been completed, keep the confirmation for your records.
Can Foreigners Use the Seoul STAX App?
Yes, foreigners living in Seoul can encounter and use Seoul's local tax payment system when they have applicable tax obligations.
However, your ability to access particular services can depend on your identification and the type of tax or payment involved.
For example, Seoul provides dedicated information for foreign residents regarding taxes such as automobile tax.
If you are having trouble using the Korean-language app, you can also use Seoul ETAX's English website, which provides English information about tax payments and services.
Is STAX Available in English?
This is one of the most important things for foreigners to know.
The STAX app is primarily a Korean tax-payment application, so the experience may not be as foreigner-friendly as international banking apps.
The current App Store listing identifies English as an available app language, but some users may still find that parts of the Korean tax system and terminology require additional explanation.
If you are not comfortable navigating Korean tax terminology, the English Seoul ETAX website can be useful for understanding the system before making a payment.
What Payment Methods Does STAX Accept?
STAX currently supports multiple payment methods.
According to Seoul's official payment information, users can pay through:
Bank transfer
You can use an eligible Korean bank account through the supported payment system.
Credit card
Credit card payments are supported for eligible taxes and charges.
Easy payment services
Depending on the device and service, supported options include popular Korean payment platforms such as Kakao Pay, Naver Pay, Toss Pay, Samsung Pay, Payco and others.
This can be particularly convenient if you already use Korean mobile payment services in your daily life.
How Much Time Do You Have to Pay?
The deadline depends entirely on the type of tax.
There isn't one universal STAX payment deadline.
For example, Seoul's 2026 resident tax payment period is August 1-31, 2026.
Automobile tax has different payment periods, while property tax also follows its own schedule.
This is why you should always check the payment deadline shown on your tax notice rather than assuming that all Seoul taxes are due at the same time.
Why STAX Is Useful for Foreign Residents
For foreigners living in Seoul, STAX can be especially useful because it reduces the need to visit a bank or government office simply to pay a bill.
You can pay from your phone
You don't need to find a bank branch just to make a payment.
You can use Korean payment methods
If you already have a Korean bank account or Korean credit card, STAX can make the payment process more convenient.
You can check different municipal payments
Instead of dealing with every payment separately, Seoul's tax system brings many local taxes and charges into one service.
It can help you avoid missed deadlines
Tax notices are easy to forget, especially if you move frequently or don't regularly check Korean mail.
Checking your tax information online can make it easier to stay organized.
STAX vs. ETAX: Which Should You Use?
Feature | STAX | ETAX |
Platform | Mobile app | Website |
Smartphone friendly | Yes | Yes |
Computer friendly | No | Yes |
Local tax payments | Yes | Yes |
Credit card payment | Yes | Yes |
Bank transfer | Yes | Yes |
Easy payment | Yes | Yes |
Best for | Paying on your phone | Managing taxes online |
Both services are part of Seoul's official tax payment system.
If you prefer apps, use STAX.
If you want a browser-based service or need English information, Seoul ETAX may be easier.
How to Create a STAX Account
You don't necessarily need to create an account every time you want to pay a Seoul tax, but having a STAX/ETAX account can make things much easier if you regularly live in Seoul.
With an account, you can check your tax notices and payment history more conveniently, including situations where you don't have the paper bill in front of you. Seoul's ETAX explains that registered members can check notices, payment history, and other services without having to rely on the physical bill.
Option 1: Create Your Account Directly Through STAX
Download and open the 서울시 세금납부 (STAX) app.
Look for the 회원가입 (Sign Up / Create Account) option.
STAX allows individuals and individual business owners to register. Seoul's official FAQ confirms that membership registration is available through both ETAX and STAX.
The exact screens can change when the app is updated, but the general process is:
Open STAX.
Select 회원가입 (Sign Up).
Select the appropriate membership type.
Agree to the terms and privacy information.
Enter your required personal information.
Complete the required identity/authentication process.
Finish the registration.
Log in and connect the account with the available authentication method.
Important for Foreigners
This is where things can become a little confusing.
Korean government tax services are built around Korean identification and authentication systems, so having an ARC does not automatically mean that every registration or authentication method will work exactly like it does for a Korean citizen.
If STAX registration doesn't work for you, don't assume that you cannot pay your tax.
Try the Seoul ETAX website instead, or use the payment information printed on your tax notice.
Seoul's current ETAX login system supports several authentication methods, including joint/financial certificates, private-sector simple authentication, QR/mobile-phone authentication, and STAX-related mobile authentication.
Option 2: Create an ETAX Account
If using the app is difficult, you can create an account through the official Seoul ETAX website.
Go to:
Select Create Account.
For individual users, Seoul currently provides different registration options and authentication methods. The official ETAX guide says individual members can use methods including a joint certificate, financial certificate, mobile-phone authentication, or mobile simple authentication, depending on the available service.
After registration, you can use your account to check notices and payment history without manually entering the long payment number every time.
How to Search for Your Tax in STAX
This is probably the most useful part if you've just received a tax notice.
You don't always have to know exactly which tax you are looking for.
There are several ways to find a payment in Seoul's system.
Method 1: Check Your Bills After Logging In
After logging into STAX, look for the section related to:
조회/납부
This means Inquiry / Payment.
From there, you can look for your outstanding taxes or bills.
For registered members, Seoul's system can retrieve applicable local taxes associated with your account, meaning you don't necessarily need to manually enter the entire electronic payment number.
This is especially convenient if you have misplaced the paper bill.
Method 2: Search Using the Payment Number
If you have your physical tax notice, look for the payment identification information.
Depending on the type of bill, Seoul's system provides different search/payment options, including:
Tax payment number
Electronic payment number
Simple payment number
Customer number
QR code/barcode
The official ETAX system lists these as different payment/search methods.
If you are unsure which number to use, the safest option is to follow the label printed next to the number on your tax notice rather than randomly entering numbers.
Method 3: Scan the QR Code
Some Seoul tax notices include a QR code.
If your STAX app provides the QR/payment scanning option, you can use your phone's camera to scan the code and proceed to the payment information.
This can be much easier than typing a long payment number manually.
Method 4: Search Your Payment History
Already paid a tax but want to check whether the payment went through?
Look for the section related to 납부내역, meaning payment history.
This is one of the advantages of having an account: Seoul's ETAX system allows members to check previous payment records and receipts online.
What If You Don't Have a Tax Bill?
Don't panic.
If you are registered with Seoul ETAX/STAX, you may be able to check your outstanding local taxes through your account.
Seoul specifically states that registered users can check their tax notices without having the physical bill and can access their payment history online.
If nothing appears, however, that doesn't automatically mean you don't owe anything.
The tax may not yet have been issued, you may be looking in the wrong section, or your authentication/account information may not be connected correctly.
If you're unsure, contact Seoul ETAX customer service or your local district office.
Can You Use STAX If You Live Outside Seoul?
No.
This is a very important distinction.
STAX and Seoul ETAX are Seoul's local tax payment services.
If you live in Busan, Daegu, Incheon, Daejeon, Gwangju, Jeju, Gyeonggi-do, or another region, you should not assume that STAX will show your local taxes.
Seoul's official FAQ explicitly states that ETAX/STAX are for Seoul local taxes and cannot be used to pay local taxes from other regions. For other regions, Seoul directs users to Wetax (위택스).
What Is Wetax?
Wetax (위택스) is the nationwide local tax service used for local taxes outside Seoul.
Think of it this way:
Seoul → STAX / Seoul ETAX
Other regions → Wetax
This is one of the easiest ways to remember the difference.
If your tax notice is from a local government outside Seoul, look for 위택스 (Wetax) rather than trying to use STAX.
The important thing is not necessarily which city you are originally from or where you are registered nationally. Look at which local government issued the tax.
STAX vs. Wetax: Quick Comparison
STAX / Seoul ETAX | Wetax | |
Main area | Seoul | Nationwide local taxes outside Seoul |
Seoul local taxes | Yes | Not the main Seoul system |
Busan local taxes | No | Yes |
Incheon local taxes | No | Yes |
Gyeonggi-do local taxes | No | Yes |
Daegu local taxes | No | Yes |
Daejeon local taxes | No | Yes |
Jeju local taxes | No | Yes |
Mobile access | STAX | Wetax mobile/web services |
Main Korean name | 서울시 세금납부 / 서울시 ETAX | 위택스 |
How to Know Which Tax Service You Need
If you're a foreigner and you receive a Korean tax notice, don't immediately download five different apps.
First, check the issuing local government.
If it says 서울특별시 (Seoul Metropolitan Government) or is clearly a Seoul local tax:
→ STAX / Seoul ETAX
If it is from another city, county, or province:
→ Wetax
If it is a national tax, such as certain national income-tax matters:
→ You may need the National Tax Service (Hometax) rather than either STAX or Wetax.
This distinction is important because Korea has both national taxes and local taxes, and they are handled through different systems.
Important Things Foreigners Should Know
1. STAX Is for Seoul Municipal Payments
STAX is specifically connected to Seoul's local tax and municipal payment system.
It is not the same thing as the Korean National Tax Service's Hometax.
If you need to deal with national taxes such as certain income tax matters, you may need to use a different government service.
2. Keep Your Tax Notices
Even if you pay digitally, don't immediately throw away your tax notices.
Keep the information until you are sure the payment has been completed and recorded.
3. Don't Ignore Local Taxes
Not receiving or noticing a tax bill does not necessarily mean that you don't have a tax obligation.
If you own a vehicle, property, or have another applicable local tax obligation, make sure you check your payment requirements.
4. Late Payment Can Have Consequences
Missing a deadline can result in additional charges.
For example, Seoul's 2026 foreign-resident automobile tax guidance warns that late payment can result in a surcharge.
Korean bureaucracy can feel complicated when you're new to the country, but services like Seoul ETAX and STAX make some everyday administrative tasks much easier.
If you live in Seoul, don't wait until you receive a tax bill to learn how the system works. Knowing where to check your taxes and how to pay them can save you time, and potentially help you avoid unnecessary late-payment charges.
Whether you're paying resident tax, automobile tax, property tax, or another Seoul local charge, STAX gives you a convenient way to handle many payments directly from your phone.
Save this guide for the next time you receive a Seoul tax bill!
And check this article for more explanation of how to pay taxes.
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