[Summary]
Resident tax is often talked about as an opportunity for a side job to be known by a company. However, it is not so simple that it can be completely controlled by resident tax alone.
If you have income other than salary, it may affect your resident tax amount. It is necessary to check the option column regarding resident tax when filing a final tax return and the handling of the local government, but there are also risks related to company regulations, social insurance, and the way of working itself.
In this article, we will organize the points that beginners should check first in the order in which they are most likely to stumble in practice. Since taxes vary depending on individual circumstances, please confirm the final decision with an official or specialized contact such as the National Tax Agency, local government, tax office, or tax accountant.
First, the conclusion
If you have income other than salary, it may affect your resident tax amount. It is necessary to check the option column regarding resident tax when filing a final tax return and the handling of the local government, but there are also risks related to company regulations, social insurance, and the way of working itself.
| Check points | way of seeing |
|---|---|
| Resident tax | Calculated by the local government based on the previous year's income. |
| special collection | A method of deduction from your salary. |
| Normal collection | Method of paying by yourself. You may be able to choose a side job. |
| Caution | It varies depending on the municipality's treatment and the type of income. |
The important thing when reading tax articles is not just memorizing the system name. It's about looking at your income, accounts, deductions, and reporting methods separately.
common misconceptions
- I don't think you'll ever find out if you choose normal tax collection.
- Don't check the company's side job regulations.
- Think of salary income side jobs and outsourcing side jobs as the same.
This is an area where it is easy to get confused just by reading the search article. In particular, "sales" and "income," "income tax" and "resident tax," and "NISA" and "taxable account" need to be treated as different things.
Order of actual checking
If you are confused, it will be easier to organize if you check them in the following order.
- Have you checked the company's work regulations?
- Have you checked the type of income from your side job?
- Have you checked the resident tax column?
- Have you seen how the local government handles it?
If it is still difficult to make a decision after looking at the above, it is safer not to leave it to your own judgment. Please check through official channels such as consultation with the tax office, the National Tax Agency's tax return preparation corner, and consultation with a tax accountant.
Summary
When it comes to resident tax for side jobs, it is more important to check the local government and company regulations than what is said online. Think not only about taxes, but also about the rules with your workplace.
While it's hard to get away with not knowing about taxes, there's no need to fear them too much if you sort them out early. When your income increases, when you start investing, or when you want to use deductions, it is most practical to prepare your records early rather than at the end of the year.
Source/reference materials
- National Tax Agency, No.1900 Salary earners who are required to file a final tax return
- National Tax Agency, No.1906 When salaried workers earn supplementary income from online auctions, etc.
- Confirmation date: 2026-05-30