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Changed jobs this year?
Combine your previous employer’s income

Two employers each withholding on part of your salary means each used a lower rate than your combined income deserves. That is why job-change years often end with tax due.

NFM Apps guide · 2026-10-02

Why income must be combined

Korean income tax is progressive and applies to the whole year’s gross pay. Two halves of 25 million KRW each sit in a low bracket on their own but not together. Your previous employer also settled your tax when you left, applying full-year basic deductions; once combined, those deductions count only once.

This guide is general tax information and a walk-through of how the numbers work, not tax advice. Deduction rules change every year and depend on your residency status and situation. Confirm what applies to you with the National Tax Service (Hometax year-end settlement preview and simplified service, NTS helpline 126) and your employer’s payroll or HR team. The app’s result is an estimate covering major items only and has no legal effect.

What you need

  1. The earned income withholding receipt from your previous employer. Ask their HR, or download it from Hometax once the employer has filed it.
  2. Submit it to your current employer at the year-end settlement so the income is combined.
  3. If it was not combined, you must file both incomes together in the May income tax return of the following year. Not filing can lead to a later assessment with penalties.

If you stopped working

If you do not work again before year-end, the settlement your employer did on departure (basic deductions only) stands. To add card or medical deductions from the months you worked, file in May the following year. If you are leaving Korea for good, ask HR or the NTS about settling before departure.

Previewing the combined result

Calculator tab input screen
Combined gross
1

Enter both salaries together

Enter the sum of both employers’ taxable gross pay and your full-year card and medical spending.

Breakdown with Tax already paid and Final tax lines
Tax already paid vs final tax
2

Enter combined tax already paid

Under “Enter tax already paid”, add the final income tax on the previous employer’s receipt to the income tax withheld by your current employer this year. The automatic estimate assumes one employer all year, so always enter it in a job-change year.

The app’s English screens show amounts with the Korean won sign, and the saved-scenario card keeps a few Korean labels in the current version.

FAQ

My previous employer won’t send the receipt.

After the employer files its annual statement, you can view and print it on Hometax. Check the NTS schedule.

Three employers in one year?

Combine all of them; submit each receipt to your current employer.

Sources: eToday, missed deductions can be claimed for 5 years (Korean) · NTS Hometax

Year-End Tax Calculator

No sign-up, works offline, and your salary data stays on your phone. Free on Android, in English and Korean.

Get it on Google Play