Income Tax and Resident Tax in Japan: What Newcomers Should Understand
Updated: 2026-08-26
Quick answer
Japan has two personal taxes worth knowing early: income tax, which most employees never touch because it is taken out of each paycheck, and resident tax (住民税), which is billed separately based on what you earned the year before. The second one is what catches newcomers off guard.
This is a planning and procedure guide, not tax advice. I will not quote rates or amounts, because your situation decides those. For anything specific, please lean on official guidance or a licensed professional.
Income tax, usually taken from your pay
If you work for a company here, income tax is typically withheld from your salary before it reaches your account. You do not send it in yourself each month; your employer handles the deductions on your behalf.
Because it happens quietly in the background, many people never think about it. That is fine for now, but it helps to know the label 源泉徴収 (withholding at source) when you see it on a payslip, so nothing looks mysterious.
Year-end adjustment (年末調整)
Around the end of the year, employers run a year-end adjustment called 年末調整. This reconciles the tax that was withheld across the year against what you actually owe, taking into account certain deductions you report.
Your part is usually filling in a short form and handing over any documents your workplace asks for. Do it carefully and on time, and for most employees this settles income tax without any separate visit to the tax office.
Resident tax and the second-year surprise
Resident tax (住民税) is collected by your local municipality, and here is the twist: it is calculated on the income you earned the previous year. In your first year in Japan there is often little or nothing to pay, because there is no prior-year local income to base it on.
That is exactly why the second year surprises people. Bills or payroll deductions appear that reflect a full previous year of earnings, even if your current income has dropped or you have changed jobs. Knowing it is coming lets you set money aside instead of being startled.
How resident tax reaches you
It usually arrives one of two ways: taken from your monthly pay by your employer, or sent to you as payment slips you settle in installments. Which one applies depends on your employment situation, so check how yours is set up.
If you leave a job or plan to leave Japan, resident tax does not simply vanish. It can still be owed for the earlier year, so it is worth asking your municipality or employer how any remaining balance is handled before you move on.
Who needs to file a return (確定申告)
Many salaried people never file, because year-end adjustment covers them. A tax return, 確定申告, tends to come into play if you have side income, more than one employer, income from abroad, certain deductions to claim, or a year that the year-end adjustment did not fully settle.
The filing season falls in the earlier part of the year for the income of the year before. If you are unsure whether you fall into a filing situation, that is a good moment to check official guidance or ask a professional rather than guess.
Staying on top of it, online
A lot of this can now be handled online through the tax portal and the My Number system, from checking notices to filing. These portals often confirm it is really you by sending a code or a prompt to your phone, so your Japanese mobile number quietly becomes part of your tax setup.
That is where keeping an active local number matters. Rakuten Mobile lets you sign up with just your residence card, and an eSIM can be ready the same day, often in about five to ten minutes, so you can log in and verify when a deadline is close. It is one simple unlimited plan, and domestic calls are free through the Rakuten Link app. Nothing about taxes is fun, but not being locked out of your own portal makes the whole thing calmer.
Related guides
Opening a Bank Account in Japan: What Newcomers Need (2026)
A calm, step-by-step guide to opening your first Japanese bank account — the documents, the right order to do things, and why your phone number comes first. #PR
Read the guide →Long-Term Care Insurance in Japan: Kaigo Hoken and Support for Aging Family
A calm, plain guide to Japan's long-term care insurance (kaigo hoken): who contributes, how the ward assessment works, and the home and facility services it helps arrange. #PR
Read the guide →
Year-End Tax Adjustment (Nenmatsu Chosei) and Filing a Return in Japan
What the year-end adjustment does, the forms your employer asks for, and when you file your own return instead. #PR
Read the guide →