A Generative AI / LLM Engineer earning the median salary of ¥11.6M in Japan takes home approximately ￥8,289,578/year (￥690,798/month) after national income tax, reconstruction surtax, resident tax, and employee social insurance, using 2026 rates.
2026 median salary for each level in Japan, and what it leaves after national income tax, reconstruction surtax, resident tax, and employee social insurance. Single employee, Tokyo standard rates, under 40. 2026 rates.
| Level | Gross / year | Take-home / year | Per month | Effective rate |
|---|---|---|---|---|
| Junior | ￥7,506,000 | ￥5,632,208￥469,351/mo | ￥469,351 | 25.0% |
| Mid-level | ￥11,325,000 | ￥8,129,357￥677,446/mo | ￥677,446 | 28.2% |
| Senior | ￥15,519,000 | ￥10,521,985￥876,832/mo | ￥876,832 | 32.2% |
| Lead / Principal | ￥20,331,000 | ￥13,184,983￥1,098,749/mo | ￥1,098,749 | 35.1% |
The biggest pay step is Senior to Lead / Principal: ￥4,812,000 more a year before tax, of which ￥2,662,998 reaches take-home. 45% of that raise goes to national income tax, reconstruction surtax, resident tax, and employee social insurance, against an average 32% on the Senior salary, because the extra pay is taxed at the top of your bands rather than spread across all of them.
Around the headline median, the middle half of Generative AI / LLM Engineer salaries in Japan run from ￥10,983,000 to ￥12,048,000 a year, which is ￥7,914,471 to ￥8,583,632 after national income tax, reconstruction surtax, resident tax, and employee social insurance.
The table above uses the Generative AI / LLM Engineer median. Enter your own gross salary below for a precise figure.
Annual take-home
￥8,289,578
Monthly take-home
￥690,798
Effective deduction rate
28.4%
National income tax
￥1,124,597
Reconstruction surtax
2.1% of national income tax
￥23,617
Resident tax
~10% (prefectural + municipal)
￥786,977
Health + pension + employment insurance
￥1,355,232
A Generative AI / LLM Engineer earning the median salary of ¥11.6M in Japan takes home approximately ￥8,289,578 per year (￥690,798 per month) after national income tax, reconstruction surtax, resident tax, and employee social insurance, using 2026 rates.
On a median Generative AI / LLM Engineer salary of ¥11.6M, the effective deduction rate (national income tax, reconstruction surtax, resident tax, and employee social insurance) is 28.4%, leaving ￥8,289,578 as take-home pay.
A senior Generative AI / LLM Engineer in Japan earns a median ￥15,519,000 a year and takes home approximately ￥10,521,985 (￥876,832 per month) after national income tax, reconstruction surtax, resident tax, and employee social insurance, an effective rate of 32.2%.
A junior Generative AI / LLM Engineer in Japan earns a median ￥7,506,000 a year and takes home approximately ￥5,632,208 (￥469,351 per month) after national income tax, reconstruction surtax, resident tax, and employee social insurance, an effective rate of 25.0%.
The biggest pay step is Senior to Lead / Principal: ￥4,812,000 more a year before tax, of which ￥2,662,998 reaches take-home. 45% of that raise goes to national income tax, reconstruction surtax, resident tax, and employee social insurance, against an average 32% on the Senior salary, because the extra pay is taxed at the top of your bands rather than spread across all of them.
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