A Quantitative Developer (C++ / Python) earning the median salary of ¥12.4M in Japan takes home approximately ￥8,826,349/year (￥735,529/month) after national income tax, reconstruction surtax, resident tax, and employee social insurance, using 2026 rates.
Quantitative Developer (C++ / Python) take-home pay across the salary range
Single employee, Tokyo standard rates, under 40. 2026 rates.
Entry (P25)
￥11,743,000
gross/year
Take-home
￥8,422,477
￥701,873/month
Total tax
￥3,320,523
28.3% effective rate
Breakdown
national income tax, reconstruction surtax, resident tax, and employee social insurance
Median
￥12,385,000
gross/year
Take-home
￥8,826,349
￥735,529/month
Total tax
￥3,558,651
28.7% effective rate
Breakdown
national income tax, reconstruction surtax, resident tax, and employee social insurance
Senior (P75)
￥12,893,000
gross/year
Take-home
￥9,145,924
￥762,160/month
Total tax
￥3,747,076
29.1% effective rate
Breakdown
national income tax, reconstruction surtax, resident tax, and employee social insurance
Adjust for your actual salary
The table above uses the Quantitative Developer (C++ / Python) median. Enter your own gross salary below for a precise figure.
Annual take-home
￥8,826,349
Monthly take-home
￥735,529
Effective deduction rate
28.7%
National income tax
￥1,302,765
Reconstruction surtax
2.1% of national income tax
￥27,358
Resident tax
~10% (prefectural + municipal)
￥842,941
Health + pension + employment insurance
￥1,385,586
A Quantitative Developer (C++ / Python) earning the median salary of ¥12.4M in Japan takes home approximately ￥8,826,349 per year (￥735,529 per month) after national income tax, reconstruction surtax, resident tax, and employee social insurance, using 2026 rates.
On a median Quantitative Developer (C++ / Python) salary of ¥12.4M, the effective deduction rate (national income tax, reconstruction surtax, resident tax, and employee social insurance) is 28.7%, leaving ￥8,826,349 as take-home pay.
A senior Quantitative Developer (C++ / Python) earning ¥12.9M (P75 of the salary range) takes home approximately ￥9,145,924 per year (￥762,160 per month) after national income tax, reconstruction surtax, resident tax, and employee social insurance, with an effective rate of 29.1%.
A junior Quantitative Developer (C++ / Python) earning ¥11.7M (P25 of the salary range) takes home approximately ￥8,422,477 per year (￥701,873 per month) after national income tax, reconstruction surtax, resident tax, and employee social insurance, with an effective rate of 28.3%.
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