@linglingfa: I've been working on the company's annual financial settlement recently. Going over the employee salaries with the tax …

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Summary

The author built an AI-assisted payroll calculation tool to help small and medium-sized business owners in Japan understand the total cost of employee salaries, including taxes and insurance.

I've been working on the company's annual financial settlement recently. Going over the employee salaries with the tax accountant has left me dizzy and confused... In the end, I just told the tax accountant, whatever you say it is, we'll adjust accordingly—overpay or underpay as needed—as long as we don't evade taxes. Japan has tons of tools to help calculate salaries, personal income taxes, pensions, and insurance, but they're all geared toward helping employees figure out: "If my monthly salary is 400,000 yen, how much should I actually take home each month?" But there's nothing out there to help bosses figure it out: If I hire someone at a monthly salary of 400,000 yen, how much am I actually shelling out each month? In general, in Tokyo, for an employee salary of 400,000 yen, the employee takes home about 329,000 yen per month, while the boss ends up spending 463,000 yen... (T_T). Thank goodness for AI these days—it's made things so much easier. I rolled up my sleeves and built a more useful payroll calculation tool tailored to my own needs. It's designed to help small and medium-sized business owners in Japan get a clear picture of how wages really work here. If you want to get a handle on how wages work in Japan too, feel free to give it a try:
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Cached at: 09/18/26, 12:25 AM

I’ve been working on the company’s annual financial settlement recently. Going over the employee salaries with the tax accountant has left me dizzy and confused… In the end, I just told the tax accountant, whatever you say it is, we’ll adjust accordingly—overpay or underpay as needed—as long as we don’t evade taxes.

Japan has tons of tools to help calculate salaries, personal income taxes, pensions, and insurance, but they’re all geared toward helping employees figure out: “If my monthly salary is 400,000 yen, how much should I actually take home each month?”

But there’s nothing out there to help bosses figure it out: If I hire someone at a monthly salary of 400,000 yen, how much am I actually shelling out each month?

In general, in Tokyo, for an employee salary of 400,000 yen, the employee takes home about 329,000 yen per month, while the boss ends up spending 463,000 yen… (T_T).

Thank goodness for AI these days—it’s made things so much easier. I rolled up my sleeves and built a more useful payroll calculation tool tailored to my own needs. It’s designed to help small and medium-sized business owners in Japan get a clear picture of how wages really work here.

If you want to get a handle on how wages work in Japan too, feel free to give it a try:

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