For a full-time worker, the total average annual income is approximately 2.5 million JPY ($ 23,000 US) to 5 million JPY ($ 46,000 US). The average annual income in Japan is around 4.3 million ($ 39,000 US). From this, health insurance premiums, welfare insurance premiums, employment insurance premiums, income tax, and resident tax are deducted, and about 75% to 80% of the total will remain. The salary does depend on the restaurant, as head chefs of high-class Japanese restaurants and sushi restaurants sometime earn more than 10 million yen ($ 92,000 US) a year.
In case of part-time work, wages are paid by the hour, in Tokyo 1,000 – 1,300 JPY per hour is the going rate ($ 9 – 11 US). Of course, much depends on the restaurant you work for and the wages you receive, but after taxes and insurance premiums, you will be left with about 80 -100 % of the total.