The Tsumitate NISA (つみたてNISA) is a tax-efficient investment account designed for monthly investments into Japanese-domiciled mutual funds. The annual limit that can be invested is ¥400,000. Investments made in a particular year are free of capital gains and dividend tax for 20 years.
2023 is the last year contributions can be made to a Tsumitate NISA, which will remain tax-free until the end of 2042. From 2024, NISA and Tsumitate NISA are being combined into a new NISA with a lifetime allowance. See the NISA article for more details.
Note that in any calendar year, an individual cannot contribute to both a NISA and a Tsumitate NISA.
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