New Hampshire has no general income tax at the state level.
New Hampshire has no capital gains tax at the state level.
Interest and Dividends
There is currently an Interests and Dividends tax at 4%. This tax is going away after December 31st, 2024 thanks to the effort of liberty legislators in NH.
2025 and afterward, there is officially zero interest and dividends taxes in New Hampshire, making New Hampshire 100% free of all income taxes.
Additionally, so long as this tax is still in place, parents can use the NH Educational Tax Credit Program to deduct education expenses against these taxes upon acceptance of application.
You may be interested in reading about New Hampshire Corporate Taxes.