ACT leader David Seymour isn't sure National's proposed taxes will help New Zealanders.

The party's released their alternative budget today, promising modest income tax cuts of $16 billion over four years.

It's also proposing three tax rates rather than five.

Seymour says whoever leads the next Government will have to have an honest conversation about what the numbers require.

"I'm not confident that adding more taxes is the real solution- the real solution is to get spending under control. Which we do, as I say, by $25 billion."

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