They voted 38 to ten to back the package that will raise an extra £10m on income tax by stripping away exemptions and allowances for middle to high earners.
That money will go towards the £80-100m tax black hole caused by changes to the Island’s corporate tax structure.
Members voted down a reference back motion that would have suspended the debate.
Instead, they backed the proposals by a strong margin after hearing that the tax threshold would be raised over the next three years, and that under the proposals 28% of households would not pay any income tax at all.
Treasury Minister Terry Le Sueur told the House that some Islanders would be getting a tax cut, not a tax increase under the revised ’20 means 20′ proposals.
The ’20 means 20′ package, he said, represented the progressive side of the Fiscal Strategy and would take away generous allowances and exemptions from some people who did not need them.