The Social Democrats say ESRI research proves that Budget 2020 will increase poverty rates across the country.
The party's co-leader said their analysis shows the Government has little regard for the less well-off in Irish society.
Deputy Roisin Shorthall said it is clear poverty was the last thing on Fine Gael's mind when it was planning for next year.
Ms Shortall said: "A couple, for example, on pensions will experience a cut, in effect, of around €6 a week next year. Equally, people who are on the minimum wage who are expecting a 30c increase are being denied that now.
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"So, what we are saying is that people on lower incomes, who can least afford to pay, will take the brunt of Brexit, and that is completely unfair."
