The subsidy hasn't been increased in 5 years.
Over a quarter of tenants getting state rent subsidies have to make extra top up payments to private landlords.
The Housing Assistance Payment scheme gives state support to those struggling in the private rented sector.
But there has been criticism that the payment rates are too low, as rent prices have surged in recent years.
Despite surging rents, it hasn’t been increased since 2017.
Department of housing officials say a report on the issue was finally finished before Christmas, and new recommendations are expected shortly.
Paul O’Donoghue reports from the Public Accounts Committee:

Protestors, Including Kildare's John Dallon, Refused Entry From Government And Agriculture Bodies Meeting
Artemis II Prepares To Splash Down Off US Coast
Martin Heydon Will Meet Farming And Haulier Groups This Morning Amid Fuel Protests
Section Of N7 Northbound Closed Due To Protests
Kildare Filling Stations Among The More Than 100 Out Of Fuel
Nationwide Fuel Protest Continues Into Third Day
Two Separate Weather Warnings Issued For Tomorrow
International Wholesale Prices Are "Not Price Gouging", Says CCPC