The Gulf state said it would contribute a total of USD 60 million while the Palestinian Authority grapples with a pay row, the first challenge for a government formed to try to end years of Palestinian rivalry.
Prime minister Rami Hamdallah "received a phone call from the Qatari prime minister (Sheikh Abdullah bin Naser bin Khalifa al-Thani), who told him that USD 20 million would be transferred each month for three months to pay Gaza employees," government spokesman Ihab Bseiso said in a statement.
The row started when the PA's Gaza-based staff received their salaries but their Hamas counterparts did not. This prompted Hamas to demand last week that employees from its disbanded Gaza government be taken onto the PA payroll.
Hamas disbanded its Gaza government under a reconciliation deal signed in April with the West Bank-based Palestine Liberation Organisation, which dominates the PA.
The PA has so far refused to pay Hamas's 50,000 civil servants, who are not registered as its employees because they were appointed after the Islamist movement ousted bitter rivals Fatah -- which dominates the PLO -- from Gaza in 2007.
The emir, Sheikh Tamim bin Hamad al-Thani, then "promised to help," particularly with paying the salaries of employees, a Hamas statement said.
Hamas's exiled chief Khaled Meshaal has been headquartered in Doha for more than two years after leaving his previous base in Damascus because of the conflict in Syria.