The government announced on Tuesday evening more than $1.9 billion would be dedicated to national security and federal law enforcement over the next 10 years.

The Australian Security Intelligence Organisation will gain the lion's share of the funding at $1.3 billion with the domestic spy agency receiving $413.5 million over the next four years.

An additional $51.8 million will also be given to the Australian Criminal Intelligence Commission to support the development of its National Criminal Intelligence System along with its other functions.

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The commission, which will receive $38 million of the funding by June 2022, is tasked with creating a system that integrates information from state and territory law enforcement agencies into a national criminal database.

In addition to the funding announcements, a number of agencies have received substantial increases to their staffing caps for the 2021-22 period.

The biggest winners include ASIO and the Australian Federal Police, which will both grow by nearly 300 places each. The Australian Transaction Reports and Analysis Centre will get an additional 66 places.

The Department of Home Affairs will gain nearly 500 staff.

The newly-established Office of the Special Investigator, responsible for investigating the credible evidence of war crimes committed in Afghanistan as outlined in the Brereton report, will also more than double staff to 190.

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Home Affairs Minister Karen Andrews and Immigration Minister Alex Hawke said in a joint statement the funding will help the agencies deal with the rapidly changing technological landscape that is presenting challenges for the nation's security.

Intelligence watchdogs will also be given a minor boost of $4 million in redirected funds from the Home Affairs Department over the next four years.

The Commonwealth Ombudsman will receive the bulk of the ongoing yearly boost at nearly a million per year while the Office of the Inspector-General of Intelligence and Security (IGIS) will get the remainder.

Both are expected to increase staffing levels over the next year with an extra 23 places provided to IGIS and five to the ombudsman's office while law enforcement oversight body, the Australian Commission for Law Enforcement Integrity, will be given 46 ahead of plans to establish a new Commonwealth Integrity Commission this year.

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