The territory had fallen $333 million into the red by the end of April, up from a $211 million deficit in March, according to Treasury figures published under freedom of information laws.

The figures represent the first set of ACT budget numbers which take into account Australia's coronavirus shutdown, which forced businesses to close, confined consumers to their homes and forced governments to spend unprecedented amounts to prop up their economies.

The April snapshot does not predict how much further into deficit the territory will be at the end of the financial year, nor would Chief Minister Andrew Barr speculate on the 2019-20 budget outcome when asked by The Canberra Times on Monday.

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Mr Barr is scheduled to reveal those figures in an economic update to the ACT Legislative Assembly before the end of August.

The Chief Minister last week signaled the 2019-20 deficit would be in the "hundreds of millions of dollars", with the following fiscal year to be even more dire.

The ACT is expected to lose $140 million alone in GST revenue next financial year, as some $7.6 billion is drained from the national pool.

In a statement, an ACT government spokeswoman said while the territory's estimated budget position for this financial year was yet to be finalised, there was "no doubt that, like every other government in the world, we will record a large deficit".

The spokeswoman said the budget hit was the result of decreased tax and GST revenue, coupled with increased spending on health and economic support measures.

Mr Barr's economic statement in June provided the first glimpse into the looming scale of the budget hit from the COVID-19 crisis, revealing government tax revenue was down about 6 per cent compared to the mid-year estimates.