A Woolworths spokeswoman said the registers were coming back online now. Many have left full trolleys behind.
"This type of incident should not occur and we apologise unreservedly to our customers and store teams for the inconvenience caused".
UPDATE 5PM: FRUSTRATED customers took to social media after being forced to abandon their groceries at Woolworths registers due to a national technical fault.
Supermarket giant Woolworths has suffered an IT outage this afternoon which affected registers at its stores nationwide.
As usual, customers took to social media to vent their frustrations and test out their ability to come up with humorous short takes.
"Shoppers have been told to leave groceries in baskets in the aisle", one customer from Brisbane wrote on Twitter. "We were all offered a box of chocolates".
"They've told everyone just to leave their food and leave the store". But no.you throw everyone out on school holidays with nothing for dinner.
Registers have shut down with stores unable to make sales.
A million-dollar IT glitch was to blame for the outage which saw Woolworths' shoppers standing in line with full trolleys for up to an hour on Monday afternoon.
News Corp Australia has contacted Woolworths for comment.