The charity regulator is warning charities that they must abide by advocacy rules or risk regulatory action.
ACNC Commissioner Sue Woodward AM said, "Charities can engage in election advocacy if it supports their charitable purpose. It is often an important part of their work.
"They should not endorse political candidates, but they can rank policies. They should avoid any activity that could be perceived as being partisan.
"Charities have obligations to act honestly and fairly so they need to ensure any campaigning meets community standards and is within the law.
"Information they produce should be true, fair and an accurate reflection of candidates’ policies, not tell people who to vote for."
Ms Woodward said that most charities have been acting correctly, which is reflected in a decrease in concerns compared to the last federal election.
"We have worked hard to ensure charities understand the rules and judging by the number of concerns received most charities are doing the right thing.
"Where we become aware that charities might be in breach of the rules, we reach out to them. Most charities are happy to receive advice and comply."
She said for serious or repeated breaches, charities risk their registration. The ACNC will continue to investigate concerns and take proportionate action, even after the election on Saturday.
"Our role includes protecting public trust and confidence in charities. Charities need to remember their actions can damage their public standing, as well as the reputation of the sector more broadly."