"The past few months have proven we can make that work.
"So if our employees are in a role and situation that enables them to work from home and they want to continue to do so forever, we will make that happen. If not, our offices will be their warm and welcoming selves, with some additional precautions, when we feel it's safe to return."
In an email obtained by BuzzFeed News, Dorsey said it was unlikely that the social media platform's offices would open before September.
He added that the remainder of the company's in-person events have been cancelled this year.
Twitter will assess its plans for 2021 events later this year.
Twitter's new policy comes as other tech giants including Google and Facebook announced that their employees would most likely be working from home until 2021.
• Covid19.govt.nz: The Government's official Covid-19 advisory website