By Peter Hoskins
Business reporter.
Business and government users may need to pay a fee to stay on the social media platform, according to Musk.
The board of the social media company agreed to a takeover offer from Mr Musk.
Mr Musk said the site would be free for casual users.
He had previously stated that he wanted to make the product better by adding new features.
A request for comment was not immediately responded to.
The BBC is not responsible for the content of external sites.View original tweet on TwitterTwitter will always be free for casual users, but maybe a slight cost for commercial/government users
— Elon Musk (@elonmusk) May 3, 2022
A CNN story called for some of the US's biggest brands to boycott Twitter if Mr Musk rolls back content moderation policies limiting hate speech.
He has argued that the moderation policies of the social networking site pose a threat to freedom of speech.
Mr Musk has said he wants to make improvements to help increase the attractiveness of what he describes as a niche platform.
He said he would introduce new features and suggested changes to its new premium subscription service.
The paid-for extra service will add features such as a button, bookmarks, and a reader mode.
Mr Musk said he wants to remove fake people from the platform.
At the Met Gala in New York on Monday, he said that he wanted to make sure that the public was aware of how the service is promoted or demoted.
The multi-billionaire has told potential investors that he may return the social media firm to the stock market in a few years.
According to the Wall Street Journal, Mr Musk plans to sell his shares in three years.
His takeover of the company is expected to be completed later this year, subject to the approval of the company's shareholders and regulators.
He will buy all of the shares in the company that are currently available on the stock market, and take it from being a publicly-owned company to a private one.
Last week, Mr Musk sold about $8.5 billion worth of shares in the company, leading to speculation that he will use the money to finance his acquisition of the company.
Concerns that Mr Musk would sell part of his stake in the company to fund the deal have caused shares in the electric car company to lose 20% of their value in the last month.
Mr Musk has an estimated net worth of $250 billion, mostly due to his stake in the electric car company.
He has a controlling stake in the rocket company, which is worth $100 billion.