OAKLAND — The freewheeling ride-hail drivers for Uber and Lyft could soon take a hit to their self-employed income: The city wants them to pay a business tax.

The city’s finance committee on Tuesday will discuss expanding a flat tax to include Uber and Lyft drivers who work in Oakland. Months in the making, the request by council members Rebecca Kaplan and Dan Kalb would require the drivers to pay $72 a year, a possible windfall for the city’s revenue stream.

Currently, taxi drivers and others who have a business in Oakland, even small, independent workers, pay the tax but the ride-hail companies have skirted the tax.

“The big picture here is we need money for libraries and public safety and money to fill potholes and to have huge companies not paying taxes is not fair,” Kaplan said Monday.

A report by Margaret O’Brien, the city’s revenue and tax administrator, did not indicate how many workers pick up and drop off people in Oakland or how much money the tax would generate.

One option, according to O’Brien’s report, is to issue an administrative subpoena to require Uber and Lyft to release the names of drivers and other information so the city can enforce the business tax.

Kaplan is hoping the city can work with the companies to collect the tax and send the city one check instead of using city workers to track down individual drivers. She said that would be time-consuming and possibly end up costing the city in the end.

Two years ago, Kaplan led the effort to tax short-term residential rentals.

“Tax evasion is not a new technology,” Kaplan said. “For someone to not pay their taxes undermines the fabric of the system and undermines public services.”

An Uber spokeswoman declined to comment; an email to the media relations offices of Lyft went unanswered. The finance committee will hear a report from O’Brien and discuss the matter at a 9:30 a.m. meeting on Tuesday.