Over the next few days, a small number of taxpayers will get to do something no one has ever done before: file their taxes directly with the IRS online, rather than through a third-party service.

The IRS will test its new Direct File website over the next few days in advance of its broader rollout for taxpayers in 12 states in March. Visitors to the new during “short, unannounced windows of time” will be able to start their tax returns, an IRS official said. After the time is up, people who started their taxes will be able to finish, but no new signups will be accepted.

The limited test is the first time members of the public will be able to try out the new system rather than the handpicked testers that have used it up to this point.

Direct File is the first time the government has allowed taxpayers to file their taxes online for free, directly through the IRS, instead of with a third-party service like TurboTax or H&R Block. The pilot program has limited capabilities compared to its private-sector counterparts, and users can only file their taxes if they have a relatively simple tax situation—at least at first.

The agency says its goal is to test the system this year and gather data before possibly expanding it to the whole country and adding more forms and deductions.

Taxpayers unable to access the new system can still file their taxes for free using the , which makes free tax filing available through third-party providers, but is subject to restrictions on income and which deductions are allowed.