Mr. Ventry said that if return-free filing were operated nationally, tens of millions of people with simple tax situations might have to do just a few minutes of work at tax time every year. The I.R.S. would send them a tax return that had already been filled in with their financial data, and if everything looked in order, they would file it either through the mail or electronically. The return would be completely voluntary. People who disputed the I.R.S.’s calculation would be able to do their taxes the old-fashioned way. Tens of millions of additional taxpayers with more complex returns would be able to save time by downloading all the financial information that the government has collected about them during the year. You would be able to do your return without hunting for every stray W2 or 1099 in your household.

“It can help all 145 million taxpayers,” Mr. Ventry said.

But Intuit’s opposition to return-free filing has been ferocious. In the last five years, according to disclosure documents, Intuit spent nearly $13 million on federal lobbying. That is about the same amount that companies many times its size have spent on lobbying. Apple, which has an annual income about 40 times that of Intuit, also spent about $13 million on lobbying in the same period. While documents show that Intuit lobbies on several issues, including immigration, cybersecurity and intellectual property law, the company’s largest lobbying contracts all involve the issue of tax administration.