A new tax bill with bipartisan backing in both the House and Senate could make it illegal for the IRS to create its own online system for filing taxes. A provision in the House’s Taxpayer First Act would bar the agency from offering an easier, low-cost or cost-free way of filing, even though an estimated 70% of Americans are eligible to file for free based on their incomes. Tax filing companies such as TurboTax and H&R Block have long lobbied to block the IRS from offering the service in order to maintain their share of the e-filing market.