House Republicans on Monday announced their long-awaited legislation to repeal and replace Obamacare, but they can’t say how many people would get or lose coverage compared to the Affordable Care Act.

The bill puts income restrictions on insurance tax credits and drops a proposed cap on the tax break for employer-sponsored health coverage. The Congressional Budget Office has not released its estimate on how much the bill would cost, and Republicans hope to use savings from repealing Obamacare to pay for the new provisions.