Changes proposed to attract additional Republican votes for the party’s bill to repeal and replace Obamacare will narrow the amount of deficit reduction by more than half, according to the nonpartisan Congressional Budget Office, potentially further complicating conservative support for the legislation.

Changes proposed this week would increase federal spending to eventually raise the size of tax credits offered to older people to buy health care. Those changes mean the bill would reduce the deficit by $150 billion over a decade, down from a previous version’s $337 billion, the CBO found.

The effect on insurance coverage and premiums is broadly the same as the past version of the GOP bill, the CBO said. The CBO determined last week that 24 million more people would be uninsured in 2026 under the Republican bill, compared to the Affordable Care Act. The changes to the bill included measures that could limit Medicaid enrollment, such as an option for states to institute a work requirement for able-bodied adults.