Congressional Budget Office Cost Estimate: H.R. 986, Tribal Labor Sovereignty Act of 2017 [open pdf - 21KB]
From the Document: "H.R. 986 would add tribes to the list of entities that are excluded from the definition of 'employer' for purposes of the National Labor Relations Act. Through the National Labor Relations Board (NLRB), the National Labor Relations Act protects the rights of most private-sector employees to form a union and to bargain collectively. Adding tribes to the list of excluded employers would treat them similarly to state and local governments. Currently, the NLRB generally asserts jurisdiction over the commercial enterprises owned and operated by Indian tribes, even if they are located on a tribal reservation. However, the NLRB does not assert jurisdiction over tribal enterprises that carry out traditional tribal or governmental functions. Enacting H.R. 986 would not significantly affect the workload of the NLRB and thus would have no effect on the federal budget. Because enacting the bill would not affect direct spending or revenues, pay-as-you-go procedures do not apply. CBO [Congressional Budget Office] estimates that enacting H.R. 986 would not increase net direct spending or on-budget deficits in any of the four consecutive 10-year periods beginning in 2028."
Congressional Budget Office: http://www.cbo.gov/