34 U.S.C. § 11185 — Payments

(a) In general Payments under this subchapter, pursuant to a grant or contract, can be made (after necessary adjustment, in the case of grants, on account of previously made overpayments or underpayments) in advance or by way of reimbursement, in such installments and on such conditions as the Administrator^* can determine.

(b) Percentage of approved costs Except as provided in the second sentence of section 11132(c) of this title , financial assistance extended under this subchapter must be 100 percent of the approved costs of the program or activity involved.

(c) Increase of grants to Indian tribes; waiver of liability
(1) In the case of a grant under this subchapter to an Indian tribe^*, if the Administrator determines that the tribe does not have sufficient funds available to meet the local share of the cost of any program or activity to be funded under the grant, the Administrator can increase the federal share of the cost of it to the extent the Administrator deems necessary.
(2) If a State^* does not have an adequate forum to enforce grant provisions imposing any liability on Indian tribes, the Administrator can waive State liability attributable to the liability of such tribes and can pursue such legal remedies as are necessary.