Par. 20. Sections 48.6426-1 through 48.6426-7 are added to read as follows:
(a) Limitations applicable to mixtures. In the case of mixtures, the following limitations apply:
(1) The aggregate amount that, but for the coordination rules in sections 6426(g) and 6427(e)(3), would be allowable to a claimant either as a credit under section 6426 or a payment under section 6427 with respect to sales and uses of mixtures during a calendar quarter is allowed only as a credit under section 6426 to the extent such amount does not exceed the claimant's tax liability under section 4081 for the calendar quarter.
(2) The aggregate amount allowed to a claimant as a payment under section 6427 or an income tax credit under section 34 with respect to sales and uses of mixtures during a calendar quarter shall not exceed the amount that, but for the coordination rules in sections 6426(g) and 6427(e)(3), would be allowable to the claimant with respect to such sales and uses reduced by the claimant's tax liability under section 4081 for the calendar quarter.
(b) Limitations applicable to alternative fuel. In the case of alternative fuel, the following limitations apply:
(1) The aggregate amount that, but for the coordination rules in sections 6426(g) and 6427(e)(3), would be allowable to a claimant either as a credit under section 6426 or a payment under section 6427 with respect to sales and uses of alternative fuel during a calendar quarter is allowed only as a credit under section 6426 to the extent such amount does not exceed the claimant's tax liability under section 4041 for the calendar quarter.
(2) The aggregate amount allowed to a claimant as a payment under section 6427 or an income tax credit under section 34 with respect to sales and uses of alternative fuel during a calendar quarter shall not exceed the amount that, but for the coordination rules in sections 6426(g) and 6427(e)(3), would be allowable to the claimant with respect to such sales and uses reduced by the claimant's tax liability under section 4041 for the calendar quarter.
(c) Effective/applicability dates. This section is applicable on and after the date of publication of these regulations as final regulations in the Federal Register .