Automatic Apportionments in OMB Circular No. A–11:

• Automatic apportionment for annual and multi-year TAFS to use up to 1% of the current appropriation to liquidate obligations that were incurred against canceled appropriations (Section 120.38 of OMB Circular No. A–11)
• Automatic pro-rata share apportionment of newly enacted full-year appropriations (Section 120.41 of OMB Circular No. A–11)
• Automatic adjustment of apportioned amounts in only one category by the lower of either $400,000 or two percent of the total budgetary resources and additional amounts for payment of interest for credit financing accounts (Section 120.49 of OMB Circular No. A–11)
• Automatic apportionment of obligational authority during an absence of appropriations (Section 124.5 of OMB Circular No. A–11)

Apportionments via OMB Bulletins:

• Under a continuing resolution, OMB issues a blanket apportionment for most impacted accounts. A link to the latest fiscal year bulletin is provided in section 123.3 of OMB Circular No. A–11.

Apportionment Authority:

• Delegation of apportionment authority (Federal Register)