CBO is required to report its assessment of whether enacted appropriations for the current fiscal year exceed caps on discretionary spending. In CBO's estimation, they do not, and hence a sequestration will not be required for 2016.
Within 10 days of the end of a session of Congress, CBO is required by law to issue a report that provides estimates of the limits (often called "caps") on discretionary budget authority in effect for each fiscal year through 2021. CBO is also required to report whether, according to its estimates, enacted legislation for the current fiscal year has exceeded those caps; if the caps were exceeded, a sequestration (that is, a cancellation of budgetary resources) would be required.
In CBO's estimation, such a sequestration will not be required for 2016. However, the authority to determine whether a sequestration is required and, if so, exactly how to make the necessary cuts in budget authority rests with the Administration’s Office of Management and Budget (OMB). Those determinations are based on OMB’s own estimates of federal spending.