From the Summary for Deeming Resolutions: Budget Enforcement in the Absence of a Budget Resolution (R44296, Oct. 29, 2018):
In the absence of agreement on a budget resolution, Congress may employ alternative legislative tools to serve as a substitute for a budget resolution. These substitutes are typically referred to as “deeming resolutions,” because they are deemed to serve in place of an annual budget resolution for the purposes of establishing enforceable budget levels for the upcoming fiscal year.
While referred to as deeming resolutions, such mechanisms are not formally defined and have no specifically prescribed content. Instead, they simply represent the House and Senate, often separately, engaging legislative procedures to deal with enforcement issues on an ad hoc basis. As described below, the mechanisms can vary significantly in content and timing. This report covers the use of deeming resolutions pertaining to fiscal years for which the House and Senate did not agree on a budget resolution.