The term "expenditure side" refers to the part of a financial system or budget that shows the spending or money going out. It includes all the expenses or costs incurred by an individual, organization, or government. Full definition
The State and Local Fiscal Situations: What are the implications of the budget choices of the last several years on the revenue and expenditure sides of the state budget and the budgets of New York's local governments? (fiscalpolicy.org)
The DCCC is simply moving the money from its independent expenditure side (which can not coordinate with campaigns) to the coordinated side. (rollcall.com)
My recommendation on the tax expenditure side is to combine the Child Tax Credit and the Earned Income Tax Credit into a single program, and eliminate all the other tax expenditures listed in Table 1. (educationnext.org)