As a country that faces constant economic turbulence, Ukraine is dealing with several challenges. This includes a significant increase in the deficit of budget resources while needing to finance military expenses, all while trying to maintain macroeconomic stability. This article focuses on the specifics of financing the deficit of the state budget of Ukraine during martial law. The financing of the state budget deficit is analyzed in terms of the classification of budget financing by the type of creditor and the type of debt obligation. These indicators were significantly affected by the military challenges in 2022 and the first half of 2023. The article also covers the budget deficit’s coverage analysis at the expense of revenues from the privatization of state property and the issuance of military government bonds, which gained popularity in Ukraine. The authors emphasized the importance of cooperation between the state and IFIs and other institutions as an essential source of financing for overcoming the deficit of the state budget. This form of cooperation is necessary for maintaining the country’s financial stability and resilience to face complex challenges. The article examines the measures to cover the budget deficit in military conditions, including the need to carry out budget system reforms, cost optimization, searching for new sources of income, expanding the tax base, and improving the efficiency of the tax system, which can provide additional funds in the budget. Other measures include financial transparency, investment stimulation, budget consolidation, increasing transparency, fighting corruption, improving conditions for entrepreneurship, achieving low and stable inflation, expanding the tax base, and speeding up the privatization of state enterprises.