The paper deals with the comprehensive study of calculation methods and the author’s methodology for adjusting the amount of rental payments for land parcels in state ownership with the permitted use for improvement using the case of Irkutsk city. The paper is focused on the urgent problem of compliance with established principles for determination of rent for land parcels, especially the principles of predictability of calculations, prevention of deterioration in the economic condition of land users and support of socially significant activities. A study of domestic and foreign practice has revealed two main problems in calculation of land rent: the adequacy of the cadastral value of land, mainly due to taking into account the maximum number of relevant factors, and the correctness of adjustment factors to this value when determining the rental rate. Using Irkutsk city as an example, the following shortcomings were found in the existing approaches: inaccuracy of the calculations and fixed coefficients and percentages applied to the calculation of rent within the municipality, regardless of the forms of permitted use. Special attention is paid to areas intended for improvement. These areas cannot be classified as investment assets that bring economic benefits. It is proposed to individualize the determination of adjustment factors to the cadastral value, taking into account the cadastral quarter and the type of permitted use. The developed changes comply with the principles for determination of rent enshrined in the legislation of the Russian Federation. The proposed methodological improvements were tested by comparison of actual and estimated rent receipts to the budget of Irkutsk city in 2023. The application of the proposed methodology will prevent the termination of land lease agreements due to unreasonably inflated rent costs, ensuring a balance of public and private interests.