Which country first implemented zero-based budgeting?

Zero-based budgeting was first introduced in the United States during the 1970s. This budgeting approach was developed by Peter Pyhrr, a manager at Texas Instruments, and was later implemented at the federal government level during President Jimmy Carter's administration as part of his comprehensive reform of government budgeting. Zero-based budgeting requires each department to justify its entire budget from scratch (from "zero base") for each fiscal period, rather than only explaining expenditures that exceed the previous budget. This methodology aims to improve efficiency by ensuring that all expenditures are thoroughly evaluated and justified.