This report reviews the potential impact of immigration on the Federal budget over the next 10 years. The report, using fiscal year 1984 as a baseline, discusses in detail the budgetary impact of immigration on State and local governments. Major federal immigrant-related outlays and revenues for that period are identified and/or estimated. These data are then projected to yield 1990 and 1995 estimates under three different sets of scenarios as to the future social, economic, and political environment. Similar data for selected programs and localities in the five most impacted States are presented for illustrative purpose--no projections were made at this level. The analysis demonstrates that significant budgetary impacts of immigration exist at the Federal level, in terms both of outlays and revenues. For fiscal year 1984, in the programs examined: (1) per capita Federal outlays for immigrants were roughly comparable to those for average United States residents; (2) per capita, immigrants contributed fewer revenues to the Federal government than average United States residents; and (3) total immigrant-related outlays differed only slightly from total immigrant-related revenues. Under all three scenarios examined, these observations remain valid for 1990 and 1995, although uncertainty increases. A glossary is included. (KH)