The millions of immigrants who have surged into the United States since Joe Biden became president will have momentous effects on the economy and budget over the coming decade, according to a new official budget report.

The nonpartisan Congressional Budget Office released a detailed report Tuesday that found the U.S. will have brought in some 8.7 million more immigrants between 2021 and 2026. The CBO’s findings are noteworthy because they represent an effort to account for all the immigrants who have arrived via the overridden southern border in recent years, a development that other official government statistics have struggled to capture.