It's called "tithing":
“Bring ye all the tithes into the storehouse, that there may be meat in mine house, and prove me herewith, saith the Lord of hosts, if I will not open you the windows of heaven, and pour you out a blessing, that there shall not be room enough to receive it.”-Mal. 3:10.
“We have found in our own home, as have thousands of others, that God’s blessing upon the nine-tenths, when we tithe, helps it to go farther than ten-tenths without His blessing.” -- Billy Graham
Here are the types of things tithes go to:
https://www.christianitytoday.com/news/2017/november/where-e...
In some cases, tithing is earmarked only for "church ministries", in which case the sect generally also has an additional "offerings" category used for non-ministry outreach.
Like the Orthodox Church, Baptists distinguish between tithing and giving an "offering." The word "tithe" actually means the "tenth part of agricultural produce or personal income." Because of this, Baptists believe that members should leave 10 percent of their income for tithing to their church. This tithe is expected and not optional. An offering would be anything above that you give to the Baptist church that exceeds the 10 percent that makes up your tithe.
https://classroom.synonym.com/what-do-baptists-believe-about...
Something like 100 million Baptists, 20 million Adventists (Baptists who observe a 7th day Sabbath), and many others, consider tithing an obligation.