Those who teach you must or should be tithing are false teachers.
NO ONE, absolutely NO ONE pays the Biblical tithe today.
Leviticus 27:30-33, Numbers 18: The First Tithe - a tenth of crops and animals and commanded to take the tithe to the Levites.
Deuteronomy 14:22-27: The Second Tithe aka The Festival Tithe - a tenth of crops, plus add to that the firstborn animals, and take for the yearly feast.
Deuteronomy 14:28-29: The Third Tithe aka The Three-Year Tithe aka The Poor Tithe - a tenth of crops, kept at home, and invite the Levites, widows, orphans, stranger to eat.
Now, tell me. Which of the above three tithes commanded by God does anyone follow today?
The ONLY people in the Old Testament that were commanded to tithe were those who INHERITED THE PROMISED LAND WITH EVERYTHING ON IT. They got the land, house, animals, crops, etc. ALL FREE AND CLEAR. No mortgage payment or rent to pay. And THEY were commanded to tithe on the crops and animals and take it to the Levites who INHERITED the tithe INSTEAD OF the promised land with everything on it. No one else tithed. Wage earners did not tithe. Jesus didn’t tithe as a carpenter. Paul didn’t tithe as a tent maker. Peter didn’t tithe as a fisherman.
Tithing ended at the cross per Hebrews 7:5,12,18.
The New Testament teaches generous, sacrificial giving, from the heart, according to our means. For some, $1 might be a sacrifice, while for others, even giving 50% of their income might not induce a sacrifice. In the Old Testament, ONLY the farmers tithed, and it was equal percentage (a tenth). The New Testament teaches the principle of equal sacrifice instead of equal percentage. Equal sacrifice is much harder to achieve, if not impossible, than giving ten percent.
You should give from the heart, whenever you can afford it, to whoever you want to give it to. Those who attend church have a moral obligation to give something to help pay the bills. Give as you are led by the Spirit.