As you ask people for a pledged gift, whether it is monthly, quarterly, or annually… keep it open ended.
For example, don’t ask a person for a for one year pledge. If you do that, you’ll have to follow up every year to secure from them still another annual pledge. I simply assume that the donor will keep on giving until one of three things take place:
1. You decide to leave the ministry.
2. The organization you currently are serving brings your ministry to a close.
3. The donor decides to change or stop their giving.