How much money do you need to create a forum?

If you use open source forum scripts to create a forum, your expenses will be limited to domain and hosting which can be easily managed for $30 for the first year. However, if you want to use a paid script to build a forum, you will have to pay around $160 for a forum license (Xenforo) and an additional $100 for add-ons. Cost of add ons will increase if you want more features on your forum.

For me I know that it depends on the kind of forum that you need. Definitely a forum that can accommodate many active members and good servers plus the best software it requires very high amount of capital