I’ve been asked about toward vs. towards and when it is correct to use them. I had to do some research on this one, as I wasn’t sure myself. As it turns out, both are correct and there aren’t really any rules about them. As the Grammarist said:

Toward and towards are equally acceptable words. The main difference is that, while both of these directional words are used in all varieties of English, toward is preferred in American and Canadian English, while towards is preferred in varieties of English from outside North America. These are not rules, however, and exceptions abound, so you’re safe using the one that sounds better to you. 

So there you have it. Use whichever one works for you.