Is it correct to use will after if when offering something?

As a general rule, in a condition if is never followed by will. However, use will after if to emphasise that it is not just a condition, but that the other person may accept or decline your offer.

For example, a phrase like this: If you will write the article, I will attend to something else.
Solidify this grammar point right now
(you will be asked to create an account if you do not have one)

Learn more simple rules

Phrase the Cat inviting to practise English Phrase the Cat waving

At you can study grammar points and practise their application right away.