Hi I'm new here so please feel free to let me know if I'm breaking any norms but I'll cut to the chase:
Last year I began freelancing and generated about $50K. Do you think it be weird/ pompous to let them my main clients know I donated 10% of that to Give well's top charities?
I was thinking of slipping a note about that into a holiday gift package. I would love to introduce them to EA charities and maybe get them interested in some but don't want to be strange and hurt my business.
One idea to be less preachy is to frame your donation as a thank you from its recipients to your client. E.g. you could say something like: "I got the money you wired me. Thank you. I thought it might warm your heart to know that I donated 10% of the money to X organization, and as a result Y outcome occurred. So, you have made some Z individuals quite thankful as well!" Basically sort of give them a taste of what it feels like to give effectively.
BTW, I suspect communicating this info will work better in live conversation. If you communicate in live conversation, you create a space for them to ask questions and learn more, plus over time you might get better at bringing it up in a way that's not weird.