My HSA is with Fidelity and just out of curiosity I called them. They are aware of this situation and made the roll back so simple that it took me about 40 seconds to click on few options to have this rolled back. No need to print the form, fill and send -- all online and no charge. Much better than paying excise tax of $3 and hassle to fill additional form at tax time in 2019. This is what Fidelity sent me while I was on phone with them.
Request a Return of Excess on Your Fidelity HSA
Complete this request if you have made an excess annual contribution to your Fidelity Health Savings Account. This can be completed online or by downloading and mailing the completed form to Fidelity. Questions? Call us at 1-800-544-3716.
Click here to request a return of excess online >
Click here to download the form >