Situation: We are monthly Fed/FICA/Med filers. Our clerk accidentally added up all 3 months of our 3rd quarter withholding when she was paying the Sept withholding (online ACH payment). She realized she'd added up the entire quarter, went back into the online pay site and paid (another ACH payment) just the total for Sept (which is what should have happened the first time). End result: Our Fed/FICA/Med withholdings (deposits) for the 3rd qtr 2016 have been double paid. However, on the 941 for that quarter she put the correct amounts actually withheld in all three month's deposit boxes on page 2. So the actual Form 941 is completely correct as far as wage totals and what we really withheld. Question: How do we correct this? I've gone over the instructions for Form 941-X and it doesn't seem to address an error like this. It only refers to overreporting, but she didn't overreport on the 941, so there are no corrections to be done on it. She only overpaid the deposits section, but there isn't a place on 941-X for correcting that section. Any idea how to file for a refund for the overpaid amount? Is there something I'm missing on Form 941-X that would address this? Thanks for any help anyone can provide.