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You will need to use form 941X to make corrections for previously filed form 941
Use a separate Form 941-X for each Form 941 that you are correcting. For example, if you found errors on your Forms 941 for the third and fourth quarters of 2014, file one Form 941-X to correct the 2014 third quarter Form 941. File a second Form 941-X to correct the 2014 fourth quarter Form 941.
In Part 4 line 23 - provide explanation of your changes.