Thank you for your question, and thanks for coming to JustAnswer.com.
You should not have a problem paying all the taxes in the 4th quarter for money received throughout the year. The main thing is that he's paying payroll taxes during the year he earned the money. This is actually quite common to reclassify draws as salary at the end of the year, especially with S Corporations.
I would go ahead and prepare the transaction as requested. Please let us know if you need anything additional. Thanks again for using JustAnswer.com and have a happy, and safe, New Year.
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You should be aware that your question, as with most tax questions, can never really be answered completely...addressing all the permutations; that is because of the many assumptions that have to be made I have done my best to determine what I think you are asking and answering it in the most direct and understandable manner possible. If, however, after reviewing the questions, you have any uncertainties or further questions, please do not hesitate to ask.