Tax Guide Form 943: What You Should Know for Farmworker Withholding Form 943: Federal Tax Withholding From Agricultural Wages In this post we take a closer look at IRS Form 943 used for tax withholding for farmworkers. Once you get the basics ... Tax Guide Form 943: Federal Tax Withholding From Agricultural Wages This post was updated in April 2018 If you run a farm or other agricultural business and have employees, you likely will need to fill out and submit a ...