Learn how to run a bonus payroll and accurately calculate bonus pay and taxes with our comprehensive small business guide. Each year, the Arizona State Legislature considers if it will adopt changes made to the federal tax laws in the prior year.These forms assume the Legislature. The IRS views any bonus you receive as wages. This means that almost all bonuses are taxed. Under Arizona law, an employer cannot be forced to pay a discretionary bonus. For example, many employers give bonuses at the end of the year. You must use Form 140 rather than Form 140A or Form 140EZ to file for 2020 if any of the following apply to you. Below is a complete stepbystep walkthrough of how to purchase your bonus points in Arizona, which will help make this process much easier to navigate. Use the Arizona bonus tax calculator to determine how much tax will be withheld from your bonus payment using the aggregate method.