I see what you are referring to now. So, what's happening here is that these two documents are actually referring to two separate numbers. The "Guide to Withholding" is referring to your actual wages and the Tax Table / Brackets are referring to taxable income.
First, think of withholding as a prepaid, minimum amount of tax that the state collects during the year. There are a lot of variables to how much withholding you have during the year and it doesn't equal tax due on your income tax form (there are also a lot of variables that affect your tax return calculation).
But - simple example - if your wages were $50,000 - then the Withholding guide recommends withholding $2,372.43 (using your calc above). But, your taxable income isn't going to be $50,000. Let's keep it simple and say you have no adjustments or credits and are using the standard deduction. Idaho allows $12,000 for a single taxpayer - so your taxable income is actually only $38,000 - not $50,000. The tax table shows a tax due of 2,374.00 on this amount. When you have additional credits, adjustments etc - it helps give you a refund because you get that withholding back because your taxable income will be less or it will wipe out the tax due.
