Many tax professionals and advisors recommend adjusting your w-4 allowances so

Each time some of us earn income, we are likely to generate taxes, and the amount of taxes payable is determined by Form W-4. The W-4 form works very well if we are common contributors who have our work and always collect a sum of money. The problem comes when we do not get the income this way, therefore, we are likely to have very or very few taxes withheld. The importance of updating the W-4 regularly is the key to paying the correct taxes. If you get a large amount of money each year, you should pay attention to the amount we have, because that amount affects your refund.

Adjusting your W-4 tax allowance so that you will have the right amount of tax withheld so that you can also get the proper amount of tax refund when you file. This is extremely important if you are employed because one of the deductions that will be decreased from your salary would be withholding tax.