IRS Form W-4 is completed and submitted to your employer, so they know how much tax to withhold from your pay. Your W-4 can either increase or decrease your take home pay. If you want a bigger refund or smaller balance due at tax time, you’ll have more money withheld and see less take home pay in your paycheck. If you want a bigger paycheck, you’ll have less withheld and have a smaller refund or larger balance due at tax time.