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Botched Your Tax Withholding in 2018? It's About to Get More Complicated

Workers can anticipate putting in a little more time and effort to fill out the new form, said Pete Isberg, head of government relations at payroll company ADP

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    Botched Your Tax Withholding in 2018? It's About to Get More Complicated
    Joe Raedle/Getty Images
    In this April 14, 2010, file photo, Felipe Castro holds a sign advertising a tax preparation office.

    What to Know

    • The IRS plans to soon release a draft of its new Form W-4, which you will be able to use to adjust your tax withholding for 2020.

    • That new form may require taxpayers to assemble additional pieces of information.

    • If you were unhappy with your 2018 tax return results, now is the time to plan for the remainder of 2019.

    Fine-tuning your tax withholding is about to get a little more complicated.

    The Internal Revenue Service is expected to release a draft of its new Form W-4, the form employees use to adjust the amount of income tax withheld from their pay, by the end of May.

    The draft form, which is expected to be in use for 2020, will be open for comments from the public. It will more closely reflect the changes from the Tax Cuts and Jobs Act.

    This overhaul of the tax law nearly doubled the standard deduction, eliminated personal exemptions and placed limits on certain itemized deductions.

    Last year, the Treasury Department and the IRS updated the withholding tables, incorporating these changes.

    Workers can anticipate putting in a little more time and effort to fill out the new form, said Pete Isberg, head of government relations at payroll company ADP.

    "If you want to get the withholding right, it will work like the tax return itself," he said. "There will be input areas that look more like a 1040 summary than the old Form W-4."

    Get your tax return

    "To get it right, you have to have your last year's tax return," said Isberg.

    He anticipates that in order to fill out the new W-4, employees will need to know their total deductions from the prior year, the tax credits they can expect to claim in the upcoming year, as well as additional sources of household income — including their spouse's earnings.

    "People don't generally remember their total deductions off the top of their head, so it's not going to be super easy to do," Isberg said. "But it's going to be more accurate."

    In general, tax withholding is a balancing act for filers.

    If you withhold far too much, you get a large refund the following year. But you've also given the government an interest-free loan.

    Withhold too little, and you take home more cash in your paycheck. But you may owe the IRS next spring.

    This year marked the first time filers submitted returns under the new tax law, and some wound up with smaller-than-expected refunds. Others owed the tax man.

    "They got more money in their pockets during the year, and they received smaller refunds," said David Desmarais, CPA and member of the American Institute of CPAs' personal financial planning executive committee.

    In all, the IRS issued 101.6 million refunds as of May 10, down about 1% from last year. The average refund check was $2,729, down from $2,778 last year, according to the IRS.

    Prep for 2019

    We're coming up on the halfway mark of 2019, so if you were unhappy with your 2018 return, you're running out of time to avoid a similar outcome next year.

    The IRS is reminding taxpayers to take a closer look at their withholding and ensure they're paying sufficient taxes for 2019.

    "Two-income families and people with multiple jobs may be more vulnerable to being underwithheld or overwithheld following these major law changes," the agency said in a statement.

    Work with your CPA or hash out the details on the online IRS withholding calculator to figure out how much federal income tax to deduct from your pay.

    Here are a few types of taxpayers who should pay close attention to their withholding:

    • W-2 employees with side gigs: Got a side gig or a summer job in addition to your 9-to-5? Odds are that you aren't withholding enough in taxes to cover both streams of income.

    • Former itemizers: Under the old tax law, people who itemized their tax returns may have withheld less tax from their pay.

    However, fewer people are expected to itemize under the new law, so they should review their W-4s. That's because the standard deduction has been nearly doubled to $12,000 for singles and $24,000 for married couples who file jointly (2018).

    • Families with dependents: Previously, it may have made sense for families to have less tax withheld from their pay if they had dependents.

    However, the law has done away with personal and dependent exemptions. It also broadened the applicability of the child tax credit to include higher-income households.

    If you haven't already made these updates to your withholding and you owed taxes in 2018, review your W-4 now.

    • Retirees: You still need to reevaluate your withholding. Use Form W-4V to withhold a flat rate from your Social Security check or Form W-4P to withhold from your pension.

    This story first appeared on CNBC.com. More from CNBC: