As Trump’s payroll tax holiday kicks in, here’s what employers and employees need to know

Employers are down to the wire to decide if they want to opt in to President Trump’s so-called payroll tax holiday, and tax experts note there’s a plethora of possible consequences to deferring the payroll taxes.

Back in early August, Trump issued a memorandum that would allow employers to defer the employee portion of the Social Security tax (that 6.2% per paycheck) for employees making less than $4,000 bi-weekly (or roughly $104,000 per year) from September 1 through December 31 this year. But guidance released by the IRS and Treasury on Friday, just days before the holiday would start taking effect, has many experts skeptical of the scheme.

While not explicitly stated in the guidance, experts believe it’s clear employers will be able to opt out of participating—and that most would indeed skew on the conservative side and do just that.

The upshot is that employees could temporarily see bigger checks for the next four months, and the most an employee could theoretically receive back in their paycheck would be roughly $2,232 spread over those four months—which they would have to pay back next year, likely via higher taxes for the first four months. And in that sense, those like Andre Shevchuck, a tax partner at accounting firm BPM, note it may put employers in between a “rock and a hard place”: “Saying, ‘Well, here’s this opportunity to save a little bit of cash and we’re not going to follow it because it’s complex,’ is not a really good answer,” he tells Fortune. But he argues if the employer is able to explain that the holiday really functions as a “very short term no-interest loan,” most employees would understand it’s likely not worth it, he argues.

Tax experts point out three things for employers to consider now.

It’s likely you’ll get stuck with the bill

While experts are awaiting more guidance on exactly who is on the hook for paying back the taxes, some experts suggest the big risk with participating in the payroll tax holiday is that the employer would get stuck with the bill come next year. While “It’s the employee’s tax, … it’s the employer’s responsibility to collect and remit that tax,” notes Shevchuck.

Ultimately, those like Christopher Moran, an attorney in the labor and employment practice group at Troutman Pepper, say employers need to consider if the benefits outweigh the risks: “Every little bit [for your employees] helps, I know, but is that significant enough to opt in to this administrative scheme?” However, federal employees may not even have the option to opt out, The Washington Post reported Monday, which would mean they could see even higher taxes for the first four months next year.