Taxpayers are starting to see bigger paychecks as a result of the new tax law, which Republicans hope will pay off for them in the midterm elections.

Democrats warn that Republicans may be overpromising, and have expressed concerns that a number of taxpayers expecting refunds may instead end up owing the IRS money next year.

The growing paychecks reflect the new withholding guidance issued by the IRS last month following enactment of the tax law. The guidance adjusts the amounts that companies take from their employees' paychecks for federal taxes.

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In most cases, taxpayers will have less money withheld from their paychecks, but the exact size of the boost depends of people’s income and other factors.

Republicans say the increases in people’s after-tax incomes are just one sign of the new law’s success. They have attacked House Minority Leader Nancy Pelosi Nancy PelosiPelosi: Ginsburg successor must uphold commitment to 'equality, opportunity and justice for all' Bipartisan praise pours in after Ginsburg's death Pelosi orders Capitol flags at half-staff to honor Ginsburg MORE (D-Calif.) for suggesting that the law is “armageddon” and that bonuses companies have announced are “crumbs.”

“Take home pay is going up, wages are going up, benefits are going up, businesses are expanding,” Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.) said at the recent GOP retreat in West Virginia.

But touting the bigger paychecks comes with some risks for Republicans, too.

Ryan deleted a tweet last weekend that highlighted a $1.50 weekly paycheck gain for a high school secretary in Pennsylvania, which Democrats used to bolster their arguments that the tax law is mostly helping the rich.

“The American people are being bamboozled by rhetoric that doesn’t match the reality,” said Rep. Brian Higgins Brian HigginsBiden slams Trump for promoting conspiracy theory about man shoved by police Trump claims 75-year-old man shoved by Buffalo police could be part of 'set up' NY, NJ lawmakers call for more aid to help fight coronavirus MORE (D-N.Y.), a member of the House Ways and Means Committee. “The reality is that this tax cut disproportionately, clearly, unequivocally, benefits the very, very, wealthy. And this is a continuing ploy, scheme, scam on the part of House Republican leadership to deliberately mislead people into believing that these tax cuts will go toward middle America.”

When asked about the tweet on Thursday, Ryan laughed and shifted to talking about how the legislation is helping people.

“You know what I know, the average family of four in America is getting a $2,000 tax cut,” he said. “You know what I know, we’ve got billions of dollars that are going into bonuses.”

Key Democrats have raised concerns that Trump administration officials may have put political pressure on the IRS to update the withholding tables so that people see bigger boosts to their paychecks ahead of the midterms than is appropriate.

Senate Finance Committee ranking member Ron Wyden Ronald (Ron) Lee WydenGOP senator blocks Schumer resolution aimed at Biden probe as tensions run high Republican Senators raise concerns over Oracle-TikTok deal Hillicon Valley: TikTok, Oracle seek Trump's approval as clock winds down | Hackers arrested for allegedly defacing U.S. websites after death of Iranian general | 400K people register to vote on Snapchat MORE (D-Ore.) and House Ways and Means Committee ranking member Richard Neal Richard Edmund NealRep. Cedric Richmond set to join House Ways and Means Committee Coons beats back progressive Senate primary challenger in Delaware Pelosi: House will stay in session until agreement is reached on coronavirus relief MORE (D-Mass.) have asked the Government Accountability Office to take a look at the new withholding tables.

“The real question with respect to withholding is being straight with the American people, and if you play games with this in order to advance a political agenda, [then] Americans get hurt," Wyden said.

Treasury Secretary Steven Mnuchin Steven Terner MnuchinLawmakers fear voter backlash over failure to reach COVID-19 relief deal United Airlines, unions call for six-month extension of government aid House Democrats plan to unveil bill next week to avert shutdown MORE, however, has refuted the notion that the tables were manipulated for political reasons, saying in January that “any claims that we're doing this for political issues are ridiculous.” And House Ways and Means Committee Chairman Kevin Brady Kevin Patrick BradyBusinesses, states pass on Trump payroll tax deferral Trump order on drug prices faces long road to finish line On The Money: US deficit hits trillion amid pandemic | McConnell: Chance for relief deal 'doesn't look that good' | House employees won't have payroll taxes deferred MORE (R-Texas) expressed confidence in the tables’ accuracy.

“[The] Treasury Department started early once the tax reform got to the president’s desk to make sure the tax tables are accurate,” he told reporters Tuesday.

Republicans are hoping that by aggressively touting the benefits of the tax law, they can bolster their chances of keeping their majority in the midterm elections amid President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE’s low approval rating.

The GOP has started to see the tax law become more popular as companies have announced bonuses in the wake of the law’s passage, and lawmakers predict the measure will gain even more support as people see bigger paychecks.

Republicans are calling on the public to look at their paychecks to see their tax cut. Ways and Means Committee Republicans issued a press release last month that shows taxpayers where they can see on their pay stubs they are getting more take-home pay.

“This month you’re beginning to see check your check,” House Majority Leader Kevin McCarthy Kevin Owen McCarthyTrump asked Chamber of Commerce to reconsider Democratic endorsements: report The Hill's Morning Report - Sponsored by The Air Line Pilots Association - White House moves closer to Pelosi on virus relief bill Trump's sharp words put CDC director on hot seat MORE (R-Calif.) said at a news conference Tuesday. “Individuals are getting more in their paychecks simply because [of] the withholding and the tax benefits from the tax bill.”

The IRS updated withholding tables to reflect three main elements of the tax law: lower tax rates, the near doubling of the standard deduction and the repeal of personal exemptions. Mnuchin said about 90 percent of wage earners will see bigger paychecks as a result of the new tables.

Some will see a bigger increase than others.

According to the Urban-Brookings Tax Policy Center, a taxpayer with income of between $48,600 and $86,100 will see an average tax cut for 2018 of $930. That translates to an increase in take-home pay of about $35 per paycheck, if the tax cut is spread out equally among biweekly paychecks.

Those in lower income groups will see less of a tax cut on average, while those in higher income groups on average will see bigger tax cuts.

The IRS expects the percentage of people who get refunds when they file their tax returns to remain about the same under the new law. More than 70 percent of taxpayers have received refunds in recent years.

Tax experts predict that people with simple tax situations won’t run into a situation where they suddenly don’t receive a refund.

But those with more involved returns could find that their end-of-year situation is different because of changes the tax law made to deductions and credits.

“There’s winners and losers under this new legislation,” said Mark Kohler, a certified public accountant, attorney and a senior tax adviser for TaxSlayer.

Withholding is based on taxpayers’ incomes as well as the number of allowances they claim on W-4 forms. Taxpayers claim more allowances, and get less withheld from their paychecks, if they expect to get more benefits from exemptions, deductions and credits.

Taxpayers who claimed a lot of allowances because they benefited greatly from itemized deductions under the old tax law might find that they owe the IRS when they file their 2018 tax returns next year. This may particularly be the case for people who live in high-tax states and relied heavily in the past on the state and local tax deduction, which is capped in the new law at $10,000.

On the other hand, families with children may get the more welcome surprise of a larger than expected refund if too much money is withheld from their paychecks, as the new law increases the child tax credit.

The IRS is planning to release a calculator later this month that will help people figure out if they should adjust their withholding, as well as a new W-4 form that employees use to direct their employers on their withholding. The agency is planning a bigger revamp of the W-4 form for 2019.

Tax professionals are encouraging people — especially those who don’t have simple returns — to look at the calculator, consult with their tax advisers and update their W-4s if appropriate.

“If it’s not simple, don’t guess,” said Cari Weston, director of tax practice and ethics with the American Institute of CPAs.