Although the top corporate rate is 35 percent, hardly any company really pays that. In fact, 18 of the Fortune 500 paid zero income tax from 2008 through 2015 after using an array of tax loopholes and aggressive strategies. Many more paid zero in at least one year.

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Complaining that the United States has one of the world’s highest corporate tax levels, President Donald Trump and congressional Republicans have repeatedly vowed to shrink it.

Yet if the level is so high, why have so many companies’ income-tax bills added up to zero?

That’s what a new analysis of 258 profitable Fortune 500 companies that earned more than $3.8 trillion in profits showed.

Although the top corporate rate is 35 percent, hardly any company actually pays that. The report, by the Institute on Taxation and Economic Policy, a left-leaning research group in Washington, D.C., found that 100 of them — nearly 40 percent — paid no taxes in at least one year between 2008 and 2015.

Eighteen, including General Electric, International Paper, and PG&E, incurred a total federal income-tax bill of less than zero over the entire eight-year period — meaning they received rebates. The institute used the companies’ own regulatory filings to compute their tax rates.

Q: How does a billion-dollar company pay no taxes?

A: Companies take advantage of an array of tax loopholes and aggressive strategies that enable them to legally avoid paying what they owe. The institute’s report cites these examples:

Multinational corporations like Apple, Microsoft, Abbott Laboratories and Coca-Cola have ways of booking profits overseas, out of the reach of the IRS. (Those companies were not among the 258 whose rates were calculated by the institute, which said it could not verify the breakdown of their profits between the United States and other countries.)

Others, like American Electric Power, Con Ed and Comcast, qualified for accelerated depreciation, enabling them to write off most of the cost of equipment and machinery before it wore out.

Facebook, Aetna and Exxon Mobil, among others, saved billions in taxes by giving options to top executives to buy stock in the future at a discount. The companies then get to deduct their huge payouts as a loss.

Facebook used excess tax benefits from stock options to reduce its federal and state taxes by $5.78 billion from 2010 to 2015, the institute found.

Individual industries have successfully lobbied for specific tax breaks that function as subsidies: for instance, drilling for gas and oil, building NASCAR racetracks or railroad tracks, roasting coffee, undertaking certain kinds of research, producing ethanol or making movies (which saved the Walt Disney Co. $1.48 billion over eight years, the report says).

Q: Why do some industries make out better than others?

A: These industry-specific subsidies mean that the goodies were not evenly distributed. Utilities logged an effective tax rate of just 3.1 percent over the eight-year period. Industrial machinery, telecommunications and oil, gas and pipeline companies paid roughly 11.5 percent. Internet services paid 15.6 percent.

In just two sectors — health care and retail — companies paid more than 30 percent of their profits in federal income tax.

“One of the things that jumps out pretty starkly is there’s a real gap between the tax rates paid by different industries,” said Matthew Gardner, a senior fellow at the institute and a co-author of the study. “When the biggest companies aren’t paying their fair share, that means the rest of us are left to pick up the slack. It means small business and middle-income families are paying more.”

Tax reformers have long argued that the nominal 35 percent federal rate on corporate profits more often than not functions like a strike-through price — an artificially inflated number that sounds high but rarely applies. Thanks to a variety of loopholes and tax-dodging methods, those 258 corporations paid an average rate of 21.2 percent. (Other studies, including a new one by the Congressional Budget Office that compares corporate income tax rates in various countries, have found that average and effective U.S. rates are lower than the nominal rate.)

Q: Who are the biggest beneficiaries?

A: Companies with the biggest tax subsidies over the eight years, the institute’s report said, included:

— AT&T ($38.1 billion) — Wells Fargo ($31.4 billion) — JPMorgan Chase ($22.2 billion) — Verizon ($21.1 billion) — IBM ($17.8 billion) — General Electric ($15.4 billion) — Exxon Mobil ($12.9 billion) — Boeing ($11.9 billion) — Procter & Gamble ($8.5 billion) — Twenty-First Century Fox ($7.6 billion) — Time Warner ($6.7 billion) — Goldman Sachs ($5.5 billion)

Republicans say their tax overhaul will eliminate some of the biggest loopholes, although critics counter that the substitute will end up further reducing companies’ tax bills.