Republican legislation in the House to repeal the federal estate tax would add nearly $270 billion to federal deficits, according to the nonpartisan Congressional Budget Office (CBO).

The office projects the legislation offered by Rep. 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) would result in revenue losses starting in 2016. The CBO and the Joint Committee on Taxation produced the score.

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The House Ways and Means Committee advanced the bill in late March, which would amend the tax code to repeal the tax that applies to estates of the deceased. It would also repeal a generation-skipping transfer tax and lower the top marginal gift tax rate from 40 percent to 35 percent.

Under the estate tax, which has a top rate of 40 percent, individuals are exempt if their assets total less than $5.43 million. For married couples, the threshold for avoiding the tax is $10.86 million.

Republicans have been rallying for a repeal of the estate tax, dubbing it the “death tax.”

Sen. John Thune John Randolph ThuneWhat Senate Republicans have said about election-year Supreme Court vacancies The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump contradicts CDC director on vaccine, masks MORE (R-S.D.) has offered a bill that would repeal the estate tax. More than two-dozen Senate Republicans have already endorsed it, including Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE (R-Ky.).

"It is the federal government’s final insult to tax your family when you have already paid taxes on your property throughout your life," McConnell said. "The thought of having to visit the IRS and the undertaker on the same day is an absolute outrage."

Before Congress left for its two-week recess last month, most Senate Republicans voted to wrap an amendment from Thune into their budget that would repeal the tax.

The budget is just a policy blueprint, however, and is non-binding.