More than 420,000 federal employees across numerous agencies will continue to work even if the government shuts down. They just won’t get paid for it immediately.

Democrats on the Senate Appropriations Committee say that number will include more than 41,000 federal law enforcement and correctional officers from the FBI, the Drug Enforcement Agency, the Bureau of Alcohol, Tobacco, Firearms and Explosives, and thousands of other law enforcement and correctional officers.

The vast majority of Department of Homeland Security employees will also work without a regular paycheck. The nearly 90 percent of workers in the agency affected by a shutdown would include 53,000 Transportation Security Administration employees, as well as 42,000 Coast Guard employees.

As many as 54,000 employees from Customs and Border Protection — the agents who are currently working to secure the southern U.S. border — are also projected to work without paychecks. By forcing a shutdown over border security, Trump would cause the agents he often lauds for their efforts to stop illegal immigration to temporarily go without compensation.

Up to 5,000 Forest Service firefighters and 3,600 National Weather Service forecasters will also keep working without paychecks, according to Senate Democrats.

The special counsel’s office, which is investigating potential criminal connections between the Trump campaign and the Kremlin, will continue operating.

Another 380,000 federal workers or more would be placed on temporary leave without receiving pay in the event of a government shutdown, according the Democrats.

Furloughs would affect vast swathes of Department of Commerce and NASA staff. About 41,000 people, or 86 percent, would be furloughed from the Commerce Department, along with a staggering 96 percent of NASA employees.

Four-fifths of the Forest and National Park Services, totaling more than 44,000 employees, would be sidelined, as would approximately 52,000 staff from the IRS, and about 7,100 Housing and Urban Development workers — 95 percent of the total.

Thirty percent of Transportation Department employees, equaling about 18,300, would be furloughed, as well.

All of that lost work could cost taxpayers huge amounts of money. An Office of Management and Budget review of a 2013 government shutdown during the Obama administration concluded that the cost of “the lost productivity of furloughed workers” alone was $2 billion. The cost may not go that high this time with five agencies still running.

That shutdown was one of the longest in U.S. history. A failure to fund the government by midnight Friday would likely create a closure that lasts into the new year, when Democrats take majority control of the House.

Trump himself said in a tweet Friday morning that “if the Dems vote no, there will be a shutdown that will last for a very long time.”

Nine federal departments will be shuttered if the government shuts down this weekend. They are:

• Department of the Treasury
• Department of Agriculture
• Homeland Security Department
• Department of the Interior
• Department of State
• Department of Housing and Urban Development
• Department of Transportation
• Department of Commerce
• Department of Justice

“Dozens” of U.S. agencies will also close down during the shutdown, according to the report from the Senate Democrats. Those closures could lead non-federal employees to feel the impact of the shutdown, as well.

For instance, with thousands of their employees furloughed, national parks are likely to close. In the previous shutdown in January, about one-third of the country’s national parks were closed — even following an agency directive to keep parks open.

U.S. housing authorities are also expected to see significant delays in loan processing and approvals.

Other institutions have announced preparations in the event of a partial shutdown. The Smithsonian said it will be able to use existing funds to keep its 19 museums and national zoo open to the public through Jan. 1.

Smithsonian tweet

The Securities and Exchange Commission said on its website Friday morning that it also “will remain open for a limited number of days, fully staffed and focused on the agency’s mission” if the government shuts down.

A spokesman for the U.S. Trade Representative said it “would be an agency affected by a lapse in appropriations.”

“Essential personnel will be on-duty to ensure USTR continues to conduct all necessary operations, including trade negotiations and enforcement,” the spokesman added.