Today, Vermont Senator Bernie Sanders is unveiling his legislation for a single-payer healthcare system. Here is what you should know about single-payer systems and Sanders’s proposal:

What is single-payer healthcare?

In a single-payer healthcare system, the government pays for all medically necessary service for of all citizens, regardless of e or ability to pay.

Does the U.S. have a single-payer system?

In the U.S. most citizens over the age of 65 and people under 65 who have specific disabilities qualify for the single-payer system know as Medicare. The expansion of this single-payer system to all citizens is sometimes referred to as “Medicare for all.”

The state of Vermont also attempted to create a single-payer system but scrapped the idea in 2014. As Sarah Kliff explains, “budget analysts realized Vermont would need an additional $2.5 billion in tax revenue to pay for the system. That would have required raising the payroll tax by 11.5 percent and e tax by 9 percent.”

Isn’t the Affordable Care Act (Obamacare) a single-payer system?

No. Obamacare is an expansion of government requirements to cover previously uninsured people. Obamacare does not collect money that is paid directly to medical providers but instead relies on currently existing private panies.

What is Sander’s single-payer proposal?

Sen. Sanders has introduced the “Expanded & Improved Medicare For All Act.” The purpose of the legislation is “To provide prehensive health insurance coverage for all United States residents, improved health care delivery, and for other purposes.”

Currently, Sanders has 15 Senate Democrats as co-sponsors for the bill.

What benefits would be covered under Sanders’s single-payer plan?

Everyone living in the U.S. would receive by mail a Medicare For All Program Cardafter filling out a 2-page registration form. All medically necessary services would be covered, including at least the following:

(1) Primary care and prevention.

(2) Approved dietary and nutritional therapies.

(3) Inpatient care.

(4) Outpatient care.

(5) Emergency care.

(6) Prescription drugs.

(7) Durable medical equipment.

(8) Long-term care.

(9) Palliative care.

(10) Mental health services.

(11) The full scope of dental services, services, including periodontics, oral surgery, and endodontics, but not including cosmetic dentistry.

(12) Substance abuse treatment services.

(13) Chiropractic services, not including electrical stimulation.

(14) Basic vision care and vision correction (other than laser vision correction for cosmetic purposes).

(15) Hearing services, including coverage of hearing aids.

(16) Podiatric care.

How would the law determine what medical practices qualified and what prices would be paid?

According the bill, the benefits would be available through any licensed health care clinician anywhere in the United States that is legally qualified to provide the benefits.

Additionally, no deductibles, copayments, coinsurance, or other cost-sharing would be imposed with respect to covered benefits.

No institution may be a participating provider unless it is a public or not-for-profit institution. Private physicians, private clinics, and private health care providers would be allowed to continue to operate as private entities, but would be prohibited from being investor owned.

It would be illegal for a private health insurer to sell health insurance coverage that duplicates the benefits provided under this Act. Health insurance coverage would still be legal for additional benefits not covered by this Act, such as for cosmetic surgery or other services and items that are not medically necessary.

Reimbursement fees and salaries would be determined by the government after “close consultation with the National Board of Universal Quality and Access and regional and State directors.” Initially, the current prevailing fees or reimbursement would be the basis for the fee negotiation for all professional services covered under this Act.

The prices to be paid each year under this Act for covered pharmaceuticals, medical supplies, and medically necessary assistive equipment would be negotiated annually by the Program.

How would this program be paid for?

Mostly by increased taxes, though the amounts have not been outlined. The proposed taxes include:

• Increasing personal e taxes on the top 5 percent e earners.

• Instituting a “modest and progressive” excise tax on payroll and self-employment e.

• Instituting a “modest tax” on unearned e.

• Instituting a “small tax” on stock and bond transactions.

How much would Sanders’s Medicare For All plan cost?

The Congressional Budget Office (CBO) hasn’t yet scored the bill, but it is estimated to cost nearly $1.4 trillion a year.

To put that into perspective, that’s more money than bined annual budgets for the Dept. of Agriculture ($133 billion), Dept. of Commerce ($9.28 Billion), Dept. of Defense – military programs ($516 billion), Dept. of Education ($60.2 billion), Dept. of Energy ($26.7 billion), Dept. of Homeland Security ($42 billion), HUD (35.8 billion), Dept. of the Interior ($13.2 billion), Dept. of Justice ($31 billion), Dept. of Labor ($44.8 billion), Dept. of State ($25.4 billion), EPA ($7.65 billion), NASA ($16.9 billion), and all international assistance programs ($23.3 billion).

Also, the total revenue taken in federal taxes is $3.21 trillion a year. To add another $1 trillion—a 31 percent increase—would require raising taxes on nearly every American.

Is there a chance this single-payer bill could e law?

No, at least not while the Republicans control the House, Senate, and the White House. And even if the Democrats were to regain control of Congress in 2018 its unlikely they’d have the votes within their own party to pass the bill.