That is not what Kenneth E. Thorpe from Emory University discovered, he has been working on this for over a decade in Vermont.
Allies of the Medicare for All plan correctly points out there would be savings from the
approach for families from out of pocket health care costs. Certainly not paying premiums or a
deductible or a copayment would save many families money. We estimate that would average
over $2 trillion per year over the next ten years. However, taxes would have to be increased by an
average of $3.2 trillion over the same period. A Medicare for All plan would create enormous
winners and losers that have not been discussed in the debate. My recent analysis compares
the dollars savings households with private health insurance would receive through the
elimination of premiums and cost sharing to the new federal taxes they would pay to fund the
program. The analysis shows that 71 percent of households with private insurance today would
pay more in new taxes than they would save through the elimination of premiums and cost
sharing.
For example, two-thirds of workers in small firms under 50 would pay more in taxes under a
Medicare for All plan than they would save in the elimination of premiums and cost sharing.
The tax increases would also hit the middle class. Two-thirds of families of 4 earning $50,000 to
$75,000 would pay more in taxes than they would save through a Medicare for All plan. Overall
over 10 million households earning between 200 and 300 percent of poverty would pay more in
taxes than they would save through the elimination of premiums and cost sharing. Overall
nearly 70 million households would pay more in higher taxes than they would save under
Medicare for All.
https://www.sph.emory.edu/departments/hpm/_page-content/The-Disruptive-Distributional-Impacts.pdf
Edit: Washington Post has a compilation video of Warren dodging the question about Middle Class taxes.
https://www.youtube.com/watch?v=ZraWUtBybV0