Guest Essay
Sept. 30, 2025

Mr. Rattner, a contributing Opinion writer, served as counselor to the Treasury secretary in the Obama administration.
All the political skirmishing around the looming government shutdown has obscured the critical reason for it in the first place: Republicans have essentially stopped saying they want to repeal Obamacare, but quietly, they are doing exactly that.
Over the past nine months, Republicans have gone a long way toward dismantling key Obamacare provisions under the misleading guise of reforming or improving our health care system. As a result, more than 20 million Americans face higher insurance premiums next year. And almost 14 million Americans could lose their health insurance altogether over the next decade — an estimated 3.3 million in 2026 alone.
That’s more than 70 percent of those who gained coverage since Obamacare went into effect.
You may be forgiven for missing this headline. There wasn’t one. In 2016, Donald Trump ran on a promise to abolish the program and kept up his crusade throughout his first term, only to have the effort deep-sixed by Senator John McCain. This time around, Mr. Trump has rarely — if ever — mentioned the Affordable Care Act by name. Nor have his fellow Republicans.
But they never stopped trying. And this year they have made substantial progress. The outcome of the looming shutdown will determine whether Democrats can gain back at least a modicum of ground.
Without a deal, the number of uninsured Americans will rise
50 million
Projected
Obamacare enhanced tax credit expiration
40
2025 Trump tax law
changes to Obamacare and other
30
2025 Trump tax law changes to Medicaid
20
10
2015
2025
2010
2020
2030
2035
Health care spending cuts by provision
Repeal of rules simplifying eligibility and renewal
Work requirements
26%
10%
Increased difficulty for states to fund Medicaid
15%
More frequent Medicaid eligibility checks
Lower provider payment limits
Expiration of Obamacare enhanced tax credit
12%
27%
5%
Other
5%
Without a deal, the number of uninsured Americans will rise
Health care spending cuts by provision
50 million
Repeal of rules simplifying eligibility and renewal
Work requirements
26%
Projected
Obamacare enhanced tax credit expiration
10%
40
Increased difficulty for states to fund Medicaid
2025 Trump tax law changes to Obamacare and other
15%
30
2025 Trump tax law changes to Medicaid
Lower provider payment limits
Expiration of Obamacare enhanced tax credit
20
12%
27%
10
More frequent Medicaid eligibility checks
5%
Other
5%
2015
2025
2010
2020
2030
2035
Since most of its provisions went into effect in 2014, Obamacare has been stunningly successful at reducing the ranks of the uninsured: from 44.4 million in 2013 to 26.7 million in 2016.
Then three months ago, Congress passed its huge tax and spending package (known as the One Big Beautiful Bill). Tucked into that legislation were a number of granular, difficult-to-comprehend changes to the government piece of our health care system, particularly Medicaid.
One of them, a work requirement for able-bodied adults, is likely to strip health care coverage from millions of Americans who lack the resources to navigate government bureaucracy. According to the Congressional Budget Office, over the next 10 years, that provision will cost 5.3 million people their coverage.
Other changes were so obscure that only dogged health care aficionados can understand them.
Today Americans making less than $150,000 a year who bought insurance on one of the Affordable Care Act’s exchanges can receive a tax credit to offset part of the cost of their coverage. Republicans chose not to extend that tax break in the tax and spending bill. Now, without government intervention, it will expire at the end of the year. That could be responsible for more than a quarter of the lost coverage, and it’s likely to be the focal point of any negotiations during a possible shutdown.
Percentage of income paid for a benchmark marketplace plan
For the average 60-year-old in 2024
20% of income
subsidy cliff
Original tax credit
15
10
Enhanced tax credit
5
$20K
$40K
$60K
$80K
$100K
$120K
$140K
Annual income
Obamacare enrollment by income level
20 million
15
Above 400%
10
250-400%
5
Enrollees earning up to 250% of the federal poverty level
2018
2019
2020
2021
2022
2023
2024
Percentage of income paid for a benchmark marketplace plan
Obamacare enrollment by income level
For the average 60-year-old in 2024
20 million
20% of income
subsidy cliff
Original tax credit
15
15
Above 400%
10
10
250-400%
Enhanced tax credit
5
5
Enrollees earning up to 250% of the federal poverty level
$20K
$40K
$60K
$80K
$100K
$120K
$140K
2018
2019
2020
2021
2022
2023
2024
Annual income
Passed during the Biden administration, this tax break has helped many of the 24 million Americans who purchased their insurance through the exchanges in two ways. It has slashed existing premiums for lower-income Americans. Plus, it has capped premiums for those earning from just above $60,000 to $150,000 annually — a group that under the prior system suffered a huge premium jump — at 8.5 percent of income.
Not surprisingly, people rushed to take advantage of this new benefit; more than 19 million now receive the tax break, up from 10 million before the enhancement.
How Much More?
Distribution of proposed 2026 premium rate changes among 312 Obamacare insurers
Arkansas has the four highest proposed increases, with all above 54%
50% proposed premium increase
40%
New York’s UnitedHealth Group plan has a proposed increase of 37%
30%
The average proposed rate change is 18%
20%
10%
-10%
Annual premium payment for a benchmark Obamacare plan
For the average 55-year-old couple making $85,000
$3,743
additional payment if premiums increase
$20K
$13,567
premium tax credit
$20,792 premium payment
$10K
$7,225 premium payment
2025
2026
if enhanced tax credits expire
Annual premium payment for a benchmark Obamacare plan
Distribution of proposed 2026 premium rate changes among 312 Obamacare insurers
For the average 55-year-old couple making $85,000
Arkansas has the four highest proposed increases, with all above 54%
$3,743
additional payment if premiums increase
50% proposed premium increase
$20K
40%
New York’s UnitedHealth Group plan has a proposed increase of 37%
$13,567
premium tax credit
30%
$20,792 premium payment
The average proposed rate change is 18%
$10K
20%
$7,225 premium payment
10%
2026
if enhanced tax credits expire
2025
-10%
Even upper-income Americans who buy insurance on the Affordable Care Act exchanges will be hurt by the repeal of this tax break. That’s because as coverage gets more expensive, healthier people drop their insurance first, forcing companies to raise premiums on their remaining customers to maintain profitability.
And those increases will be big. Premiums are expected to soar an additional 18 percent, based on the planned rate increases insurers have filed (assuming the loss of the break). That compares with a 7 percent increase imposed a year ago.
Thanks to Republican legislators, a 55-year-old couple making $85,000 annually could see their health insurance cost more than triple, to $24,535 a year. Obviously that’s unaffordable, which is why so many will drop coverage.
And that will just add to the tragedy of tens of millions of Americans lacking what should be a basic benefit in the richest country in the world. Whether you agree with a shutdown or not, it’s good to understand that it’s not over nothing.