The 2027 ACA affordability percentage gives employers more room to charge for employee coverage. It does not make every contribution schedule affordable.
IRS Revenue Procedure 2026 26 sets the required contribution percentage at 10.22 percent for plan years beginning in 2027. The 2026 figure is 9.96 percent. A company can use that percentage with one of three employer safe harbors: federal poverty line, rate of pay, or Form W 2 wages.
The choice changes the answer. It also changes how much employee data payroll must control.
The 2027 number employers can use now
| Measure | 2026 | 2027 | Change |
|---|---|---|---|
| ACA affordability percentage | 9.96% | 10.22% | 0.26 percentage points |
| Mainland federal poverty line | $15,650 | $15,960 | $310 |
| Monthly federal poverty line ceiling | $129.90 | $135.93 | $6.03 |
| Annual employee charge at that ceiling | $1,558.80 | $1,631.16 | $72.36 |
The 2027 percentage appears in the Internal Revenue Bulletin. The 2026 mainland poverty guideline for one person is $15,960. Multiply that by 10.22 percent, divide by 12, and the monthly result is $135.93 after rounding.
That $135.93 figure is useful because a calendar year employer can apply it to all eligible full time employees in the mainland United States without calculating each person’s pay. Alaska and Hawaii use different poverty guidelines, so their monthly ceilings are different.
The extra room is only $6.03 a month
The percentage rose from 9.96 to 10.22, but the practical increase under the mainland poverty line method is modest. An employer that charged $129.90 a month in 2026 can charge no more than $6.03 extra in 2027 if it wants the same safe harbor.
For 500 enrolled employees, raising the employee charge by the full $6.03 would shift $36,180 a year from the employer to employees. The calculation is 500 times $6.03 times 12.
That amount may help a budget. It will not absorb a large renewal. If the lowest cost self only premium rises $45 a month and the employer passes through only the allowable $6.03, the employer absorbs the remaining $38.97 per enrolled employee each month. Across 500 employees, that is $233,820 a year.
This is the gap most limit announcements miss. A higher affordability percentage loosens the employee cap slightly. It does not track the full medical renewal.
How the three safe harbors differ
Federal poverty line
The federal poverty line method is the simplest. For a calendar year plan in the mainland United States, keep the monthly employee contribution for the lowest cost self only option at or below $135.93.
The simplicity can be expensive. A worker earning $60,000 could afford a larger contribution under another safe harbor, yet the poverty line method uses the same ceiling as it does for a worker earning $25,000.
Rate of pay
For an hourly employee, the rate of pay safe harbor generally uses the hourly rate at the start of the coverage period multiplied by 130 hours. At $18 an hour, the monthly base is $2,340. Multiply by 10.22 percent and the affordability ceiling is $239.15.
At $25 an hour, the ceiling becomes $332.15. At $40 an hour, it becomes $531.44. The lowest paid class usually controls the contribution schedule when one rate is applied to everyone.
A pay increase during the year does not automatically let the employer increase the health contribution under this method. A pay decrease can lower the safe amount. Payroll and benefits therefore need a rule for midyear changes.
Form W 2 wages
The Form W 2 method uses Box 1 wages for the year. It can fit salaried workforces, but the final wage figure is not known until the year closes. Unpaid leave, partial year employment, salary reductions, and variable compensation can reduce the base.
An employer using this method should test projected wages during enrollment, then reconcile against actual Box 1 wages. A single annual average is not enough.
A payroll table for common hourly rates
| Hourly rate | Monthly pay base | Maximum monthly employee charge | Maximum per 26 checks |
|---|---|---|---|
| $15 | $1,950 | $199.29 | $91.98 |
| $18 | $2,340 | $239.15 | $110.38 |
| $20 | $2,600 | $265.72 | $122.64 |
| $25 | $3,250 | $332.15 | $153.30 |
| $30 | $3,900 | $398.58 | $183.96 |
The per check figures convert the annual permitted amount to 26 payrolls. They are planning figures, not a substitute for applying the regulations to an employee’s actual facts.
What the federal data adds to the calculation
The Bureau of Labor Statistics reported that private industry employers paid 80 percent of the single coverage premium on average in March 2025, while employees paid 20 percent. That national average cannot prove ACA affordability for any employee.
Combine the BLS share with the IRS ceiling and the reason becomes clear. If a lowest cost self only plan costs $800 a month, a 20 percent employee share is $160. That is below the $239.15 rate of pay ceiling for an $18 hourly worker, but above the $135.93 mainland poverty line ceiling.
The same contribution is affordable under one safe harbor and not under another. A percentage of premium contribution formula may look normal against national benefit data while failing the safe harbor the employer actually selected.
Five checks before open enrollment
- Identify the lowest cost self only plan that provides minimum value for each employee class.
- Choose the safe harbor by reasonable employee category and apply it consistently within that category.
- Test employee payroll deductions, wellness adjustments, flex credits, opt out payments, and relevant HRA amounts together.
- Model new hires, unpaid leave, reduced hours, and pay cuts instead of testing only full year employees.
- Keep the calculation, source data, plan rate sheet, and approval record with the enrollment file.
The IRS explains that affordability uses the lowest cost self only option that provides minimum value and is available to the employee. It does not use the family premium the employee chooses, and an average contribution percentage does not replace the employee level test.
Why calendar and noncalendar plans need separate dates
The 10.22 percent figure applies to plan years beginning in 2027. A calendar year plan uses it on January 1, 2027. A plan beginning October 1, 2026 does not switch percentages on January 1 merely because the calendar changed.
The poverty guideline timing has its own rule. Employers may generally use the poverty guideline in effect within six months before the first day of the plan year. That is why a plan’s effective date must sit next to the percentage and the poverty figure in the calculation file.
The ACA affordability safe harbor guide explains the broader framework. The 50 employee threshold guide covers when the mandate begins, and the Benefits ROI Calculator can help compare the added employer subsidy with workforce costs.
Frequently Asked Questions
What is the ACA affordability percentage for 2027?
The required contribution percentage is 10.22 percent for plan years beginning in 2027. It is up from 9.96 percent for 2026 plan years.
What is the 2027 federal poverty line safe harbor amount?
For a 2027 calendar year plan in the mainland United States, the monthly employee contribution ceiling is $135.93 for the lowest cost self only plan providing minimum value.
Does ACA affordability use the employee only or family premium?
The employer mandate affordability test uses the employee contribution for the lowest cost self only option that provides minimum value and is available to that employee.
What are the three ACA affordability safe harbors?
They are the Form W 2 wages safe harbor, the rate of pay safe harbor, and the federal poverty line safe harbor.
Can an employer use different safe harbors for different workers?
Yes, when the employee categories are reasonable and the selected method is applied uniformly and consistently within each category.
Does a 10.22 percent employee premium always pass?
No. The percentage must be applied to the correct income or safe harbor base. Charging 10.22 percent of the health plan premium is not the affordability test.
Sources
- Internal Revenue Service, Revenue Procedure 2026 26
- Internal Revenue Service, Minimum Value and Affordability
- Internal Revenue Service, Employer Shared Responsibility Questions and Answers
- Bureau of Labor Statistics, Share of Premiums for Single Coverage
Editorial note: This article provides general employer information. ACA affordability depends on plan design, employee facts, payroll treatment, and current guidance. Benefits and tax advisers should review the final contribution schedule.