Quick Summary
ACA affordability for 2027 is 10.22% for plan years beginning in 2027. Applicable large employers can use three IRS safe harbors to test employee contributions for their lowest-cost, minimum-value self-only coverage. At a qualifying $16 hourly rate, the rate of pay example gives a $212.57 monthly contribution ceiling when rounded down. Confirm eligibility, payroll data, and plan terms before setting contributions.
ACA affordability for 2027 is 10.22%, and Louisiana employers planning their next benefits renewal need to translate that percentage into contribution decisions. For an applicable large employer, the right question is whether the lowest-cost, minimum-value self-only coverage meets the relevant affordability rules—not simply whether a renewal spreadsheet looks reasonable.
Set the contribution strategy before open enrollment communications go out. Run the calculation using current payroll information, confirm the plan year, and document the method. This guide explains the three employer safe harbors and a practical hourly-pay example. Guidance reviewed November 5, 2026; confirm annual IRS updates before using the figures for another plan year.
The 2027 Number and How It Compares
The IRS set the 2027 required contribution percentage at 10.22% in Revenue Procedure 2026-26. The comparable 2026 figure is 9.96%, under Revenue Procedure 2025-25. The increase is 0.26 percentage points. Use the plan’s start year, rather than assuming every payroll deduction taken during 2027 uses the same percentage.
| Plan Year Begins | Affordability Percentage |
|---|---|
| 2026 | 9.96% |
| 2027 | 10.22% |
Affordability generally tests the employee’s required contribution for the lowest-cost self-only option that provides minimum value against household income. Employers can use optional safe harbors for employer shared responsibility purposes because they usually do not know household income. Those safe harbors do not determine an employee’s premium tax credit eligibility and are not a general legal cap on all premiums.
Who the Affordability Rule Actually Applies To
The federal employer shared responsibility rules apply to applicable large employers, or ALEs. Generally, ALE status depends on the previous calendar year’s average of at least 50 full-time employees, including full-time equivalent employees. Part-time hours affect that status calculation even though an employer’s payment exposure generally relates to full-time employees.
Related businesses may need to combine their employee counts. Seasonal-worker exceptions and other details can also change the result. Confirm the federal calculation before setting your benefits strategy; a simple headcount or a separate Louisiana employment-law threshold does not answer the ACA question. Our Louisiana payroll and HR compliance guide places this work in the broader compliance calendar.
The Three Safe Harbors and How They Differ
Choose an approach your payroll and benefits teams can administer and document consistently. A safe harbor may be applied to a reasonable employee category, such as a location or hourly group, subject to the IRS rules. Document the category and method rather than switching methods informally after seeing which produces a convenient result.
| Safe Harbor | Income Substitute | Planning Consideration |
|---|---|---|
| Form W-2 | Box 1 wages | Plan the contribution method in advance and reconcile the final wages. |
| Rate of pay | Hourly rate × 130, or qualifying monthly salary | Check wage reductions and the salaried-employee restrictions. |
| Federal poverty level | Applicable single-person poverty guideline ÷ 12 | Confirm the permitted guideline, timing, and location. |
The IRS employer shared responsibility questions and answers explains the safe harbors and their relationship to coverage offers and minimum value. The lowest dollar result is not automatically the best plan design; employee affordability and your benefit budget both matter.
Rate of Pay Safe Harbor Math, with a Worked Example
For an hourly employee, the monthly calculation uses 130 hours multiplied by the lower of the hourly rate at the start of the coverage period or the lowest hourly rate during the calendar month. Apply the 2027 percentage of 10.22%. A wage decrease can therefore reduce the safe-harbor contribution amount even if the original enrollment calculation was correct.
Example: assume the applicable hourly rate remains $16. The calculation is $16 × 130 = $2,080, then $2,080 × 0.1022 = $212.576. Round down to $212.57 per month when setting a cents-based contribution ceiling so the charge does not exceed the exact result. Ordinary rounding to $212.58 would be slightly above it.
For salaried employees, qualifying monthly salary replaces the hourly projection. A reduction in monthly salary can make this safe harbor unavailable. Review the detailed conditions in 26 CFR 54.4980H-5(e)(2) before applying it to wage changes or partial coverage periods.
The W-2 Safe Harbor Requires Advance Planning
This safe harbor uses Form W-2 Box 1 wages, not simply gross pay or the employee’s stated annual salary. Certain payroll deductions can lower Box 1 wages. Final wages are known after year-end, but employers can still design a permitted contribution formula before enrollment and monitor it during the year.
Use a documented approach that meets the consistency and coverage-period rules. Do not assume the W-2 method is a free after-the-fact substitute for any method initially selected. Ask your benefits adviser to review the calculation if pay varies, employment begins midyear, or employee deductions change.
Review your contribution strategy before open enrollment.
What Happens If Your Plan Is Not Affordable
An affordability failure can create exposure under the employer shared responsibility rules when a full-time employee receives a premium tax credit and the other statutory conditions are met. A failed safe harbor does not by itself prove that every employee’s coverage is unaffordable, and it does not automatically create a penalty for the whole workforce.
Keep affordability, minimum value, and the required offer of coverage as separate review items. Employers also need to consider the broader coverage-offer rules, including offers to full-time employees and dependents. Save the payroll inputs, contribution schedules, employee categories, and review notes supporting your decisions.
Why a Higher Threshold Is Not Automatically Good News
A larger percentage gives an employer more room within an affordability test. It does not require higher employee contributions. Compare the employee’s actual monthly cost with the employer budget before passing along a renewal increase.
Evaluate lower-paid employees and different coverage tiers separately. The employer safe-harbor test focuses on self-only coverage, while employees may be choosing family coverage with a different cost. Explain the choices clearly rather than treating the compliance percentage as an employee benefit recommendation.
A Planning Timeline Before Open Enrollment
Start with eligibility and data: confirm ALE status, plan-year dates, coverage options, minimum value, and current payroll rates. Next, compare the safe harbors that suit your employee groups and model proposed contributions. Resolve wage changes and system discrepancies before enrollment materials are finalized.
Then approve the contribution schedule, communicate employee costs, and test the payroll deductions. Monitor changes during the coverage year. For calendar-year 2027 coverage, required Forms 1094-C and 1095-C reporting generally occurs in 2028; confirm the applicable filing and furnishing rules when the IRS publishes the relevant instructions.
Getting Your Payroll and Benefits Data to Agree Before You Calculate
A sound formula still produces an unreliable result if it uses an old wage rate or an incorrect deduction. Reconcile the payroll roster with benefits eligibility and contribution records, assign an owner for each update, and test how changes move between systems.
Our article on benefits management technology and what to automate first explains how to approach that reconciliation. Keep an audit trail for the rate, contribution amount, coverage period, and safe harbor used for each employee group.
Frequently Asked Questions
What Is the ACA Affordability Percentage for 2027?
The percentage is 10.22% for plan years beginning in 2027, compared with 9.96% for plan years beginning in 2026. Employers should apply the percentage for the year their plan begins, including when the plan does not follow the calendar year.
What Are the Three ACA Affordability Safe Harbors?
The three employer safe harbors are Form W-2, rate of pay, and federal poverty level. They use different substitutes for household income to assess affordability for employer shared responsibility purposes. Apply a chosen method consistently within reasonable employee categories and confirm its conditions.
How Does the Rate of Pay Safe Harbor Work?
For an hourly employee, multiply 130 by the lower of the hourly rate at the start of the coverage period or the lowest hourly rate during the month, then apply 10.22% for a 2027 plan year. At $16 per hour, the exact result is $212.576; rounding down gives $212.57 per month. Salaried employees have separate rules.
Am I an Applicable Large Employer?
Generally, an employer is an applicable large employer if it averaged at least 50 full-time employees, including full-time equivalent employees, in the previous calendar year. Related-employer aggregation and seasonal-worker rules can affect that determination. Part-time employees count toward the status calculation through their equivalent hours.
Does a Higher Affordability Percentage Mean I Should Charge Employees More?
No. Meeting an affordability safe harbor is a compliance consideration, not a recommendation to raise contributions. Compare the employee cost, employer budget, coverage value, and your chosen safe harbor before setting the contribution schedule.
The Number Is Set. The Strategy Is Still Yours.
Treat the 10.22% affordability percentage as one input in a deliberate benefits decision. Confirm your ALE status and safe-harbor conditions, test contributions with current wage data, and review employee costs before communicating the renewal. A documented process is easier to maintain when payroll and benefits teams work from the same records.
Start with our guide to benefits management technology to identify gaps between systems, then explore Coeur’s benefits administration services for help organizing your enrollment and contribution workflow.
