*Counting convention used in this guide: The hire date counts as day 0. "30 days after hire date" means hire date + 30 calendar days.
*Example hire dates used throughout: May 11 (5/11) and January 30 (1/30). Non-leap year assumed unless noted.
Option 1: Start immediately
Definition: Coverage is effective on the hire date itself. No waiting period.
Hire Date | Coverage Effective Date | Waiting Period |
|---|---|---|
5/11 | 5/11 | 0 days |
1/30 | 1/30 | 0 days |
Option 2: 1 day after hire date
Definition: Coverage begins the day after the hire date.
Hire Date | Math | Coverage Effective Date |
|---|---|---|
5/11 | 5/11 + 1 day | 5/12 |
1/30 | 1/30 + 1 day | 1/31 |
Edge case: If hired on the last day of a month (e.g., 1/31), coverage starts the 1st of the next month (2/1) — simply because that's the next calendar day, not because of any "first of month" rule.
Option 3: 30 days after hire date
Definition: Coverage begins exactly 30 calendar days after the hire date. The effective date can land on any day of the month.
Hire Date | Math | Coverage Effective Date |
|---|---|---|
5/11 | 5/11 + 30 days → 20 days left in May (5/12–5/31) + 10 days into June | 6/10 |
1/30 | 1/30 + 30 days → 1 day left in Jan (1/31) + 28 days of Feb + 1 day into March | 3/1 |
Edge case — leap year: For a 1/30 hire in a leap year, February has 29 days, so day 30 lands on 2/29 instead of 3/1. Calendar-day math shifts depending on month lengths — 30 days is not the same as "one month."
Option 4: 60 days after hire date
Definition: Coverage begins exactly 60 calendar days after the hire date.
Hire Date | Math | Coverage Effective Date |
|---|---|---|
5/11 | 5/11 + 60 days → 20 days left in May + 30 days of June + 10 days into July | 7/10 |
1/30 | 1/30 + 60 days → 1 day (1/31) + 28 days (Feb) + 31 days (3/1–3/31) | 3/31 |
Edge case — leap year: 1/30 + 60 days = 3/30 in a leap year (the extra Feb day pulls everything back one).
Option 5: 90 days after hire date
Definition: Coverage begins exactly 90 calendar days after the hire date.
Hire Date | Math | Coverage Effective Date |
|---|---|---|
5/11 | 5/11 + 90 days → 20 (May) + 30 (June) + 31 (July, day 81 = 7/31) + 9 days into Aug | 8/9 |
1/30 | 1/30 + 90 days → day 60 = 3/31, + 30 more days into April | 4/30 |
Edge case — leap year: 1/30 + 90 days = 4/29 in a leap year.
Compliance note: 90 calendar days is generally the maximum waiting period allowed under the ACA for applicable employers. "90 days after hire date" sits right at that limit.
Option 6: First of the month after hire date
Definition: Coverage begins on the 1st of the month following the hire date. Everyone hired in the same month gets the same effective date.
Hire Date | Math | Coverage Effective Date | Actual Wait |
|---|---|---|---|
5/11 | Next 1st after 5/11 | 6/1 | 21 days |
1/30 | Next 1st after 1/30 | 2/1 | 2 days |
Notice how uneven the actual wait is: someone hired 5/2 waits ~30 days, while someone hired 5/31 waits 1 day.
Edge case — hired on the 1st: Hire 5/1 → effective 6/1
Option 7: First of the month after 30 days
Definition: Two steps (1) add 30 calendar days to the hire date, then (2) coverage begins on the 1st of the month following that date.
Hire Date | Step 1: +30 days | Step 2: Next 1st | Coverage Effective Date | Actual Wait |
|---|---|---|---|---|
5/11 | 6/10 | 1st after 6/10 | 7/1 | 51 days |
1/30 | 3/1 | 1st after 3/1 | 4/1 | 61 days |
Edge case — day 30 lands exactly on the 1st: For a 1/30 hire, day 30 is 3/1. Some carriers say coverage starts 3/1 (it's already a first of the month, and the 30 days are complete); a strict "first of the month after 30 days" reading gives 4/1.
Edge case — leap year: 1/30 + 30 = 2/29, so the next 1st is unambiguously 3/1. The leap day actually removes the ambiguity.
Option 8: First of the month after 60 days
Definition: Add 60 calendar days to the hire date, then coverage begins on the 1st of the following month.
Hire Date | Step 1: +60 days | Step 2: Next 1st | Coverage Effective Date | Actual Wait |
|---|---|---|---|---|
5/11 | 7/10 | 1st after 7/10 | 8/1 | 82 days |
1/30 | 3/31 | 1st after 3/31 | 4/1 | 61 days |
Edge case — leap year: 1/30 + 60 = 3/30 in a leap year; next 1st is still 4/1, so the effective date doesn't change here even though the intermediate date does.
Key Takeaways
"X days after hire date" = exact calendar-day math; effective dates land mid-month.
"First of the month after X days" = calendar-day math then round up to the next 1st.
Month lengths matter. "30 days" ≠ "1 month" — a 1/30 hire crosses short February and produces different results in leap years.