The injured list is baseball’s most-used roster tool – and one of its most misunderstood. An IL placement isn’t just “he’s hurt”: it’s a transaction that opens a roster spot, starts a clock, and sometimes (on the 60-day list) trades two months of a player’s season for a 40-man opening.
Four lists, four sets of rules: 10-day for position players, 15-day for pitchers, 60-day for the long haul, 7-day for concussions. Here’s how each works, what rehab assignments allow, and where the strategic games get played.
MLB ROSTER RULES
MLB Injured List Rules
Four lists, four clocks – and the roster math behind each
POSITION PLAYERS
10-day IL
The minimum stay for everyday players
PITCHERS
15-day IL
Longer minimum to stop rotation gaming
LONG-TERM
60-day IL
Frees a 40-man spot – and locks the player out two months
HEAD INJURIES
7-day IL
A shorter concussion-specific list
The four injured lists
Minimums, roster effects and the fine print
| List |
How it works |
| 10-day IL (position players) |
The standard list for hitters: out a minimum of 10 days, replaceable on the 26-man immediately, no 40-man effect |
| 15-day IL (pitchers and two-way players) |
Same mechanics with a longer minimum – lengthened in 2022 specifically to stop clubs from cycling fresh arms through phantom 10-day stints |
| 60-day IL |
The long-term list: the player comes OFF the 40-man roster (opening a spot) but cannot return for at least 60 days – a real trade-off, used for season-enders and roster crunches |
| 7-day concussion IL |
A shorter list exclusively for head injuries, designed so clubs don’t play concussed players to avoid losing them for 10 |
| Retroactivity |
IL placements can be backdated up to three days to the last game played – shaving real time off the minimum |
Rehab assignments and returns
Getting back is its own rulebook
| Rule |
Detail |
| Rehab clocks |
Position players get up to 20 days in the minors on rehab; pitchers get up to 30 – without using an option |
| The return decision |
When the rehab clock expires, the club must activate the player, option him (if he has options), or find another move – the clock forces the call |
| IL stints don’t stop pay or service |
Injured players earn full salary and full service time – the IL is a roster tool, not a penalty |
| The 60-day trap |
Transferring a player to the 60-day IL to clear a September 40-man spot means he’s done until the 60 days run – even if he heals in 30 |
IL FACTS
The IL is roster oxygen
Every placement opens a 26-man spot the same day – half of September’s transaction wire is IL moves creating room for call-ups.
Why pitchers wait 15
The 2022 change killed the phantom-IL rotation trick: with a 15-day minimum, stashing a healthy starter costs a real turn through the rotation.
Watch the retroactive dates
A backdated placement can mean a return up to three days sooner than the announcement suggests – the transaction log tells the truth.
The Lists, and What Each Costs
The short lists (10 and 15 day) are simple: the player vacates his 26-man roster spot, a replacement comes up, and he returns when healthy and the minimum has run. The 60-day list is the strategic one – it’s the only IL that touches the 40-man roster, opening a Reserve List spot clubs desperately need at protection time and in September. The price is rigid: 60 days minimum, healed or not. That trade-off is why you’ll see clubs leave a clearly done-for-the-year player on the 15-day list for weeks – they’re saving the 60-day transfer for the moment they actually need the spot.
Rehab: The Return Runway
Rehab assignments let injured players face live pitching in the minors without burning options: 20 days for hitters, 30 for pitchers. The expiring clock forces a decision – activate, option or move on – which is why rehab-start counts are the best tea leaves for a return date. During September’s roster churn, IL activations and placements drive half the moves you’ll see in our September call-ups tracker.
Quick Answers
Do IL stints count against salary or service time?
No – full pay, full service. The IL protects players as much as clubs.
Can a team IL a player who isn’t really hurt?
Officially placements require a medical basis; practically, the 2022 pitcher change to 15 days exists because the league concluded the answer had become “yes.”
What’s the difference between the 60-day IL and a DFA?
Both open a 40-man spot – but the 60-day IL keeps the player in the organization at full pay, while a DFA risks losing him entirely.
The Bottom Line
The IL is four clocks: 10, 15, 60 and 7 days, each opening roster room at a different price. Read placements as transactions, not just injury news – the list chosen and the date backdated tell you what the club is really managing.
