IDP fantasy football

Lesson 1 of 10

What IDP is, and how many defenders a league starts

IDP stands for individual defensive players. A normal league starts one team defense that scores for the whole unit. An IDP league starts real defenders as well, or instead: defensive linemen, linebackers and defensive backs, each scoring for his own tackles, sacks, passes defended and turnovers.

How many defenders a league starts varies more than any other setting. The IDP Show's 2025 survey of 95,284 leagues found 13.3% ran IDP and another 37.1% ran a lighter version, with 7.04 IDP starters on average. Of the 1811 leagues synced on FF Beacon, 65 start defenders, and the median one of those starts 3.

Lesson 2 of 10

Read your scoring first

Two IDP leagues with the same roster slots can reward completely different players. The table sets four common systems side by side. Sleeper's default pays 2 for a solo tackle and 6 for a sack; Big 3 scoring pays less for tackles and more for a quarterback hit and a pass defended; ESPN and FantasyPros pay 1.5 for a solo tackle, between the two, and less than either for a sack or a pass defended.

The stacking trap

On Sleeper a rule called Tackle adds on top of the solo and assisted tackle rules instead of replacing them. A sack also earns whatever a tackle, a tackle for loss and a quarterback hit are worth, because all four are recorded on the same play. Of our 65 IDP leagues, 27 score the Tackle rule, and 13 of those also score solo tackles, so a solo tackle counts twice there.

Lesson 3 of 10

The same players under four scoring systems

Scoring changes the order of players as well as their totals. Below are real 2025 season stat lines. Watch where the linebackers and the edge rushers land as the price of a tackle, a sack and a quarterback hit changes.

Lesson 4 of 10

Which position runs out first

The question for a draft is how far the twelfth-best player at a position falls behind the best one. In 2025, in Sleeper default IDP scoring, the best linebacker averaged 20.9 points a game and the twelfth 17.0; the best defensive lineman averaged 21.6 points a game and the twelfth 14.8; and the best defensive back averaged 15.5 points a game and the twelfth 13.8.

A position where the twelfth player is close to the first is one you can wait on. A position with a steep drop is where an early pick buys something the waiver wire cannot replace. How steep it is for you depends on how many your league starts, so try your own number.

Lesson 5 of 10

What repeats from one season to the next

A defender's role repeats better than his big plays. The figure measures, for every player with at least eight games in two straight seasons, how closely year one predicted year two. Sports Info Solutions found the same about sacks: a pass rusher's pressures predict next season's sacks better than his sacks do (an R-squared of 0.27 against 0.13).

Two cautions. Tackles are not an official NFL statistic: the home team's stat crew charts them, and crews differ in how often they credit an assist. And the positions above are today's labels applied to past seasons, so a player who moved from safety to linebacker counts as a linebacker in both years.

Lesson 6 of 10

Position labels change value

Sleeper lets some defenders play two positions. Of the 1308 defenders on an NFL roster today, 80 are eligible at both defensive line and linebacker, and 13 at both linebacker and defensive back. An edge rusher listed at both is worth more in a league that starts two linemen and three linebackers, because he fits whichever slot is thin that week.

The label can change during a season. Check it in your league before you trade for a player because of where he is eligible.

Lesson 7 of 10

Drafting defenders

Most IDP leagues start more offensive players than defenders. Lesson 4 shows how far the twelfth defender at each position trails the first; set that against the same gap at your offensive positions before you spend an early pick on a defender.

Where defenders go in real drafts

Sleeper publishes an average draft position for IDP drafts: one figure for one-quarterback leagues and one for superflex. FF Beacon reads it every morning. As of Oct 27, 2026, counted in 12-team rounds, no defender goes in the first five rounds of one-quarterback or superflex IDP drafts. In one-quarterback IDP drafts the first defender goes in round 6, the twelfth by round 11 and the twenty-fourth by round 13. In superflex IDP drafts, where quarterbacks go earlier, the same three marks come in rounds 7, 11 and 14.

Defensive linemen come off the board first as a group. In the one-quarterback figures the twelfth defensive lineman goes in round 15, the twelfth linebacker goes in round 16 and the twelfth defensive back goes in round 19.

Published advice for comparison. IDP+ tells a 12-team league to start on defenders around round 7 and to take its first defensive backs in rounds 12 to 15. Mike Woellert at Fantasy Life targets his first IDP in the seventh round. Gary Davenport at Footballguys puts the elite defenders between rounds 4 and 6, in a league that starts two at each position. Draft position moves through the summer and changes with league size and scoring, so use these rounds as the shape of the market rather than a pick-by-pick plan.

When you do draft defenders, draft roles: a linebacker who stays on the field on third down, a safety who plays near the line of scrimmage, an edge rusher who plays every down rather than only on passing downs. Box safeties usually outscore free safeties and cornerbacks. The IDP rankings show who holds those roles today.

Lesson 8 of 10

Managing IDP in season

Defenders are streamable in a way quarterbacks are not. A linebacker promoted after an injury ahead of him can start the same week. Every defender's player page shows his snap share, his depth chart spot and his projected line, scored under the system you pick. Jordyn Brooks's page is one to start with. Our IDP rankings list every defensive lineman, linebacker and defensive back by projected points for the rest of the season, with last season's finish beside each name.

In a Sleeper IDP league, League Pulse projects your defenders under your league's own scoring. The Lineups page seats them in the best lineup, the waiver list includes free agent defenders, and Power Pulse and the positional scarcity chart count them.

Lesson 9 of 10

Dynasty IDP

IDP is mostly a dynasty format. In The IDP Show's 2025 survey, 71.1% of IDP managers played it in dynasty leagues. Lesson 5 is the dynasty lesson in short: role and snap share carry over from one season to the next better than a big sack total does.

No value source prices defensive players, so FF Beacon's trade tools grade a trade on its offensive pieces and say how many defenders they left out. Judge the defenders in a deal on role and snap share.

Lesson 10 of 10

Setting up an IDP league

Three starting points, from lightest to heaviest. Add one IDP flex slot to an existing league if your managers are new to defense. Start one lineman, one linebacker, one defensive back and one IDP flex for a balanced league. Start two of each plus two IDP flex slots for a league where defense decides games.

Then set the scoring on purpose. Sleeper's default is a sensible start; if you add the Tackle rule, remember it stacks on solo tackles. Our glossary covers every abbreviation you will meet in the settings.

Questions, answered

Sources

• Sleeper default IDP scoring: read from a fresh Sleeper league on 2026-09-23. Sleeper scoring options, what stacks, stat corrections.
• Big 3 scoring, FantasyPros scoring settings, ESPN IDP scoring.
• The IDP Show, 2025 State of IDP report.
• Sports Info Solutions on projecting sacks.
• Sports Illustrated on how tackles are recorded.
• Sleeper IDP average draft position, one-quarterback and superflex, read from Sleeper's projections data every morning; the figures above are from Oct 27, 2026.
• IDP+, 2026 IDP draft strategy guide, Fantasy Life, 2026 IDP strategy guide, Footballguys, 2026 IDP draft blueprint.
• League counts, stat lines and year-to-year figures: FF Beacon's synced leagues and weekly stats, read when this page loads.