MLS explained: salary cap, SuperDraft and playoffs guide

Major League Soccer is the top division of the professional game in the United States, with member clubs in Canada as well. It was conceived in the wake of the 1994 World Cup and played its inaugural season in 1996. The structural feature that explains almost every one of its unusual rules is the single entity model: the league itself holds player contracts, and owners operate franchises within it rather than running fully independent clubs. Salary budgets, a draft, playoffs and the absence of relegation all follow from that design, borrowed from American team sports.

The salary cap, more accurately a salary budget, is a limited allowance for the senior roster rather than a ban on expensive players. Several deliberate escape valves exist. The Designated Player rule, introduced in 2007 around David Beckham's move to the LA Galaxy and therefore nicknamed the Beckham Rule, lets a restricted number of players count against the budget at only a fraction of their true wage, with the ownership group covering the rest. Allocation funds and dedicated slots for young signings work in a similar direction, and the league revises the details regularly.

Building an MLS squad is therefore partly an accounting exercise. There are budget and off budget roster spots, a limit on international players per club, a Homegrown mechanism for academy graduates and allocation money that functions almost as internal currency. Because contracts sit with the league, moves between MLS clubs run through league mechanisms rather than a simple transfer fee. The practical lesson for any reader is that the concepts are stable while the figures are not: check the current roster rules before quoting a number.

The SuperDraft is the recruitment ritual inherited from American college sport, with clubs selecting players, generally in reverse order of the previous standings. For a long stretch it was the main entry route into the league. Its weight has fallen sharply as clubs built academies, began signing Homegrown players without spending a pick and developed talent in affiliated competitions. Today the draft is a secondary tool inside a pyramid that increasingly resembles the youth development model familiar to English clubs, where the academy, not a lottery, feeds the first team.

The regular season is split into Eastern and Western Conferences. The best overall record earns the Supporters' Shield, a trophy for consistency, while the championship the league treats as its main prize is MLS Cup, settled through knockout playoffs. The postseason format has been changed repeatedly, with two legged ties, single matches, short series and different numbers of qualifiers at various points. The final is a one off game, usually staged at the home of whichever finalist finished higher in the regular season, so hosting is earned rather than neutral.

The rationale is competitive balance and protection of investment. Without relegation an owner cannot lose the value of the franchise through one poor campaign, and the league grows by admitting new clubs that pay to join, not by sporting promotion. That is the opposite of the English pyramid, where the drop is the sport's most powerful economic threat and its most compelling storyline. American sport treats a closed league as a feature, using drafts, budgets and talent distribution rules to keep the field level instead.

Three misreadings recur. First, assuming the cap prevents marquee signings: the exceptions were written precisely to allow them. Second, conflating the trophies, since the Supporters' Shield rewards the long haul and MLS Cup crowns the champion. Third, treating the rulebook as fixed, when the league reviews roster regulations frequently and has debated even the shape of its calendar, traditionally played inside a single year rather than across an August to May season. Learn the concepts here, then verify the current numbers in the league's published rules.