A salary cap looks like a single number that limits what a team may spend. The rules that decide how each contract is counted matter far more than the number itself.
Cap charge is not the same as cash paid
Leagues count a contract against the cap using an allocation rule, not the check written that year. Signing bonuses are commonly spread across the contract's length rather than charged at once.
A team can therefore pay a large sum in year one while carrying a modest cap charge, provided the money is structured as bonus rather than base salary.
This separation between cash and cap is the single most important concept in roster construction, and it explains contracts that appear larger than a team's capacity.
Guaranteed money creates future obligations
Prorated bonus money already paid remains charged to the team even if the player is released. The unamortized remainder accelerates onto the cap as dead money.
Dead money is payroll spent on players no longer on the roster, and a team carrying a lot of it is effectively competing with fewer usable dollars.
Front offices weigh this when structuring deals, because the same total value can be arranged to make an early exit either affordable or prohibitive.
Restructures move money rather than remove it
A common maneuver converts base salary into signing bonus, which spreads the charge across remaining years and lowers the current-year number immediately.
Nothing is saved. The obligation is pushed into later seasons, where it compounds with whatever new contracts those seasons must also accommodate.
Teams that restructure repeatedly build a payroll with large committed charges and little flexibility, which constrains their options when a roster needs remaking.
Hard and soft caps produce different leagues
A hard cap admits no exceptions, so a team over the limit simply cannot complete a transaction. Roster decisions become arithmetic problems with no escape valve.
A soft cap permits specified exceptions, often including the right to re-sign a team's own players beyond the limit, sometimes with a tax on the excess.
That single design choice changes player movement across an entire sport, because it decides whether incumbency is an advantage in retaining talent.
Floors and revenue links complete the system
Most capped leagues also set a payroll floor, requiring teams to spend a minimum. Without one, a team could pocket shared revenue instead of fielding a competitive roster.
The cap itself is usually tied to league revenue under the collective bargaining agreement, so it rises and falls with the business rather than being set by decree.
When revenue moves sharply, the negotiated smoothing mechanisms determine whether teams face an abrupt adjustment or a gradual one, which shapes an entire offseason.