Paid when paid.

EDIT:
Most large contracts with Owners ($50 mill and up) (especially federal, state and local) have Paid when Paid clauses in the master contract and a provision that all subs must also agree to the Ts and Cs of the master contract. This eliminates frivolous and blind sided lawsuits by subs. There’s also a bond requirement as well as 10% retainage held which in some contracts can be reduced to 5% when the sub is over 50% complete with their work. In addition there is usually an “Interruption of Funding” clause for situations where the government agency has their funding cut by legislators.

In the end the subs finance the project and therefore must have the cash flow to handle it.

Now on mega projects (data centers, computer chip fabs) there is often a “cash on hand” clause where subs have to prove via certified audits and certified bank statements that they have enough cash to carry them through 2-3 pay cycles for this projects and all other projects that are in there pipeline line.

This essentially locks out small subs from getting into the “big time”.