Congress made contractors buy payment bonds for subcontractors

On a private construction project, a subcontractor or supplier who went unpaid could file a mechanic's lien against the property itself, giving them a legal claim that had to be resolved before the owner could sell or refinance the building — real leverage that made contractors pay their subs.

Congress had tried to address the gap once before, passing the Heard Act in 1894 to require federal contractors to post some form of payment security, but the law was riddled with procedural traps — ambiguous filing deadlines, unclear rules about who could actually sue on the bond — that let legitimate subcontractor claims lapse or fail on technicalities Congress had never intended.

Required contractors to post a private payment bond before winning the contract, giving subcontractors a direct claim and sidestepping sovereign immunity.

The bond existed before work began, so subcontractors had security from day one.

The surety assessed the contractor's risk, shifting the burden of vetting to a private party.

Subcontractors could sue the bond directly, bypassing sovereign immunity entirely.

Clearer rules in the Miller Act avoided the procedural traps of the Heard Act.

When a protected party can't touch the risk-holder's assets, force an intermediary to post a private guarantee that delivers the same protection without waiving immunity.

The payment bond gave subcontractors the practical equivalent of a mechanic's lien — a guaranteed pool of money they could claim against if a contractor failed to pay them — without the government ever having to waive sovereign immunity or expose its own property to private claims. The clearer procedural rules fixed the technical traps that had undermined the Heard Act, giving legitimate claims a workable path to actual payment.