Subcontractor payment terms set the tone for job cash flow, field trust, and how quickly problems get solved when work slips. Most GCs do not get burned because they wrote one obviously bad clause. They get burned because the payment section was vague, milestones were not documented, or the schedule pushed too much risk onto the trade partner who is supposed to keep showing up.
Good payment terms balance two realities. First, the GC needs to protect cash and avoid paying ahead of actual progress. Second, the subcontractor needs a clear path to getting paid on time for completed work. When one side feels trapped, the relationship usually gets worse before the project gets better.
Start with the four payment structures every GC should understand
| Term | What it means | Best use |
|---|---|---|
| Net-15 | Payment is due fifteen days after invoice approval. | Smaller scopes, fast-moving trades, or when you want to be a preferred GC to work for. |
| Net-30 | Payment is due thirty days after invoice approval. | Common baseline for residential and light commercial work when draws or owner billing cycles are monthly. |
| Pay-when-paid | The sub gets paid after the GC receives owner funds, but usually within a reasonable time. | Use carefully when owner-funded timing matters, but the GC still expects to carry the ultimate payment obligation. |
| Pay-if-paid | The sub is paid only if the owner pays the GC. | Highest-risk clause for trade relationships and often the most litigated. |
Net-15 is attractive when you want strong subcontractor loyalty. Trades notice which builders pay quickly. If you want the best electrician or trim crew to answer your calls first, short payment cycles matter.
Net-30 is more common because it lines up with monthly owner billings, lender draws, and standard bookkeeping rhythm. It is still fair if approval standards are defined and invoices do not sit unanswered.
Pay-when-paid is often misunderstood. In many states, courts treat it as a timing provision, not a complete risk transfer. That means the GC may get more time to pay, but not a permanent escape from payment if the owner never funds.
Pay-if-paid is different because it tries to make owner payment a condition precedent to the GC's duty to pay the subcontractor at all. That is why it creates so much tension. The sub feels like it is financing owner risk without control over owner behavior, lender paperwork, or change-order approval.
The 5 payment milestones that work well for subs
The cleanest sub agreements tie payment to visible, documented completion instead of vague percentages. A five-milestone structure usually works because it matches how field work actually unfolds.
- Mobilization. Use this for long-lead materials, layout, temporary protection, or committed startup cost. Keep it modest so you are not overpaying before meaningful work is in place.
- Rough-in. A major progress payment once concealed systems or production scope are substantially installed.
- Inspection. Release another portion when required rough or in-process inspections pass and deficiencies are corrected.
- Substantial completion. Pay when the trade scope is functionally complete and only minor punch work remains.
- Final. Release the remaining balance after punch items, closeout paperwork, and any lien waivers are delivered.
This milestone structure is especially useful on mechanical, electrical, plumbing, drywall, roofing, and finish scopes where production stages are visible. It lets both parties talk about facts instead of feelings. Either rough-in is complete and documented, or it is not.
Always tie payment to documented completion
Milestones only work when the contract explains how completion is proven. If your payment section says the sub gets paid at rough-in complete, define what that means. Does it mean all rough piping is installed? Does it require pressure testing? Does it require passed inspection? Does it exclude owner-added scope that has not been priced yet?
At a minimum, the payment section should identify the documents required for each billing: invoice, schedule of values or milestone reference, photos when appropriate, approved change-order backup, daily logs or field tickets for time-and-material work, and inspection sign-off where the milestone depends on it. That one paragraph prevents a surprising number of payment arguments.
When completion is documented the same way every time, your office can process invoices faster and your project manager does not have to reconstruct the field story three weeks later.
How much retainage should you hold on subs?
For many residential and light commercial jobs, 5% retainage is enough. It keeps the sub engaged through punch and paperwork without creating unnecessary resentment. 10% is more aggressive and may be appropriate on riskier scopes, low-trust relationships, or projects with heavy closeout exposure.
The bigger question is not whether you hold retainage. It is whether the subcontract says exactly how retainage is released. If the contract only says retainage is paid at final completion, you will argue later about what final completion actually means. Tie release to specific events such as punch completion, final inspections, lien waiver delivery, attic stock or manuals if relevant, and payment from the related owner draw if your state law allows that timing structure.
How pay-when-paid clauses affect subcontractor relationships
Even when pay-when-paid language is enforceable, it changes the emotional tone of the relationship. Subs hear it as, “Your cash problem is now my cash problem.” That may not be your intent, but it is often how it lands. Good trades respond by increasing prices, demanding larger deposits, slowing future scheduling priority, or refusing to float correction work while payment is unresolved.
If you use pay-when-paid language, offset the tension with other fair terms. Approve invoices quickly. Define a reasonable outside payment date after owner funding is received. Share draw schedules so the sub can see when money is expected. Communicate openly if lender inspection or owner paperwork is the bottleneck. Fair process matters as much as legal wording.
What to include in the payment section of a sub agreement
- Payment schedule. State whether the deal is net-15, net-30, milestone based, or contingent on upstream payment timing.
- Invoice requirements. Spell out what the sub must submit, when it is due, and who must approve it.
- Milestone definitions. Define mobilization, rough-in, inspection, substantial completion, and final completion in plain language.
- Retainage. State the holdback percentage and the exact release conditions.
- Change-order billing. Explain how approved changes affect the payment schedule and when extra work becomes billable.
- Lien waivers. Identify when conditional and unconditional waivers are required.
- Backcharge rights. Keep the right to offset documented damages, but define notice and support requirements so it does not look arbitrary.
- Dispute path. Name the person or process that resolves invoice disputes quickly before the issue spreads into the field.
Final takeaway
Strong subcontractor payment terms do not try to win the whole risk argument in one paragraph. They create a payment process that is clear, documented, and realistic for both the GC and the trade partner. Use milestone-based billing, document completion carefully, keep retainage reasonable, and be cautious with contingent payment clauses that damage trust faster than they protect cash.
If your payment section answers who bills, when they bill, what proves completion, what gets held back, and when the final check is released, you are already ahead of most sub agreements in the field.
Need cleaner sub payment language?
Use the Subcontractor Agreement to tighten billing language, pair it with the Draw Schedule Template for upstream owner payments, and track the holdback with the Retainage Tracker.
Get the Subcontractor Agreement →Related Templates