Change Order Payment Terms: Net 30, Due on Approval, and What to Put in Writing

You priced the extra work correctly. You got the signature. Sixty days later, your cash flow still feels wrong because nobody ever agreed when that money moves. In construction, "approved" is not the same thing as "paid," and the gap between those two words is where small contractors quietly bleed.

Payment terms belong on the change order for the same reason scope and price belong there: they remove ambiguity before emotions run hot. This guide explains common term patterns, what they imply on a busy job, and how to write them in plain language — without turning every extra into a negotiation marathon.

This article is practical education, not legal advice. Match any language to your contract, state rules, and counsel when stakes are high.

Why Approval Without Payment Timing Still Creates Disputes

Most arguments about extras are not really about the dollar amount. They are about timing and expectations: the homeowner thought it would hit the next draw, the GC assumed "normal invoicing," and your office assumed Net 30 from invoice date — which might be weeks after the work finished.

If your base contract already defines billing for change work, follow it. If it is vague, the change order is the right place to restate the rule in one sentence everyone can see next to the signature. That single habit prevents the uncomfortable "I thought / you thought" loop that shows up in change order disputes.

Common Payment Term Patterns (and What They Mean in the Field)

There is no universal best choice — only the choice that matches your risk, your relationship, and how you actually bill. Here are patterns contractors use every week:

• Due on approval / due upon execution. Payment is tied to signing, not to some future invoice someone might forget to send. Strong for smaller extras where float hurts you.
• Added to next scheduled draw / application for payment. Typical when the project runs on AIA-style draws. Make sure the change order states which draw cycle it attaches to.
• Net 15 / Net 30 from invoice date. Common with institutional clients. Clarify what counts as invoice date (sent, received, approved internally).
• Deposit plus balance. Useful on material-heavy extras where you must order stock before you swing a hammer.

Whatever you pick, write it where the approver sees it: same page as the total, same PDF you send for signature. If you need help structuring line items and totals first, start with our guide on how to price a change order.

Plain-Language Clauses You Can Adapt

Short beats clever. Pick one line that matches how you actually bill:

• "Payment for this change order is due in full upon approval."
• "This amount will be included on Application for Payment #[X] dated [date]."
• "Invoice due Net 30 from invoice date; invoice will be issued upon substantial completion of this change."

If your original agreement says something different, say so on the change order: "Per Section [__] of the construction agreement, billing follows [describe]." Consistency beats surprises. For the full workflow around drafting and signatures, see how to write a change order in five steps.

When "Net 30" Starts (and Why Everyone Guesses Wrong)

Net 30 sounds simple until three calendars disagree: the day you finished, the day accounting received the PDF, and the day someone keyed an invoice. If you rely on Net anything, define the trigger in one sentence on the change order or cover email.

Also remember: a verbal "sounds good" is not the same as executed payment terms. If someone tries to approve extras by text without paperwork, read why "go ahead" in a text is not a change order — then route them to the real document.

Follow-Up That Protects Relationships

Polite persistence is a skill. The goal is to remind people of what they already approved, not to pick a fight. A simple sequence works for many shops:

1. Day 0: Email the signed PDF with one sentence summarizing amount and payment timing.
2. If nothing moves: One short reminder referencing the signed document and the due date or draw cycle.
3. If still stuck: Ask a calendar question ("Which Friday works for AP?") instead of a blame question.

Documentation makes every step easier. Photos attached to the change order reduce scope debates so finance hears fewer excuses upstream. Our overview of GPS photo documentation explains how to build that habit without slowing the crew.

Bottom Line

A change order that only locks scope and dollars still leaves cash flow to chance. One clear payment-term line — sitting next to the total and signature — turns "approved extra" into "money we can plan around." That is not greed; it is how professional contractors stay solvent enough to show up tomorrow.