When the work changes, keep the paperwork connected.
A scope change can affect cost, timing, the job record, and the final invoice. Use one clear trail from the request through approval and billing.
Request → Impact → Approval → Job → Invoice
Write down what changed.
Give the request a job-linked ID, such as CO-01. Record when it came in, who requested it, and the exact work being added, removed, or revised. Note the original scope it changes and attach a photo, marked-up plan, or message when useful. Keep the status marked as proposed until it is approved.
Show the math and timing.
List added and credited work separately. Show quantities, labor hours and rates, materials, subcontractor or equipment costs, and any assumptions behind the price. Estimate the schedule effect too: affected milestone, expected days added or saved, and anything still uncertain. FHWA guidance for major highway projects recommends documenting estimate assumptions and changes; use that as a recordkeeping prompt, not as a small-contractor rule. [2]
Keep the decision with its version.
Send the change description with its price and timing effect through the process in your agreement. Save the dated response and note who approved, what version they approved, and the status. If anything is still pending, leave it labeled pending and follow your agreement’s instructions about whether work may proceed.
Carry the same ID into job costs.
Keep the original estimate intact, then add the approved change to the current job budget or forecast. Record actual labor and purchases against the same job and change ID, with the related time record, receipt, or bill attached. IRS Publication 583 describes business recordkeeping and supporting documents for receipts and expenses; it does not prescribe a change-order workflow. [1]
Match approved changes to billable lines.
Use the same change ID on each related invoice line. Describe the approved work and quantity or agreed price; show credits for removed work clearly. Before sending, compare each approved change with what has been invoiced, then recalculate the invoice subtotal, applicable tax, prior payments, and remaining balance. Keep the approval, job entry, and invoice together so each amount has a traceable source.
REFERENCE DESK
Sources and limits
These references support recordkeeping and estimate documentation. They do not establish a universal change-order, invoice, tax, or approval rule for independent contractors. Follow the process in your agreement and check location-specific questions with a qualified adviser.
- Internal Revenue Service: Publication 583: Starting a Business and Keeping Records
Federal business recordkeeping guidance, including examples of supporting documents for receipts and expenses.
- Federal Highway Administration: Major Project Program Cost Estimating Guidance
Guidance for major highway projects that recommends documenting estimate assumptions and changes. The checklist here adapts that recordkeeping idea; it is not a contractor billing standard.
Sources checked .