Prepare the Job and Billing Details
Start by locating the correct job and reviewing its customer account, contract amount, billing terms, and current invoice history. Confirm that labor, material, subcontractor, and other billable transactions have been entered and assigned to the correct job and cost codes.
Review approved change orders and confirm that revised contract values are reflected in the appropriate records. Check the previous invoices, payments received, retainage, and remaining contract balance so the new invoice reflects the amount currently due. If materials or subcontracted services require purchasing, verify the supporting purchase orders and approvals. How to Process a Purchase Order: Modern Workflow & Job Roles provides context on purchase order responsibilities, approvals, and procurement controls that support accurate job costing.
Choose the Appropriate Billing Method
The billing method determines how Sage 100 users calculate the amount to invoice. For time-and-materials jobs, billing may be based on approved labor hours, rates, materials, and contractually permitted markups. Fixed-price jobs generally use agreed contract amounts and the billing schedule. Progress billing uses the value of work completed, while milestone billing depends on specified project deliverables or completion events.
For example, assume a contractor has an approved fixed-price contract of $80,000 and has already invoiced $30,000. If the next approved billing milestone is worth $20,000, the current invoice would be $20,000, leaving $30,000 of the original contract amount unbilled before considering additional approved changes or adjustments.
Calculation: Remaining unbilled contract value = Current contract value − Previous invoices − Current invoice.
Using the example: $80,000 − $30,000 − $20,000 = $30,000. This calculation assumes the contract value remains unchanged and the figures exclude taxes, retainage adjustments, credits, and other contract-specific items.
Enter and Review the Customer Invoice
Open the relevant Job Cost or billing function available in your Sage 100 installation. Select the job and customer, then enter the billing information supported by your configured workflow. Depending on the billing method, this may include the invoice date, billing period, approved quantities, labor charges, material charges, milestone amount, or progress percentage.
Review the invoice description, payment terms, tax treatment, supporting documentation, and any applicable retainage. Confirm that the invoice does not duplicate previously billed work and that the amount agrees with the approved contract terms. Preview the invoice before posting and follow your organization's authorization procedures.
Because screen names and posting behavior vary by Sage 100 version and installed modules, consult the documentation for your configuration when identifying the exact billing screen and transaction sequence.
Post Billing and Reconcile Job Financials
After the invoice has been reviewed and authorized, complete the applicable posting process. Verify that the customer invoice appears in the expected accounts receivable records and that the job's billing history and contract balances reflect the transaction. Reconcile the invoice with the job cost records and general ledger according to your accounting procedures.
Job Evaluation Finance provides useful context for evaluating job-related financial information, while Job Profitability Software describes tools used to analyze project revenue, costs, and margins. Job Distribution Finance relates to how financial amounts are assigned across jobs or business activities. These concepts help explain why billing accuracy must be considered alongside cost allocation and profitability reporting.
Monitor outstanding invoices and due dates after posting. Timely follow-up supports cash flow forecasting and helps project managers identify billing delays, disputed amounts, or documentation that customers still require.
Strengthen Billing Controls and Reporting
Maintain a consistent process for reviewing contract terms, approving billable transactions, checking invoice calculations, and reconciling customer balances. Retain signed change orders, milestone approvals, time records, and material documentation with the corresponding job records.
Businesses exploring broader finance automation can review Hyperbots Platform for company-specific ERP integrations, workflow configuration, user roles, and general ledger structures. Process Specific Capabilities describe AI automation tailored to finance processes, while Ready to Deploy Capabilities focus on pre-trained agents and pre-built ERP connectors. Self Learning Capabilities describe how systems adapt from human feedback, and Human in the Loop emphasizes review and approval for exceptions.
These capabilities illustrate broader finance workflow approaches rather than native Sage 100 billing features. AI Copilots for Sage 300 is another educational resource about finance automation in Sage 300, a separate product from Sage 100. Similarly, Leo Burman’s AP Success Story: How AI Transformed AP discusses accounts payable workflow improvements, offering a separate example of how finance teams can improve transaction processing.
Summary
To bill a job in Sage 100, verify the customer contract, review job costs and previous invoices, select the appropriate billing method, prepare and approve the invoice, and reconcile the posted transaction with accounts receivable and job records. Confirm the exact workflow for your installed edition and modules. Consistent billing controls help contractors improve invoice accuracy, maintain reliable job profitability information, and support predictable cash flow.