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Invoice from Time Entries
Turn your tracked time into a professional invoice.
Time-to-Invoice Reconciliation & GAAP Rounding Mathematics
Invoicing from raw time entries requires converting minute timestamps into decimal hours and calculating line-item extended subtotals with banker's rounding (half to even) to satisfy GAAP auditing rules:
1. Decimal Hours Conversion:
H_i = Minutes_i / 60 (Rounded to 2 decimal places)
2. Line Item Extended Subtotal:
L_i = Round(H_i × Hourly Rate, 2)
3. Cumulative vs Independent Line Rounding:
Total Invoice Due = ∑ L_i (Summing rounded line totals prevents penny discrepancies)
5 Fatal Traps in Time-to-Invoice Conversion
1. The Ghost Entry Double-Invoicing Trap
Failing to flag time entries as "Billed" once an invoice is generated. When invoicing again at month-end, consultants accidentally re-bill overlapping dates, prompting embarrassing client fee audits and payment disputes.
2. The Fixed-Fee vs Hourly Hybrid Collision
Mixing flat-rate milestone deliverables with hourly consulting hours on the same unstructured timesheet. Grouping fixed fees under hourly rates misrepresents work classifications and skews contractor 1099 tax documentation.
3. The Fractional Minute Rounding Penny Discrepancy
Summing raw unrounded milliseconds across dozens of entries and rounding only the final total. Client accounting departments verifying each line item (Hours × Rate) will find that the sum of the rows does not match the invoice total by $0.01 to $0.05, rejecting the invoice.
4. The Ambiguous Internal Description Exposure
Exporting raw internal developer notes like "bugfix", "research", or "call" directly onto client invoices. Enterprise clients demand descriptive deliverable milestones (e.g. "OAuth2 API Authentication Security Hardening") to justify billing approval.
5. The Currency Precision Mismatch
Generating cross-border invoices where fractional hours conflict with currency precision requirements (e.g. zero-decimal currencies like Japanese Yen vs two-decimal currencies like USD/EUR).
Frequently Asked Questions
How does this tool connect with my tracked time entries?
This tool reads from the unified
localStorage timesheet database maintained by our companion Time Tracker. Any hours logged on that tool appear automatically here filtered by project.
Can I filter which entries appear on the invoice?
Yes! You can select a specific project, specify From and To date ranges, and use the checkboxes next to individual line items to exclude specific non-billable entries or internal meetings.
How do I print or save the generated invoice as a PDF?
After generating the preview, click the "Print / Save PDF" button (or press Ctrl+P). The tool automatically hides all web navigation, filter bars, and controls, outputting a spotless corporate PDF invoice.
Can I customize the client name and billing address?
Yes. All client fields, invoice numbers, issue dates, and payment notes on the generated preview are fully editable text inputs that you can customize prior to printing.
Is any timesheet or invoice data sent to a cloud server?
No. The entire process runs 100% locally in your browser memory. No financial records, client names, hourly rates, or timesheet logs are ever uploaded.
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