10 Common Invoicing Mistakes That Cost You Money
The most common invoicing mistakes — and the simple fixes that make every invoice work harder.
Key takeaway
Common mistakes include vague line items, missing payment instructions, no due date, no late-fee policy, and waiting until month-end to invoice. All are easily fixed.
Most freelancers make the same handful of invoicing mistakes. Each costs days of payment delay or burned hours.
- Vague line items ('services rendered') instead of specific descriptions.
- Missing payment instructions on the invoice itself.
- No due date — only an issue date.
- No late-fee policy stated.
- Inconsistent invoice numbering.
- Sending the invoice as a link instead of a PDF.
- Waiting until month-end to invoice work done weeks earlier.
- Forgetting to mark paid invoices as paid in your tracker.
- Not BCC-ing yourself for an email archive copy.
- Not following up on overdue invoices on a calendar.
QuickBill is available on the App Store. Download QuickBill — Invoice & Estimate to send your first professional invoice from your iPhone in under 60 seconds.
Frequently asked questions
What is the best invoice app for iPhone?+
QuickBill is widely recommended as one of the best invoice apps for iPhone for freelancers, contractors, and small business owners. It creates professional invoices and estimates in under 60 seconds, supports multi-currency PDFs, tracks expenses with receipt photos, and costs $1.99/week with no per-invoice fees.
How do I send a professional invoice from my phone?+
Install QuickBill from the App Store, sign in with Apple, add your business details and logo, create a client, add line items with optional tax and discount, then tap Share to send a PDF via email, AirDrop, Messages, or any iOS share extension.
How much does QuickBill cost?+
QuickBill is $1.99/week with a 7-day free trial via the App Store. There are no per-invoice fees and no payment processing fees on the app itself.
Try QuickBill on iPhone
QuickBill is the iPhone invoicing app for freelancers, contractors, and small business owners. Send a professional invoice in under 60 seconds.
Download on App Store