1. Incomplete invoices
One of the most common mistakes is sending incomplete invoices. Important details are often missing, such as the invoice number, the date or the VAT details. That confuses your customer and delays payment. Put at least this on your invoice:
- Your company name and address
- Contact details
- Invoice number and date
- VAT number (if applicable)
- A clear description of the services or products supplied
- The total amount including VAT
- Payment terms
With invoicing software like NumNum, you create templates so you don't forget any important details.
2. Forgotten payment reminders
Following up invoices is at least as important as sending them. Businesses often forget to send payment reminders on time. This can lead to unnecessary payment delays and even cash flow problems. Fortunately, you can easily automate this. By using a reliable invoicing system, you can set up automatic reminders that remind your customers of their outstanding payments on time. This saves you time and avoids awkward conversations.
3. Incorrect calculations
Everyone makes a mistake now and then, but with invoicing, incorrect calculations can cost you dearly. A wrongly calculated VAT rate or a mistake in the number of hours or products can damage your credibility and means extra work to put it right. Always double-check the calculations before you send an invoice. Use an automated invoicing system to minimise human error.
4. No follow-up of outstanding invoices
It's important to have a clear overview of your outstanding invoices. Many business owners forget to go through their invoices regularly, so outstanding amounts quietly pile up. In the end, this can seriously disrupt your cash flow. Use an invoicing system that helps you easily keep track of which invoices haven't been paid yet and which reminders need to be sent.
How NumNum catches these mistakes
Every invoice gets a number from your own numbering and a structured payment reference. If a payment doesn't arrive, reminders follow it up on your schedule and in your words. When the money comes in, your bank connection matches the invoice automatically. Try for free
