A warning letter for carelessness in work is a formal notice given to an employee to address repeated mistakes or negligence that affect job performance and to urge immediate improvement. Below are various samples provided for your reference.
#1
This is to bring to your attention a concern that our clients have raised regarding multiple errors found in our customer invoices generated by you. Upon investigation, we discovered numerous discrepancies in the invoices issued over the past two weeks.
As a result, we are issuing an official warning regarding your carelessness. Future negligence will not be tolerated. You are, therefore, strictly advised to practice more caution in the future. You must review and countercheck all invoices before issuing them to the clients.
If you require technical assistance, please do not hesitate to contact our technical team. We expect error-free invoices and receipt records going forward.
I look forward to your prompt attention to this matter.

File: MS Word (.docx) 135 KB
#2
This letter serves as an official warning regarding your careless execution of the XYZ project. You have failed to complete the project within our scheduled timeframe. This has led to client dissatisfaction and has significantly damaged our reputation.
As a consequence of your negligence, the project leadership is being transferred from you to a more competent Project Manager. Additionally, your performance will be reviewed over the next six months. Further carelessness will result in stricter disciplinary action, which may include your demotion or termination.
We expect you to take this warning seriously and bring immediate improvement to your focus and efficiency at work.

File: MS Word (.docx) 146 KB
#3
We want to discuss some issues with your recent work performance. The XYZ report compiled by you contains several careless errors. Your minor negligence may lead to significant damage to the company.
You are urged to improve your focus at work. Always double-check your work and proofread to eliminate possible errors. If you require any support or guidance, please do not hesitate to contact me.
Please consider this an official warning. Future instances of carelessness will be addressed with an appropriate disciplinary action.

File: MS Word (.docx) 146 KB
#4
This letter serves as an official warning for carelessness in your work. The documents you submitted for logistics on (date) lacked necessary verification. As a result, our shipment has been delayed.
You are hereby warned to exercise utmost diligence in performing your work tasks. Continued carelessness may result in your suspension or termination, as per the company’s policies.
Please take this warning seriously and avoid any negligence in the future.
#5
We are writing to express our disappointment at your poor work performance. Despite previous verbal warnings, your delayed report submissions and incomplete tasks display utter carelessness and unprofessionalism.
This letter, therefore, serves as a formal warning for your carelessness at work. You are advised to bring immediate improvement. Continued nonchalant attitude towards your job will result in disciplinary action, including your possible termination from your post.
We strongly advise you to take this warning seriously.
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