Never seek or accept a counteroffer at work. The result could be ugly.
Briefly

Using a competing job offer to negotiate a raise can damage your relationship with your employer, as they may feel betrayed and unwilling to trust you again.
You might receive a counteroffer, but it communicates to your employer that your relationship is purely economic, irrevocably altering their perception of you.
Negotiating salary at the job offer stage is optimal; once employed, haggling can tarnish trust and impact future opportunities, such as promotions.
Employers might become wary after a counteroffer situation, reducing their willingness to invest in your training and career growth.
Read at Business Insider
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