Over-promising and under-delivering. You made an implied promise when you accepted your job. You implicitly promised that you were capable of fulfilling all of the job’s responsibilities. Accepting a job when you know you’re not qualified catches up with you. Even when you are qualified, telling your boss you’re making great progress when you aren’t or committing to a deadline you know you can’t meet makes you look bad. Don’t be surprised if you get fired for failing to do everything you said you could do.
Negativity. You were hired to make your boss’s and your team’s jobs easier, not harder. People who constantly spread negativity through their department, complain about others, and whine that the work’s too hard or isn’t part of their job description complicate things for everyone else. Those who make their boss’s life harder are usually the first ones to go. Having to tiptoe around you so as not to dislodge that massive chip on your shoulder isn’t something he or she is likely to be willing to do for very long.
Solicitation. Whether you’re sending out e-mails inviting coworkers to your party or hanging up an order form for your child’s school fundraiser, you could be violating company policy. Don’t assume that you’re in the clear just because other people are doing it—this type of policy violation is what managers hang their hats on when they’re unhappy with an employee’s performance.
A lack of emotional intelligence. Everyone knows that you can get fired for being unable or unwilling to play nicely with others, but what trips up a lot of people is having a poorly developed poker face. If everyone can tell when you’re bored or irritated or that you think something a colleague is saying is stupid, this will catch up with you. Emotional outbursts, belittling others, shutting co-workers down when they speak, and just generally being a jerk are other ways a lack of emotional intelligence will leave you looking for work.
Misusing company supplies or resources. Many people don’t think twice about taking a pack of printer paper home when they’ve run out or using the company’s FedEx account to mail a last-minute holiday gift. However, in the eyes of your employer, this is stealing. Abusing company resources is a serious offense, even if the monetary value of the item doesn’t add up to much. Catching you in the act can also be a good excuse if your boss is looking to fire you. It’s a lot easier to document and justify firing someone for stealing than it is to fire them because they are just okay at their job.
Speaking on behalf of the company. This isn’t just about sending out an unauthorized press release or venting on the company Twitter account, because most people already realize that these types of things will get them fired. I’m talking about answering a question when a reporter sticks a microphone in your face or identifying yourself as an employee of the company when sharing your personal opinions online. This creates the perception that you’re speaking as a representative of the company, even when you aren’t trying to, and that’s definitely something that can get you fired.