'I'm an HR expert and 3 things will get you fired'

An HR professional has disclosed the workplace blunders that could cost you your job. Many assume dismissal stems from a single catastrophic event. However, according to HR specialist Kate Underwood, it typically results from minor behaviours accumulating over time until bosses ultimately lose faith and forbearance. Despite common assumptions, it rarely concerns trivial office annoyances or innocent errors. Kate Underwood, who established Southampton-based Kate Underwood HR and Training , explained that most companies can tolerate occasional slip-ups. What triggers genuine alarm is flawed judgement, deceit, or persistently disregarding professional standards. She explained: "Most people don't lose their jobs over one tiny mistake. It's usually a slow build-up of poor judgement, ignored feedback, attitude problems, or repeatedly thinking the rules are for 'other people'." Among the most serious warning signs for companies was dishonesty, Kate noted. She continued: "Honestly, most employers can deal with mistakes. What they struggle to come back from is lying. Once trust has gone, it becomes very difficult to rebuild." She also cautioned workers against dispatching emotional or confrontational communications during moments of anger, especially via email or workplace messaging platforms. She warned: "If your message starts with 'With all due respect...', there's a strong chance respect has already left the building." Another escalating concern for bosses is employees viewing workplace rules as suggestions rather than requirements. Kate explained: "Policies around social media, confidentiality, harassment and data protection are not inspirational suggestions. They exist for a reason and employers take breaches very seriously." Sharing work-related content online continues to be one of the most frequent ways workers get themselves into hot water, especially when grievances are aired on social media. She noted: "If you are ranting about your boss online while your colleagues are literally tagged in the pub photo beside you, that is usually not going to end well." Kate also cautioned that conduct brushed off as "banter" can rapidly develop into disciplinary matters if it oversteps professional limits. She continued: "The phrase 'it was just a joke' is often where things start going downhill very quickly." Punctuality and communication represent another significant flashpoint in the workplace. While bosses recognise that life can be unpredictable, repeatedly vanishing without notice or habitually turning up late without explanation can severely undermine professional trust. Kate observed: "Life happens. Trains fail. Children lick walls. Chaos exists. But disappearing into the abyss without telling anyone will frustrate people very quickly." She further highlighted that staff frequently misjudge how gravely employers regard matters involving falsified records, expenses or sick leave. She went on: "Nothing says 'career-limiting decision' quite like fake timesheets, mileage claims or compliance logs. Working another job while off sick is another huge issue, especially if somebody has said they are too unwell to work but is then posting online from somewhere else entirely." Crucially, Kate emphasised that strong performance is no excuse for poor conduct. She added: "I've seen genuinely talented people walk themselves straight out the door because they believed being brilliant at their job gave them immunity from behaving badly. Being excellent at your role does not cancel out poor conduct." As workplaces continue to evolve and the lines between online and offline professional life become increasingly blurred, Kate warned that employees must bear in mind that their behaviour, both in and out of work, can still carry serious repercussions. She went on to say: "People often think probation periods or informal workplace cultures mean the rules do not fully apply yet. But employers are always paying attention."