Apologize first thing Even if you called your boss to let them know of your lateness, make sure to speak with them as soon as you arrive. Putting it off will make you seem irresponsible or indifferent. Be sincere If you don't have a good reason for showing up late, take responsibility for your own actions instead of making up a long-winded story. If you have a reason that is appropriate to share, be open about it. Inappropriate reasons (e.g., embarrassing health issues, personal distractions) do not require details. Examples: “I'd like to apologize for being fifteen minutes late today, it was poor timing on my part and it won't happen again.” “I'm sorry for coming in 30 minutes late today, my youngest child got sick just as I was walking out the door.” “I’d like to apologize for coming in 10 minutes late today.” Show understanding and set expectations Show your boss you understand how the company or others were affected by your tardiness and what you aim to do be punctual going forward. Examples: “I understand we couldn’t open on time today because of my tardiness and I aim to leave the house earlier in the future.” “I regret that my coworkers had to scramble to make up for my absence and I’ll be sure to take an earlier bus during rush-hours.” “I feel remorseful that the first client of the day had a negative impression of this company and I promise to be punctual from here on.” End the conversation with gratitude Thank your boss for patience and understanding to re-establish a positive work relationship. Examples: “Thank you for being understanding about this. I'll be more vigilant of the time from here on.” “Thank you for being patient with me, I take full responsibility for my tardiness and promise it won't happen again.” “I really appreciate your understanding. Thank you for giving me another chance to show my loyalty to this company.”