Strategy

The biggest career mistake I ever made is something most people do

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Half of all workers accept the first offer made to them.  Heino Kalis/Reuters

The day before I graduated from college, I got a call from a hiring manager. I had been interviewing for jobs for weeks, and this was the one I wanted.

I listened carefully as she made me the offer and went over the benefits. The salary was not great. But I was starting at the bottom, and it was exactly what I expected.

Without a beat, I exclaimed, "I accept!" For the rest of the day I was glowing, beaming at the future unfolding in front of me.

It was months or even years later when I realized I had made a terrible mistake: I hadn't negotiated my salary. I hadn't even taken a moment to think over the offer.

I was locked into that low starting point when a recession swept over global markets and slowed wage growth for years.

I am not alone in making this mistake. A Careerbuilder survey found that nearly half (49%) of all workers accept the first offer given to them. And I suspect it's even more prevalent when it comes to first jobs, since the same survey found that workers under age 35 are less likely to negotiate than their older counterparts.

While losing out on an extra few thousand dollars may not seem like a big deal, it matters over time. According to an analysis by Salary.com, professionals who negotiate their initial salary and renegotiate every few years stand to earn $1 million more on average during their careers than those who don't.

And because raises and future offers generally build on your current salary, that first mistake can haunt you for a long time.

That's not to say you're doomed if you don't negotiate. After being more assertive in later years, I was able to make up ground. And of course, it's not certain that I would have successfully been offered more money if I had asked. But if I had known that I should have asked — that most employers expect it — I would have tried.

Now, I'll never know what might have happened.

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Jenna was a deputy editor at Business Insider through April 2016. She managed the Strategy, Careers, and Your Money sections, as well as the Lists and Syndication teams.Prior to joining the company in August 2013, she worked as an associate editor running daily news coverage at Entrepreneur and as a staff leadership reporter at Forbes, where she assistant edited the annual list of the World's 100 Most Powerful Women and helped launch and grow ForbesWoman.com, an online channel for professional women. Jenna has appeared on CBS, CNBC, and MSNBC and written for Businessweek magazine. She graduated summa cum laude from New York University with a degree in journalism and sociology, and was honored with a best in business award from the Society of American Business Editors and Writers (SABEW) in 2012.She coauthored the book "Find and Keep Your Dream Job" and can be found on Twitter, Facebook, and LinkedIn.