obscure brings up good points about why you don't want to delay a real job, but grad school they're not going to care. I just think you're not looking for the middle ground well enough. Taking a year off is one more year you'll probably have to work, its one more year you'll have to put off living your life. I think planning with your g/f involved and making a tiny sacrifice of one year apart would be better for you. Your first year of grad school is a great time to network. You'll want to get to know your classmates, and that will be much easier without a girlfriend around. Once you start working at advanced levels, who you know becomes almost as important as who you know. Someone you go to grad school with may do a lot of things in the future: referee a paper you wrote, help you find a job, help you fill a vacant position you have, introduce someone who you can collaborate with, broker deals, grease wheels, get you the better spot at a conference, someone to go out for drinks with at said conference, and honestly, some of your best friends. You don't foster those lifetime relationships in a classroom; they happen at bars, cookouts, tailgating, late-night pizza, and times you don't expect it to. None of which you'll be a part of if you're spending all your time with your g/f your first year of grad school. Networking is very important in a field like chemistry where you wouldn't think it would be. I can't imagine you're entering a field where everyone forms insulated bubbles of humanity.