Hi Y'All!
I'm rather new here (not to the battle of the bulge)...and my answer is a little different, but based on my own experiences of "waiting until I lose..."
I say, if tanning makes you feel better about yourself RIGHT NOW, then do it now! If you feel better about you, you are more likely to stick with your program! Think of this as rewarding yourself for being good to you!
Then you can reward yourself with jewelry, clothing, massage as you reach your incremental goals. In all honesty, there's nothing I want badly enough (externally speaking) that will keep me from eating wrong... ok, that's not totally true...an all-expense paid trip to Hawaii might work!
I know I have a long way to go, but I am starting AGAIN... armed with Dr. Phil's book, gym membership, a trainer and my brother (former Army Special Forces guy) to hold me accountable... I will be successful this time!!! One step at a time!!!
My 25 year battle with weight started when I was 13 and my dad offered to buy me a new wardrobe if I'd lose weight... I was a
junior size 13 at about 5'7"... the "motivation" didn't work except to begin my obsession: I did my first "fad" diet at age 14, and thus began the yo-yo syndrome...
If I'd only known then what I know now... Where was Dr. Phil back then???

(Then I'd have known not to "internalize" my dad's comments...etc., etc., etc.,) Thus my reasons for not putting much stock in "external" rewards... but that's my experience.