Short answer: No.Can you defer your residency start date?
Is it possible to request to start 4-6 months after July 1?
If possible, what do you need to do?
It possible, depending on why you're deferring it. Three reasons that a PD might accept are:Short answer: No.
Long answer: Hell no.
It may be possible to find an off-cycle position that starts in Nov-Feb, but you'd have to find it after the completion of the match (where almost 100% of the spots fill). The only realistic way these positions exist is if someone doesn't start residency 2/2 something like visa issues/not graduating/not passing step 2 OR if someone gets kicked out of residency. Then the programs are left with an empty spot mid-year and may look to fill it. There is no way of telling when or where such spots might exist.
Realistically, if you can't start residency till after Nov of a year, you simply don't start until July of the following year. Or you find a program that so desperately wants you they leave a spot empty and then fill it off cycle. Off cycle spots that start before february being the only ones allowed to fill outside of the match. I'm not even sure how kosher leaving a spot empty is to be honest.