Here's what happens:
Every LSAT has a number of different deadlines and dates attached to it. The most important one, obviously, is the date on which the actual test takes place. Then there are a bunch of others:
1. The
regular registration deadline (i.e., if you register by that date you only have to pay the registration fee and nothing more).
2. The
late registration deadline (this is for people that miss the regular deadline but still want to register for that particular administration--there's a $68 late fee in addition to the test fee).
3. The
test CENTER change deadline (if you want to change WHERE you want to take your test).
4. The t
est DATE change deadline (if you want to change WHEN you want to take your test).
Here are the different consequences attached to each missed deadline:
Regular registration deadlineIf you miss this deadline, you will have to pay an additional $68 late fee to the test registration fee, but you can still register to take the test.
Late registration deadlineIf you miss this deadline, you're out of luck and cannot register for that particular test administration. You will have to sign up for a subsequent one.
Test CENTER change deadlineIf you miss this deadline, you will have to take the test at the test center where you originally signed up. If you show up to the other test center, they will not have you on the roster and you will not be allowed to take the test there.
Test DATE change deadlineIf you take miss this deadline, you have a couple of options:
1. You can decide to just not attend the test at all. If you do this, your LSAT Score Report (which the schools you apply to will see), will show that you registered for that test administration, but did not show up. It'll show you as "absent."
2. You can decide to take the test and cancel your score immediately. The answer sheet has a section where you can select to cancel your score on the spot. If you do this, your LSAT Score Reoprt will show that you took the test, but cancelled the score.
3. You can decide to take the test and cancel your score by the score cancellation deadline. After each LSAT is a six-day period when you can contact LSAC and cancel the score for the test you just took. If you do this, your LSAT Score Report will show that you took the test, but cancelled the score. You HAVE to cancel the score by the cancellation deadline, though, or else LSAC will not allow you to cancel your score.
4. You can decide to take the test and keep your score. If you do this, your LSAT Score Report will show the score for the test you took.
Hope that helps! You can find the different deadline if you go to LSAC Test Dates and Deadlines page, and click on the test you are interested in:
http://lsac.org/LSAT/test-dates-deadlines.asp