Yes, $3,000. If you have investment sale losses, after you subtract the losses from your gains then if you have a net loss, you can only deduct up to 3,000 per year.
You have to report the carryover every year until it's used up. You can't skip a year. Even if you don't report it on your return you have to reduce it by the 3,000 (1,500 MFS) when you carry it over to next year. You can't choose when to use it.
