Startups affiliated with an official Linear partner (investors, accelerators and startup communities, including a16z, Sequoia, Techstars and Antler) receive free access to Linear's Business plan. Linear's startups page describes up to six months free.
The offer is only valid for non-paying Linear users with fewer than 50 employees, and you must be an admin of your workspace. Redeem through the link your partner gives you or enter your partner code. When the discount period ends, the Business subscription renews at the standard rate unless you switch plans or cancel first.
If you are not affiliated with a partner, Linear's free plan includes all major features, unlimited workspace members and 250 issues.