Your agent should make it abundantly clear to you when you purchase a plan. If you haven’t seen your agent for years- Check with a local tax professional or the call the insurance company directly- most of the time, benefits are received tax free. Make sure you understand your states particular views on different life insurance arrangements.
Usually the benefit is received by the beneficiaries income tax-free, but not estate taxes in some cases. Group policies through your employer may be taxed to beneficiaries after the first $50,000 but you will need to check with you local tax professional.