If you paid the premiums on the policy with after-tax dollars, the benefits are not taxable because they are considered a form of health/disability insurance.
If you paid for the premiums via payroll deductions, the that means the premiums were paid with pre-tax dollars, and are reported as income.
See below.
https://ttlc.intuit.com/questions/3015447-where-do-i-report-income-from-a-cancer-insurance-policy
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