the plural for premium is premiums.

As in "the premiums are worth it".

Depends on how you paid the premiums. If you paid the premiums on a pretax basis, then you cannot declare the premiums. Many COBRA payments, retiree insurance payments and so on can be deducted.

Yes the word premiums is a noun. It is the plural of premium.

Depends on how you paid the premiums. If you paid the premiums on a pretax basis, then you cannot declare the premiums. Many COBRA payments, retiree insurance payments and so on can be deducted.

Life insurance premiums vary by policy. There are few that offer single digit premiums.