I’m a sole proprietor and opted in to workers’ compensation. Can I deduct my premiums on Schedule C?

Estimated tax

Advance payment of current tax liability based either on wage withholdings or installment payments of your estimated tax liability. To avoid penalties, you generally must pay to the IRS either 90% of your final tax liability, or either 100% or 110% of the prior year’s tax liability, depending on your adjusted gross income.