N.J. Stat. § 17:37-7
When the directors of any mutual fire insurance company of this State make an assessment, they may assess over and above the amount of the losses and liabilities existing and unpaid at the time of making the assessment, any sum which they determine. The assessment shall be made against each member in proportion to the amount of insurance upon which he is liable to assessment by the rules and regulations of the company, not to exceed 1% of the amount of insurance, or in proportion to the original amount of his deposit note, which is assessable according to the constitution and by-laws of the company making the assessment, and in the latter case does not exceed 20% of the deposit note. The surplus, if any, collected upon the assessment, shall be placed in the company's treasury and be used only for the payment of losses and expenses, according to the provisions of its charter or certificate of incorporation. The same rights and remedies shall exist for the collection of the assessment as are given in and by the charter or certificate of incorporation of the company for the collection of the assessments therein provided for but no assessment shall be made against any member upon a policy issued for a cash premium only in pursuance of the authority of section 17:28-3 of this Title.
N.J.S. § 17:37-7