Every fact essential to support a claim for exemption under this subchapter shall exist on September 1 of the pretax year. Every application by a claimant therefor shall establish that the applicant was, on September 1 of the pretax year:
Such applicant shall also establish that his or her income for the yearly period as provided by this subchapter did not exceed $3,000, and that his or her spouse, if living in said dwelling house, does not have an income in excess of $3,000.
9 Del. C. § 8134