Whenever the said inspectors, in settlement of their accounts pursuant to said last act herein above mentioned, may or shall have filed a full statement of their receipts and expenditures for any year, and such account, after having been duly audited and found correct, shows that the amount of all their receipts as such building inspectors is less than the amount of their salaries, together with clerk hire and all other necessary expenditures during said year, it shall be the duty of the city of Philadelphia to pay to said building inspectors the amount of such deficit so appearing by said account.
53 P.S. § 16362