Legal analysis: Yes, the maintenance fund must be changed into an invoice. If it is lost, it can be reissued. When you sign a house sales contract, you can apply for a commercial loan from the bank. Whether it is a first-hand mortgage or a second-hand mortgage, it is necessary to submit the complete materials approved by the bank to the bank for review, which is the most important step in the commercial loan process.

It mainly includes the original and photocopy of ID card, household registration book and marriage certificate, and temporary residence permit or residence permit is required for foreign household registration; Income certificate issued by the work unit; Sales contract, down payment invoice or receipt; Proof of salary or other assets in the past six months. In addition to the above five materials, different banks have different requirements for commercial loans, and other materials required by loan banks should be inquired in detail.

Legal basis: Article 1 of the Measures for the Administration of Special Maintenance Funds for Residential Buildings stipulates that the owners of commercial residential buildings and non-residential buildings shall deposit special maintenance funds for residential buildings according to the construction area of their own properties, and the amount of the first special maintenance funds for residential buildings shall be 5% to 8% of the cost per square meter of local residential buildings and facilities. The competent departments of construction (real estate) of the people's governments of municipalities directly under the central government, cities and counties shall, according to local conditions, reasonably determine and announce the amount of the first-phase residential special maintenance fund deposited per square meter of construction area, and make timely adjustments.