The proof of parents’ down payment is as follows:

1. Sign a gift agreement: After the parents make the down payment, they can sign a gift agreement with the home buyer to establish the rights of both parties in the property. Obligations and Agreements. The agreement needs to state the amount and proportion of the donor's contribution, the amount and proportion of the donee's contribution, the donor's ownership of the house, etc. After the agreement is signed, it needs to be notarized or filed with relevant agencies to ensure the legal validity of the agreement.

2. Leave a bank transfer record: After the parents make the down payment, the home buyer can ask them to make a bank transfer and leave a transfer record. The transfer record can be used as valid proof of the gift. Home buyers can check the transfer records through the bank's website, mobile banking APP and other channels to avoid disputes in the future.

3. Leave bank check and other relevant certificates: Home buyers can ask their parents to pay the down payment by bank check, etc. The issuance of the check can serve as proof. Home buyers can store their checks in a safe place and leave relevant credentials in case they need them later.

4. Leave cash vouchers for parents’ down payment: If parents pay down payment in cash, the home buyer can ask them to sign a loan agreement and leave relevant cash vouchers (such as bank deposit slips, deposit certificates etc.) to avoid later disputes.

5. Notarize the house ownership certificate: In addition to leaving the above certificates, the home buyer can also notarize the house ownership certificate to establish the authenticity of the house ownership. Notarization of house ownership requires relevant supporting materials such as the purchase contract, housing certificate, passport of the buyer, donor or agent. The notarization cost is relatively expensive, but it does play an important role.

Parents contribute capital as down payment. Common ways to prove it:

1. Fund transfer records: If your parents remit money to you through bank transfer, you can keep the corresponding transfer records. Generally speaking, bank transfer records can be used as valid proof of source of funds.

2. Written certificate of fund donation: If your parents give you funds as a gift, you can ask them to sign a written certificate. The content of the certificate should include the amount of donation, time of donation, purpose of donation, etc. At the same time, parents' signature and seal are required.

3. Parents’ bank statement: If parents deposit cash in the bank, they can keep the corresponding bank statement. The transaction certificate should include information such as bank name, deposit amount, deposit time, etc.

4. Parents’ tax certificate: If the parents’ source of funds is salary, bonus or other income, the corresponding tax certificate can be retained. Tax certificates can be used as valid evidence to prove the source of parents’ income.

To sum up, different banks or housing purchase institutions may have different requirements for supporting documents. Therefore, when retaining certification materials, it is best to first understand the requirements of the relevant agencies and provide corresponding certification materials as required.

Legal basis:

Article 1063 of the "People's Republic of China and Civil Code"

The following properties are the personal property of one spouse :

(1) One party’s pre-marital property;

(2) Compensation or compensation received by one party due to personal injury;

(3) Will or gift Property determined in the contract to belong only to one party;

(4) Daily necessities exclusively used by one party;

(5) Other property that should belong to one party.