Owner's loan to a contractor

Thanks for posting the Community space, @Lenkyta.

You'll need to create a liability account first if the owner made a loan to the contractor. This way, you can properly record the loan in QuickBooks. 

Here's how:

1. Click on the Gear icon and choose Chart of Accounts.
2. Select New
3. From the Account Type ▼ dropdown menu, select Long Term Liabilities. Note: If you plan to pay off the loan by the end of the current fiscal year, select Other Current Liabilities instead.
4. From the Detail Type ▼ dropdown, select Notes Payable.
5. Enter the name of the account.
6. Enter the amount as a negative amount
7. Click  Save and Close.

Once done, proceed to Step 2 and 3 of this article on how to record the loan and its repayment: Set up a loan in QuickBooks Online.

However, if it's the contractor that needs to record the loan and its installment, I'd suggest asking for guidance from your accountant. They'll know what account should you use to properly record the loan to ensure the accuracy of your books.

Once everything is set up, then the contractor can now repay the installment, just click this article: Enter a refund from a vendor.

I'm adding these articles that will help you track your loans and how to enter credits in QuickBooks:

• Track customer loans
• Enter a credit from a vendor

 If you meant something else, I'd appreciate any extra details you have so I can provide the steps to move forward. Take good care.