Actually.... If I understand correctly, you GAVE out a loan and did not take a loan. So you need to reverse what @Charies_M told you.
The money (Principal) you gave out is a Current Asset not a Liability. So in your Chart of Accounts (CoA) you want to go to New and Other at the bottom and create an Other Current Asset. Give it a name that will make sense years later like: Smith Inc Loan.
Go back to New and Other and create an Other Income account. This will be the Interest Income you earn from the loan. Give it a similar name like Smith Inc Interest.
If you've already made the payment, you may or may not need to delete and re-add it. You need to make sure that Smith, Inc. is a Customer (or could be Other), but is NOT a Vendor. If you've already made the payment and had them as a Vendor, then just Delete the entry and make a new entry. (Be sure to keep the same date that you actually made the payment.)
NOTE: If Smith, Inc happens to be also a Vendor, create a new Customer named Smith Inc Loan (or something similar) to distinguish between the two.
When you make the payment entry, the Acct associated will be the Other Current Asset:Smith Inc you just created. You'll see that account now shows a balance of the full Principal.
When you receive the monthly (or whatever) payment you will Deposit the money and make a Split entry. The Principal payment will go to the Other Current Asset:Smith Inc and the Interest payment will go to Other Income:Smith Inc Interest Acct.
You will see the Principal account go down as payments are made and the Interest will be shown as Income. So you will easily be able to see the outstanding Principal and how much Income has been brought in.
And you mentioned a 3rd adjustment. What would that be other than the Principal and the Interest?
Also.... DO make sure you reach out to your Tax Accountant. There may be differences they want made in the names or entries based on your specific type of company and how they file your taxes.