My unit by the old for new sales of equipment, new equipment 20000, the old equipment folded 3000, how should be invoiced?

What is involved is a trade-in sale that needs to accurately reflect the reality of the transaction when invoicing. Generally speaking, this transaction can be reflected in the invoice in the following ways:

1. Issue an invoice for the sale of a new instrument:

Name of goods or taxable services: Fill in the name of the new instrument you are selling.

Amount: Mark the full price of the new instrument, i.e. $20,000.

Remarks column: you can indicate "trade-in, the old instrument discount 3000 yuan" and other information to indicate the specifics of the transaction.

2. On the treatment of old instruments:

If the unit on the recovery of old instruments for re-sale or other forms of utilization, may need to be based on the actual treatment of old instruments, separate invoices or accounting treatment.

If the old instrument is only treated as a discount and is not an independent object of sale or transaction, then a separate invoice for the old instrument may not be required.

3. On the reflection of the actual amount paid:

The actual amount paid by the customer is $17,000 ($20,000 price of the new instrument minus $3,000 discount on the old instrument), which is usually reflected in the collection voucher or the contract, while the invoice usually shows the list price of the merchandise (i.e. $20,000).