Deposit and VAT

First, to request a deposit, use a sales quote, not an invoice. You can rename the sales quote anything you want, such as Pro Forma Invoice, Proposal, Deposit Request, etc. See this Guide:

When final delivery is made, raise a sales invoice for the full price. The customer’s deposit, assuming it was received before work began, will be automatically applied.

Second, if all VAT is included in the 2,000, just mark the forms as being tax-inclusive. See this Guide:

But if 2,000 includes VAT, why are you adding another 14%? Do not charge VAT again. Further, your numbers don’t make sense. If your VAT rate is 14%, VAT on 1574.39 should be 220.41, and the total should be 1794.80.