No difference between a deposit and a retainer
A retainer paid by an architect's or lawyer's client is a form of payment on account.
Issuing an invoice
1st invoice: advance payment
When you ask your client for a deposit, you issue a deposit invoice. This invoice is subject to VAT and the amount invoiced will be included in your income for the period.
👇 Example
2nd invoice: balance
When you make the final invoice, you only invoice the balance: total amount - amount already invoiced on account.
💡 For greater clarity for your customer, indicate the total amount of the service on the final invoice. And add a negative line "Advance already invoiced" showing the amount already invoiced as an advance. This way, the customer can see exactly what your service cost.
👇 Example
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