Is a contract required when paying an invoice?

Question

Freelance

Hello.
Can I just issue an invoice without a contract? For example, an invoice for an advance payment, an invoice for another stage of work, and then an invoice for the balance of payment.
Simply, given the remoteness, it seems to be much more convenient than sending contracts to each other, and in which case prepaid insurance and the risk of not receiving the balance looks better than litigation under the contract.

Answer 1

The contract does not interfere with prepayment and payment for completed stages.
Electronic document management allows you to exchange contracts in five seconds .

Answer 2

You can without a contract. The invoice will be essentially a contract if you specify all the essential conditions.
You have a misunderstanding about the contract. If a normal contract, then this just reduces the risk. And if there is no contract, then the money will be transferred (it is possible without an account), do the work, and then the money can be demanded back as unjust enrichment. And they will receive it if you have nothing to confirm that it was an advance payment, and the ordered work has been completed. And there may be other "little things" - for example, the customer will say that you did something wrong.