When must I issue an invoice?

Within 15 days of the taxable supply date (Art. 71(1) EU VAT Directive / § 71(1) Slovak VAT Act).

What if the client does not pay?

After the due date you are entitled to statutory late-payment interest. You can enforce the invoice via a payment order or court proceedings.

Is an electronic invoice as valid as a paper one?

Yes. An electronic invoice is fully valid, provided its authenticity and integrity are ensured throughout the 10-year archiving obligation.

What is a variable symbol?

A variable symbol is a numeric payment identifier that allows the recipient to match a payment to a specific invoice. We recommend using the invoice number as the variable symbol.

Consultants & advisors Invoice

Invoice for Consultants & advisors

Consultants bill by the hour, by milestone, or on retainer — and each model demands a clearly worded invoice. A poorly formatted invoice slows payment or triggers unnecessary back-and-forth with the client's accounting team. zipzipdoc generates a correctly formatted invoice in seconds so you get paid quickly and without complications.

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Consultants & advisors

A consultant works with sensitive information and every new client deserves properly handled confidentiality and clear contractual terms. zipzipdoc lets you prepare a tailored consulting agreement and NDA in minutes — without repeatedly contacting a lawyer.

Invoice

Create an invoice including VAT, company ID, taxable event date, due date and variable symbol. Send it directly to the client.

When to use a Invoice

After delivering goods or providing a service
For monthly billing of recurring services
When the client needs a tax document for VAT deduction
For advance payment before work begins

What you get

VAT and tax fields
Logo and branding
Due date and penalties
Send by email

Benefits for Consultants & advisors

AI tailors the contract to the project
Bulk NDA sending
Version-by-version audit log

FAQ

Questions about Invoice

Supplier and buyer IDs, invoice date, taxable supply date, invoice number, description of supply, VAT base, VAT rate and amount, total amount payable.

How does zipzipdoc compare to alternatives?

See detailed comparisons with popular e-signature tools.

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