Can an AI agent prepare VAT or sales tax returns?

Yes, it can prepare them; it should not submit them. An AI agent can reconcile tax control accounts, review transactions for wrong tax codes, build the workpapers and draft the return. Submitting is a declaration to a tax authority by an accountable person, who should not be the one who prepared the figures.

What does preparation involve?

A VAT or sales tax return summarises tax charged on sales and, where the regime allows, tax paid on purchases. The figures come from the ledger, but the ledger is only as good as the tax codes applied to each transaction. Most return errors start as coding errors: a purchase coded as fully recoverable when it is partly exempt, a cross-border sale coded at the domestic rate, a supplier invoice that never carried valid tax details.

An agent can review every transaction in the period, not a sample. It can check that the tax code fits the supplier, customer, item and location, that purchase invoices show what the regime requires for recovery, and that the tax control account reconciles to the return. The step-by-step approach is in how to prepare VAT return workpapers with an AI agent.

What may the agent prepare, and where must it stop?

The separation of duties sits in the last two rows. The person who submits is declaring the return correct. They should review the agent's workpapers and the tax lead's decisions, and they should not have prepared the figures themselves. The tax payment then follows the normal payment release rules.

Why should the agent never submit?

Because a submitted return is hard to undo and the consequences fall on the business. Corrections usually mean a formal adjustment process, and errors can bring penalties and interest. That makes submission a depth 4 action in substance. More than that, the declaration on a return is made by a person on the business's behalf. It is not something an agent can make.

There is also a practical reason. Tax authorities and auditors will ask who reviewed the return and what they checked. "The agent prepared it and a person submitted it after reviewing these workpapers" is an answer. "The agent submitted it" is not.

An illustrative example

Take an online retailer selling to consumers at home and abroad. At quarter end, the agent reviews 18,000 sales transactions and 2,400 purchase invoices.

It flags three issues. A batch of sales to customers in another country was charged at the domestic rate, though the business is registered there and should charge that country's tax. A marketing agency's invoices lack the agency's tax registration number, so tax on them may not be recoverable until corrected invoices arrive. And the tax control account differs from the draft return by 2,150, traced to a credit note posted with no tax code.

The tax lead decides the foreign sales need correcting in the next return under the relevant correction rules, requests new invoices from the agency and has the credit note recoded. The agent updates the workpapers. The finance director reviews and submits the return.

What controls make it safe?

• Full-population review. Every transaction checked, not a sample.
• Tax decisions recorded. Each flagged item shows the tax lead's decision and reason.
• Workpapers linked to the return. Every box traces to its workpaper.
• No submission capability. The agent cannot access the tax authority's filing service.
• Independent submitter. Named, and not the preparer.

The same pattern applies to corporate tax provision workpapers. Commission plans can also have tax consequences when they are paid, which is one reason calculating sales commissions runs through a person before payroll. The wider controls are in AI agents for finance: books you can audit.