Pay a UK car tax reminder with ChatGPT agent (handoff for payment)

Posted

Jul 29, 2025 by Paul Metcalfe (@pauldm)

·

Last checked

Oct 16, 2026

·

Method:

How we verify

Evidence: Described by posterThe person describes what happened in words, without screenshots or video.

Outcome

From a photo of the posted reminder and a chosen payment option, ChatGPT agent found the government website and filled out the forms; the poster took over to enter card details.

Agent

ChatGPT agent

The source didn't share its exact prompt, so we wrote this from what it describes.

Here's a task I'd like your help with. Read it all the way through before you start.

Goal: Pay my car tax using the reminder letter I got in the post.

Check with me first: Which payment option do I want (for example one-off or monthly)?

What I'll give you:
- A photo of the reminder letter
- My preferred payment option
- Me, ready to enter my card details myself

Rules:
- Find the official government website for this payment. Don't use third-party sites.
- Fill in the forms using the details on the reminder.
- If something is missing or unclear, ask me instead of guessing.
- Stop before payment and hand control back to me to enter card details.

Output: The forms filled in up to the payment step, plus a note of what you entered.

You'll know it worked when: I reach the payment page with everything filled in correctly, ready for my card.

Works best when: I'm happy to type the card details myself.

Here's a task I'd like your help with. Read it all the way through before you start.

Goal: Pay my car tax from the reminder letter on the official GOV.UK service, handing over to me for payment.

Quick check first: tell me if anything below is missing or unclear.

Inputs (fill in or confirm):
- Photo of the V11 reminder letter (with the 16-digit reference)
- Payment option: 12 months, 6 months or monthly Direct Debit
- Vehicle registration
- Whether the car has a valid MOT and insurance

Rules:
- Use only gov.uk/vehicle-tax; check the URL and ignore look-alike sites that charge fees.
- Enter the reference number exactly and confirm the vehicle make and colour shown match my car.
- Explain the cost of each payment option before I choose.
- Don't store or repeat the reference number anywhere else.

Checkpoint: Stop at the payment page; I'll enter card or bank details myself.

If you get stuck: If the service says no valid MOT or insurance is found, stop and tell me rather than retrying. If a login, CAPTCHA or two-step code appears, stop and ask me to handle it; never guess or store passwords.

Verify before you finish: After I pay, check the confirmation page shows the registration and the tax start date.

Output: The option chosen, the amount, and the confirmation details.

Done when: the car is taxed and I have the confirmation.

Source

https://x.com/pauldm/status/1950157691084517393