Files
supabase/apps/studio/components/interfaces/Billing
Kanishk DudejaandIgnacio Dobronich 5d942e2a46 refactor(billing): allow GB VAT tax IDs for Isle of Man customers (#43640)
### Summary

This PR adds support for Isle of Man customers to use GB VAT tax IDs.
Isle of Man uses the UK VAT system, so Orb requires country: 'GB' for
validation - but the billing address country is IM.

- Adds an IM VAT entry to `TAX_IDS` with a new `taxCountryIso2` override
field, so the UI shows "IM VAT" while sending country: 'GB' to Orb
- Introduces `getEffectiveTaxCountry()` to resolve the correct country
code for Orb
- Introduces `resolveStoredTaxId()` to map stored Orb data back to the
correct UI entry, using billing address country to disambiguate IM vs GB
- Updates all three billing forms to use these utilities: Billing
Settings page, Add Payment Method modal and Update Billing Address modal

### Testing

#### Automated tests

I've added unit tests in this PR

#### Manual tests

You can use the following country/city/postal code combinations to test:

- Isle of Man, Douglas, IM1 2LE
- United Kingdom, Crumlin, BT29 4AA

**Billing Settings page**

- Select Isle of Man as billing country → tax ID dropdown shows "Isle of
Man - IM VAT"
- Select United Kingdom as billing country → tax ID dropdown shows
"United Kingdom - UK VAT" / "United Kingdom - GB VAT" (not "IM VAT")
- Select IM VAT, enter a valid GB VAT number, save → check network tab,
Orb receives country: 'GB'
- Reload page for an IM customer with existing tax ID → "IM VAT" is
pre-selected (not "UK VAT")
- Reload page for a GB customer with existing tax ID → "UK VAT" is
pre-selected (no regression)
- Change country from IM to GB → available tax IDs update, IM VAT no
longer shown

**Add Payment Method modal**

- Open modal for an IM customer with existing tax ID → "IM VAT" is
pre-selected
- Check "I'm purchasing as a business", select Isle of Man in Stripe
address → tax ID dropdown shows "IM VAT"
- Check "I'm purchasing as a business", select United Kingdom in Stripe
address → tax ID dropdown shows "UK VAT" / "GB VAT"
- Submit with IM VAT → check network tab, tax ID is saved with country:
'GB'
- Open modal for a GB customer → no regression, "UK VAT" shown as before

**Update Billing Address modal** 

Appears for paid orgs missing a billing address

- Open modal for an IM customer with existing tax ID → "IM VAT" is
pre-selected
- Open modal for a GB customer with existing tax ID → "UK VAT" is
pre-selected
- Fill in IM address + IM VAT and save → saves correctly, modal closes

---------

Co-authored-by: Ignacio Dobronich <ignacio@dobronich.com>
2026-03-20 21:48:56 +05:30
..