Add Kleinunternehmerregelung (§19 UStG) support end-to-end

Checkout forces 0% VAT without de-grossing prices when the tenant is a
Kleinunternehmer (a business decision, not just an engineering default —
unlike the existing intra-community VAT exemption, which does de-gross).
Snapshotted onto the order at checkout time so a later toggle of the
company-settings checkbox never rewrites an already-issued invoice's tax
treatment — same reasoning as the existing vatExempt field.

Threaded through: checkout route, order creation/confirmation email,
on-demand invoice/Storno/Gutschrift downloads, the Bestellbestätigung
page, and the account order-detail page. The four storefront "inkl. X%
MwSt." price hints (shop grid, cart upsell, ToDo-Karten landing page,
homepage spotlight) drop that clause live when the setting is on. The
company-settings Live Preview reflects the checkbox in real time too.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

This commit is contained in:

Marco

2026-07-24 15:08:13 +00:00

parent 89dd11bf77

commit ba830947d2

23 changed files with 203 additions and 35 deletions

									
										app/company-settings-preview/page.tsx
									
		+1
		
												View File
												
				@@ -23,6 +23,7 @@ const FALLBACK: CompanySettings = {

				  sellerEmail: "",

				  vatId: "",

				  taxRatePercent: 19,

				  kleinunternehmer: false,

				  iban: null,

				  bic: null,

				};