23 · Tax, receipts & notifications

Sales tax settings (tenant), receipt templates/send channels, and email/SMS plumbing. Distinct from HR payroll tax under DocHub 21.

Sales tax ≠ payroll tax Receipts → email/SMS/print

Sales tax (tenant commerce)

Surface	Path / API
Admin UI	`/admin/taxes` · Taxes.jsx
API	`taxSettings.routes.js` — settings, rates CRUD, `/calculate`
Services	`tax.service.js` · `taxSettings.service.js`

POS cart carries taxRateBps / taxCents into finalize → invoice. Reports include accounting/taxes.

HR tax is separate Employer EIN, W4, payroll tax rates live under /admin/hr/business-tax-info and /admin/hr/tax-rates on the HR DB — see DocHub 21.

Receipts

flowchart LR
  INV[Invoice / sale]
  TPL[Receipt templates]
  GEN[Generate / preview]
  CH[Channels]
  INV --> GEN
  TPL --> GEN
  GEN --> CH
  CH --> E[Email]
  CH --> S[SMS]
  CH --> P[Print / Bridge]
  CH --> V[View token URL]

API area	Examples
`/api/receipts`	view/:token, templates/current, preview, email, SMS, send
`receipt.routes` (templates/generate)	CRUD templates, PDF, print, email
UI	`/admin/receipt-templates` · branding often ties logos

Services: receiptGeneration, receiptRenderer. Bridge can carry print jobs.

Email & SMS

Piece	Role
`/api/email`	Settings, status, test, send templates, invoice email, logs — see DocHub 29
`/admin/mail-settings`	UI for mail config
`/admin/tools/mailer`	Dev mailer tester
`/api/admin/email-templates`	Template admin (tickets etc.)
`email.service.js` · `mailer.js`	Send pipeline
`sms.js`	SMS helper used by receipts/notifications
Ticket notifications	ticketNotification.service on ticket events
Password reset	Auth flows use mailer

Ops dependency Live email/SMS quality depends on env SMTP/provider credentials — not just code paths existing.

File anchors

Concern	Path
Tax	`taxSettings.routes.js` · Taxes.jsx
Receipts	`receipts.routes.js` · `receipt.routes.js` · ReceiptTemplates.jsx
Email	`email.routes.js` · MailSettings · mailer services
SMS	`backend/services/sms.js`
OAO	21 tax · 22 receipts · 23 email-sms HTML