ThiqahIT Solutions
Case study · Invoicing & Indirect Tax

Invoicing and Sales Tax Control for a High-Volume Auto Service Business

A franchised auto service business issued more than 20,000 invoices a month, each combining parts, labour, tyres and fees. We kept every invoice accurate and every sales tax filing clean for seven years.

The client

A franchised auto service business in California, owned and operated by our partner from 2019 to 2026.

The challenge

Every repair order had to be priced, taxed, authorised by the customer and recorded correctly, then reconciled to the books and the sales and use tax return, at a volume that left no room for manual clean-up.

Our approach

Over seven years, our partner:

  • Ran invoicing on RO Writer, the shop management system, checking every repair order, invoice and customer record for completeness, accuracy and authorisation.
  • Reconciled sales and operational data daily to weekly.
  • Reconciled the general ledger monthly with the external accountants.
  • Managed sales and use tax compliance, reconciliations and filings.
  • Introduced internal controls and process automation to keep records audit-ready.
The results
  • More than 20,000 invoices a month processed.
  • Seven years with no filing issues.
  • Reconciliations completed daily to weekly.
  • Audit-ready records throughout.
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