 I looked through the reporting code, and I do not see a dedicated sales tax report.

  What exists today:

  - The report menu has Financial Summary, AR Aging, Balance Sheet, and Sales & Income, but no sales-tax-specific report card in /Y:/PCC/
    PowderCoatingApp/src/PowderCoating.Web/Views/Reports/Landing.cshtml:147 and /Y:/PCC/PowderCoatingApp/src/PowderCoating.Web/Views/Reports/
    Landing.cshtml:211.
  - The reporting service only exposes four finance reports in /Y:/PCC/PowderCoatingApp/src/PowderCoating.Application/Interfaces/
    IFinancialReportService.cs:13 through /Y:/PCC/PowderCoatingApp/src/PowderCoating.Application/Interfaces/IFinancialReportService.cs:22.
  - Sales & Income does surface tax, but only as a total and per-invoice column in /Y:/PCC/PowderCoatingApp/src/PowderCoating.Infrastructure/
    Services/FinancialReportService.cs:406, /Y:/PCC/PowderCoatingApp/src/PowderCoating.Infrastructure/Services/FinancialReportService.cs:419,
    and /Y:/PCC/PowderCoatingApp/src/PowderCoating.Web/Views/Reports/SalesAndIncome.cshtml:268.
  - The good news is the underlying data is already there: invoices store TaxAmount and SalesTaxAccountId in /Y:/PCC/PowderCoatingApp/src/
    PowderCoating.Core/Entities/Invoice.cs:23 and /Y:/PCC/PowderCoatingApp/src/PowderCoating.Core/Entities/Invoice.cs:55, and the chart of
    accounts seeds 2200 Sales Tax Payable in /Y:/PCC/PowderCoatingApp/src/PowderCoating.Infrastructure/Services/SeedDataService.Accounts.cs:59.

  Plan I’d recommend:

  1. Add a new Sales Tax report under Reports > Finance with date range filters, matching the existing report pattern in /Y:/PCC/PowderCoatingApp/
     src/PowderCoating.Web/Controllers/ReportsController.cs:993.
  2. Build a SalesTaxReportDto plus GetSalesTaxReportAsync(...) in the reporting interface/service.
  3. Phase 1 report contents:

  - Total taxable sales
  - Total non-taxed sales
  - Total sales tax billed
  - Breakdown by sales-tax liability account
  - Breakdown by month
  - Invoice detail grid: invoice date, invoice #, customer, subtotal, tax %, tax amount, total, amount paid, balance due, status, tax account

  4. Add PDF export, and probably CSV too, since this is the kind of report people hand to accountants.
  5. Put a report card on the Reports landing page and gate it the same way as the other accounting reports.
  
   Two important caveats before we build it:

  - The biggest decision is whether this should be invoice-basis or cash-basis. The current model naturally supports invoice-basis first.
  - Refunds and credit memos do not appear to store a separate tax adjustment value in /Y:/PCC/PowderCoatingApp/src/PowderCoating.Core/Entities/
    Refund.cs:1 and /Y:/PCC/PowderCoatingApp/src/PowderCoating.Core/Entities/CreditMemo.cs:1, so phase 1 would be best framed as “sales tax billed
    on invoices,” with net tax adjustments as a phase 2 enhancement.

  My recommendation is:

  - Build phase 1 as an invoice-basis Sales Tax Liability report
  - Label zero-tax invoices as non-taxed sales
  - Add cash-basis and refund/credit tax adjustments later if you need filing-grade accuracy for more complex cases

  If you want, I can turn this plan into the actual report next.