diff --git a/src/PowderCoating.Web/Controllers/JobsController.cs b/src/PowderCoating.Web/Controllers/JobsController.cs
index 2fd3a07..2ba68e1 100644
--- a/src/PowderCoating.Web/Controllers/JobsController.cs
+++ b/src/PowderCoating.Web/Controllers/JobsController.cs
@@ -422,7 +422,7 @@ public class JobsController : Controller
             // Populate Edit Items wizard data (inline modal on Details page)
             var wizardCosts = await _pricingService.GetOperatingCostsAsync(job.CompanyId);
             await PopulateJobItemDropDownsAsync(job.CompanyId, wizardCosts?.OvenOperatingCostPerHour ?? 45m);
-            ViewBag.WizardTaxPercent = wizardCosts?.TaxPercent ?? 0m;
+            ViewBag.WizardTaxPercent = await GetEffectiveTaxPercentAsync(job.CustomerId, wizardCosts?.TaxPercent ?? 0m);
 
             // Display the pricing snapshot stored when items were last saved.
             // Never recalculate on load — operating cost changes must not retroactively alter existing jobs.
@@ -1130,7 +1130,7 @@ public class JobsController : Controller
                 }
                 var totals = await _pricingService.CalculateQuoteTotalsAsync(
                     dto.JobItems, companyId, dto.CustomerId,
-                    createCosts?.TaxPercent ?? 0m,
+                    await GetEffectiveTaxPercentAsync(dto.CustomerId, createCosts?.TaxPercent ?? 0m),
                     dto.DiscountType, dto.DiscountValue, dto.IsRushJob, createOvenRate, job.OvenBatches, job.OvenCycleMinutes);
 
                 job.FinalPrice             = totals.Total;
@@ -1598,7 +1598,7 @@ public class JobsController : Controller
                 }
                 var totals = await _pricingService.CalculateQuoteTotalsAsync(
                     dto.JobItems, companyId, dto.CustomerId,
-                    editCosts?.TaxPercent ?? 0m,
+                    await GetEffectiveTaxPercentAsync(dto.CustomerId, editCosts?.TaxPercent ?? 0m),
                     dto.DiscountType, dto.DiscountValue, dto.IsRushJob, editOvenRate, job.OvenBatches, job.OvenCycleMinutes);
                 job.FinalPrice             = totals.Total;
                 job.OvenBatchCost          = totals.OvenBatchCost;
@@ -2930,7 +2930,7 @@ public class JobsController : Controller
             JobId            = job.Id,
             JobNumber        = job.JobNumber,
             CustomerId       = job.CustomerId,
-            TaxPercent       = costs?.TaxPercent ?? 0m,
+            TaxPercent       = await GetEffectiveTaxPercentAsync(job.CustomerId, costs?.TaxPercent ?? 0m),
             OvenCostId       = job.OvenCostId,
             OvenBatches      = job.OvenBatches > 0 ? job.OvenBatches : 1,
             OvenCycleMinutes = job.OvenCycleMinutes,
@@ -2967,7 +2967,7 @@ public class JobsController : Controller
         {
             ModelState.AddModelError("", "Please add at least one job item.");
             var costs = await _pricingService.GetOperatingCostsAsync(currentUser.CompanyId);
-            model.TaxPercent = costs?.TaxPercent ?? 0m;
+            model.TaxPercent = await GetEffectiveTaxPercentAsync(job.CustomerId, costs?.TaxPercent ?? 0m);
             await PopulateJobItemDropDownsAsync(currentUser.CompanyId, costs?.OvenOperatingCostPerHour ?? 45m);
             ViewBag.ComplexitySimplePercent   = costs?.ComplexitySimplePercent   ?? 0m;
             ViewBag.ComplexityModeratePercent = costs?.ComplexityModeratePercent ?? 5m;
@@ -3020,9 +3020,11 @@ public class JobsController : Controller
                 if (oven != null && oven.CompanyId == currentUser.CompanyId)
                     ovenRateOverride = oven.CostPerHour;
             }
+            var updateCosts = await _pricingService.GetOperatingCostsAsync(currentUser.CompanyId);
             var totals = await _pricingService.CalculateQuoteTotalsAsync(
                 model.JobItems, currentUser.CompanyId, job.CustomerId,
-                model.TaxPercent, job.DiscountType.ToString(), job.DiscountValue, job.IsRushJob,
+                await GetEffectiveTaxPercentAsync(job.CustomerId, updateCosts?.TaxPercent ?? 0m),
+                job.DiscountType.ToString(), job.DiscountValue, job.IsRushJob,
                 ovenRateOverride, job.OvenBatches, job.OvenCycleMinutes);
 
             job.FinalPrice             = totals.Total;
@@ -3043,7 +3045,7 @@ public class JobsController : Controller
             _logger.LogError(ex, "Error updating items for job {JobId}", job.Id);
             TempData["Error"] = "An error occurred while saving job items.";
             var costs = await _pricingService.GetOperatingCostsAsync(currentUser.CompanyId);
-            model.TaxPercent = costs?.TaxPercent ?? 0m;
+            model.TaxPercent = await GetEffectiveTaxPercentAsync(job.CustomerId, costs?.TaxPercent ?? 0m);
             await PopulateJobItemDropDownsAsync(currentUser.CompanyId, costs?.OvenOperatingCostPerHour ?? 45m);
             return View("EditItems", model);
         }
@@ -3110,7 +3112,7 @@ public class JobsController : Controller
             }
             var totals = await _pricingService.CalculateQuoteTotalsAsync(
                 remainingDtos, currentUser.CompanyId, job.CustomerId,
-                costs?.TaxPercent ?? 0m,
+                await GetEffectiveTaxPercentAsync(job.CustomerId, costs?.TaxPercent ?? 0m),
                 job.DiscountType.ToString(), job.DiscountValue, job.IsRushJob,
                 deleteOvenRate, job.OvenBatches, job.OvenCycleMinutes);
             job.FinalPrice             = totals.Total;
@@ -3239,6 +3241,21 @@ public class JobsController : Controller
     /// Converts a <see cref="QuotePricingResult"/> into the DTO used for both display and JSON snapshot storage.
     /// All save paths (Create, Edit, UpdateItems, DeleteJobItem) call this so the snapshot is always consistent.
     /// </summary>
+    /// <summary>
+    /// Returns the effective tax rate for a job, respecting customer tax-exempt status.
+    /// Always call this instead of using costs.TaxPercent directly so tax-exempt customers
+    /// are never charged tax when a job is saved or recalculated.
+    /// </summary>
+    private async Task<decimal> GetEffectiveTaxPercentAsync(int? customerId, decimal companyDefaultRate)
+    {
+        if (customerId is > 0)
+        {
+            var customer = await _unitOfWork.Customers.GetByIdAsync(customerId.Value);
+            if (customer?.IsTaxExempt == true) return 0m;
+        }
+        return companyDefaultRate;
+    }
+
     private static QuotePricingBreakdownDto BuildPricingSnapshotDto(QuotePricingResult pr) =>
         new QuotePricingBreakdownDto
         {