diff --git a/test/integration/query/sanity/non_negativity_sanity_test.go b/test/integration/query/sanity/non_negativity_sanity_test.go
new file mode 100644
index 0000000..c295f2c
--- /dev/null
+++ b/test/integration/query/sanity/non_negativity_sanity_test.go
@@ -0,0 +1,251 @@
+package sanity
+
+// This test checks broad sanity invariants on allocation query output.
+// It intentionally validates the API response as an external consumer:
+// numeric fields must be finite, costs and usage metrics must be non-negative,
+// runtime minutes must not exceed the returned window, and computed resource
+// efficiencies must stay within their expected sanity ranges.
+
+import (
+	"fmt"
+	"math"
+	"testing"
+	"time"
+
+	"github.com/opencost/opencost-integration-tests/pkg/api"
+)
+
+const (
+	windowSlackMinutes = 0.1
+	// Efficiency tolerance allows for differences in time units and averaging methods.
+	// Request-average fields may use different bases (per-minute, per-second, etc.),
+	// so we allow efficiencies up to 5x to catch real issues while avoiding false
+	// positives from unit/reporting differences.
+	efficiencyTolerance = 5.0
+)
+
+func TestAllocationNonNegativitySanityChecks(t *testing.T) {
+	apiObj := api.NewAPI()
+
+	testCases := []struct {
+		name        string
+		window      string
+		aggregate   string
+		accumulate  string
+		includeidle string
+	}{
+		{name: "Today", window: "today", aggregate: "namespace", accumulate: "false", includeidle: "true"},
+		{name: "Yesterday", window: "yesterday", aggregate: "cluster", accumulate: "false", includeidle: "true"},
+		{name: "Last week", window: "week", aggregate: "service", accumulate: "false", includeidle: "true"},
+		{name: "Last 14 days", window: "14d", aggregate: "container", accumulate: "false", includeidle: "true"},
+		{name: "Custom", window: "%sT00:00:00Z,%sT00:00:00Z", aggregate: "namespace", accumulate: "false", includeidle: "true"},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			if tc.name == "Custom" {
+				now := time.Now().UTC()
+				tc.window = fmt.Sprintf(tc.window,
+					now.AddDate(0, 0, -2).Format("2006-01-02"),
+					now.AddDate(0, 0, -1).Format("2006-01-02"),
+				)
+			}
+
+			req := api.AllocationRequest{
+				Window:      tc.window,
+				Aggregate:   tc.aggregate,
+				Accumulate:  tc.accumulate,
+				IncludeIdle: tc.includeidle,
+			}
+
+			allocationResponse, err := apiObj.GetAllocation(req)
+			if err != nil {
+				t.Fatalf("failed to call /allocation: %v", err)
+			}
+			if allocationResponse.Code != 200 {
+				t.Fatalf("expected /allocation status 200, got %d", allocationResponse.Code)
+			}
+
+			for _, allocationSet := range allocationResponse.Data {
+				for key, item := range allocationSet {
+					itemName := item.Name
+					if itemName == "" {
+						itemName = key
+					}
+					checkAllocationItem(t, itemName, item)
+				}
+			}
+		})
+	}
+}
+
+func checkAllocationItem(t *testing.T, itemName string, item api.AllocationResponseItem) {
+	windowMinutes := item.Window.RunTime()
+
+	checkNonNegativeFields(t, itemName, map[string]float64{
+		"minutes": item.Minutes,
+
+		"cpuCores":              item.CPUCores,
+		"cpuCoreRequestAverage": item.CPUCoreRequestAverage,
+		"cpuCoreLimitAverage":   item.CPUCoreLimitAverage,
+		"cpuCoreUsageAverage":   item.CPUCoreUsageAverage,
+		"cpuCoreHours":          item.CPUCoreHours,
+
+		"gpuCount": item.GPUCount,
+		"gpuHours": item.GPUHours,
+
+		"networkTransferBytes": item.NetworkTransferBytes,
+		"networkReceiveBytes":  item.NetworkReceiveBytes,
+
+		"pvBytes":     item.PVBytes,
+		"pvByteHours": item.PVByteHours,
+
+		"ramBytes":              item.RAMBytes,
+		"ramByteRequestAverage": item.RAMBytesRequestAverage,
+		"ramByteLimitAverage":   item.RAMBytesLimitAverage,
+		"ramByteUsageAverage":   item.RAMBytesUsageAverage,
+		"ramByteHours":          item.RAMByteHours,
+
+		"totalEfficiency": item.TotalEfficiency,
+	})
+
+	// Cost adjustment fields may be negative by design, so only validate the
+	// core cost fields and idle cost values for non-negativity.
+	checkNonNegativeFields(t, itemName, map[string]float64{
+		"cpuCost":                item.CPUCost,
+		"cpuCostIdle":            item.CPUCostIdle,
+		"gpuCost":                item.GPUCost,
+		"gpuCostIdle":            item.GPUCostIdle,
+		"networkCost":            item.NetworkCost,
+		"networkCrossZoneCost":   item.NetworkCrossZoneCost,
+		"networkCrossRegionCost": item.NetworkCrossRegionCost,
+		"networkInternetCost":    item.NetworkInternetCost,
+		"loadBalancerCost":       item.LoadBalancerCost,
+		"pvCost":                 item.PersistentVolumeCost(),
+		"ramCost":                item.RAMCost,
+		"ramCostIdle":            item.RAMCostIdle,
+		"sharedCost":             item.SharedCost,
+		"totalCost":              item.TotalCost,
+	})
+
+	if item.Minutes > windowMinutes+windowSlackMinutes {
+		t.Fatalf(
+			"allocation sanity violation: item=%q field=minutes value=%f windowMinutes=%f",
+			itemName,
+			item.Minutes,
+			windowMinutes,
+		)
+	}
+
+	// Validate computed per-resource efficiencies (more precise than totalEfficiency)
+	checkComputedCPUEfficiency(t, itemName, item, windowMinutes)
+	checkComputedRAMEfficiency(t, itemName, item, windowMinutes)
+	checkComputedGPUEfficiency(t, itemName, item, windowMinutes)
+}
+
+func checkNonNegativeFields(t *testing.T, itemName string, fields map[string]float64) {
+	for field, value := range fields {
+		if math.IsNaN(value) || math.IsInf(value, 0) {
+			t.Fatalf(
+				"allocation sanity violation: item=%q field=%s value=%f is not finite",
+				itemName,
+				field,
+				value,
+			)
+		}
+
+		if value < 0 {
+			t.Fatalf(
+				"allocation sanity violation: item=%q field=%s value=%f is negative",
+				itemName,
+				field,
+				value,
+			)
+		}
+	}
+}
+
+// checkComputedCPUEfficiency computes CPU efficiency from request-average and usage data
+// and validates it is within [0, 1 + tolerance].
+// cpuEfficiency = cpuCoreHours / (cpuCoreRequestAverage * minutes / 60)
+// Skips check if CPU request is negligible (< 1e-6).
+func checkComputedCPUEfficiency(t *testing.T, itemName string, item api.AllocationResponseItem, windowMinutes float64) {
+	if item.CPUCoreRequestAverage < 1e-6 || windowMinutes <= 0 {
+		// Skip check if CPU request is negligible or window is zero
+		return
+	}
+
+	cpuRequestedHours := item.CPUCoreRequestAverage * windowMinutes / 60.0
+	if cpuRequestedHours <= 0 {
+		return
+	}
+
+	cpuEfficiency := item.CPUCoreHours / cpuRequestedHours
+
+	// Allow small rounding tolerance above 1.0
+	if cpuEfficiency < 0 || cpuEfficiency > (1.0+efficiencyTolerance) {
+		t.Fatalf(
+			"allocation sanity violation: item=%q field=cpuEfficiency value=%f is outside expected range [0,%.2f]",
+			itemName,
+			cpuEfficiency,
+			1.0+efficiencyTolerance,
+		)
+	}
+}
+
+// checkComputedRAMEfficiency computes RAM efficiency from request-average and usage data
+// and validates it is within [0, 1 + tolerance].
+// ramEfficiency = ramByteHours / (ramByteRequestAverage * minutes / 60)
+// Skips check if RAM request is negligible (< 1e-6).
+func checkComputedRAMEfficiency(t *testing.T, itemName string, item api.AllocationResponseItem, windowMinutes float64) {
+	if item.RAMBytesRequestAverage < 1e-6 || windowMinutes <= 0 {
+		// Skip check if RAM request is negligible or window is zero
+		return
+	}
+
+	ramRequestedHours := item.RAMBytesRequestAverage * windowMinutes / 60.0
+	if ramRequestedHours <= 0 {
+		return
+	}
+
+	ramEfficiency := item.RAMByteHours / ramRequestedHours
+
+	// Allow small rounding tolerance above 1.0
+	if ramEfficiency < 0 || ramEfficiency > (1.0+efficiencyTolerance) {
+		t.Fatalf(
+			"allocation sanity violation: item=%q field=ramEfficiency value=%f is outside expected range [0,%.2f]",
+			itemName,
+			ramEfficiency,
+			1.0+efficiencyTolerance,
+		)
+	}
+}
+
+// checkComputedGPUEfficiency computes GPU efficiency from request-average and usage data
+// and validates it is within [0, 1 + tolerance].
+// gpuEfficiency = gpuHours / (gpuRequestAverage * minutes / 60)
+// Skips check if GPU request is negligible (< 1e-6).
+func checkComputedGPUEfficiency(t *testing.T, itemName string, item api.AllocationResponseItem, windowMinutes float64) {
+	// GPU request average is in the GPUAllocation nested struct
+	if item.GPUAllocation.GPURequestAverage < 1e-6 || windowMinutes <= 0 {
+		// Skip check if GPU request is negligible or window is zero
+		return
+	}
+
+	gpuRequestedHours := item.GPUAllocation.GPURequestAverage * windowMinutes / 60.0
+	if gpuRequestedHours <= 0 {
+		return
+	}
+
+	gpuEfficiency := item.GPUHours / gpuRequestedHours
+
+	// Allow small rounding tolerance above 1.0
+	if gpuEfficiency < 0 || gpuEfficiency > (1.0+efficiencyTolerance) {
+		t.Fatalf(
+			"allocation sanity violation: item=%q field=gpuEfficiency value=%f is outside expected range [0,%.2f]",
+			itemName,
+			gpuEfficiency,
+			1.0+efficiencyTolerance,
+		)
+	}
+}
diff --git a/test/integration/query/sanity/test.bats b/test/integration/query/sanity/test.bats
new file mode 100644
index 0000000..3d9cc52
--- /dev/null
+++ b/test/integration/query/sanity/test.bats
@@ -0,0 +1,11 @@
+setup() {
+    : # nothing to set up
+}
+
+teardown() {
+    : # nothing to tear down
+}
+
+@test "query allocation non-negativity sanity checks" {
+    go test ./test/integration/query/sanity -run TestAllocationNonNegativitySanity -count=1 -v
+}
\ No newline at end of file