diff --git a/app/services/document_processor.py b/app/services/document_processor.py
index dbf1e27..d6acd45 100644
--- a/app/services/document_processor.py
+++ b/app/services/document_processor.py
@@ -97,7 +97,12 @@ class DocumentProcessor:
             - Format location as "Province/State, Country" (e.g., "Ontario, Canada" or "California, USA")
             - If location not shown on receipt, return null for location (system will use user location as fallback)
             
-            - If tax_amount is NOT clearly shown on receipt, calculate it based on location:
+            TAX EXTRACTION RULES (IMPORTANT):
+            - If tax is EXPLICITLY shown on receipt (even if $0 or 0%), use that exact value:
+              * If receipt shows "Tax: $0", "Tax: $0.00", "Tax (0%)", or similar → set tax_amount to 0.00 and calculated_tax to null
+              * If receipt shows any other tax amount → set tax_amount to that value and calculated_tax to null
+            
+            - If tax_amount is NOT shown or UNCLEAR on receipt, calculate it based on location:
               * Ontario, Canada: 13% HST
               * Quebec, Canada: 9.975% QST + 5% GST = 14.975% total
               * British Columbia, Canada: 12% (5% GST + 7% PST)
@@ -106,9 +111,7 @@ class DocumentProcessor:
               * New York, USA: ~8.875% (varies by locality)
               * Texas, USA: 6.25%
               * For other locations, estimate based on typical rates
-            - Store calculated tax in "calculated_tax" field (set to null if tax clearly shown)
-            - If tax is clearly shown on receipt, use that value for tax_amount and set calculated_tax to null
-            - If tax is clearly shown on the receipt as 0%, set tax_amount to 0 and calculated_tax to null
+              * Store calculated tax in "calculated_tax" field and set tax_amount to the calculated value
             
             DEPRECIATION RULES:
             - Determine if item is a depreciable asset (vehicles, machinery, equipment, computers, furniture, buildings)
@@ -250,7 +253,12 @@ class DocumentProcessor:
             - Format location as "Province/State, Country" (e.g., "Ontario, Canada" or "California, USA")
             - If location not shown on receipt, return null for location (system will use user location as fallback)
             
-            - If tax_amount is NOT clearly shown on receipt, calculate it based on location:
+            TAX EXTRACTION RULES (IMPORTANT):
+            - If tax is EXPLICITLY shown on receipt (even if $0 or 0%), use that exact value:
+              * If receipt shows "Tax: $0", "Tax: $0.00", "Tax (0%)", or similar → set tax_amount to 0.00 and calculated_tax to null
+              * If receipt shows any other tax amount → set tax_amount to that value and calculated_tax to null
+            
+            - If tax_amount is NOT shown or UNCLEAR on receipt, calculate it based on location:
               * Ontario, Canada: 13% HST
               * Quebec, Canada: 9.975% QST + 5% GST = 14.975% total
               * British Columbia, Canada: 12% (5% GST + 7% PST)
@@ -259,8 +267,7 @@ class DocumentProcessor:
               * New York, USA: ~8.875% (varies by locality)
               * Texas, USA: 6.25%
               * For other locations, estimate based on typical rates
-            - Store calculated tax in "calculated_tax" field (set to null if tax clearly shown)
-            - If tax is clearly shown on receipt, use that value for tax_amount and set calculated_tax to null
+              * Store calculated tax in "calculated_tax" field and set tax_amount to the calculated value
             
             DEPRECIATION RULES:
             - Determine if item is a depreciable asset (vehicles, machinery, equipment, computers, furniture, buildings)