diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2681a0e58c..ce62d05028 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,9 @@ The format is based on [Keep a Changelog]
 
 ## [Unreleased]
 
+- Add contextual information when incorrect data is in a confirmation report
+- Remove thousand seperators from numeric columns in confirmation reports
+
 ## [Release 078] - 2020-06-22
 
 - Remove banking_name when scrubbing personal data from a claim
diff --git a/app/models/payment_confirmation.rb b/app/models/payment_confirmation.rb
index 08a523fa45..f8db66e4e9 100644
--- a/app/models/payment_confirmation.rb
+++ b/app/models/payment_confirmation.rb
@@ -82,18 +82,22 @@ def update_payment_fields(payment, row)
     end
 
     payment.payroll_reference = row["Payroll Reference"]
-    payment.gross_value = row["Gross Value"]
-    payment.national_insurance = row["NI"]
-    payment.employers_national_insurance = row["Employers NI"]
-    payment.student_loan_repayment = row["Student Loans"]
-    payment.tax = row["Tax"]
-    payment.net_pay = row["Net Pay"]
-    payment.gross_pay = row["Gross Value"].to_d - row["Employers NI"].to_d
+    payment.gross_value = cast_as_numeric(row["Gross Value"])
+    payment.national_insurance = cast_as_numeric(row["NI"])
+    payment.employers_national_insurance = cast_as_numeric(row["Employers NI"])
+    payment.student_loan_repayment = cast_as_numeric(row["Student Loans"])
+    payment.tax = cast_as_numeric(row["Tax"])
+    payment.net_pay = cast_as_numeric(row["Net Pay"])
+    payment.gross_pay = cast_as_numeric(row["Gross Value"]).to_d - cast_as_numeric(row["Employers NI"]).to_d
 
     if payment.save(context: :upload)
       updated_payment_ids.add(payment.id)
     else
-      errors.append("The claim at line #{@line_number} has invalid data")
+      errors.append("The claim at line #{@line_number} has invalid data - #{payment.errors.full_messages.to_sentence}")
     end
   end
+
+  def cast_as_numeric(number)
+    number&.gsub(",", "")
+  end
 end
diff --git a/spec/models/payment_confirmation_spec.rb b/spec/models/payment_confirmation_spec.rb
index 8ed83acb7f..8a4b124f39 100644
--- a/spec/models/payment_confirmation_spec.rb
+++ b/spec/models/payment_confirmation_spec.rb
@@ -6,7 +6,7 @@
     <<~CSV
       Payroll Reference,Gross Value,Payment ID,NI,Employers NI,Student Loans,Tax,Net Pay
       DFE00001,487.48,#{payroll_run.payments[0].id},33.9,38.98,0,89.6,325
-      DFE00002,904.15,#{payroll_run.payments[1].id},77.84,89.51,40,162.8,534
+      DFE00002,"1,211.15",#{payroll_run.payments[1].id},77.84,89.51,40,162.8,534
     CSV
   end
   let(:file) do
@@ -36,13 +36,13 @@
       expect(first_payment.gross_pay).to eq("448.5".to_d)
 
       expect(second_payment.payroll_reference).to eq("DFE00002")
-      expect(second_payment.gross_value).to eq("904.15".to_d)
+      expect(second_payment.gross_value).to eq("1211.15".to_d)
       expect(second_payment.national_insurance).to eq("77.84".to_d)
       expect(second_payment.employers_national_insurance).to eq("89.51".to_d)
       expect(second_payment.student_loan_repayment).to eq("40".to_d)
       expect(second_payment.tax).to eq("162.8".to_d)
       expect(second_payment.net_pay).to eq("534".to_d)
-      expect(second_payment.gross_pay).to eq("814.64".to_d)
+      expect(second_payment.gross_pay).to eq("1121.64".to_d)
     end
 
     it "populates the payroll run's confirmation_report_uploaded_by and sets a payment date of the upcoming Friday" do
@@ -182,14 +182,14 @@
     let(:csv) do
       <<~CSV
         Payroll Reference,Gross Value,Payment ID,NI,Employers NI,Student Loans,Tax,Net Pay
-        DFE00001,,#{payroll_run.payments[0].id},33.9,38.98,0,89.6,325
+        DFE00001,,#{payroll_run.payments[0].id},,38.98,0,89.6,325
         DFE00002,904.15,#{payroll_run.payments[1].id},77.84,89.51,40,162.8,534
       CSV
     end
 
     it "fails and populates its errors, and does not update the payments" do
       expect(payment_confirmation.ingest).to be_falsey
-      expect(payment_confirmation.errors).to eq(["The claim at line 2 has invalid data"])
+      expect(payment_confirmation.errors).to eq(["The claim at line 2 has invalid data - Gross value can't be blank and National insurance can't be blank"])
 
       expect(payroll_run.payments[0].reload.payroll_reference).to eq(nil)
       expect(payroll_run.payments[1].reload.payroll_reference).to eq(nil)