diff --git a/l10n_us_ms_hr_payroll/data/rules.xml b/l10n_us_ms_hr_payroll/data/rules.xml
index 8a4dccf2..3079c439 100755
--- a/l10n_us_ms_hr_payroll/data/rules.xml
+++ b/l10n_us_ms_hr_payroll/data/rules.xml
@@ -116,6 +116,7 @@ else:
     result = round(TAX / PP)
 
 result += additional
+result = -result
         </field>
         <field name="register_id" ref="contrib_register_msdor_withhold"/>
     </record>
diff --git a/l10n_us_ms_hr_payroll/tests/test_us_ms_payslip_2019.py b/l10n_us_ms_hr_payroll/tests/test_us_ms_payslip_2019.py
index e738f8b2..34dae56a 100755
--- a/l10n_us_ms_hr_payroll/tests/test_us_ms_payslip_2019.py
+++ b/l10n_us_ms_hr_payroll/tests/test_us_ms_payslip_2019.py
@@ -33,7 +33,7 @@ class TestUsMsPayslip(TestUsPayslip):
         self.assertPayrollEqual(TAX, 570.0)
 
         ms_withhold = round(TAX / 24)  # Semi-Monthly
-        self.assertPayrollEqual(cats['EE_US_MS_INC_WITHHOLD'], ms_withhold)
+        self.assertPayrollEqual(cats['EE_US_MS_INC_WITHHOLD'], -ms_withhold)
 
     def test_2019_taxes_one_exempt(self):
         salary = 1250.0
@@ -83,4 +83,4 @@ class TestUsMsPayslip(TestUsPayslip):
         self.assertPayrollEqual(TAX, 570.0)
 
         ms_withhold = round(TAX / 24)  # Semi-Monthly
-        self.assertPayrollEqual(cats['EE_US_MS_INC_WITHHOLD'], ms_withhold + additional)
+        self.assertPayrollEqual(cats['EE_US_MS_INC_WITHHOLD'], -ms_withhold + -additional)
diff --git a/l10n_us_mt_hr_payroll/data/rules.xml b/l10n_us_mt_hr_payroll/data/rules.xml
index 03607cef..a1292185 100755
--- a/l10n_us_mt_hr_payroll/data/rules.xml
+++ b/l10n_us_mt_hr_payroll/data/rules.xml
@@ -118,6 +118,7 @@ if year == 2019 or True:
                 break
 
 result += additional
+result = -result
         </field>
         <field name="register_id" ref="contrib_register_mtdor_withhold"/>
     </record>
diff --git a/l10n_us_mt_hr_payroll/tests/test_us_mt_payslip_2019.py b/l10n_us_mt_hr_payroll/tests/test_us_mt_payslip_2019.py
index 59f9a60f..c17b5364 100755
--- a/l10n_us_mt_hr_payroll/tests/test_us_mt_payslip_2019.py
+++ b/l10n_us_mt_hr_payroll/tests/test_us_mt_payslip_2019.py
@@ -29,7 +29,7 @@ class TestUsMtPayslip(TestUsPayslip):
         mt_withhold = round(0 + (0.018 * (mt_taxable_income - 0)))
         self.assertPayrollEqual(mt_taxable_income, 155.0)
         self.assertPayrollEqual(mt_withhold, 3.0)
-        self.assertPayrollEqual(cats['EE_US_MT_INC_WITHHOLD'], mt_withhold)
+        self.assertPayrollEqual(cats['EE_US_MT_INC_WITHHOLD'], -mt_withhold)
 
     def test_2019_taxes_two(self):
         # Payroll Period Bi-Weekly example
@@ -57,7 +57,7 @@ class TestUsMtPayslip(TestUsPayslip):
         mt_withhold = round(18 + (0.06 * (mt_taxable_income - 577)))
         self.assertPayrollEqual(mt_taxable_income, 2804.0)
         self.assertPayrollEqual(mt_withhold, 152.0)
-        self.assertPayrollEqual(cats['EE_US_MT_INC_WITHHOLD'], mt_withhold)
+        self.assertPayrollEqual(cats['EE_US_MT_INC_WITHHOLD'], -mt_withhold)
 
     def test_2019_taxes_three(self):
         # Payroll Period Weekly example
@@ -83,7 +83,7 @@ class TestUsMtPayslip(TestUsPayslip):
         mt_withhold = round(0 + (0.018 * (mt_taxable_income - 0)))
         self.assertPayrollEqual(mt_taxable_income, 98.0)
         self.assertPayrollEqual(mt_withhold, 2.0)
-        self.assertPayrollEqual(cats['EE_US_MT_INC_WITHHOLD'], mt_withhold)
+        self.assertPayrollEqual(cats['EE_US_MT_INC_WITHHOLD'], -mt_withhold)
 
     def test_2019_taxes_three_exempt(self):
         # Payroll Period Weekly example
@@ -126,4 +126,4 @@ class TestUsMtPayslip(TestUsPayslip):
         mt_withhold = round(0 + (0.018 * (mt_taxable_income - 0)))
         self.assertPayrollEqual(mt_taxable_income, 98.0)
         self.assertPayrollEqual(mt_withhold, 2.0)
-        self.assertPayrollEqual(cats['EE_US_MT_INC_WITHHOLD'], mt_withhold + mt_mw4_additional_withholding)
+        self.assertPayrollEqual(cats['EE_US_MT_INC_WITHHOLD'], -mt_withhold + -mt_mw4_additional_withholding)