diff --git a/l10n_us_hr_payroll/data/state/sc_south_carolina.xml b/l10n_us_hr_payroll/data/state/sc_south_carolina.xml
index b2a46192..04a10d70 100644
--- a/l10n_us_hr_payroll/data/state/sc_south_carolina.xml
+++ b/l10n_us_hr_payroll/data/state/sc_south_carolina.xml
@@ -7,11 +7,7 @@
         <field name="country_id" ref="base.us"/>
     </record>
     <data noupdate="1">
-        <record id="rule_parameter_us_sc_suta_wage_base_2019" model="hr.rule.parameter.value">
-            <field name="parameter_value">14000.0</field>
-            <field name="rule_parameter_id" ref="rule_parameter_us_sc_suta_wage_base"/>
-            <field name="date_from" eval="datetime(2019, 1, 1).date()"/>
-        </record>
+        <!-- Unchanged in 2021 https://dew.sc.gov/employers/unemployment-insurance-tax-programs/tax-rate -->
         <record id="rule_parameter_us_sc_suta_wage_base_2020" model="hr.rule.parameter.value">
             <field name="parameter_value">14000.0</field>
             <field name="rule_parameter_id" ref="rule_parameter_us_sc_suta_wage_base"/>
@@ -26,12 +22,8 @@
         <field name="country_id" ref="base.us"/>
     </record>
     <data noupdate="1">
-        <record id="rule_parameter_us_sc_suta_rate_2019" model="hr.rule.parameter.value">
-            <field name="parameter_value">1.09</field>
-            <field name="rule_parameter_id" ref="rule_parameter_us_sc_suta_rate"/>
-            <field name="date_from" eval="datetime(2019, 1, 1).date()"/>
-        </record>
         <!-- Tax rate from https://taxnews.ey.com/news/2019-2183-south-carolina-2020-sui-tax-rates-to-decrease-due-to-elimination-of-the-variable-solvency-surcharge-wage-base-unchanged -->
+        <!-- Unchanged in 2021 https://dew.sc.gov/employers/unemployment-insurance-tax-programs/tax-rate -->
         <record id="rule_parameter_us_sc_suta_rate_2020" model="hr.rule.parameter.value">
             <field name="parameter_value">0.55</field>
             <field name="rule_parameter_id" ref="rule_parameter_us_sc_suta_rate"/>
@@ -70,6 +62,19 @@
             <field name="rule_parameter_id" ref="rule_parameter_us_sc_sit_tax_rate"/>
             <field name="date_from" eval="datetime(2020, 1, 1).date()"/>
         </record>
+        <!-- Substraction Method table from https://dor.sc.gov/forms-site/Forms/WH1603F_2021.pdf -->
+        <record id="rule_parameter_us_sc_sit_tax_rate_2021" model="hr.rule.parameter.value">
+            <field name="parameter_value">[
+                ( 2800, 0.5,    0.0),
+                ( 5610, 3.0,  70.00),
+                ( 8410, 4.0, 126.10),
+                (11220, 5.0, 210.20),
+                (14030, 6.0, 322.40),
+                ('inf', 7.0, 462.70),
+            ]</field>
+            <field name="rule_parameter_id" ref="rule_parameter_us_sc_sit_tax_rate"/>
+            <field name="date_from" eval="datetime(2021, 1, 1).date()"/>
+        </record>
     </data>
 
     <record id="rule_parameter_us_sc_sit_personal_exemption_rate" model="hr.rule.parameter">
@@ -78,16 +83,17 @@
         <field name="country_id" ref="base.us"/>
     </record>
     <data noupdate="1">
-        <record id="rule_parameter_us_sc_sit_personal_exemption_rate_2019" model="hr.rule.parameter.value">
-            <field name="parameter_value">2510</field>
-            <field name="rule_parameter_id" ref="rule_parameter_us_sc_sit_personal_exemption_rate"/>
-            <field name="date_from" eval="datetime(2019, 1, 1).date()"/>
-        </record>
         <record id="rule_parameter_us_sc_sit_personal_exemption_rate_2020" model="hr.rule.parameter.value">
             <field name="parameter_value">2590</field>
             <field name="rule_parameter_id" ref="rule_parameter_us_sc_sit_personal_exemption_rate"/>
             <field name="date_from" eval="datetime(2020, 1, 1).date()"/>
         </record>
+        <!-- https://dor.sc.gov/forms-site/Forms/WH1603F_2021.pdf -->
+        <record id="rule_parameter_us_sc_sit_personal_exemption_rate_2021" model="hr.rule.parameter.value">
+            <field name="parameter_value">2670</field>
+            <field name="rule_parameter_id" ref="rule_parameter_us_sc_sit_personal_exemption_rate"/>
+            <field name="date_from" eval="datetime(2021, 1, 1).date()"/>
+        </record>
     </data>
     
     <record id="rule_parameter_us_sc_sit_standard_deduction_rate" model="hr.rule.parameter">
@@ -96,16 +102,16 @@
         <field name="country_id" ref="base.us"/>
     </record>
     <data noupdate="1">
-        <record id="rule_parameter_us_sc_sit_standard_deduction_rate_2019" model="hr.rule.parameter.value">
-            <field name="parameter_value">3470.0</field>
-            <field name="rule_parameter_id" ref="rule_parameter_us_sc_sit_standard_deduction_rate"/>
-            <field name="date_from" eval="datetime(2019, 1, 1).date()"/>
-        </record>
         <record id="rule_parameter_us_sc_sit_standard_deduction_rate_2020" model="hr.rule.parameter.value">
             <field name="parameter_value">3820.0</field>
             <field name="rule_parameter_id" ref="rule_parameter_us_sc_sit_standard_deduction_rate"/>
             <field name="date_from" eval="datetime(2020, 1, 1).date()"/>
         </record>
+        <record id="rule_parameter_us_sc_sit_standard_deduction_rate_2021" model="hr.rule.parameter.value">
+            <field name="parameter_value">4200</field>
+            <field name="rule_parameter_id" ref="rule_parameter_us_sc_sit_standard_deduction_rate"/>
+            <field name="date_from" eval="datetime(2021, 1, 1).date()"/>
+        </record>
     </data>
 
     <!-- Partners and Contribution Registers -->
diff --git a/l10n_us_hr_payroll/tests/test_us_sc_south_carolina_payslip_2019.py b/l10n_us_hr_payroll/tests/test_us_sc_south_carolina_payslip_2019.py
deleted file mode 100644
index 793f84c4..00000000
--- a/l10n_us_hr_payroll/tests/test_us_sc_south_carolina_payslip_2019.py
+++ /dev/null
@@ -1,97 +0,0 @@
-# Part of Hibou Suite Professional. See LICENSE_PROFESSIONAL file for full copyright and licensing details.
-
-from .common import TestUsPayslip, process_payslip
-
-
-class TestUsSCPayslip(TestUsPayslip):
-
-    #    Taxes and Rates
-    SC_UNEMP_MAX_WAGE = 14000.0
-    US_SC_UNEMP = -1.09 / 100
-    US_SC_exemption_amount = 2510.00
-
-    def test_2019_taxes_weekly(self):
-        # We will hand calculate the amount to test for state withholding.
-        schedule_pay = 'weekly'
-        salary = 50000.00  # Employee is paid 50000 per week to be in top tax bracket
-        allowances = 2
-        # Calculate annual wages
-        annual = 50000 * 52.0
-        # From our annual we deduct personal exemption amounts.
-        # We deduct 2510.00 per exemption. Since we have two exemptions:
-        personal_exemption = self.US_SC_exemption_amount * allowances  # 5020.0
-        # From annual, we will also deduct a standard_deduction of  3470.00 or .1 of salary, which ever
-        # is small -> if 1 or more exemptions, else 0
-        standard_deduction = 3470.00
-        taxable_income = annual - personal_exemption - standard_deduction  # 2591510.0
-        # We then calculate the amounts off the SC tax pdf tables.
-        # 2591478.0 is in the highest bracket
-        test_amt = (taxable_income * (7.0 / 100.0)) - 467.95
-        test_amt = 180935.51
-        # Make it per period then negative
-        test_amt = (test_amt / 52.0)  # Divided by 52 since it is weekly.
-        # test_amt = 3479.52
-        test_amt = -test_amt
-
-        employee = self._createEmployee()
-        contract = self._createContract(employee,
-                                        wage=salary,
-                                        state_id=self.get_us_state('SC'),
-                                        state_income_tax_exempt=False,
-                                        sc_w4_sit_allowances=allowances,
-                                        schedule_pay=schedule_pay)
-
-        self._log('2019 South Carolina tax first payslip:')
-        payslip = self._createPayslip(employee, '2019-01-01', '2019-01-31')
-        payslip.compute_sheet()
-        cats = self._getCategories(payslip)
-
-        self.assertPayrollAlmostEqual(cats['ER_US_SUTA'], self.SC_UNEMP_MAX_WAGE * self.US_SC_UNEMP)
-        self.assertPayrollAlmostEqual(cats['EE_US_SIT'], test_amt)
-
-        process_payslip(payslip)
-
-        remaining_SC_UNEMP_wages = self.SC_UNEMP_MAX_WAGE - annual if (annual < self.SC_UNEMP_MAX_WAGE) \
-            else 0.00
-
-        self._log('2019 South Carolina tax second payslip:')
-
-        payslip = self._createPayslip(employee, '2019-02-01', '2019-02-28')
-        payslip.compute_sheet()
-        cats = self._getCategories(payslip)
-
-        self.assertEqual(0.0, remaining_SC_UNEMP_wages)
-        self.assertPayrollEqual(cats['ER_US_SUTA'], remaining_SC_UNEMP_wages * self.US_SC_UNEMP)
-
-    def test_2019_taxes_filing_status(self):
-        salary = 20000.00  # Wages per pay period
-        schedule_pay = 'monthly'
-        annual = salary * 12
-        allowances = 1
-        # Hand Calculations
-        personal_exemption = 2510.00
-        standard_deduction = min(3470.00, .1 * annual)  # 3470.0 but min is shown for the process
-        taxable = annual - personal_exemption - standard_deduction
-        # taxable = 234020
-        test_amt = ((taxable) * (7.0 / 100.0)) - 467.95  # 15991.850000000002
-        test_amt = test_amt / 12.0  # Put it into monthly -> 1332.654166666667
-        # Make it negative
-        test_amt = -test_amt
-
-        employee = self._createEmployee()
-        contract = self._createContract(employee,
-                                        wage=salary,
-                                        state_id=self.get_us_state('SC'),
-                                        state_income_tax_exempt=False,
-                                        sc_w4_sit_allowances=allowances,
-                                        schedule_pay=schedule_pay)
-
-        self._log('2019 South Carolina tax first payslip: ')
-        payslip = self._createPayslip(employee, '2019-01-01', '2019-01-31')
-        payslip.compute_sheet()
-        cats = self._getCategories(payslip)
-
-        self.assertPayrollEqual(cats['ER_US_SUTA'], self.SC_UNEMP_MAX_WAGE * self.US_SC_UNEMP)
-        self.assertPayrollAlmostEqual(cats['EE_US_SIT'], test_amt)
-
-        process_payslip(payslip)
diff --git a/l10n_us_hr_payroll/tests/test_us_sc_south_carolina_payslip_2020.py b/l10n_us_hr_payroll/tests/test_us_sc_south_carolina_payslip_2020.py
index 170c3bf5..086af309 100644
--- a/l10n_us_hr_payroll/tests/test_us_sc_south_carolina_payslip_2020.py
+++ b/l10n_us_hr_payroll/tests/test_us_sc_south_carolina_payslip_2020.py
@@ -6,11 +6,11 @@ from .common import TestUsPayslip
 
 class TestUsSCPayslip(TestUsPayslip):
     ###
-    #   2020 Taxes and Rates
+    #   2021 Taxes and Rates
     ###
     SC_UNEMP_MAX_WAGE = 14000.0
     SC_UNEMP = 0.55
-    # Calculation based on https://dor.sc.gov/forms-site/Forms/WH1603F_2020.pdf
+    # Calculation based on https://dor.sc.gov/forms-site/Forms/WH1603F_2021.pdf
 
     def _test_sit(self, wage, additional_withholding, exempt, allowances,  schedule_pay,  date_start, expected_withholding):
         employee = self._createEmployee()
@@ -28,9 +28,9 @@ class TestUsSCPayslip(TestUsPayslip):
         self._log('Computed period tax: ' + str(expected_withholding))
         self.assertPayrollAlmostEqual(cats.get('EE_US_SIT', 0.0), -expected_withholding)
 
-    def test_2020_taxes_example(self):
-        self._test_er_suta('SC', self.SC_UNEMP, date(2020, 1, 1), wage_base=self.SC_UNEMP_MAX_WAGE)
-        self._test_sit(750.0, 0.0, False, 3.0, 'weekly', date(2020, 1, 1), 28.73)
-        self._test_sit(800.0, 0.0, True, 0.0, 'weekly', date(2020, 1, 1), 0.00)
-        self._test_sit(9000.0, 0.0, False, 0.0, 'monthly', date(2020, 1, 1), 594.61)
-        self._test_sit(5000.0, 10.0, False, 2.0, 'semi-monthly', date(2020, 1, 1), 316.06)
+    def test_2021_taxes_example(self):
+        self._test_er_suta('SC', self.SC_UNEMP, date(2021, 1, 1), wage_base=self.SC_UNEMP_MAX_WAGE)
+        self._test_sit(750.0, 0.0, False, 3.0, 'weekly', date(2021, 1, 1), 28.73)
+        self._test_sit(800.0, 0.0, True, 0.0, 'weekly', date(2021, 1, 1), 0.00)
+        self._test_sit(9000.0, 0.0, False, 0.0, 'monthly', date(2021, 1, 1), 594.61)
+        self._test_sit(5000.0, 10.0, False, 2.0, 'semi-monthly', date(2021, 1, 1), 316.06)
diff --git a/l10n_us_hr_payroll/tests/test_us_sc_south_carolina_payslip_2021.py b/l10n_us_hr_payroll/tests/test_us_sc_south_carolina_payslip_2021.py
new file mode 100644
index 00000000..3fb11459
--- /dev/null
+++ b/l10n_us_hr_payroll/tests/test_us_sc_south_carolina_payslip_2021.py
@@ -0,0 +1,36 @@
+# Part of Hibou Suite Professional. See LICENSE_PROFESSIONAL file for full copyright and licensing details.
+
+from datetime import date, timedelta
+from .common import TestUsPayslip
+
+
+class TestUsSCPayslip(TestUsPayslip):
+    ###
+    #   2021 Taxes and Rates
+    ###
+    SC_UNEMP_MAX_WAGE = 14000.0
+    SC_UNEMP = 0.55
+    # Calculation based on https://dor.sc.gov/forms-site/Forms/WH1603F_2021.pdf
+
+    def _test_sit(self, wage, additional_withholding, exempt, allowances,  schedule_pay,  date_start, expected_withholding):
+        employee = self._createEmployee()
+        contract = self._createContract(employee,
+                                        wage=wage,
+                                        state_id=self.get_us_state('SC'),
+                                        state_income_tax_additional_withholding=additional_withholding,
+                                        state_income_tax_exempt=exempt,
+                                        sc_w4_sit_allowances=allowances,
+                                        schedule_pay=schedule_pay)
+        payslip = self._createPayslip(employee, date_start, date_start + timedelta(days=7))
+        payslip.compute_sheet()
+        cats = self._getCategories(payslip)
+
+        self._log('Computed period tax: ' + str(expected_withholding))
+        self.assertPayrollAlmostEqual(cats.get('EE_US_SIT', 0.0), -expected_withholding)
+
+    def test_2021_taxes_example(self):
+        self._test_er_suta('SC', self.SC_UNEMP, date(2021, 1, 1), wage_base=self.SC_UNEMP_MAX_WAGE)
+        self._test_sit(750.0, 0.0, False, 3.0, 'weekly', date(2021, 1, 1), 27.57)
+        self._test_sit(800.0, 0.0, True, 0.0, 'weekly', date(2021, 1, 1), 0.00)
+        self._test_sit(9000.0, 0.0, False, 0.0, 'monthly', date(2021, 1, 1), 591.44)
+        self._test_sit(5000.0, 10.0, False, 2.0, 'semi-monthly', date(2021, 1, 1), 312.90)