diff --git a/l10n_us_hr_payroll/data/state/wi_wisconsin.xml b/l10n_us_hr_payroll/data/state/wi_wisconsin.xml
index baff6b3a..b62dc3f4 100644
--- a/l10n_us_hr_payroll/data/state/wi_wisconsin.xml
+++ b/l10n_us_hr_payroll/data/state/wi_wisconsin.xml
@@ -15,6 +15,7 @@
     </data>
 
     <!-- Rate -->
+    <!-- Rate based on this file https://dwd.wisconsin.gov/ui/employers/taxrates.htm -->
     <record id="rule_parameter_us_wi_suta_rate" model="hr.rule.parameter">
         <field name="name">US WI Wisconsin SUTA Rate</field>
         <field name="code">us_wi_suta_rate</field>
@@ -41,6 +42,7 @@
         </record>
     </data>
 
+    <!-- Table based on https://www.revenue.wi.gov/DOR%20Publications/pb166.pdf page 25. -->
     <record id="rule_parameter_us_wi_sit_tax_rate" model="hr.rule.parameter">
         <field name="name">US WI Wisconsin SIT Tax Rate</field>
         <field name="code">us_wi_sit_tax_rate</field>
@@ -49,8 +51,24 @@
     <data noupdate="1">
         <record id="rule_parameter_us_wi_sit_tax_rate_2020" model="hr.rule.parameter.value">
             <field name="parameter_value">{
-                'single':  ((5730, 0.0000, 0.0), (15200, 4.0000, 0.0), (16486, 4.4800, 378.80), (26227, 6.5408, 436.41), (62950, 7.0224, 1073.55), (240190, 6.2700, 3652.39), ('inf', 7.6500, 14765.34)),
-                'married': ((7870, 0.0000, 0.0), (18780, 4.0000, 0.0), (21400, 5.8400, 436.40), (28308, 7.0080, 589.41), (60750, 7.5240, 1073.52), (240190, 6.2700, 3514.46), ('inf', 7.6500, 14765.35)),
+                'single':  (
+                    (  5730, 0.0000,     0.00),
+                    ( 15200, 4.0000,     0.00),
+                    ( 16486, 4.4800,   378.80),
+                    ( 26227, 6.5408,   436.41),
+                    ( 62950, 7.0224,  1073.55),
+                    (240190, 6.2700,  3652.39),
+                    ( 'inf', 7.6500, 14765.34),
+                ),
+                'married': (
+                    (  7870, 0.0000,     0.00),
+                    ( 18780, 4.0000,     0.00),
+                    ( 21400, 5.8400,   436.40),
+                    ( 28308, 7.0080,   589.41),
+                    ( 60750, 7.5240,  1073.52),
+                    (240190, 6.2700,  3514.46),
+                    ( 'inf', 7.6500, 14765.35),
+                ),
             }</field>
             <field name="rule_parameter_id" ref="rule_parameter_us_wi_sit_tax_rate"/>
             <field name="date_from" eval="datetime(2020, 1, 1).date()"/>
diff --git a/l10n_us_hr_payroll/tests/test_us_wi_wisconsin_payslip_2020.py b/l10n_us_hr_payroll/tests/test_us_wi_wisconsin_payslip_2020.py
index 8241e4c1..32bdfa30 100755
--- a/l10n_us_hr_payroll/tests/test_us_wi_wisconsin_payslip_2020.py
+++ b/l10n_us_hr_payroll/tests/test_us_wi_wisconsin_payslip_2020.py
@@ -27,11 +27,13 @@ class TestUsWIPayslip(TestUsPayslip):
         cats = self._getCategories(payslip)
 
         self._log('Computed period tax: ' + str(expected_withholding))
-        self.assertPayrollEqual(cats.get('EE_US_SIT', 0.0), -expected_withholding)
+        self.assertPayrollAlmostEqual(cats.get('EE_US_SIT', 0.0), -expected_withholding)
 
     def test_2020_taxes_example(self):
         self._test_er_suta('WI', self.WI_UNEMP, date(2020, 1, 1), wage_base=self.WI_UNEMP_MAX_WAGE)
-        self._test_sit(300, 'single', 1, 0, False,'weekly', date(2020, 1, 1), 7.21)
+        self._test_sit(300, 'single', 1, 0, False, 'weekly', date(2020, 1, 1), 7.21)
         self._test_sit(700, 'married', 3, 0, False, 'bi-weekly', date(2020, 1, 1), 13.35)
-        self._test_sit(1300, 'single', 1, 10, True, 'bi-weekly', date(2020, 1, 1), 0.00)
-        self._test_sit(700, 'married', 3, 10, False, 'bi-weekly', date(2020, 1, 1), 23.35)
+        self._test_sit(7000, 'single', 1, 10, True, 'bi-weekly', date(2020, 1, 1), 0.00)
+        self._test_sit(10000, 'married', 3, 10, False, 'bi-weekly', date(2020, 1, 1), 633.65)
+        # ((48000 - 26227) * (7.0224 /100) + 1073.55 - 44) / 12
+        self._test_sit(4000, 'single', 2, 0, False, 'monthly', date(2020, 1, 1), 213.21)