diff --git a/backend/benefit/calculator/rules.py b/backend/benefit/calculator/rules.py
index 853f6db4ba..5446f84036 100644
--- a/backend/benefit/calculator/rules.py
+++ b/backend/benefit/calculator/rules.py
@@ -106,8 +106,13 @@ def get_item_in_effect(
                     training_compensation,
                 )
             )
-        assert ranges[0].start_date == self.calculation.start_date
-        assert ranges[-1].end_date == self.calculation.end_date
+
+        if (
+            ranges[-1].end_date != self.calculation.end_date
+            or ranges[0].start_date != self.calculation.start_date
+        ):
+            raise ValueError("Error in range of calculation.start_date / end_date")
+
         return ranges
 
     def get_amount(self, row_type: RowType, default=None):
diff --git a/frontend/benefit/handler/public/locales/en/common.json b/frontend/benefit/handler/public/locales/en/common.json
index cbabf87258..99a6ffa9ab 100644
--- a/frontend/benefit/handler/public/locales/en/common.json
+++ b/frontend/benefit/handler/public/locales/en/common.json
@@ -862,6 +862,10 @@
       "monthlyAmount": {
         "label": "Koulutuskorvaus",
         "placeholder": "Koulutuskorvaus € / kk"
+      },
+      "unknownField": {
+        "label": "Tunnistamaton kenttä",
+        "placeholder": ""
       }
     },
     "notifications": {
@@ -920,6 +924,11 @@
       "header": "Myönnettävä Helsinki-lisä",
       "header2": "Arvio koostuu seuraavista tiedoista:",
       "acceptedBenefit": "Myönnettävä Helsinki-lisä"
+    },
+    "errors": {
+      "trainingCompensation": {
+        "invalid": "Koulutuskorvausrivin syöttö on vielä kesken. Lisää rivi laskelmaan."
+      }
     }
   },
   "organizationTypes": {
diff --git a/frontend/benefit/handler/public/locales/fi/common.json b/frontend/benefit/handler/public/locales/fi/common.json
index a81a91f7ae..4009647d1e 100644
--- a/frontend/benefit/handler/public/locales/fi/common.json
+++ b/frontend/benefit/handler/public/locales/fi/common.json
@@ -862,6 +862,10 @@
       "monthlyAmount": {
         "label": "Koulutuskorvaus",
         "placeholder": "Koulutuskorvaus € / kk"
+      },
+      "unknownField": {
+        "label": "Tunnistamaton kenttä",
+        "placeholder": ""
       }
     },
     "notifications": {
@@ -920,6 +924,11 @@
       "header": "Myönnettävä Helsinki-lisä",
       "header2": "Arvio koostuu seuraavista tiedoista:",
       "acceptedBenefit": "Myönnettävä Helsinki-lisä"
+    },
+    "errors": {
+      "trainingCompensation": {
+        "invalid": "Koulutuskorvausrivin syöttö on vielä kesken. Lisää rivi laskelmaan."
+      }
     }
   },
   "organizationTypes": {
diff --git a/frontend/benefit/handler/public/locales/sv/common.json b/frontend/benefit/handler/public/locales/sv/common.json
index cbabf87258..99a6ffa9ab 100644
--- a/frontend/benefit/handler/public/locales/sv/common.json
+++ b/frontend/benefit/handler/public/locales/sv/common.json
@@ -862,6 +862,10 @@
       "monthlyAmount": {
         "label": "Koulutuskorvaus",
         "placeholder": "Koulutuskorvaus € / kk"
+      },
+      "unknownField": {
+        "label": "Tunnistamaton kenttä",
+        "placeholder": ""
       }
     },
     "notifications": {
@@ -920,6 +924,11 @@
       "header": "Myönnettävä Helsinki-lisä",
       "header2": "Arvio koostuu seuraavista tiedoista:",
       "acceptedBenefit": "Myönnettävä Helsinki-lisä"
+    },
+    "errors": {
+      "trainingCompensation": {
+        "invalid": "Koulutuskorvausrivin syöttö on vielä kesken. Lisää rivi laskelmaan."
+      }
     }
   },
   "organizationTypes": {
diff --git a/frontend/benefit/handler/src/components/applicationReview/salaryBenefitCalculatorView/SalaryBenefitCalculatorView.tsx b/frontend/benefit/handler/src/components/applicationReview/salaryBenefitCalculatorView/SalaryBenefitCalculatorView.tsx
index 3b19c3f16b..e661c18ddb 100644
--- a/frontend/benefit/handler/src/components/applicationReview/salaryBenefitCalculatorView/SalaryBenefitCalculatorView.tsx
+++ b/frontend/benefit/handler/src/components/applicationReview/salaryBenefitCalculatorView/SalaryBenefitCalculatorView.tsx
@@ -2,6 +2,7 @@ import ReviewSection from 'benefit/handler/components/reviewSection/ReviewSectio
 import { CALCULATION_TYPES } from 'benefit/handler/constants';
 import { useCalculatorData } from 'benefit/handler/hooks/useCalculatorData';
 import { SalaryBenefitCalculatorViewProps } from 'benefit/handler/types/application';
+import { PAY_SUBSIDY_GRANTED } from 'benefit-shared/constants';
 import { PaySubsidy } from 'benefit-shared/types/application';
 import {
   Button,
@@ -179,16 +180,23 @@ const SalaryBenefitCalculatorView: React.FC<
             />
           </$GridCell>
 
-          <$GridCell $colStart={1} $colSpan={11}>
-            <$CalculatorHeader>
-              {t(`${translationsBase}.subsidies`)}
-            </$CalculatorHeader>
-          </$GridCell>
-          {formik.values.paySubsidies && (
+          {formik.values.paySubsidies?.length > 0 && (
             <$GridCell $colStart={1} $colSpan={11}>
-              <h3 style={{ fontSize: theme.fontSize.heading.xs, margin: 0 }}>
-                {t(`${translationsBase}.paySubsidy`)}
-              </h3>
+              <$CalculatorHeader as="div">
+                <p style={{ marginBottom: '0.5em' }}>
+                  {t(`${translationsBase}.subsidies`)}
+                </p>
+                <$ViewField>
+                  <strong>
+                    {t(`${translationsBase}.paySubsidy`)}{' '}
+                    {data.paySubsidyGranted === PAY_SUBSIDY_GRANTED.GRANTED_AGED
+                      ? `(${t(
+                          'applications.sections.fields.paySubsidyGranted.grantedAged'
+                        )})`
+                      : null}
+                  </strong>
+                </$ViewField>
+              </$CalculatorHeader>
             </$GridCell>
           )}
           {formik.values.paySubsidies?.map(
@@ -607,6 +615,15 @@ const SalaryBenefitCalculatorView: React.FC<
         $colSpan={11}
         style={{ marginTop: 'var(--spacing-xs)' }}
       >
+        <$ViewField
+          css={`
+            color: ${theme.colors.brick};
+          `}
+        >
+          {isDisabledAddTrainingCompensationButton === false &&
+            t('common:calculators.errors.trainingCompensation.invalid')}
+        </$ViewField>
+
         <Button
           onClick={handleSubmit}
           theme="coat"
@@ -634,11 +651,14 @@ const SalaryBenefitCalculatorView: React.FC<
           </$Notification>
         </$GridCell>
       )}
-      <SalaryCalculatorResults
-        data={data}
-        isManualCalculator={isManualCalculator}
-        isRecalculationRequired={isRecalculationRequired}
-      />
+
+      {!calculationsErrors && (
+        <SalaryCalculatorResults
+          data={data}
+          isManualCalculator={isManualCalculator}
+          isRecalculationRequired={isRecalculationRequired}
+        />
+      )}
     </ReviewSection>
   );
 };
diff --git a/frontend/benefit/handler/src/components/applicationReview/salaryBenefitCalculatorView/SalaryCalculatorResults/SalaryCalculatorResults.tsx b/frontend/benefit/handler/src/components/applicationReview/salaryBenefitCalculatorView/SalaryCalculatorResults/SalaryCalculatorResults.tsx
index 871fcba1c7..4ff33120d7 100644
--- a/frontend/benefit/handler/src/components/applicationReview/salaryBenefitCalculatorView/SalaryCalculatorResults/SalaryCalculatorResults.tsx
+++ b/frontend/benefit/handler/src/components/applicationReview/salaryBenefitCalculatorView/SalaryCalculatorResults/SalaryCalculatorResults.tsx
@@ -33,6 +33,11 @@ const SalaryCalculatorResults: React.FC<ApplicationReviewViewProps> = ({
   if (isRecalculationRequired) {
     return null;
   }
+
+  if (rowsWithoutTotal.length === 0) {
+    return null;
+  }
+
   return (
     <$GridCell
       $colSpan={11}
diff --git a/frontend/benefit/handler/src/components/applicationReview/salaryBenefitCalculatorView/useSalaryBenefitCalculatorData.ts b/frontend/benefit/handler/src/components/applicationReview/salaryBenefitCalculatorView/useSalaryBenefitCalculatorData.ts
index 54c9cb1f52..b1107004e8 100644
--- a/frontend/benefit/handler/src/components/applicationReview/salaryBenefitCalculatorView/useSalaryBenefitCalculatorData.ts
+++ b/frontend/benefit/handler/src/components/applicationReview/salaryBenefitCalculatorView/useSalaryBenefitCalculatorData.ts
@@ -11,6 +11,7 @@ import {
   TrainingCompensation,
 } from 'benefit-shared/types/application';
 import { FormikProps, useFormik } from 'formik';
+import clone from 'lodash/clone';
 import fromPairs from 'lodash/fromPairs';
 import { useTranslation } from 'next-i18next';
 import React, { Dispatch, SetStateAction, useEffect, useState } from 'react';
@@ -47,6 +48,13 @@ type ExtendedComponentProps = {
   isDisabledAddTrainingCompensationButton: boolean;
 };
 
+const initialTrainingCompensationValues = {
+  id: '',
+  monthlyAmount: '',
+  startDate: '',
+  endDate: '',
+};
+
 const useSalaryBenefitCalculatorData = (
   application: Application
 ): ExtendedComponentProps => {
@@ -60,12 +68,7 @@ const useSalaryBenefitCalculatorData = (
     useHandlerReviewActions(application);
 
   const [newTrainingCompensation, setNewTrainingCompensation] =
-    useState<TrainingCompensation>({
-      id: '',
-      monthlyAmount: '',
-      startDate: '',
-      endDate: '',
-    });
+    useState<TrainingCompensation>(clone(initialTrainingCompensationValues));
 
   const [
     isDisabledAddTrainingCompensationButton,
@@ -136,6 +139,7 @@ const useSalaryBenefitCalculatorData = (
         id: uuidv4(),
       },
     ]);
+    setNewTrainingCompensation(clone(initialTrainingCompensationValues));
   };
 
   const removeTrainingCompensation = (id: string): void => {
diff --git a/frontend/benefit/handler/src/hooks/useHandlerReviewActions.ts b/frontend/benefit/handler/src/hooks/useHandlerReviewActions.ts
index ba1e492842..1f0afb6d32 100644
--- a/frontend/benefit/handler/src/hooks/useHandlerReviewActions.ts
+++ b/frontend/benefit/handler/src/hooks/useHandlerReviewActions.ts
@@ -9,6 +9,7 @@ import { ErrorData } from 'benefit-shared/types/common';
 import camelcaseKeys from 'camelcase-keys';
 import isEmpty from 'lodash/isEmpty';
 import { useRouter } from 'next/router';
+import { useTranslation } from 'next-i18next';
 import React, { useEffect, useState } from 'react';
 import { convertToBackendDateFormat } from 'shared/utils/date.utils';
 import { stringToFloatValue } from 'shared/utils/string.utils';
@@ -40,6 +41,8 @@ const useHandlerReviewActions = (
 
   const { updateStatus } = useApplicationActions(application);
 
+  const { t } = useTranslation();
+
   // ACCEPTED, REJECTED
   const onDone = React.useCallback((): void => {
     if (handledApplication?.status) {
@@ -161,13 +164,25 @@ const useHandlerReviewActions = (
 
   useEffect(() => {
     if (updateApplicationQuery.error) {
-      setCalculationErrors(
-        camelcaseKeys(updateApplicationQuery.error?.response?.data ?? {})
-      );
+      // Can parse error codes from data on 400s, set generic error on 500
+      if (
+        updateApplicationQuery.error.response?.status >= 400 &&
+        updateApplicationQuery.error.response?.status < 500
+      ) {
+        setCalculationErrors(
+          camelcaseKeys(updateApplicationQuery.error.response?.data ?? {})
+        );
+      } else {
+        setCalculationErrors({
+          calculation: {
+            unknownField: t('common:calculators.notifications.error.message'),
+          },
+        } as ErrorData);
+      }
     } else {
       setCalculationErrors(null);
     }
-  }, [updateApplicationQuery.error, setCalculationErrors]);
+  }, [updateApplicationQuery.error, setCalculationErrors, t]);
 
   const onCalculateEmployment = (calculator: CalculationFormProps): void => {
     void updateApplicationQuery.mutate(getDataEmployment(calculator));