diff --git a/frontend/public/locales/en/common.json b/frontend/public/locales/en/common.json
index 795e38948ada4b7c180db25a267d72d19dc00310..de5d2ad5759ba3e606973caa474cadfd305725b6 100644
--- a/frontend/public/locales/en/common.json
+++ b/frontend/public/locales/en/common.json
@@ -86,7 +86,9 @@
     "invalidMobilePhoneNumber": "Invalid phone number",
     "invalidEmail": "Invalid e-mail address",
     "passportNumberRequired": "Passport number required",
-    "mobilePhoneRequired": "Mobile phone is required"
+    "mobilePhoneRequired": "Mobile phone is required",
+    "startDateMustBeSet": "Start date must be set",
+    "startDateMustBeBeforeEndDate": "Start date has to be before end date"
   },
   "button": {
     "back": "Back",
diff --git a/frontend/public/locales/nb/common.json b/frontend/public/locales/nb/common.json
index 2a1a32b4b867ecc9356deac7db1376812f4fed99..2a04b0f408bb64de2a0059af12c6d9741b91d0da 100644
--- a/frontend/public/locales/nb/common.json
+++ b/frontend/public/locales/nb/common.json
@@ -86,7 +86,9 @@
     "invalidMobilePhoneNumber": "Ugyldig telefonnummer",
     "invalidEmail": "Ugyldig e-postadresse",
     "passportNumberRequired": "Passnummer er obligatorisk",
-    "mobilePhoneRequired": "Mobilnummer er obligatorisk"
+    "mobilePhoneRequired": "Mobilnummer er obligatorisk",
+    "startDateMustBeSet": "Startdato må være satt",
+    "startDateMustBeBeforeEndDate": "Startdato må være før sluttdato"
   },
   "button": {
     "back": "Tilbake",
diff --git a/frontend/public/locales/nn/common.json b/frontend/public/locales/nn/common.json
index 30dde00a616e4214513de8a3ce1d62e3049e09dd..33649f6024dfb7d3b4e797b8dc9398ac97ab320f 100644
--- a/frontend/public/locales/nn/common.json
+++ b/frontend/public/locales/nn/common.json
@@ -87,7 +87,9 @@
     "invalidMobilePhoneNumber": "Ugyldig telefonnummer",
     "invalidEmail": "Ugyldig e-postadresse",
     "passportNumberRequired": "Passnummer er obligatorisk",
-    "mobilePhoneRequired": "Mobilnummer er obligatorisk"
+    "mobilePhoneRequired": "Mobilnummer er obligatorisk",
+    "startDateMustBeSet": "Startdato må vere satt",
+    "startDateMustBeBeforeEndDate": "Startdato må vere før sluttdato"
   },
   "button": {
     "back": "Tilbake",
diff --git a/frontend/src/routes/sponsor/register/stepPersonForm.tsx b/frontend/src/routes/sponsor/register/stepPersonForm.tsx
index bbfd2431a8f3b5a200e865dd451bd7f203a08fa4..6c57988e11e2eb2b71be602fd7be4a1df4a78aa8 100644
--- a/frontend/src/routes/sponsor/register/stepPersonForm.tsx
+++ b/frontend/src/routes/sponsor/register/stepPersonForm.tsx
@@ -62,6 +62,7 @@ const StepPersonForm = forwardRef(
       formState: { errors },
       reset,
       setValue,
+      getValues,
     } = useForm<RegisterFormData>()
     const onSubmit = handleSubmit(submit)
 
@@ -93,6 +94,19 @@ const StepPersonForm = forwardRef(
 
     useImperativeHandle(ref, () => ({ doSubmit }))
 
+    const validateStartDateBeforeEndDate = (startDate: Date | undefined) => {
+      if (!startDate) {
+        return t('validation.startDateMustBeSet')
+      }
+
+      const roleEnd = getValues('role_end')
+      if (roleEnd && startDate > roleEnd) {
+        // The role end date is set, but is is before the start date
+        return t('validation.startDateMustBeBeforeEndDate')
+      }
+      return true
+    }
+
     return (
       <>
         <Typography
@@ -185,9 +199,11 @@ const StepPersonForm = forwardRef(
                 ))}
               </TextField>
 
+              {/* There are no particular constraints on the date pickers. It should be allowed to add a role with a start date that is in the past for instance */}
               <Controller
                 name="role_start"
                 control={control}
+                rules={{ validate: validateStartDateBeforeEndDate }}
                 render={({ field }) => (
                   <DatePicker
                     mask="____-__-__"
@@ -201,7 +217,11 @@ const StepPersonForm = forwardRef(
                   />
                 )}
               />
-
+              {!!errors.role_start && (
+                <Box sx={{ typography: 'caption', color: 'red' }}>
+                  {errors.role_start.message}
+                </Box>
+              )}
               <Controller
                 name="role_end"
                 control={control}