diff --git a/website/moneybirdsynchronization/models.py b/website/moneybirdsynchronization/models.py
index 4c84d12d3..c4d9f0fff 100644
--- a/website/moneybirdsynchronization/models.py
+++ b/website/moneybirdsynchronization/models.py
@@ -10,7 +10,7 @@
 from django.utils.translation import gettext_lazy as _
 
 from events.models import EventRegistration
-from members.models import Member
+from members.models import Member, Membership
 from moneybirdsynchronization.moneybird import get_moneybird_api_service
 from payments.models import BankAccount, Payment
 from payments.payables import payables
@@ -64,6 +64,12 @@ def ledger_id_for_payable_model(obj) -> Optional[int]:
     return None
 
 
+def membership_to_mb_period(membership: Membership) -> str:
+    """Convert a membership to a Moneybird period."""
+    start_date = membership.since
+    return f"{start_date.strftime('%Y%m%d')}..{start_date.strftime('%Y%m%d')}"
+
+
 class MoneybirdProject(models.Model):
     name = models.CharField(
         _("Name"),
@@ -269,6 +275,13 @@ def to_moneybird(self):
 
         ledger_id = ledger_id_for_payable_model(self.payable_object)
 
+        period = None
+        tax_rate_id = None
+        if isinstance(self.payable_object, (Registration, Renewal)):
+            tax_rate_id = settings.MONEYBIRD_ZERO_TAX_RATE_ID
+            if self.payable_object.membership is not None:
+                period = membership_to_mb_period(self.payable_object.membership)
+
         source_url = settings.BASE_URL + reverse(
             f"admin:{self.payable_object._meta.app_label}_{self.payable_object._meta.model_name}_change",
             args=(self.object_id,),
@@ -306,6 +319,12 @@ def to_moneybird(self):
             data["external_sales_invoice"]["details_attributes"][0]["id"] = int(
                 self.moneybird_details_attribute_id
             )
+        if period is not None:
+            data["external_sales_invoice"]["details_attributes"][0]["period"] = period
+        if tax_rate_id is not None:
+            data["external_sales_invoice"]["details_attributes"][0][
+                "tax_rate_id"
+            ] = int(tax_rate_id)
 
         return data
 
diff --git a/website/thaliawebsite/settings.py b/website/thaliawebsite/settings.py
index ed9908f77..16c2f5e22 100644
--- a/website/thaliawebsite/settings.py
+++ b/website/thaliawebsite/settings.py
@@ -1115,3 +1115,9 @@ def from_env(
     if os.environ.get("MONEYBIRD_CARD_FINANCIAL_ACCOUNT_ID")
     else None
 )
+
+MONEYBIRD_ZERO_TAX_RATE_ID: Optional[int] = (
+    int(os.environ.get("MONEYBIRD_ZERO_TAX_RATE_ID"))
+    if os.environ.get("MONEYBIRD_ZERO_TAX_RATE_ID")
+    else None
+)