diff --git a/Cargo.lock b/Cargo.lock
index c2346d72..2894b567 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -717,7 +717,7 @@ checksum = "955d28af4278de8121b7ebeb796b6a45735dc01436d898801014aced2773a3d6"
 
 [[package]]
 name = "sentry_protos"
-version = "0.21.0"
+version = "0.22.0"
 dependencies = [
  "prost",
  "prost-types",
diff --git a/proto/sentry_protos/billing/v1/services/billing_details/v1/billing_details.proto b/proto/sentry_protos/billing/v1/services/billing_details/v1/billing_details.proto
index 864bef55..cdeb1720 100644
--- a/proto/sentry_protos/billing/v1/services/billing_details/v1/billing_details.proto
+++ b/proto/sentry_protos/billing/v1/services/billing_details/v1/billing_details.proto
@@ -22,4 +22,6 @@ message BillingDetails {
   optional string company_name = 3;
   optional string billing_email = 4;
   sentry_protos.billing.v1.common.v1.Address billing_address = 5;
+  // The customer's tax registration number (e.g. VAT ID), if on file.
+  optional string tax_number = 6;
 }
diff --git a/proto/sentry_protos/billing/v1/services/contract/v1/endpoint_create_contract.proto b/proto/sentry_protos/billing/v1/services/contract/v1/endpoint_create_contract.proto
index 0bc0d05b..0125014c 100644
--- a/proto/sentry_protos/billing/v1/services/contract/v1/endpoint_create_contract.proto
+++ b/proto/sentry_protos/billing/v1/services/contract/v1/endpoint_create_contract.proto
@@ -16,6 +16,10 @@ message CreateContractRequest {
   // supported_month_intervals. If unset, defaults to the package's first
   // supported interval.
   uint32 month_interval = 6;
+  // The customer's tax registration number (e.g. VAT ID), used to determine
+  // tax treatment for this contract (for example, reverse charge for
+  // tax-registered businesses). Unset if none is on file.
+  optional string customer_tax_id = 7;
 }
 
 message CreateContractResponse {
diff --git a/proto/sentry_protos/billing/v1/services/contract/v1/endpoint_rollover_contract.proto b/proto/sentry_protos/billing/v1/services/contract/v1/endpoint_rollover_contract.proto
index fc4cdfd9..1e39c36f 100644
--- a/proto/sentry_protos/billing/v1/services/contract/v1/endpoint_rollover_contract.proto
+++ b/proto/sentry_protos/billing/v1/services/contract/v1/endpoint_rollover_contract.proto
@@ -18,6 +18,10 @@ message RolloverContractRequest {
   // The pending change to apply to the new contract, if any. Unset means no
   // pending change is being applied during this rollover.
   optional sentry_protos.billing.v1.common.v1.PendingChange pending_change = 5;
+  // The customer's tax registration number (e.g. VAT ID), used to determine
+  // tax treatment for this contract (for example, reverse charge for
+  // tax-registered businesses). Unset if none is on file.
+  optional string customer_tax_id = 6;
 }
 
 message RolloverContractResponse {
diff --git a/rust/src/sentry_protos.billing.v1.services.billing_details.v1.rs b/rust/src/sentry_protos.billing.v1.services.billing_details.v1.rs
index 3a05b50b..e21d6284 100644
--- a/rust/src/sentry_protos.billing.v1.services.billing_details.v1.rs
+++ b/rust/src/sentry_protos.billing.v1.services.billing_details.v1.rs
@@ -31,6 +31,9 @@ pub struct BillingDetails {
     pub billing_address: ::core::option::Option<
         super::super::super::common::v1::Address,
     >,
+    /// The customer's tax registration number (e.g. VAT ID), if on file.
+    #[prost(string, optional, tag = "6")]
+    pub tax_number: ::core::option::Option<::prost::alloc::string::String>,
 }
 #[derive(Clone, Copy, PartialEq, Eq, Hash, ::prost::Message)]
 pub struct GetBillingDetailsRequest {
diff --git a/rust/src/sentry_protos.billing.v1.services.contract.v1.rs b/rust/src/sentry_protos.billing.v1.services.contract.v1.rs
index e5812bb5..9d3961f5 100644
--- a/rust/src/sentry_protos.billing.v1.services.contract.v1.rs
+++ b/rust/src/sentry_protos.billing.v1.services.contract.v1.rs
@@ -493,6 +493,11 @@ pub struct CreateContractRequest {
     /// supported interval.
     #[prost(uint32, tag = "6")]
     pub month_interval: u32,
+    /// The customer's tax registration number (e.g. VAT ID), used to determine
+    /// tax treatment for this contract (for example, reverse charge for
+    /// tax-registered businesses). Unset if none is on file.
+    #[prost(string, optional, tag = "7")]
+    pub customer_tax_id: ::core::option::Option<::prost::alloc::string::String>,
 }
 #[derive(Clone, PartialEq, Eq, Hash, ::prost::Message)]
 pub struct CreateContractResponse {
@@ -673,6 +678,11 @@ pub struct RolloverContractRequest {
     pub pending_change: ::core::option::Option<
         super::super::super::common::v1::PendingChange,
     >,
+    /// The customer's tax registration number (e.g. VAT ID), used to determine
+    /// tax treatment for this contract (for example, reverse charge for
+    /// tax-registered businesses). Unset if none is on file.
+    #[prost(string, optional, tag = "6")]
+    pub customer_tax_id: ::core::option::Option<::prost::alloc::string::String>,
 }
 #[derive(Clone, Copy, PartialEq, Eq, Hash, ::prost::Message)]
 pub struct RolloverContractResponse {