diff --git a/core/src/main/java/google/registry/tools/CreateOrUpdateRegistrarCommand.java b/core/src/main/java/google/registry/tools/CreateOrUpdateRegistrarCommand.java
index dc592a5bb..f5625ca82 100644
--- a/core/src/main/java/google/registry/tools/CreateOrUpdateRegistrarCommand.java
+++ b/core/src/main/java/google/registry/tools/CreateOrUpdateRegistrarCommand.java
@@ -173,7 +173,8 @@ abstract class CreateOrUpdateRegistrarCommand extends MutatingCommand {
           "Registrar Billing Account key-value pairs (formatted as key=value[,key=value...]), "
               + "where key is a currency unit (USD, JPY, etc) and value is the registrar's billing "
               + "account id for that currency. During update, only the pairs that need updating "
-              + "need to be provided.",
+              + "need to be provided, except when an empty string is provided, in which case the"
+              + "entire map is nullified.",
       converter = CurrencyUnitToStringMap.class,
       validateWith = CurrencyUnitToStringMap.class)
   private Map<CurrencyUnit, String> billingAccountMap;
@@ -368,7 +369,9 @@ abstract class CreateOrUpdateRegistrarCommand extends MutatingCommand {
       Optional.ofNullable(poNumber).ifPresent(builder::setPoNumber);
       if (billingAccountMap != null) {
         LinkedHashMap<CurrencyUnit, String> newBillingAccountMap = new LinkedHashMap<>();
-        if (oldRegistrar != null && oldRegistrar.getBillingAccountMap() != null) {
+        if (oldRegistrar != null
+            && oldRegistrar.getBillingAccountMap() != null
+            && !billingAccountMap.isEmpty()) {
           newBillingAccountMap.putAll(oldRegistrar.getBillingAccountMap());
         }
         newBillingAccountMap.putAll(billingAccountMap);
diff --git a/core/src/test/java/google/registry/tools/UpdateRegistrarCommandTest.java b/core/src/test/java/google/registry/tools/UpdateRegistrarCommandTest.java
index b149cb6db..f30bb0f5d 100644
--- a/core/src/test/java/google/registry/tools/UpdateRegistrarCommandTest.java
+++ b/core/src/test/java/google/registry/tools/UpdateRegistrarCommandTest.java
@@ -25,6 +25,7 @@ import static google.registry.testing.DatabaseHelper.newRegistry;
 import static google.registry.testing.DatabaseHelper.persistResource;
 import static google.registry.util.DateTimeUtils.START_OF_TIME;
 import static org.joda.money.CurrencyUnit.JPY;
+import static org.joda.money.CurrencyUnit.USD;
 import static org.joda.time.DateTimeZone.UTC;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 
@@ -42,7 +43,6 @@ import google.registry.testing.AppEngineExtension;
 import google.registry.util.CidrAddressBlock;
 import java.math.BigDecimal;
 import java.util.Optional;
-import org.joda.money.CurrencyUnit;
 import org.joda.money.Money;
 import org.joda.time.DateTime;
 import org.junit.jupiter.api.BeforeEach;
@@ -368,7 +368,18 @@ class UpdateRegistrarCommandTest extends CommandTestCase<UpdateRegistrarCommand>
     assertThat(loadRegistrar("NewRegistrar").getBillingAccountMap()).isEmpty();
     runCommand("--billing_account_map=USD=abc123,JPY=789xyz", "--force", "NewRegistrar");
     assertThat(loadRegistrar("NewRegistrar").getBillingAccountMap())
-        .containsExactly(CurrencyUnit.USD, "abc123", CurrencyUnit.JPY, "789xyz");
+        .containsExactly(USD, "abc123", JPY, "789xyz");
+  }
+
+  @Test
+  void testSuccess_billingAccountMap_nullify() throws Exception {
+    persistResource(
+        loadRegistrar("NewRegistrar")
+            .asBuilder()
+            .setBillingAccountMap(ImmutableMap.of(USD, "abc123", JPY, "789xyz"))
+            .build());
+    runCommand("--billing_account_map=\"\"", "--force", "NewRegistrar");
+    assertThat(loadRegistrar("NewRegistrar").getBillingAccountMap()).isEmpty();
   }
 
   @Test
@@ -415,8 +426,7 @@ class UpdateRegistrarCommandTest extends CommandTestCase<UpdateRegistrarCommand>
         loadRegistrar("NewRegistrar").asBuilder().setBillingAccountMap(ImmutableMap.of()).build());
     assertThat(loadRegistrar("NewRegistrar").getBillingAccountMap()).isEmpty();
     runCommand("--billing_account_map=JPY=789xyz", "--allowed_tlds=foo", "--force", "NewRegistrar");
-    assertThat(loadRegistrar("NewRegistrar").getBillingAccountMap())
-        .containsExactly(CurrencyUnit.JPY, "789xyz");
+    assertThat(loadRegistrar("NewRegistrar").getBillingAccountMap()).containsExactly(JPY, "789xyz");
   }
 
   @Test
@@ -425,12 +435,11 @@ class UpdateRegistrarCommandTest extends CommandTestCase<UpdateRegistrarCommand>
     persistResource(
         loadRegistrar("NewRegistrar")
             .asBuilder()
-            .setBillingAccountMap(
-                ImmutableMap.of(CurrencyUnit.USD, "abc123", CurrencyUnit.JPY, "789xyz"))
+            .setBillingAccountMap(ImmutableMap.of(USD, "abc123", JPY, "789xyz"))
             .build());
     runCommand("--billing_account_map=JPY=123xyz", "--allowed_tlds=foo", "--force", "NewRegistrar");
     assertThat(loadRegistrar("NewRegistrar").getBillingAccountMap())
-        .containsExactly(CurrencyUnit.JPY, "123xyz", CurrencyUnit.USD, "abc123");
+        .containsExactly(JPY, "123xyz", USD, "abc123");
   }
 
   @Test