diff --git a/src/common/Common.h b/src/common/Common.h
index 564d6650..ce25b64f 100644
--- a/src/common/Common.h
+++ b/src/common/Common.h
@@ -27,6 +27,8 @@ namespace Sapphire::Common
   const uint8_t CLASSJOB_TOTAL = 38;
   const uint8_t CLASSJOB_SLOTS = 28;
 
+  const uint8_t TOWN_COUNT = 6;
+
   /*!
    * @brief The maximum length (in ms) of a combo before it is canceled/voided.
    *
diff --git a/src/common/Network/PacketDef/Ipcs.h b/src/common/Network/PacketDef/Ipcs.h
index bc4d592c..116742c6 100644
--- a/src/common/Network/PacketDef/Ipcs.h
+++ b/src/common/Network/PacketDef/Ipcs.h
@@ -110,6 +110,8 @@ namespace Sapphire::Network::Packets
     ReqMoogleMailLetter = 0x0139, // updated 5.0
     MailLetterNotification = 0x013A, // updated 5.0
 
+    MarketTaxRates = 0x0076, // added 5.1
+
     MarketBoardItemListingCount = 0x013B, // updated 5.0
     MarketBoardItemListing = 0x036A, // updated 5.1
     MarketBoardItemListingHistory = 0x0194, // updated 5.1
diff --git a/src/common/Network/PacketDef/Zone/ServerZoneDef.h b/src/common/Network/PacketDef/Zone/ServerZoneDef.h
index 3b4de057..9dc959b9 100644
--- a/src/common/Network/PacketDef/Zone/ServerZoneDef.h
+++ b/src/common/Network/PacketDef/Zone/ServerZoneDef.h
@@ -283,6 +283,15 @@ namespace Sapphire::Network::Packets::Server
     char unk2[0x4]; // This has probs something to do with the support desk (inquiry id?)
   };
 
+  struct FFFXIVIpcMarketTaxRates : FFXIVIpcBasePacket< MarketTaxRates >
+  {
+    uint32_t unknown1;
+    uint16_t padding1;
+    uint16_t unknown2;
+    uint32_t taxRate[Common::TOWN_COUNT]; // In the order of Common::Town
+    uint64_t unknown3;
+  };
+
   struct FFFXIVIpcMarketBoardItemListingCount : FFXIVIpcBasePacket< MarketBoardItemListingCount >
   {
     uint32_t itemCatalogId;