diff --git a/include/xrpl/ledger/helpers/SponsorHelpers.h b/include/xrpl/ledger/helpers/SponsorHelpers.h
index 17b287c5b2..3c4615b325 100644
--- a/include/xrpl/ledger/helpers/SponsorHelpers.h
+++ b/include/xrpl/ledger/helpers/SponsorHelpers.h
@@ -31,104 +31,38 @@ isReserveSponsored(STTx const& tx)
     return (tx.getFieldU32(sfSponsorFlags) & spfSponsorReserve) != 0u;
 }
 
-inline std::optional<AccountID>
-getTxReserveSponsorAccountID(STTx const& tx)
-{
-    if (tx.isFieldPresent(sfSponsor) && isReserveSponsored(tx))
-    {
-        return tx.getAccountID(sfSponsor);
-    }
-    return {};
-}
+std::optional<AccountID>
+getTxReserveSponsorAccountID(STTx const& tx);
 
-inline std::expected<SLE::pointer, TER>
-getTxReserveSponsor(ApplyViewContext ctx)
-{
-    auto const sponsorID = getTxReserveSponsorAccountID(ctx.tx);
-    if (sponsorID)
-    {
-        auto sle = ctx.view.peek(keylet::account(*sponsorID));
+std::expected<SLE::pointer, TER>
+getTxReserveSponsor(ApplyViewContext ctx);
 
-        // already checked in Transactor::checkSponsor
-        if (!sle)
-            return std::unexpected(tecINTERNAL);
-        return sle;
-    }
-    return SLE::pointer();
-}
+std::expected<SLE::const_pointer, TER>
+getTxReserveSponsor(ReadView const& view, STTx const& tx);
 
-inline std::expected<SLE::const_pointer, TER>
-getTxReserveSponsor(ReadView const& view, STTx const& tx)
-{
-    auto const sponsorID = getTxReserveSponsorAccountID(tx);
-    if (sponsorID)
-    {
-        auto sle = view.read(keylet::account(*sponsorID));
+std::optional<AccountID>
+getLedgerEntryReserveSponsorAccountID(SLE::const_ref sle, SF_ACCOUNT const& field = sfSponsor);
 
-        // already checked in Transactor::checkSponsor
-        if (!sle)
-            return std::unexpected(tecINTERNAL);
-        return sle;
-    }
-    return SLE::pointer();
-}
-
-inline std::optional<AccountID>
-getLedgerEntryReserveSponsorAccountID(SLE::const_ref sle, SF_ACCOUNT const& field = sfSponsor)
-{
-    if (sle->isFieldPresent(field))
-        return sle->getAccountID(field);
-    return {};
-}
-
-inline SLE::pointer
+SLE::pointer
 getLedgerEntryReserveSponsor(
     ApplyView& view,
     SLE::const_ref sle,
-    SF_ACCOUNT const& field = sfSponsor)
-{
-    auto const sponsorID = getLedgerEntryReserveSponsorAccountID(sle, field);
-    if (sponsorID)
-        return view.peek(keylet::account(*sponsorID));
-    return {};
-}
+    SF_ACCOUNT const& field = sfSponsor);
 
-inline SLE::const_pointer
+SLE::const_pointer
 getLedgerEntryReserveSponsor(
     ReadView const& view,
     SLE::const_ref sle,
-    SF_ACCOUNT const& field = sfSponsor)
-{
-    auto const sponsorID = getLedgerEntryReserveSponsorAccountID(sle, field);
-    if (sponsorID)
-        return view.read(keylet::account(*sponsorID));
-    return {};
-}
+    SF_ACCOUNT const& field = sfSponsor);
 
-inline void
+void
 addSponsorToLedgerEntry(
     SLE::ref sle,
     SLE::const_ref sponsorSle,
-    SF_ACCOUNT const& field = sfSponsor)
-{
-    XRPL_ASSERT(
-        (sle->getType() == ltRIPPLE_STATE && (field == sfHighSponsor || field == sfLowSponsor)) ||
-            (sle->getType() != ltRIPPLE_STATE && field == sfSponsor),
-        "addSponsorToLedgerEntry : Invalid field to the LedgerEntry");
-    if (sponsorSle)
-        sle->setAccountID(field, sponsorSle->getAccountID(sfAccount));
-}
+    SF_ACCOUNT const& field = sfSponsor);
 
-inline void
-removeSponsorFromLedgerEntry(SLE::ref sle, SF_ACCOUNT const& field = sfSponsor)
-{
-    XRPL_ASSERT(
-        (sle->getType() == ltRIPPLE_STATE && (field == sfHighSponsor || field == sfLowSponsor)) ||
-            (sle->getType() != ltRIPPLE_STATE && field == sfSponsor),
-        "removeSponsorFromLedgerEntry : Invalid field to the LedgerEntry");
-    if (sle->isFieldPresent(field))
-        sle->makeFieldAbsent(field);
-}
+void
+removeSponsorFromLedgerEntry(SLE::ref sle, SF_ACCOUNT const& field = sfSponsor);
 
 template <typename T>
 inline std::optional<AccountID>
diff --git a/src/libxrpl/ledger/helpers/SponsorHelpers.cpp b/src/libxrpl/ledger/helpers/SponsorHelpers.cpp
new file mode 100644
index 0000000000..cb7f0fedc2
--- /dev/null
+++ b/src/libxrpl/ledger/helpers/SponsorHelpers.cpp
@@ -0,0 +1,109 @@
+#include <xrpl/ledger/helpers/SponsorHelpers.h>
+
+#include <xrpl/beast/utility/instrumentation.h>
+#include <xrpl/ledger/ApplyView.h>
+#include <xrpl/ledger/ReadView.h>
+#include <xrpl/protocol/AccountID.h>
+#include <xrpl/protocol/Indexes.h>
+#include <xrpl/protocol/LedgerFormats.h>
+#include <xrpl/protocol/SField.h>
+#include <xrpl/protocol/STLedgerEntry.h>
+#include <xrpl/protocol/STTx.h>
+#include <xrpl/protocol/TER.h>
+
+#include <expected>
+#include <optional>
+
+namespace xrpl {
+
+std::optional<AccountID>
+getTxReserveSponsorAccountID(STTx const& tx)
+{
+    if (tx.isFieldPresent(sfSponsor) && isReserveSponsored(tx))
+    {
+        return tx.getAccountID(sfSponsor);
+    }
+    return {};
+}
+
+std::expected<SLE::pointer, TER>
+getTxReserveSponsor(ApplyViewContext ctx)
+{
+    auto const sponsorID = getTxReserveSponsorAccountID(ctx.tx);
+    if (sponsorID)
+    {
+        auto sle = ctx.view.peek(keylet::account(*sponsorID));
+
+        // already checked in Transactor::checkSponsor
+        if (!sle)
+            return std::unexpected(tecINTERNAL);
+        return sle;
+    }
+    return SLE::pointer();
+}
+
+std::expected<SLE::const_pointer, TER>
+getTxReserveSponsor(ReadView const& view, STTx const& tx)
+{
+    auto const sponsorID = getTxReserveSponsorAccountID(tx);
+    if (sponsorID)
+    {
+        auto sle = view.read(keylet::account(*sponsorID));
+
+        // already checked in Transactor::checkSponsor
+        if (!sle)
+            return std::unexpected(tecINTERNAL);
+        return sle;
+    }
+    return SLE::pointer();
+}
+
+std::optional<AccountID>
+getLedgerEntryReserveSponsorAccountID(SLE::const_ref sle, SF_ACCOUNT const& field)
+{
+    if (sle->isFieldPresent(field))
+        return sle->getAccountID(field);
+    return {};
+}
+
+SLE::pointer
+getLedgerEntryReserveSponsor(ApplyView& view, SLE::const_ref sle, SF_ACCOUNT const& field)
+{
+    auto const sponsorID = getLedgerEntryReserveSponsorAccountID(sle, field);
+    if (sponsorID)
+        return view.peek(keylet::account(*sponsorID));
+    return {};
+}
+
+SLE::const_pointer
+getLedgerEntryReserveSponsor(ReadView const& view, SLE::const_ref sle, SF_ACCOUNT const& field)
+{
+    auto const sponsorID = getLedgerEntryReserveSponsorAccountID(sle, field);
+    if (sponsorID)
+        return view.read(keylet::account(*sponsorID));
+    return {};
+}
+
+void
+addSponsorToLedgerEntry(SLE::ref sle, SLE::const_ref sponsorSle, SF_ACCOUNT const& field)
+{
+    XRPL_ASSERT(
+        (sle->getType() == ltRIPPLE_STATE && (field == sfHighSponsor || field == sfLowSponsor)) ||
+            (sle->getType() != ltRIPPLE_STATE && field == sfSponsor),
+        "addSponsorToLedgerEntry : Invalid field to the LedgerEntry");
+    if (sponsorSle)
+        sle->setAccountID(field, sponsorSle->getAccountID(sfAccount));
+}
+
+void
+removeSponsorFromLedgerEntry(SLE::ref sle, SF_ACCOUNT const& field)
+{
+    XRPL_ASSERT(
+        (sle->getType() == ltRIPPLE_STATE && (field == sfHighSponsor || field == sfLowSponsor)) ||
+            (sle->getType() != ltRIPPLE_STATE && field == sfSponsor),
+        "removeSponsorFromLedgerEntry : Invalid field to the LedgerEntry");
+    if (sle->isFieldPresent(field))
+        sle->makeFieldAbsent(field);
+}
+
+}  // namespace xrpl