diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 2775f4def3d..be5d692c927 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -1154,6 +1154,8 @@ isminetype CWallet::IsMine(const CTxIn &txin) const
     return ISMINE_NO;
 }
 
+// Note that this function doesn't distinguish between a 0-valued input,
+// and a not-"is mine" (according to the filter) input.
 CAmount CWallet::GetDebit(const CTxIn &txin, const isminefilter& filter) const
 {
     {
@@ -1236,6 +1238,27 @@ CAmount CWallet::GetDebit(const CTransaction& tx, const isminefilter& filter) co
     return nDebit;
 }
 
+bool CWallet::IsAllFromMe(const CTransaction& tx, const isminefilter& filter) const
+{
+    LOCK(cs_wallet);
+
+    BOOST_FOREACH(const CTxIn& txin, tx.vin)
+    {
+        auto mi = mapWallet.find(txin.prevout.hash);
+        if (mi == mapWallet.end())
+            return false; // any unknown inputs can't be from us
+
+        const CWalletTx& prev = (*mi).second;
+
+        if (txin.prevout.n >= prev.tx->vout.size())
+            return false; // invalid input!
+
+        if (!(IsMine(prev.tx->vout[txin.prevout.n]) & filter))
+            return false;
+    }
+    return true;
+}
+
 CAmount CWallet::GetCredit(const CTransaction& tx, const isminefilter& filter) const
 {
     CAmount nCredit = 0;
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index b9fa6bb24b3..8a587f4ed04 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -825,6 +825,10 @@ public:
     std::set<CTxDestination> GetAccountAddresses(const std::string& strAccount) const;
 
     isminetype IsMine(const CTxIn& txin) const;
+    /**
+     * Returns amount of debit if the input matches the
+     * filter, otherwise returns 0
+     */
     CAmount GetDebit(const CTxIn& txin, const isminefilter& filter) const;
     isminetype IsMine(const CTxOut& txout) const;
     CAmount GetCredit(const CTxOut& txout, const isminefilter& filter) const;
@@ -834,6 +838,8 @@ public:
     /** should probably be renamed to IsRelevantToMe */
     bool IsFromMe(const CTransaction& tx) const;
     CAmount GetDebit(const CTransaction& tx, const isminefilter& filter) const;
+    /** Returns whether all of the inputs match the filter */
+    bool IsAllFromMe(const CTransaction& tx, const isminefilter& filter) const;
     CAmount GetCredit(const CTransaction& tx, const isminefilter& filter) const;
     CAmount GetChange(const CTransaction& tx) const;
     void SetBestChain(const CBlockLocator& loc);