diff --git a/ci/test/06_script_b.sh b/ci/test/06_script_b.sh
index e64af2ad5dd..bdb68e0f6f4 100755
--- a/ci/test/06_script_b.sh
+++ b/ci/test/06_script_b.sh
@@ -41,6 +41,9 @@ if [ "${RUN_TIDY}" = "true" ]; then
   CI_EXEC "python3 ${DIR_IWYU}/include-what-you-use/iwyu_tool.py"\
           " src/compat"\
           " src/init"\
+          " src/policy/feerate.cpp"\
+          " src/policy/packages.cpp"\
+          " src/policy/settings.cpp"\
           " src/rpc/fees.cpp"\
           " src/rpc/signmessage.cpp"\
           " -p . ${MAKEJOBS} -- -Xiwyu --cxx17ns -Xiwyu --mapping_file=${BASE_BUILD_DIR}/bitcoin-$HOST/contrib/devtools/iwyu/bitcoin.core.imp"
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index 70b81b3eb23..30d55483859 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -21,6 +21,7 @@
 #include <node/blockstorage.h>
 #include <policy/fees.h>
 #include <policy/policy.h>
+#include <policy/settings.h>
 #include <primitives/block.h>
 #include <primitives/transaction.h>
 #include <random.h>
diff --git a/src/policy/feerate.cpp b/src/policy/feerate.cpp
index 0ea56d8db7a..82b767793d9 100644
--- a/src/policy/feerate.cpp
+++ b/src/policy/feerate.cpp
@@ -3,8 +3,8 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+#include <consensus/amount.h>
 #include <policy/feerate.h>
-
 #include <tinyformat.h>
 
 #include <cmath>
diff --git a/src/policy/feerate.h b/src/policy/feerate.h
index 50fd6fd11bb..a8d4d2fc63b 100644
--- a/src/policy/feerate.h
+++ b/src/policy/feerate.h
@@ -9,7 +9,10 @@
 #include <consensus/amount.h>
 #include <serialize.h>
 
+
+#include <cstdint>
 #include <string>
+#include <type_traits>
 
 const std::string CURRENCY_UNIT = "BTC"; // One formatted unit
 const std::string CURRENCY_ATOM = "sat"; // One indivisible minimum value unit
diff --git a/src/policy/fees.cpp b/src/policy/fees.cpp
index d2deaf69d09..b39632364f1 100644
--- a/src/policy/fees.cpp
+++ b/src/policy/fees.cpp
@@ -6,12 +6,30 @@
 #include <policy/fees.h>
 
 #include <clientversion.h>
+#include <consensus/amount.h>
 #include <fs.h>
 #include <logging.h>
+#include <policy/feerate.h>
+#include <primitives/transaction.h>
+#include <random.h>
+#include <serialize.h>
 #include <streams.h>
+#include <sync.h>
+#include <tinyformat.h>
 #include <txmempool.h>
+#include <uint256.h>
 #include <util/serfloat.h>
 #include <util/system.h>
+#include <util/time.h>
+
+#include <algorithm>
+#include <cassert>
+#include <cmath>
+#include <cstddef>
+#include <cstdint>
+#include <exception>
+#include <stdexcept>
+#include <utility>
 
 static const char* FEE_ESTIMATES_FILENAME = "fee_estimates.dat";
 
diff --git a/src/policy/fees.h b/src/policy/fees.h
index 6e25bb42b8a..dea1e1d31bc 100644
--- a/src/policy/fees.h
+++ b/src/policy/fees.h
@@ -7,20 +7,20 @@
 
 #include <consensus/amount.h>
 #include <policy/feerate.h>
-#include <uint256.h>
 #include <random.h>
 #include <sync.h>
+#include <threadsafety.h>
+#include <uint256.h>
 
 #include <array>
 #include <map>
 #include <memory>
+#include <set>
 #include <string>
 #include <vector>
 
 class CAutoFile;
-class CFeeRate;
 class CTxMemPoolEntry;
-class CTxMemPool;
 class TxConfirmStats;
 
 /* Identifier for each of the 3 different TxConfirmStats which will track
diff --git a/src/policy/packages.cpp b/src/policy/packages.cpp
index 21f54888160..67918c9decf 100644
--- a/src/policy/packages.cpp
+++ b/src/policy/packages.cpp
@@ -2,12 +2,16 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#include <consensus/validation.h>
 #include <policy/packages.h>
+#include <policy/policy.h>
 #include <primitives/transaction.h>
 #include <uint256.h>
 #include <util/hasher.h>
 
+#include <algorithm>
+#include <cassert>
+#include <iterator>
+#include <memory>
 #include <numeric>
 #include <unordered_set>
 
diff --git a/src/policy/packages.h b/src/policy/packages.h
index 9f274f6b7d1..ba6a3a9a06c 100644
--- a/src/policy/packages.h
+++ b/src/policy/packages.h
@@ -5,10 +5,12 @@
 #ifndef BITCOIN_POLICY_PACKAGES_H
 #define BITCOIN_POLICY_PACKAGES_H
 
+#include <consensus/consensus.h>
 #include <consensus/validation.h>
 #include <policy/policy.h>
 #include <primitives/transaction.h>
 
+#include <cstdint>
 #include <vector>
 
 /** Default maximum number of transactions in a package. */
diff --git a/src/policy/policy.cpp b/src/policy/policy.cpp
index 6aba6a4a5b3..f6452266b7f 100644
--- a/src/policy/policy.cpp
+++ b/src/policy/policy.cpp
@@ -7,10 +7,22 @@
 
 #include <policy/policy.h>
 
-#include <consensus/validation.h>
 #include <coins.h>
+#include <consensus/amount.h>
+#include <consensus/consensus.h>
+#include <consensus/validation.h>
+#include <policy/feerate.h>
+#include <primitives/transaction.h>
+#include <script/interpreter.h>
+#include <script/script.h>
+#include <script/standard.h>
+#include <serialize.h>
 #include <span.h>
 
+#include <algorithm>
+#include <cstddef>
+#include <vector>
+
 CAmount GetDustThreshold(const CTxOut& txout, const CFeeRate& dustRelayFeeIn)
 {
     // "Dust" is defined in terms of dustRelayFee,
diff --git a/src/policy/policy.h b/src/policy/policy.h
index 89f6e72618c..94f9623b8a5 100644
--- a/src/policy/policy.h
+++ b/src/policy/policy.h
@@ -6,15 +6,18 @@
 #ifndef BITCOIN_POLICY_POLICY_H
 #define BITCOIN_POLICY_POLICY_H
 
+#include <consensus/amount.h>
 #include <consensus/consensus.h>
-#include <policy/feerate.h>
+#include <primitives/transaction.h>
 #include <script/interpreter.h>
 #include <script/standard.h>
 
+#include <cstdint>
 #include <string>
 
 class CCoinsViewCache;
-class CTxOut;
+class CFeeRate;
+class CScript;
 
 /** Default for -blockmaxweight, which controls the range of block weights the mining code will create **/
 static const unsigned int DEFAULT_BLOCK_MAX_WEIGHT = MAX_BLOCK_WEIGHT - 4000;
@@ -52,6 +55,8 @@ static const unsigned int MAX_STANDARD_SCRIPTSIG_SIZE = 1650;
  * only increase the dust limit after prior releases were already not creating
  * outputs below the new threshold */
 static const unsigned int DUST_RELAY_TX_FEE = 3000;
+/** Default for -minrelaytxfee, minimum relay fee for transactions */
+static const unsigned int DEFAULT_MIN_RELAY_TX_FEE = 1000;
 /**
  * Standard script verification flags that standard transactions will comply
  * with. However scripts violating these flags may still be present in valid
diff --git a/src/policy/rbf.cpp b/src/policy/rbf.cpp
index 8fe4dc35b83..e25f5c7c5bd 100644
--- a/src/policy/rbf.cpp
+++ b/src/policy/rbf.cpp
@@ -4,11 +4,19 @@
 
 #include <policy/rbf.h>
 
-#include <policy/settings.h>
+#include <consensus/amount.h>
+#include <policy/feerate.h>
+#include <primitives/transaction.h>
+#include <sync.h>
 #include <tinyformat.h>
+#include <txmempool.h>
+#include <uint256.h>
 #include <util/moneystr.h>
 #include <util/rbf.h>
 
+#include <limits>
+#include <vector>
+
 RBFTransactionState IsRBFOptIn(const CTransaction& tx, const CTxMemPool& pool)
 {
     AssertLockHeld(pool.cs);
diff --git a/src/policy/rbf.h b/src/policy/rbf.h
index fcec7052edf..07f68c8fd4e 100644
--- a/src/policy/rbf.h
+++ b/src/policy/rbf.h
@@ -5,13 +5,20 @@
 #ifndef BITCOIN_POLICY_RBF_H
 #define BITCOIN_POLICY_RBF_H
 
+#include <consensus/amount.h>
 #include <primitives/transaction.h>
+#include <threadsafety.h>
 #include <txmempool.h>
-#include <uint256.h>
 
+#include <cstddef>
+#include <cstdint>
 #include <optional>
+#include <set>
 #include <string>
 
+class CFeeRate;
+class uint256;
+
 /** Maximum number of transactions that can be replaced by BIP125 RBF (Rule #5). This includes all
  * mempool conflicts and their descendants. */
 static constexpr uint32_t MAX_BIP125_REPLACEMENT_CANDIDATES{100};
diff --git a/src/policy/settings.cpp b/src/policy/settings.cpp
index eb2ec56850e..0b67d274ce8 100644
--- a/src/policy/settings.cpp
+++ b/src/policy/settings.cpp
@@ -11,4 +11,5 @@
 bool fIsBareMultisigStd = DEFAULT_PERMIT_BAREMULTISIG;
 CFeeRate incrementalRelayFee = CFeeRate(DEFAULT_INCREMENTAL_RELAY_FEE);
 CFeeRate dustRelayFee = CFeeRate(DUST_RELAY_TX_FEE);
+CFeeRate minRelayTxFee = CFeeRate(DEFAULT_MIN_RELAY_TX_FEE);
 unsigned int nBytesPerSigOp = DEFAULT_BYTES_PER_SIGOP;
diff --git a/src/policy/settings.h b/src/policy/settings.h
index 0b4fc1e7707..2311d01fe8b 100644
--- a/src/policy/settings.h
+++ b/src/policy/settings.h
@@ -6,14 +6,19 @@
 #ifndef BITCOIN_POLICY_SETTINGS_H
 #define BITCOIN_POLICY_SETTINGS_H
 
+#include <policy/feerate.h>
 #include <policy/policy.h>
 
-class CFeeRate;
+#include <cstdint>
+#include <string>
+
 class CTransaction;
 
 // Policy settings which are configurable at runtime.
 extern CFeeRate incrementalRelayFee;
 extern CFeeRate dustRelayFee;
+/** A fee rate smaller than this is considered zero fee (for relaying, mining and transaction creation) */
+extern CFeeRate minRelayTxFee;
 extern unsigned int nBytesPerSigOp;
 extern bool fIsBareMultisigStd;
 
diff --git a/src/rpc/fees.cpp b/src/rpc/fees.cpp
index bfec0780aa6..1873bc1587d 100644
--- a/src/rpc/fees.cpp
+++ b/src/rpc/fees.cpp
@@ -7,6 +7,7 @@
 #include <policy/feerate.h>
 #include <policy/fees.h>
 #include <policy/policy.h>
+#include <policy/settings.h>
 #include <rpc/protocol.h>
 #include <rpc/request.h>
 #include <rpc/server.h>
@@ -16,7 +17,6 @@
 #include <univalue.h>
 #include <util/fees.h>
 #include <util/system.h>
-#include <validation.h>
 
 #include <algorithm>
 #include <array>
diff --git a/src/rpc/mempool.cpp b/src/rpc/mempool.cpp
index 90dc86cd015..97ec95a166b 100644
--- a/src/rpc/mempool.cpp
+++ b/src/rpc/mempool.cpp
@@ -8,6 +8,7 @@
 #include <core_io.h>
 #include <fs.h>
 #include <policy/rbf.h>
+#include <policy/settings.h>
 #include <primitives/transaction.h>
 #include <rpc/server.h>
 #include <rpc/server_util.h>
@@ -15,7 +16,6 @@
 #include <txmempool.h>
 #include <univalue.h>
 #include <util/moneystr.h>
-#include <validation.h>
 
 using node::DEFAULT_MAX_RAW_TX_FEE_RATE;
 using node::NodeContext;
diff --git a/src/test/fuzz/tx_out.cpp b/src/test/fuzz/tx_out.cpp
index 39a50b6c80c..a2421ff582e 100644
--- a/src/test/fuzz/tx_out.cpp
+++ b/src/test/fuzz/tx_out.cpp
@@ -4,6 +4,7 @@
 
 #include <consensus/validation.h>
 #include <core_memusage.h>
+#include <policy/feerate.h>
 #include <policy/policy.h>
 #include <primitives/transaction.h>
 #include <streams.h>
diff --git a/src/validation.cpp b/src/validation.cpp
index 448720ff832..23ad221ffef 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -134,8 +134,6 @@ int64_t nMaxTipAge = DEFAULT_MAX_TIP_AGE;
 uint256 hashAssumeValid;
 arith_uint256 nMinimumChainWork;
 
-CFeeRate minRelayTxFee = CFeeRate(DEFAULT_MIN_RELAY_TX_FEE);
-
 const CBlockIndex* CChainState::FindForkInGlobalIndex(const CBlockLocator& locator) const
 {
     AssertLockHeld(cs_main);
diff --git a/src/validation.h b/src/validation.h
index 31dd0890053..cc94add3cb5 100644
--- a/src/validation.h
+++ b/src/validation.h
@@ -58,8 +58,6 @@ namespace Consensus {
 struct Params;
 } // namespace Consensus
 
-/** Default for -minrelaytxfee, minimum relay fee for transactions */
-static const unsigned int DEFAULT_MIN_RELAY_TX_FEE = 1000;
 /** Default for -limitancestorcount, max number of in-mempool ancestors */
 static const unsigned int DEFAULT_ANCESTOR_LIMIT = 25;
 /** Default for -limitancestorsize, maximum kilobytes of tx + all in-mempool ancestors */
@@ -126,8 +124,6 @@ extern bool g_parallel_script_checks;
 extern bool fRequireStandard;
 extern bool fCheckBlockIndex;
 extern bool fCheckpointsEnabled;
-/** A fee rate smaller than this is considered zero fee (for relaying, mining and transaction creation) */
-extern CFeeRate minRelayTxFee;
 /** If the tip is older than this (in seconds), the node is considered to be in initial block download. */
 extern int64_t nMaxTipAge;