diff --git a/lib/plugins.js b/lib/plugins.js
index a6d2dad3..f1f1deb6 100644
--- a/lib/plugins.js
+++ b/lib/plugins.js
@@ -15,6 +15,7 @@ const wallet = require('./wallet')
 const exchange = require('./exchange')
 const sms = require('./sms')
 const email = require('./email')
+const settingsLoader = require('./settings-loader')
 
 const mapValuesWithKey = _.mapValues.convert({cap: false})
 
@@ -515,12 +516,48 @@ function plugins (settings, deviceId) {
     //
     // However, we should make all config changes atomic in the future.
     const config = configManager.machineScoped(deviceId, settings.config)
-    config.topCashOutDenomination -= tx.bills[0].actualDispense +
-      tx.bills[0].rejected
-    config.bottomCashOutDenomination -= tx.bills[1].actualDispense +
-      tx.bills[1].rejected
+    const topCashOutDenomination = config.topCashOutDenomination -
+      (tx.bills[0].actualDispense + tx.bills[0].rejected)
+    const bottomCashOutDenomination = config.bottomCashOutDenomination -
+      (tx.bills[1].actualDispense + tx.bills[1].rejected)
 
-    // save
+    const newFields = [
+      {
+        fieldLocator: {
+          fieldScope: {
+            crypto: 'global',
+            machine: deviceId
+          },
+          code: 'topCashOutDenomination',
+          fieldType: 'integer',
+          fieldClass: null
+        },
+        fieldValue: {
+          fieldType: 'integer',
+          value: topCashOutDenomination
+        }
+      },
+      {
+        fieldLocator: {
+          fieldScope: {
+            crypto: 'global',
+            machine: deviceId
+          },
+          code: 'bottomCashOutDenomination',
+          fieldType: 'integer',
+          fieldClass: null
+        },
+        fieldValue: {
+          fieldType: 'integer',
+          value: bottomCashOutDenomination
+        }
+      }
+    ]
+
+    return settingsLoader.loadLatest()
+    .then(settings => {
+      return settingsLoader.save({config: settingsLoader.mergeValues(settings.config, newFields)})
+    })
   }
 
   return {