diff --git a/js/src/index.js b/js/src/index.js
index 28abe953b..d1f9ac580 100644
--- a/js/src/index.js
+++ b/js/src/index.js
@@ -36,7 +36,7 @@ import ContextProvider from '~/ui/ContextProvider';
 import muiTheme from '~/ui/Theme';
 import MainApplication from './main';
 
-import { patchApi } from '~/util/tx';
+import { loadSender, patchApi } from '~/util/tx';
 import { setApi } from '~/redux/providers/apiActions';
 
 import './environment';
@@ -66,6 +66,7 @@ if (window.location.hash && window.location.hash.indexOf(AUTH_HASH) === 0) {
 const api = new SecureApi(`${urlScheme}${parityUrl}`, token);
 
 patchApi(api);
+loadSender(api);
 ContractInstances.create(api);
 
 const store = initStore(api, hashHistory);
diff --git a/js/src/modals/CreateWallet/createWallet.spec.js b/js/src/modals/CreateWallet/createWallet.spec.js
index 45c9776e1..e38174b81 100644
--- a/js/src/modals/CreateWallet/createWallet.spec.js
+++ b/js/src/modals/CreateWallet/createWallet.spec.js
@@ -27,7 +27,11 @@ let component;
 let onClose;
 
 function createApi () {
-  api = {};
+  api = {
+    parity: {
+      getNewDappsDefaultAddress: sinon.stub().resolves('')
+    }
+  };
 
   return api;
 }
diff --git a/js/src/modals/CreateWallet/createWalletStore.js b/js/src/modals/CreateWallet/createWalletStore.js
index 740aa8f17..dd243f179 100644
--- a/js/src/modals/CreateWallet/createWalletStore.js
+++ b/js/src/modals/CreateWallet/createWalletStore.js
@@ -26,7 +26,7 @@ import { wallet as walletCode, walletLibrary as walletLibraryCode, walletLibrary
 
 import { validateUint, validateAddress, validateName } from '~/util/validation';
 import { toWei } from '~/api/util/wei';
-import { deploy } from '~/util/tx';
+import { deploy, getSender, loadSender, setSender } from '~/util/tx';
 import WalletsUtils from '~/util/wallets';
 
 const STEPS = {
@@ -120,10 +120,17 @@ export default class CreateWalletStore {
     this.api = api;
 
     this.step = this.stepsKeys[0];
-    this.wallet.account = Object.values(accounts)[0].address;
+    this.wallet.account = getSender() || Object.values(accounts)[0].address;
     this.validateWallet(this.wallet);
     this.onClose = onClose;
     this.onSetRequest = onSetRequest;
+
+    loadSender(this.api)
+      .then((defaultAccount) => {
+        if (defaultAccount !== this.wallet.account) {
+          this.onChange({ account: defaultAccount });
+        }
+      });
   }
 
   @action onTypeChange = (type) => {
@@ -221,6 +228,7 @@ export default class CreateWalletStore {
 
         const contract = this.api.newContract(walletAbi);
 
+        setSender(account);
         this.wallet = this.getWalletWithMeta(this.wallet);
         this.onClose();
         return deploy(contract, options, [ owners, required, daylimit ])
diff --git a/js/src/modals/DeployContract/deployContract.js b/js/src/modals/DeployContract/deployContract.js
index 0f5b4e1d8..a5d6c6b34 100644
--- a/js/src/modals/DeployContract/deployContract.js
+++ b/js/src/modals/DeployContract/deployContract.js
@@ -24,7 +24,7 @@ import { bindActionCreators } from 'redux';
 import { Button, GasPriceEditor, IdentityIcon, Portal, Warning } from '~/ui';
 import { CancelIcon } from '~/ui/Icons';
 import { ERRORS, validateAbi, validateCode, validateName, validatePositiveNumber } from '~/util/validation';
-import { deploy, deployEstimateGas } from '~/util/tx';
+import { deploy, deployEstimateGas, getSender, loadSender, setSender } from '~/util/tx';
 import { setRequest } from '~/redux/providers/requestsActions';
 
 import DetailsStep from './DetailsStep';
@@ -94,7 +94,7 @@ class DeployContract extends Component {
     description: '',
     descriptionError: null,
     extras: false,
-    fromAddress: Object.keys(this.props.accounts)[0],
+    fromAddress: getSender() || Object.keys(this.props.accounts)[0],
     fromAddressError: null,
     name: '',
     nameError: ERRORS.invalidName,
@@ -110,6 +110,13 @@ class DeployContract extends Component {
     if (abi && code) {
       this.setState({ abi, code });
     }
+
+    loadSender(this.context.api)
+      .then((defaultAccount) => {
+        if (defaultAccount !== this.state.fromAddress) {
+          this.setState({ fromAddress: defaultAccount });
+        }
+      });
   }
 
   componentWillReceiveProps (nextProps) {
@@ -467,6 +474,7 @@ class DeployContract extends Component {
 
     const contract = api.newContract(abiParsed);
 
+    setSender(fromAddress);
     this.onClose();
     deploy(contract, options, params, true)
       .then((requestId) => {
diff --git a/js/src/modals/ExecuteContract/executeContract.js b/js/src/modals/ExecuteContract/executeContract.js
index e0566f7df..0f648dece 100644
--- a/js/src/modals/ExecuteContract/executeContract.js
+++ b/js/src/modals/ExecuteContract/executeContract.js
@@ -25,6 +25,7 @@ import { CancelIcon, NextIcon, PrevIcon } from '~/ui/Icons';
 import { MAX_GAS_ESTIMATION } from '~/util/constants';
 import { validateAddress, validateUint } from '~/util/validation';
 import { parseAbiType } from '~/util/abi';
+import { setSender } from '~/util/tx';
 
 import AdvancedStep from './AdvancedStep';
 import DetailsStep from './DetailsStep';
@@ -307,6 +308,7 @@ class ExecuteContract extends Component {
       value: api.util.toWei(amount || 0)
     });
 
+    setSender(fromAddress);
     func.postTransaction(options, values);
     this.onClose();
   }
diff --git a/js/src/util/tx.js b/js/src/util/tx.js
index b56fc8b1f..9ab8b6599 100644
--- a/js/src/util/tx.js
+++ b/js/src/util/tx.js
@@ -16,6 +16,38 @@
 
 import WalletsUtils from '~/util/wallets';
 
+/**
+ * The sender is by default (when the UI loads) the
+ * default dapp address. It can then be modified when
+ * sending transactions....
+ */
+let currentSender = '';
+let hasCurrentSenderChanged = false;
+
+export function getSender () {
+  currentSender;
+}
+
+export function loadSender (api) {
+  // If the current sender has been changed
+  // then don't bother checking changes of the
+  // default sender
+  if (hasCurrentSenderChanged) {
+    return Promise.resolve(currentSender);
+  }
+
+  return api.parity.getNewDappsDefaultAddress()
+    .then((defaultAccount) => {
+      currentSender = defaultAccount;
+      return defaultAccount;
+    });
+}
+
+export function setSender (sender) {
+  currentSender = sender;
+  hasCurrentSenderChanged = true;
+}
+
 export function trackRequest (api, options, statusCallback) {
   const { requestId, transactionHash } = options;
   const txHashPromise = transactionHash
diff --git a/js/src/views/Contract/contract.js b/js/src/views/Contract/contract.js
index cc6b35d2b..b362d0d0d 100644
--- a/js/src/views/Contract/contract.js
+++ b/js/src/views/Contract/contract.js
@@ -26,6 +26,7 @@ import { setVisibleAccounts } from '~/redux/providers/personalActions';
 import { Actionbar, Button, Page, Portal } from '~/ui';
 import { CancelIcon, DeleteIcon, EditIcon, PlayIcon, VisibleIcon } from '~/ui/Icons';
 import Editor from '~/ui/Editor';
+import { getSender, loadSender } from '~/util/tx';
 
 import Header from '../Account/Header';
 import Delete from '../Address/Delete';
@@ -52,7 +53,7 @@ class Contract extends Component {
 
   state = {
     contract: null,
-    fromAddress: '',
+    fromAddress: getSender(),
     showDeleteDialog: false,
     showEditDialog: false,
     showExecuteDialog: false,
@@ -76,6 +77,13 @@ class Contract extends Component {
     api
       .subscribe('eth_blockNumber', this.queryContract)
       .then(blockSubscriptionId => this.setState({ blockSubscriptionId }));
+
+    loadSender(api)
+      .then((defaultAccount) => {
+        if (defaultAccount !== this.state.fromAddress) {
+          this.onFromAddressChange(null, defaultAccount);
+        }
+      });
   }
 
   componentWillReceiveProps (nextProps) {