diff --git a/source/components/Controls.css b/source/components/Controls.css
new file mode 100644
index 000000000..e3ceef793
--- /dev/null
+++ b/source/components/Controls.css
@@ -0,0 +1,4 @@
+.controls {
+	text-align: center;
+	font-size: 150%;
+}
diff --git a/source/components/Controls.js b/source/components/Controls.js
new file mode 100644
index 000000000..69735fba1
--- /dev/null
+++ b/source/components/Controls.js
@@ -0,0 +1,6 @@
+import React from 'react'
+import './Controls.css'
+
+export default ({ blockingInputControls }) => (
+	<p className="controls">{blockingInputControls[0].message}</p>
+)
diff --git a/source/components/Simu.js b/source/components/Simu.js
index 05f1452e9..b616f8d13 100644
--- a/source/components/Simu.js
+++ b/source/components/Simu.js
@@ -1,6 +1,9 @@
 import React, { Component } from 'react'
 import { connect } from 'react-redux'
-import { noUserInputSelector } from 'Selectors/analyseSelectors'
+import {
+	noUserInputSelector,
+	analysisWithDefaultsSelector
+} from 'Selectors/analyseSelectors'
 import Conversation from './conversation/Conversation'
 import FoldedSteps, { GoToAnswers } from './conversation/FoldedSteps'
 import GoToExplanations from './GoToExplanations'
@@ -14,11 +17,17 @@ import withColours from './withColours'
 @withColours
 @connect(state => ({
 	noUserInput: noUserInputSelector(state),
+	analysis: analysisWithDefaultsSelector(state),
 	conversationStarted: state.conversationStarted
 }))
 export default class Simu extends Component {
 	render() {
-		let { colours, conversationStarted, noUserInput } = this.props
+		let {
+			colours,
+			conversationStarted,
+			noUserInput,
+			analysis: { blockingInputControls }
+		} = this.props
 
 		return (
 			<div id="simu">
@@ -32,10 +41,10 @@ export default class Simu extends Component {
 							<Conversation textColourOnWhite={colours.textColourOnWhite} />
 						</>
 					)}
-					{!noUserInput && <GoToExplanations />}
+					{!noUserInput && !blockingInputControls && <GoToExplanations />}
 				</div>
-				{!noUserInput && <ResultView />}
-				<Sondage />
+				{!noUserInput && !blockingInputControls && <ResultView />}
+				{!blockingInputControls && <Sondage />}
 			</div>
 		)
 	}
diff --git a/source/components/TargetSelection.js b/source/components/TargetSelection.js
index e378016f8..dbb4c7b19 100644
--- a/source/components/TargetSelection.js
+++ b/source/components/TargetSelection.js
@@ -18,6 +18,7 @@ import ProgressCircle from './ProgressCircle/ProgressCircle'
 import { RuleValue } from './rule/RuleValueVignette'
 import './TargetSelection.css'
 import withLanguage from './withLanguage'
+import Controls from './Controls'
 
 let salaries = [
 	'contrat salarié . salaire . total',
@@ -55,7 +56,7 @@ export let popularTargetNames = [
 )
 export default class TargetSelection extends Component {
 	render() {
-		let { conversationStarted, colours, noUserInput } = this.props
+		let { conversationStarted, colours, noUserInput, analysis } = this.props
 		return (
 			<div id="targetSelection">
 				<section
@@ -67,12 +68,18 @@ export default class TargetSelection extends Component {
 					{this.renderOutputList()}
 				</section>
 				{noUserInput && (
-					<h1>
+					<p className="controls">
 						<Trans i18nKey="enterSalary">Entrez un salaire mensuel</Trans>
-					</h1>
+					</p>
 				)}
 
+				{analysis &&
+					analysis.blockingInputControls && (
+						<Controls blockingInputControls={analysis.blockingInputControls} />
+					)}
+
 				{!noUserInput &&
+					!(analysis && analysis.blockingInputControls) &&
 					!conversationStarted && (
 						<div id="action">
 							<p>
@@ -122,7 +129,9 @@ export default class TargetSelection extends Component {
 										activeInput,
 										setActiveInput,
 										setFormValue: this.props.setFormValue,
-										noUserInput
+										noUserInput,
+										blockingInputControls:
+											analysis && analysis.blockingInputControls
 									}}
 								/>
 							</div>
@@ -175,7 +184,15 @@ let CurrencyField = props => {
 }
 
 let TargetInputOrValue = withLanguage(
-	({ target, targets, activeInput, setActiveInput, language, noUserInput }) => (
+	({
+		target,
+		targets,
+		activeInput,
+		setActiveInput,
+		language,
+		noUserInput,
+		blockingInputControls
+	}) => (
 		<span className="targetInputOrValue">
 			{activeInput === target.dottedName ? (
 				<Field
@@ -185,7 +202,14 @@ let TargetInputOrValue = withLanguage(
 				/>
 			) : (
 				<TargetValue
-					{...{ targets, target, activeInput, setActiveInput, noUserInput }}
+					{...{
+						targets,
+						target,
+						activeInput,
+						setActiveInput,
+						noUserInput,
+						blockingInputControls
+					}}
 				/>
 			)}
 		</span>
@@ -200,28 +224,32 @@ let TargetInputOrValue = withLanguage(
 class TargetValue extends Component {
 	render() {
 		let {
-				targets,
-				target,
-				setFormValue,
-				activeInput,
-				setActiveInput,
-				noUserInput
-			} = this.props,
-			targetWithValue = targets.find(propEq('dottedName', target.dottedName)),
+			targets,
+			target,
+			setFormValue,
+			activeInput,
+			setActiveInput,
+			noUserInput,
+			blockingInputControls
+		} = this.props
+
+		let targetWithValue =
+				targets && targets.find(propEq('dottedName', target.dottedName)),
 			value = targetWithValue && targetWithValue.nodeValue
 
 		return (
 			<span
 				className={classNames({
 					editable: target.question,
-					attractClick: target.question && noUserInput
+					attractClick:
+						target.question && (noUserInput || blockingInputControls)
 				})}
 				onClick={() => {
 					if (!target.question) return
-					if (value != null) {
+					if (value != null)
 						setFormValue(target.dottedName, Math.floor(value) + '')
-						setFormValue(activeInput, '')
-					}
+
+					if (activeInput) setFormValue(activeInput, '')
 					setActiveInput(target.dottedName)
 				}}>
 				<RuleValue value={value} />
diff --git a/source/engine/traverse.js b/source/engine/traverse.js
index 5e3286a03..33a2dcd56 100644
--- a/source/engine/traverse.js
+++ b/source/engine/traverse.js
@@ -194,10 +194,6 @@ export let treatRuleRoot = (rules, rule) => {
 		}
 	})(rule)
 
-	//	let evaluateControl = () => {
-	//evaluate with situation
-	//return message or null
-	//}
 	let controls =
 		rule['contrôles'] &&
 		rule['contrôles'].map(control => {
@@ -215,6 +211,7 @@ export let treatRuleRoot = (rules, rule) => {
 			return {
 				level: control['niveau'],
 				test: control['si'],
+				message: control['message'],
 				testExpression,
 				...(!otherVariables.length ? { isInputControl: true } : {})
 			}
diff --git a/source/règles/base.yaml b/source/règles/base.yaml
index acef1ec75..ec5f91615 100644
--- a/source/règles/base.yaml
+++ b/source/règles/base.yaml
@@ -677,12 +677,12 @@
     salaire médian: 2300
     SMIC: 1500
   contrôles: 
+    - si: brut de base < 300
+      message: Entrez un salaire mensuel
+      niveau: bloquant
   #    - si: brut de base < smic mensuel
   #    message: Le salaire saisi semble inférieur au SMIC.
   #    niveau: avertissement
-    - si: brut de base < 200
-      message: Le simulateur ne prend pour l'instant que des salaires mensuels
-      niveau: bloquant
     - si: brut de base > 100000
       message: N'avez-vous pas saisi un zéro de trop ?
       niveau: information
@@ -865,6 +865,10 @@
   description: |
     C'est le montant que le salarié touche à la fin du mois.
   formule: salaire . net - avantages en nature . montant
+  contrôles: 
+    - si: net à payer < 200
+      message: Entrez un salaire mensuel
+      niveau: bloquant
 
 - espace: contrat salarié
   nom: coût du travail
@@ -891,6 +895,10 @@
     Des [aides différées](/règle/aides employeur) peuvent venir diminuer ce montant.
 
   formule: salaire . total sans réduction - réductions de cotisations
+  contrôles: 
+    - si: total < 400
+      message: Entrez un salaire mensuel
+      niveau: bloquant
 
 - espace: contrat salarié
   nom: réductions de cotisations