diff --git a/src/components/stepThree/index.js b/src/components/stepThree/index.js
index 8f5597980..5f8aa388a 100644
--- a/src/components/stepThree/index.js
+++ b/src/components/stepThree/index.js
@@ -132,15 +132,24 @@ export class stepThree extends React.Component {
 
     const { tierStore, gasPriceStore } = this.props
     const gasPriceIsValid = gasPriceStore.custom.id !== this.state.gasPriceSelected || this.state.validation.gasPrice.valid === VALID
-
-    console.log('gasPriceIsValid', gasPriceIsValid)
+    const isMinCapValid = tierStore.globalMinCap <= tierStore.maxSupply
 
     for (let index = 0; index < tierStore.tiers.length; index++) {
       tierStore.validateTiers('endTime', index)
       tierStore.validateTiers('startTime', index)
     }
 
-    if (tierStore.areTiersValid && gasPriceIsValid) {
+    if (!isMinCapValid) {
+      this.setState(update(this.state, {
+        validation: {
+          minCap: {
+            valid: { $set: INVALID }
+          }
+        }
+      }))
+    }
+
+    if (tierStore.areTiersValid && gasPriceIsValid && isMinCapValid) {
       const { reservedTokenStore, deploymentStore } = this.props
       const tiersCount = tierStore.tiers.length
       const reservedCount = reservedTokenStore.tokens.length
diff --git a/src/stores/TierStore.js b/src/stores/TierStore.js
index fe4b972d0..f7a7e7506 100644
--- a/src/stores/TierStore.js
+++ b/src/stores/TierStore.js
@@ -186,6 +186,10 @@ class TierStore {
     whitelist[whitelistNum].deleted = true
     this.setTierProperty(whitelist, 'whitelist', crowdsaleNum)
   }
+
+  @computed get maxSupply () {
+    return this.tiers.map(tier => +tier.supply).reduce((a, b) => Math.max(a, b), 0)
+  }
 }
 
 export default TierStore;
diff --git a/src/stores/TierStore.spec.js b/src/stores/TierStore.spec.js
new file mode 100644
index 000000000..1bb2d8bee
--- /dev/null
+++ b/src/stores/TierStore.spec.js
@@ -0,0 +1,37 @@
+import TierStore from './TierStore'
+
+describe('TierStore', () => {
+  describe('maxSupply', () => {
+    const testCases = [{
+      tiers: [],
+      expected: 0
+    }, {
+      tiers: [5],
+      expected: 5
+    }, {
+      tiers: [5, 10],
+      expected: 10
+    }, {
+      tiers: [10, 5],
+      expected: 10
+    }, {
+      tiers: [10, 10],
+      expected: 10
+    }]
+
+    testCases.forEach(({ tiers, expected }) => {
+      it(`should get the max supply for tiers ${JSON.stringify(tiers)}`, () => {
+        const tierStore = new TierStore()
+
+        tierStore.emptyList()
+        tiers.forEach(tier => tierStore.addTier({
+          supply: tier
+        }))
+
+        const result = tierStore.maxSupply
+
+        expect(result).toEqual(expected)
+      })
+    })
+  })
+})
diff --git a/src/utils/constants.js b/src/utils/constants.js
index 0e35038f8..46aca01c1 100644
--- a/src/utils/constants.js
+++ b/src/utils/constants.js
@@ -117,7 +117,7 @@ export const VALIDATION_MESSAGES = {
   EDITED_END_TIME: 'Please enter a valid date later than start time and previous than start time of next tier',
   EDITED_START_TIME: 'Please enter a valid date later than now, less than end time and later than the end time of the previous tier',
   RATE: 'Please enter a valid number greater than 0',
-  MINCAP: 'Value must be positive and decimals should not exceed the amount of decimals specified'
+  MINCAP: 'Value must be positive, decimals should not exceed the amount of decimals specified and min cap should be less or equal than the supply of some tier'
 }
 
 //descriptions of input fields