diff --git a/app/models/Household.ts b/app/models/Household.ts
index f91f50fb..f290199c 100644
--- a/app/models/Household.ts
+++ b/app/models/Household.ts
@@ -88,6 +88,7 @@ export class Household {
         affordability: marketPurchase.affordability,
         landPriceOrRent: this.property.landPrice,
       }),
+      marketPurchase: marketPurchase
     });
 
     const fairholdLandRent = new FairholdLandRent({
@@ -103,6 +104,8 @@ export class Household {
         affordability: marketRent.affordability,
         landPriceOrRent: averageRentYearly,
       }), // fairhold object
+
+      marketPurchase: marketPurchase
     });
 
     return {
diff --git a/app/models/Mortgage.ts b/app/models/Mortgage.ts
index 63e7e4db..b5524e3e 100644
--- a/app/models/Mortgage.ts
+++ b/app/models/Mortgage.ts
@@ -35,6 +35,7 @@ export class Mortgage {
   monthlyPayment: number;
   totalMortgageCost: number;
   yearlyPaymentBreakdown: MortgageBreakdown;
+  totalInterest: number;
 
   constructor(params: MortgageParams) {
     this.propertyValue = params.propertyValue;
@@ -51,6 +52,7 @@ export class Mortgage {
     this.totalMortgageCost = totalMortgageCost;
 
     this.yearlyPaymentBreakdown = this.calculateYearlyPaymentBreakdown();
+    this.totalInterest = this.calculateTotalInterest();
   }
 
   private calculateMortgagePrinciple() {
@@ -110,4 +112,8 @@ export class Mortgage {
 
     return yearlyPaymentBreakdown;
   }
+  private calculateTotalInterest() {
+    const totalInterest = parseFloat((this.principal * this.interestRate * this.termYears).toFixed(2))
+    return totalInterest
+  }
 }
diff --git a/app/models/tenure/FairholdLandPurchase.test.ts b/app/models/tenure/FairholdLandPurchase.test.ts
index 58372edc..f3d78a64 100644
--- a/app/models/tenure/FairholdLandPurchase.test.ts
+++ b/app/models/tenure/FairholdLandPurchase.test.ts
@@ -1,10 +1,16 @@
 import { Fairhold } from "../Fairhold";
 import { DEFAULT_FORECAST_PARAMETERS, ForecastParameters } from "../ForecastParameters";
 import { FairholdLandPurchase } from "./FairholdLandPurchase";
+import { MarketPurchase } from "./MarketPurchase"
 
 let tenureFairholdLandPurchase: FairholdLandPurchase;
 
 beforeEach(() => {
+  // partial MarketPurchase object with only necessary properties for test (instead of mocking a whole MarketPurchase object)
+  const partialMarketPurchase: Pick<MarketPurchase, 'interestPaid'> = {
+    interestPaid: 200000, 
+  };
+
   const forecastParameters: ForecastParameters = {
     ...DEFAULT_FORECAST_PARAMETERS,
   };
@@ -20,7 +26,8 @@ beforeEach(() => {
       affordability: 0.2,
       landPriceOrRent: 31531.579,
     }),
-  forecastParameters: forecastParameters,
+    forecastParameters: forecastParameters,
+    marketPurchase: partialMarketPurchase as MarketPurchase
   });
 });
 
diff --git a/app/models/tenure/FairholdLandPurchase.ts b/app/models/tenure/FairholdLandPurchase.ts
index 44ffce48..b6e41005 100644
--- a/app/models/tenure/FairholdLandPurchase.ts
+++ b/app/models/tenure/FairholdLandPurchase.ts
@@ -1,6 +1,7 @@
 import { Fairhold } from "../Fairhold";
 import { Mortgage } from "../Mortgage";
 import { ForecastParameters } from '../ForecastParameters'; 
+import { MarketPurchase } from "./MarketPurchase";
 
 interface FairholdLandPurchaseParams {
   newBuildPrice: number;
@@ -8,6 +9,7 @@ interface FairholdLandPurchaseParams {
   affordability: number;
   fairhold: Fairhold;
   forecastParameters: ForecastParameters;
+  marketPurchase: MarketPurchase;
 }
 
 export class FairholdLandPurchase {
@@ -15,6 +17,9 @@ export class FairholdLandPurchase {
   discountedLandPrice: number;
   discountedLandMortgage: Mortgage;
   depreciatedHouseMortgage: Mortgage;
+  interestPaid: number;
+  /** interest saved relative to market purchase, pounds */
+  interestSaved: number;
 
   constructor(params: FairholdLandPurchaseParams) {
     this.params = params;
@@ -27,6 +32,20 @@ export class FairholdLandPurchase {
     this.depreciatedHouseMortgage = new Mortgage({
       propertyValue: params.depreciatedBuildPrice,
     });
+
+    this.interestPaid = 
+      this.calculateInterestPaid();
+
+    this.interestSaved = 
+      this.calculateInterestSaved(params.marketPurchase);
+  }
+
+  private calculateInterestPaid() {
+    return this.depreciatedHouseMortgage.totalInterest + this.discountedLandMortgage.totalInterest;
+  }
+
+  private calculateInterestSaved(marketPurchase: MarketPurchase): number {
+    return marketPurchase.interestPaid - this.interestPaid;
   }
 
 }
diff --git a/app/models/tenure/FairholdLandRent.test.ts b/app/models/tenure/FairholdLandRent.test.ts
index be335eee..a65af4dc 100644
--- a/app/models/tenure/FairholdLandRent.test.ts
+++ b/app/models/tenure/FairholdLandRent.test.ts
@@ -1,10 +1,16 @@
 import { Fairhold } from "../Fairhold";
 import { DEFAULT_FORECAST_PARAMETERS, ForecastParameters } from "../ForecastParameters";
 import { FairholdLandRent } from "./FairholdLandRent";
+import { MarketPurchase } from "./MarketPurchase"
 
 let tenureFairholdLandRent: FairholdLandRent;
 
 beforeEach(() => {
+    // partial MarketPurchase object with only necessary properties for test (instead of mocking a whole MarketPurchase object)
+    const partialMarketPurchase: Pick<MarketPurchase, 'interestPaid'> = {
+      interestPaid: 200000, 
+    };
+
   const forecastParameters: ForecastParameters = {
     ...DEFAULT_FORECAST_PARAMETERS,
   };
@@ -22,7 +28,8 @@ beforeEach(() => {
       landPriceOrRent: 20000,
     }),
     forecastParameters: forecastParameters,
-  });
+    marketPurchase: partialMarketPurchase as MarketPurchase
+  })
 });
 
 it("can be instantiated", () => {
diff --git a/app/models/tenure/FairholdLandRent.ts b/app/models/tenure/FairholdLandRent.ts
index 6fd05837..985ce515 100644
--- a/app/models/tenure/FairholdLandRent.ts
+++ b/app/models/tenure/FairholdLandRent.ts
@@ -2,6 +2,7 @@ import { MONTHS_PER_YEAR } from "../constants";
 import { Fairhold } from "../Fairhold";
 import { Mortgage } from "../Mortgage";
 import { ForecastParameters } from '../ForecastParameters'; 
+import { MarketPurchase } from "./MarketPurchase";
 
 interface FairholdLandRentParams {
   averageRentYearly: number;
@@ -12,6 +13,7 @@ interface FairholdLandRentParams {
   incomeYearly: number;
   fairhold: Fairhold;
   forecastParameters: ForecastParameters;
+  marketPurchase: MarketPurchase;
 }
 
 export class FairholdLandRent {
@@ -20,6 +22,9 @@ export class FairholdLandRent {
   depreciatedHouseMortgage: Mortgage;
   /** discounted value of the monthly land rent according to fairhold */
   discountedLandRentMonthly: number;
+  interestPaid: number;
+  /** interest saved relative to market purchase, pounds */
+  interestSaved: number;
 
   constructor(params: FairholdLandRentParams) {
     this.params = params;
@@ -29,6 +34,12 @@ export class FairholdLandRent {
 
     this.discountedLandRentMonthly =
       this.calculateDiscountedLandRentMonthly(params);
+
+    this.interestPaid = 
+      this.calculateInterestPaid();
+
+    this.interestSaved = 
+      this.calculateInterestSaved(params.marketPurchase);
   }
 
   private calculateDiscountedLandRentMonthly({
@@ -51,4 +62,12 @@ export class FairholdLandRent {
 
     return discountedLandRentMonthly;
   }
+
+  private calculateInterestPaid() {
+    return this.depreciatedHouseMortgage.totalInterest;
+  }
+
+  private calculateInterestSaved(marketPurchase: MarketPurchase): number {
+    return marketPurchase.interestPaid - this.interestPaid;
+  }
 }
diff --git a/app/models/tenure/MarketPurchase.ts b/app/models/tenure/MarketPurchase.ts
index e5a0864c..828c4414 100644
--- a/app/models/tenure/MarketPurchase.ts
+++ b/app/models/tenure/MarketPurchase.ts
@@ -16,6 +16,7 @@ export class MarketPurchase {
   public affordability: number;
   public houseMortgage: Mortgage;
   public landMortgage: Mortgage;
+  public interestPaid: number;
 
   constructor(params: MarketPurchaseParams) {
     this.params = params;
@@ -32,6 +33,8 @@ export class MarketPurchase {
     });
 
     this.affordability = this.calculateAffordability(params);
+
+    this.interestPaid = this.calculateInterestPaid();
   }
 
   private calculateAffordability({ incomeYearly }: MarketPurchaseParams) {
@@ -42,4 +45,8 @@ export class MarketPurchase {
     return affordability;
   }
 
+  private calculateInterestPaid() {
+    return this.houseMortgage.totalInterest + this.landMortgage.totalInterest
+  }
+
 }