diff --git a/packages/dai-plugin-mcd/src/SystemDataService.js b/packages/dai-plugin-mcd/src/SystemDataService.js
index 3842ec903..f02f0eb17 100644
--- a/packages/dai-plugin-mcd/src/SystemDataService.js
+++ b/packages/dai-plugin-mcd/src/SystemDataService.js
@@ -43,6 +43,10 @@ export default class SystemDataService extends PublicService {
     return DAI.rad(dai).minus(DAI.rad(sin));
   }
 
+  async getTotalDai() {
+    return DAI.rad(await this.vat.debt());
+  }
+
   // Helpers ----------------------------------------------
 
   get cat() {
diff --git a/packages/dai-plugin-mcd/test/SystemDataService.spec.js b/packages/dai-plugin-mcd/test/SystemDataService.spec.js
index 0928f7b00..011885e86 100644
--- a/packages/dai-plugin-mcd/test/SystemDataService.spec.js
+++ b/packages/dai-plugin-mcd/test/SystemDataService.spec.js
@@ -1,13 +1,19 @@
-import { mcdMaker } from './helpers';
+import { takeSnapshot, restoreSnapshot } from '@makerdao/test-helpers';
+
+import { mcdMaker, setupCollateral } from './helpers';
 import { ServiceRoles } from '../src/constants';
-import { DAI } from '../src/index';
+import { DAI, ETH } from '../src/index';
 
-let service;
-let maker;
+let service, snapshotData, maker;
 
 beforeAll(async () => {
   maker = await mcdMaker();
   service = maker.service(ServiceRoles.SYSTEM_DATA);
+  snapshotData = await takeSnapshot(maker);
+});
+
+afterAll(async () => {
+  await restoreSnapshot(snapshotData, maker);
 });
 
 test('get annual base rate', async () => {
@@ -29,3 +35,12 @@ test('get system surplus', async () => {
   const surplus = await service.getSystemSurplus();
   expect(surplus).toEqual(DAI(0)); //TODO change to expect non-zero number
 });
+
+test('get total dai', async () => {
+  expect((await service.getTotalDai()).toNumber()).toEqual(DAI(0).toNumber());
+  await setupCollateral(maker, 'ETH-A', { price: 150, debtCeiling: 50 });
+  await maker
+    .service(ServiceRoles.CDP_MANAGER)
+    .openLockAndDraw('ETH-A', ETH(1), DAI(3));
+  expect((await service.getTotalDai()).toNumber()).toBe(DAI(3).toNumber());
+});