feat(pricing): drop flat fee, add 19% German VAT

src/lib/pricing.js

@@ -12,17 +12,18 @@ export const VM_PRICING_EUR = {
 };
 
 export const DISK_PRICE_PER_GB_EUR = 0.04;
-export const MANAGEMENT_COST_EUR = 3.00;
 export const MARGIN_MULTIPLIER = 1.5;
+export const VAT_MULTIPLIER = 1.19;
 
 export function computeMonthlyPrice(vmSize, volumeSizeGb) {
   if (!vmSize) return null;
   const vmCost = VM_PRICING_EUR[vmSize];
   if (vmCost === undefined) return null;
   if (!Number.isFinite(volumeSizeGb)) return null;
   const total =
-    (vmCost + volumeSizeGb * DISK_PRICE_PER_GB_EUR + MANAGEMENT_COST_EUR) *
-    MARGIN_MULTIPLIER;
+    (vmCost + volumeSizeGb * DISK_PRICE_PER_GB_EUR) *
+    MARGIN_MULTIPLIER *
+    VAT_MULTIPLIER;
   return Math.round(total * 100) / 100;
 }
 
@@ -35,3 +36,10 @@ export function centsToEur(cents) {
   if (cents == null) return null;
   return Math.round(cents) / 100;
 }
+
+// VAT share of a gross price (gross already includes 19% VAT), in euros.
+export function vatAmountEur(grossCents) {
+  if (grossCents == null) return null;
+  const net = Math.round(grossCents / VAT_MULTIPLIER);
+  return (grossCents - net) / 100;
+}

src/views/Settings.vue

@@ -59,10 +59,13 @@
 
               <!-- Active / Active+pending -->
               <template v-else-if="subscriptionState === 'active' || subscriptionState === 'active-pending'">
-                <b-card-text>
+                <b-card-text class="mb-1">
                   Plan: <b>{{ $store.state.profile.vm_size | uppercase }}</b>
                   — {{ formatPrice(centsToEur($store.state.profile.subscription.price_cents)) }}/month
                 </b-card-text>
+                <b-card-text class="text-muted small">
+                  incl. 19% VAT ({{ formatPrice(vatAmountEur($store.state.profile.subscription.price_cents)) }})
+                </b-card-text>
                 <b-card-text v-if="$store.state.profile.subscription.next_billing_date">
                   Next charge {{ $store.state.profile.subscription.next_billing_date | formatDateHumanize }}.
                 </b-card-text>
@@ -76,7 +79,10 @@
                   Upgrade pending:
                   <b>{{ $store.state.profile.subscription.pending_vm_size | uppercase }}</b>
                   at
-                  {{ formatPrice(centsToEur($store.state.profile.subscription.pending_price_cents)) }}/month.
+                  {{ formatPrice(centsToEur($store.state.profile.subscription.pending_price_cents)) }}/month
+                  <span class="text-muted small">
+                    (incl. 19% VAT {{ formatPrice(vatAmountEur($store.state.profile.subscription.pending_price_cents)) }})
+                  </span>.
                 </b-alert>
                 <b-button
                     variant="outline-primary"
@@ -323,7 +329,7 @@ import TextField from "@/components/TextField.vue";
 import {toastMixin} from "@/mixins";
 import pjson from "@/../package.json";
 import {EventBus} from "@/event-bus";
-import {centsToEur, formatPrice} from "@/lib/pricing";
+import {centsToEur, formatPrice, vatAmountEur} from "@/lib/pricing";
 import {loadPaypalSdk} from "@/lib/paypal-sdk";
 
 const INTERSTITIAL_POLL_MS = 3000;
@@ -683,6 +689,7 @@ export default {
     },
     centsToEur,
     formatPrice,
+    vatAmountEur,
   },
 
   async mounted() {

tests/unit/pricing.spec.js

@@ -2,27 +2,28 @@ import {
   centsToEur,
   computeMonthlyPrice,
   formatPrice,
+  vatAmountEur,
 } from '@/lib/pricing';
 
 describe('computeMonthlyPrice', () => {
-  // (11.00 + 30*0.04 + 3.00) * 1.5 = 22.80
-  test('s + 30GB => 22.80', () => {
-    expect(computeMonthlyPrice('s', 30)).toBe(22.80);
+  // (11.00 + 30*0.04) * 1.5 * 1.19 = 21.78
+  test('s + 30GB => 21.78', () => {
+    expect(computeMonthlyPrice('s', 30)).toBe(21.78);
   });
 
-  // (5.50 + 20*0.04 + 3.00) * 1.5 = 13.95
-  test('xs + 20GB => 13.95', () => {
-    expect(computeMonthlyPrice('xs', 20)).toBe(13.95);
+  // (5.50 + 20*0.04) * 1.5 * 1.19 = 11.25
+  test('xs + 20GB => 11.25', () => {
+    expect(computeMonthlyPrice('xs', 20)).toBe(11.25);
   });
 
-  // (102.00 + 400*0.04 + 3.00) * 1.5 = 181.50
-  test('xl + 400GB => 181.50', () => {
-    expect(computeMonthlyPrice('xl', 400)).toBe(181.50);
+  // (102.00 + 400*0.04) * 1.5 * 1.19 = 210.63
+  test('xl + 400GB => 210.63', () => {
+    expect(computeMonthlyPrice('xl', 400)).toBe(210.63);
   });
 
-  // (19.80 + 250*0.04 + 3.00) * 1.5 = 49.20
-  test('m + 250GB => 49.20', () => {
-    expect(computeMonthlyPrice('m', 250)).toBe(49.20);
+  // (19.80 + 250*0.04) * 1.5 * 1.19 = 53.19
+  test('m + 250GB => 53.19', () => {
+    expect(computeMonthlyPrice('m', 250)).toBe(53.19);
   });
 
   test('missing vmSize => null', () => {
@@ -53,3 +54,19 @@ describe('centsToEur', () => {
     expect(centsToEur(2130)).toBe(21.30);
   });
 });
+
+describe('vatAmountEur', () => {
+  // VAT share of a gross price: gross - round(gross/1.19)
+  test('s + 30GB gross 2178c => 3.48', () => {
+    expect(vatAmountEur(2178)).toBe(3.48);
+  });
+  test('m + 100GB gross 4248c => 6.78', () => {
+    expect(vatAmountEur(4248)).toBe(6.78);
+  });
+  test('xl + 400GB gross 21063c => 33.63', () => {
+    expect(vatAmountEur(21063)).toBe(33.63);
+  });
+  test('null => null', () => {
+    expect(vatAmountEur(null)).toBeNull();
+  });
+});