diff --git a/README.md b/README.md
index e809929..07656c3 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,7 @@ product, niet als medisch hulpmiddel. Release 1 blijft smal:
 - e-mail/wachtwoord-auth via Supabase
 - protected dashboard met server-side sessiecontrole
 - ochtendcheck-in voor energiescore en slaapkwaliteit van vandaag
+- eenvoudig dagbudget en energieniveau op basis van de ochtendscore
 - korte onboardingflow voor eerste voorkeuren
 - instellingen voor taal, timezone, reminders en zichtbaarheid van energiepunten
 - `shadcn/ui` foundation voor knoppen, formulieren, kaarten en meldingen
diff --git a/app/check-in/page.tsx b/app/check-in/page.tsx
index 484352b..ac869ce 100644
--- a/app/check-in/page.tsx
+++ b/app/check-in/page.tsx
@@ -13,6 +13,7 @@ import {
 } from "@/components/ui/card";
 import { sanitizeNextPath } from "@/lib/auth/navigation";
 import { getAuthState } from "@/lib/auth/session";
+import { formatEnergyLevelLabel } from "@/lib/check-in/budget";
 import { getTodayCheckInForCurrentUser } from "@/lib/check-in/service";
 import { getCheckInStatusToast } from "@/lib/feedback/status-messages";
 import { getProfileBundleForCurrentUser } from "@/lib/profile/service";
@@ -108,10 +109,17 @@ export default async function CheckInPage({ searchParams }: CheckInPageProps) {
                 </CardTitle>
               </CardHeader>
               <CardContent className="pb-6">
-                <CardDescription className="text-sm leading-7 text-muted-foreground">
-                  Lokale datum: {checkInStatus?.todayDate ?? "Onbekend"} in timezone{" "}
+              <CardDescription className="text-sm leading-7 text-muted-foreground">
+                Lokale datum: {checkInStatus?.todayDate ?? "Onbekend"} in timezone{" "}
                   `{profileBundle.profile.timezone}`.
                 </CardDescription>
+                {checkInStatus?.todayCheckIn ? (
+                  <CardDescription className="mt-3 text-sm leading-7 text-muted-foreground">
+                    Laatste resultaat: niveau{" "}
+                    {formatEnergyLevelLabel(checkInStatus.todayCheckIn.energyLevel).toLowerCase()} met een budget van{" "}
+                    {checkInStatus.todayCheckIn.dailyBudget} punten.
+                  </CardDescription>
+                ) : null}
               </CardContent>
             </Card>
 
@@ -124,7 +132,7 @@ export default async function CheckInPage({ searchParams }: CheckInPageProps) {
               <CardContent className="space-y-3 pb-6 text-sm leading-7 text-primary-foreground/90">
                 <p>Deze check-in geeft geen diagnose of medische interpretatie.</p>
                 <p>Je legt alleen een rustige momentopname van vandaag vast.</p>
-                <p>De budgetlogica volgt pas in de volgende story.</p>
+                <p>Budget v1 blijft bewust eenvoudig: het dagbudget volgt direct uit je energiescore.</p>
               </CardContent>
             </Card>
           </aside>
diff --git a/components/check-in/check-in-card.tsx b/components/check-in/check-in-card.tsx
index b815b59..c8ffb2b 100644
--- a/components/check-in/check-in-card.tsx
+++ b/components/check-in/check-in-card.tsx
@@ -7,6 +7,7 @@ import {
   CardHeader,
   CardTitle,
 } from "@/components/ui/card";
+import { formatEnergyLevelLabel } from "@/lib/check-in/budget";
 import type { MorningCheckInRecord } from "@/lib/check-in/types";
 import { cn } from "@/lib/utils";
 
@@ -29,7 +30,7 @@ function formatSleepQualityLabel(value: MorningCheckInRecord["sleepQuality"]) {
 export function CheckInCard({ todayCheckIn }: CheckInCardProps) {
   const title = todayCheckIn ? "Vandaag ingevuld" : "Nog niet ingevuld";
   const description = todayCheckIn
-    ? `Energie ${todayCheckIn.energyScore}/10, slaap ${formatSleepQualityLabel(todayCheckIn.sleepQuality).toLowerCase()}.`
+    ? `Energie ${todayCheckIn.energyScore}/10, slaap ${formatSleepQualityLabel(todayCheckIn.sleepQuality).toLowerCase()}, niveau ${formatEnergyLevelLabel(todayCheckIn.energyLevel).toLowerCase()}, budget ${todayCheckIn.dailyBudget} punten.`
     : "Leg je energiestart en slaapkwaliteit van vandaag vast.";
 
   return (
diff --git a/components/check-in/check-in-form.tsx b/components/check-in/check-in-form.tsx
index c27d1f6..a5ece0a 100644
--- a/components/check-in/check-in-form.tsx
+++ b/components/check-in/check-in-form.tsx
@@ -12,6 +12,10 @@ import {
 } from "@/components/ui/card";
 import { Label } from "@/components/ui/label";
 import { Separator } from "@/components/ui/separator";
+import {
+  deriveBudgetSnapshot,
+  formatEnergyLevelLabel,
+} from "@/lib/check-in/budget";
 import { ENERGY_SCORE_VALUES, SLEEP_QUALITY_OPTIONS } from "@/lib/check-in/options";
 import type {
   MorningCheckInRecord,
@@ -47,6 +51,7 @@ export function CheckInForm({ todayCheckIn }: CheckInFormProps) {
   const [sleepQuality, setSleepQuality] = useState<SleepQuality | null>(
     todayCheckIn?.sleepQuality ?? null,
   );
+  const predictedBudget = energyScore === null ? null : deriveBudgetSnapshot(energyScore);
 
   return (
     <form action={formAction} className="space-y-6" aria-busy={isPending}>
@@ -75,6 +80,12 @@ export function CheckInForm({ todayCheckIn }: CheckInFormProps) {
               <p className="text-sm leading-7 text-muted-foreground">
                 {getEnergyScorePrompt(energyScore)}
               </p>
+              {predictedBudget ? (
+                <p className="text-sm leading-7 text-slate-700">
+                  Voor vandaag geeft dit niveau <strong>{formatEnergyLevelLabel(predictedBudget.energyLevel).toLowerCase()}</strong> en een startbudget van{" "}
+                  <strong>{predictedBudget.dailyBudget} punten</strong>.
+                </p>
+              ) : null}
             </div>
 
             <div className="grid grid-cols-5 gap-2 sm:grid-cols-10">
@@ -156,7 +167,7 @@ export function CheckInForm({ todayCheckIn }: CheckInFormProps) {
           {isPending
             ? "Je ochtendcheck-in wordt opgeslagen..."
             : todayCheckIn
-              ? "Je kunt de check-in van vandaag nog aanpassen."
+              ? "Je kunt de check-in van vandaag nog aanpassen. Budget en niveau worden dan opnieuw afgeleid."
               : "Je vult voor vandaag één check-in in, die je later nog kunt aanpassen."}
         </p>
 
diff --git a/lib/check-in/budget.test.ts b/lib/check-in/budget.test.ts
new file mode 100644
index 0000000..c61e36a
--- /dev/null
+++ b/lib/check-in/budget.test.ts
@@ -0,0 +1,60 @@
+import { describe, expect, it } from "vitest";
+import {
+  BUDGET_FORMULA_VERSION,
+  deriveBudgetSnapshot,
+  deriveDailyBudget,
+  deriveEnergyLevel,
+  formatEnergyLevelLabel,
+} from "./budget";
+
+describe("deriveEnergyLevel", () => {
+  it("maps scores 1 and 2 to zeer_laag", () => {
+    expect(deriveEnergyLevel(1)).toBe("zeer_laag");
+    expect(deriveEnergyLevel(2)).toBe("zeer_laag");
+  });
+
+  it("maps scores 3 and 4 to laag", () => {
+    expect(deriveEnergyLevel(3)).toBe("laag");
+    expect(deriveEnergyLevel(4)).toBe("laag");
+  });
+
+  it("maps scores 5 and 6 to midden", () => {
+    expect(deriveEnergyLevel(5)).toBe("midden");
+    expect(deriveEnergyLevel(6)).toBe("midden");
+  });
+
+  it("maps scores 7 and 8 to redelijk", () => {
+    expect(deriveEnergyLevel(7)).toBe("redelijk");
+    expect(deriveEnergyLevel(8)).toBe("redelijk");
+  });
+
+  it("maps scores 9 and 10 to hoog", () => {
+    expect(deriveEnergyLevel(9)).toBe("hoog");
+    expect(deriveEnergyLevel(10)).toBe("hoog");
+  });
+});
+
+describe("deriveDailyBudget", () => {
+  it("keeps v1 daily budget equal to the energy score", () => {
+    expect(deriveDailyBudget(1)).toBe(1);
+    expect(deriveDailyBudget(5)).toBe(5);
+    expect(deriveDailyBudget(10)).toBe(10);
+  });
+});
+
+describe("deriveBudgetSnapshot", () => {
+  it("returns a stable snapshot with formula version", () => {
+    expect(deriveBudgetSnapshot(6)).toEqual({
+      energyLevel: "midden",
+      dailyBudget: 6,
+      budgetFormulaVersion: BUDGET_FORMULA_VERSION,
+    });
+  });
+});
+
+describe("formatEnergyLevelLabel", () => {
+  it("returns readable Dutch labels", () => {
+    expect(formatEnergyLevelLabel("zeer_laag")).toBe("Zeer laag");
+    expect(formatEnergyLevelLabel("redelijk")).toBe("Redelijk");
+  });
+});
diff --git a/lib/check-in/budget.ts b/lib/check-in/budget.ts
new file mode 100644
index 0000000..42a4d8f
--- /dev/null
+++ b/lib/check-in/budget.ts
@@ -0,0 +1,56 @@
+import type { EnergyLevel } from "@/lib/check-in/types";
+
+export const BUDGET_FORMULA_VERSION = 1;
+
+export type BudgetSnapshot = {
+  energyLevel: EnergyLevel;
+  dailyBudget: number;
+  budgetFormulaVersion: number;
+};
+
+export function deriveEnergyLevel(energyScore: number): EnergyLevel {
+  if (energyScore <= 2) {
+    return "zeer_laag";
+  }
+
+  if (energyScore <= 4) {
+    return "laag";
+  }
+
+  if (energyScore <= 6) {
+    return "midden";
+  }
+
+  if (energyScore <= 8) {
+    return "redelijk";
+  }
+
+  return "hoog";
+}
+
+export function deriveDailyBudget(energyScore: number): number {
+  return energyScore;
+}
+
+export function deriveBudgetSnapshot(energyScore: number): BudgetSnapshot {
+  return {
+    energyLevel: deriveEnergyLevel(energyScore),
+    dailyBudget: deriveDailyBudget(energyScore),
+    budgetFormulaVersion: BUDGET_FORMULA_VERSION,
+  };
+}
+
+export function formatEnergyLevelLabel(energyLevel: EnergyLevel): string {
+  switch (energyLevel) {
+    case "zeer_laag":
+      return "Zeer laag";
+    case "laag":
+      return "Laag";
+    case "midden":
+      return "Midden";
+    case "redelijk":
+      return "Redelijk";
+    case "hoog":
+      return "Hoog";
+  }
+}
diff --git a/lib/check-in/service.ts b/lib/check-in/service.ts
index 99c7489..4fda3aa 100644
--- a/lib/check-in/service.ts
+++ b/lib/check-in/service.ts
@@ -1,7 +1,9 @@
 import { getAuthenticatedUser } from "@/lib/auth/session";
+import { deriveBudgetSnapshot } from "@/lib/check-in/budget";
 import { ensureProfileBundleForCurrentUser } from "@/lib/profile/service";
 import { createClient } from "@/lib/supabase/server";
 import type {
+  EnergyLevel,
   MorningCheckInRecord,
   MorningCheckInStatus,
   MorningCheckInSubmission,
@@ -16,6 +18,9 @@ type MorningCheckInRow = {
   check_in_date: string;
   energy_score: number;
   sleep_quality: SleepQuality;
+  energy_level: EnergyLevel;
+  daily_budget: number;
+  budget_formula_version: number;
   created_at: string;
   updated_at: string;
 };
@@ -25,10 +30,13 @@ type MorningCheckInInsert = {
   check_in_date: string;
   energy_score: number;
   sleep_quality: SleepQuality;
+  energy_level: EnergyLevel;
+  daily_budget: number;
+  budget_formula_version: number;
 };
 
 const MORNING_CHECK_IN_COLUMNS =
-  "id, user_id, check_in_date, energy_score, sleep_quality, created_at, updated_at";
+  "id, user_id, check_in_date, energy_score, sleep_quality, energy_level, daily_budget, budget_formula_version, created_at, updated_at";
 
 function mapMorningCheckInRow(row: MorningCheckInRow): MorningCheckInRecord {
   return {
@@ -37,6 +45,9 @@ function mapMorningCheckInRow(row: MorningCheckInRow): MorningCheckInRecord {
     checkInDate: row.check_in_date,
     energyScore: row.energy_score,
     sleepQuality: row.sleep_quality,
+    energyLevel: row.energy_level,
+    dailyBudget: row.daily_budget,
+    budgetFormulaVersion: row.budget_formula_version,
     createdAt: row.created_at,
     updatedAt: row.updated_at,
   };
@@ -122,11 +133,15 @@ export async function upsertTodayCheckInForCurrentUser(
   }
 
   const checkInDate = getLocalDateForTimezone(profileBundle.profile.timezone);
+  const budgetSnapshot = deriveBudgetSnapshot(submission.energyScore);
   const payload: MorningCheckInInsert = {
     user_id: user.id,
     check_in_date: checkInDate,
     energy_score: submission.energyScore,
     sleep_quality: submission.sleepQuality,
+    energy_level: budgetSnapshot.energyLevel,
+    daily_budget: budgetSnapshot.dailyBudget,
+    budget_formula_version: budgetSnapshot.budgetFormulaVersion,
   };
 
   const supabase = await createClient();
diff --git a/lib/check-in/types.ts b/lib/check-in/types.ts
index 10f6b56..506e302 100644
--- a/lib/check-in/types.ts
+++ b/lib/check-in/types.ts
@@ -1,4 +1,5 @@
 export type SleepQuality = "goed" | "matig" | "slecht";
+export type EnergyLevel = "zeer_laag" | "laag" | "midden" | "redelijk" | "hoog";
 
 export type MorningCheckInRecord = {
   id: string;
@@ -6,6 +7,9 @@ export type MorningCheckInRecord = {
   checkInDate: string;
   energyScore: number;
   sleepQuality: SleepQuality;
+  energyLevel: EnergyLevel;
+  dailyBudget: number;
+  budgetFormulaVersion: number;
   createdAt: string;
   updatedAt: string;
 };
diff --git a/package-lock.json b/package-lock.json
index fc39f3d..63fcb42 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -32,7 +32,8 @@
         "eslint-config-next": "16.2.0",
         "postcss": "latest",
         "tailwindcss": "latest",
-        "typescript": "latest"
+        "typescript": "latest",
+        "vitest": "^4.1.4"
       },
       "engines": {
         "node": ">=20.9.0"
@@ -2017,6 +2018,340 @@
       "integrity": "sha512-U69T3ItWHvLwGg5eJ0n3I62nWuE6ilHlmz7zM0npLBRvPRd7e6NYmg54vvRtP5mZG7kZqZCFVdsTWo7BPtBujg==",
       "license": "MIT"
     },
+    "node_modules/@oxc-project/types": {
+      "version": "0.124.0",
+      "resolved": "https://registry.npmjs.org/@oxc-project/types/-/types-0.124.0.tgz",
+      "integrity": "sha512-VBFWMTBvHxS11Z5Lvlr3IWgrwhMTXV+Md+EQF0Xf60+wAdsGFTBx7X7K/hP4pi8N7dcm1RvcHwDxZ16Qx8keUg==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/Boshen"
+      }
+    },
+    "node_modules/@rolldown/binding-android-arm64": {
+      "version": "1.0.0-rc.15",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-android-arm64/-/binding-android-arm64-1.0.0-rc.15.tgz",
+      "integrity": "sha512-YYe6aWruPZDtHNpwu7+qAHEMbQ/yRl6atqb/AhznLTnD3UY99Q1jE7ihLSahNWkF4EqRPVC4SiR4O0UkLK02tA==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@rolldown/binding-darwin-arm64": {
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+      "resolved": "https://registry.npmjs.org/@rolldown/binding-darwin-arm64/-/binding-darwin-arm64-1.0.0-rc.15.tgz",
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+        "arm64"
+      ],
+      "dev": true,
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+      "os": [
+        "darwin"
+      ],
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+      }
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+        "x64"
+      ],
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+      ],
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+      }
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+      "resolved": "https://registry.npmjs.org/@rolldown/binding-freebsd-x64/-/binding-freebsd-x64-1.0.0-rc.15.tgz",
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+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "freebsd"
+      ],
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+      }
+    },
+    "node_modules/@rolldown/binding-linux-arm-gnueabihf": {
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+        "arm"
+      ],
+      "dev": true,
+      "license": "MIT",
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+      }
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+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "libc": [
+        "glibc"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
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+      }
+    },
+    "node_modules/@rolldown/binding-linux-arm64-musl": {
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+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "libc": [
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+      "license": "MIT",
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+        "ppc64"
+      ],
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+      "libc": [
+        "glibc"
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+      ],
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+    "node_modules/@rolldown/binding-linux-s390x-gnu": {
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+      "cpu": [
+        "s390x"
+      ],
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+      "libc": [
+        "glibc"
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+        "glibc"
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+        "x64"
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+        "@rolldown/binding-wasm32-wasi": "1.0.0-rc.15",
+        "@rolldown/binding-win32-arm64-msvc": "1.0.0-rc.15",
+        "@rolldown/binding-win32-x64-msvc": "1.0.0-rc.15"
+      }
+    },
     "node_modules/router": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/router/-/router-2.2.0.tgz",
@@ -8809,6 +9396,13 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/siginfo": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/siginfo/-/siginfo-2.0.0.tgz",
+      "integrity": "sha512-ybx0WO1/8bSBLEWXZvEd7gMW3Sn3JFlW3TvX1nREbDLRNQNaeNN8WK0meBwPdAaOI7TtRRRJn/Es1zhrrCHu7g==",
+      "dev": true,
+      "license": "ISC"
+    },
     "node_modules/signal-exit": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-4.1.0.tgz",
@@ -8862,6 +9456,13 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/stackback": {
+      "version": "0.0.2",
+      "resolved": "https://registry.npmjs.org/stackback/-/stackback-0.0.2.tgz",
+      "integrity": "sha512-1XMJE5fQo1jGH6Y/7ebnwPOBEkIEnT4QF32d5R1+VXdXveM0IBMJt8zfaxX1P3QhVwrYe+576+jkANtSS2mBbw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/statuses": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.2.tgz",
@@ -8871,6 +9472,13 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/std-env": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/std-env/-/std-env-4.1.0.tgz",
+      "integrity": "sha512-Rq7ybcX2RuC55r9oaPVEW7/xu3tj8u4GeBYHBWCychFtzMIr86A7e3PPEBPT37sHStKX3+TiX/Fr/ACmJLVlLQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/stdin-discarder": {
       "version": "0.2.2",
       "resolved": "https://registry.npmjs.org/stdin-discarder/-/stdin-discarder-0.2.2.tgz",
@@ -9203,6 +9811,23 @@
       "integrity": "sha512-+FbBPE1o9QAYvviau/qC5SE3caw21q3xkvWKBtja5vgqOWIHHJ3ioaq1VPfn/Szqctz2bU/oYeKd9/z5BL+PVg==",
       "license": "MIT"
     },
+    "node_modules/tinybench": {
+      "version": "2.9.0",
+      "resolved": "https://registry.npmjs.org/tinybench/-/tinybench-2.9.0.tgz",
+      "integrity": "sha512-0+DUvqWMValLmha6lr4kD8iAMK1HzV0/aKnCtWb9v9641TnP/MFb7Pc2bxoxQjTXAErryXVgUOfv2YqNllqGeg==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/tinyexec": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/tinyexec/-/tinyexec-1.1.1.tgz",
+      "integrity": "sha512-VKS/ZaQhhkKFMANmAOhhXVoIfBXblQxGX1myCQ2faQrfmobMftXeJPcZGp0gS07ocvGJWDLZGyOZDadDBqYIJg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/tinyglobby": {
       "version": "0.2.16",
       "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.16.tgz",
@@ -9251,6 +9876,16 @@
         "url": "https://github.com/sponsors/jonschlinkert"
       }
     },
+    "node_modules/tinyrainbow": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/tinyrainbow/-/tinyrainbow-3.1.0.tgz",
+      "integrity": "sha512-Bf+ILmBgretUrdJxzXM0SgXLZ3XfiaUuOj/IKQHuTXip+05Xn+uyEYdVg0kYDipTBcLrCVyUzAPz7QmArb0mmw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=14.0.0"
+      }
+    },
     "node_modules/tldts": {
       "version": "7.0.28",
       "resolved": "https://registry.npmjs.org/tldts/-/tldts-7.0.28.tgz",
@@ -9696,6 +10331,200 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/vite": {
+      "version": "8.0.8",
+      "resolved": "https://registry.npmjs.org/vite/-/vite-8.0.8.tgz",
+      "integrity": "sha512-dbU7/iLVa8KZALJyLOBOQ88nOXtNG8vxKuOT4I2mD+Ya70KPceF4IAmDsmU0h1Qsn5bPrvsY9HJstCRh3hG6Uw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "lightningcss": "^1.32.0",
+        "picomatch": "^4.0.4",
+        "postcss": "^8.5.8",
+        "rolldown": "1.0.0-rc.15",
+        "tinyglobby": "^0.2.15"
+      },
+      "bin": {
+        "vite": "bin/vite.js"
+      },
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      },
+      "funding": {
+        "url": "https://github.com/vitejs/vite?sponsor=1"
+      },
+      "optionalDependencies": {
+        "fsevents": "~2.3.3"
+      },
+      "peerDependencies": {
+        "@types/node": "^20.19.0 || >=22.12.0",
+        "@vitejs/devtools": "^0.1.0",
+        "esbuild": "^0.27.0 || ^0.28.0",
+        "jiti": ">=1.21.0",
+        "less": "^4.0.0",
+        "sass": "^1.70.0",
+        "sass-embedded": "^1.70.0",
+        "stylus": ">=0.54.8",
+        "sugarss": "^5.0.0",
+        "terser": "^5.16.0",
+        "tsx": "^4.8.1",
+        "yaml": "^2.4.2"
+      },
+      "peerDependenciesMeta": {
+        "@types/node": {
+          "optional": true
+        },
+        "@vitejs/devtools": {
+          "optional": true
+        },
+        "esbuild": {
+          "optional": true
+        },
+        "jiti": {
+          "optional": true
+        },
+        "less": {
+          "optional": true
+        },
+        "sass": {
+          "optional": true
+        },
+        "sass-embedded": {
+          "optional": true
+        },
+        "stylus": {
+          "optional": true
+        },
+        "sugarss": {
+          "optional": true
+        },
+        "terser": {
+          "optional": true
+        },
+        "tsx": {
+          "optional": true
+        },
+        "yaml": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/vite/node_modules/picomatch": {
+      "version": "4.0.4",
+      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.4.tgz",
+      "integrity": "sha512-QP88BAKvMam/3NxH6vj2o21R6MjxZUAd6nlwAS/pnGvN9IVLocLHxGYIzFhg6fUQ+5th6P4dv4eW9jX3DSIj7A==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/jonschlinkert"
+      }
+    },
+    "node_modules/vitest": {
+      "version": "4.1.4",
+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-4.1.4.tgz",
+      "integrity": "sha512-tFuJqTxKb8AvfyqMfnavXdzfy3h3sWZRWwfluGbkeR7n0HUev+FmNgZ8SDrRBTVrVCjgH5cA21qGbCffMNtWvg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@vitest/expect": "4.1.4",
+        "@vitest/mocker": "4.1.4",
+        "@vitest/pretty-format": "4.1.4",
+        "@vitest/runner": "4.1.4",
+        "@vitest/snapshot": "4.1.4",
+        "@vitest/spy": "4.1.4",
+        "@vitest/utils": "4.1.4",
+        "es-module-lexer": "^2.0.0",
+        "expect-type": "^1.3.0",
+        "magic-string": "^0.30.21",
+        "obug": "^2.1.1",
+        "pathe": "^2.0.3",
+        "picomatch": "^4.0.3",
+        "std-env": "^4.0.0-rc.1",
+        "tinybench": "^2.9.0",
+        "tinyexec": "^1.0.2",
+        "tinyglobby": "^0.2.15",
+        "tinyrainbow": "^3.1.0",
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0",
+        "why-is-node-running": "^2.3.0"
+      },
+      "bin": {
+        "vitest": "vitest.mjs"
+      },
+      "engines": {
+        "node": "^20.0.0 || ^22.0.0 || >=24.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@edge-runtime/vm": "*",
+        "@opentelemetry/api": "^1.9.0",
+        "@types/node": "^20.0.0 || ^22.0.0 || >=24.0.0",
+        "@vitest/browser-playwright": "4.1.4",
+        "@vitest/browser-preview": "4.1.4",
+        "@vitest/browser-webdriverio": "4.1.4",
+        "@vitest/coverage-istanbul": "4.1.4",
+        "@vitest/coverage-v8": "4.1.4",
+        "@vitest/ui": "4.1.4",
+        "happy-dom": "*",
+        "jsdom": "*",
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@edge-runtime/vm": {
+          "optional": true
+        },
+        "@opentelemetry/api": {
+          "optional": true
+        },
+        "@types/node": {
+          "optional": true
+        },
+        "@vitest/browser-playwright": {
+          "optional": true
+        },
+        "@vitest/browser-preview": {
+          "optional": true
+        },
+        "@vitest/browser-webdriverio": {
+          "optional": true
+        },
+        "@vitest/coverage-istanbul": {
+          "optional": true
+        },
+        "@vitest/coverage-v8": {
+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        },
+        "vite": {
+          "optional": false
+        }
+      }
+    },
+    "node_modules/vitest/node_modules/picomatch": {
+      "version": "4.0.4",
+      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.4.tgz",
+      "integrity": "sha512-QP88BAKvMam/3NxH6vj2o21R6MjxZUAd6nlwAS/pnGvN9IVLocLHxGYIzFhg6fUQ+5th6P4dv4eW9jX3DSIj7A==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/jonschlinkert"
+      }
+    },
     "node_modules/web-streams-polyfill": {
       "version": "3.3.3",
       "resolved": "https://registry.npmjs.org/web-streams-polyfill/-/web-streams-polyfill-3.3.3.tgz",
@@ -9809,6 +10638,23 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/why-is-node-running": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
+      "integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "siginfo": "^2.0.0",
+        "stackback": "0.0.2"
+      },
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/word-wrap": {
       "version": "1.2.5",
       "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.5.tgz",
diff --git a/package.json b/package.json
index 6a78528..706d99b 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,8 @@
     "dev": "next dev",
     "build": "next build --webpack",
     "start": "next start",
-    "lint": "eslint ."
+    "lint": "eslint .",
+    "test": "vitest run"
   },
   "dependencies": {
     "@base-ui/react": "^1.4.0",
@@ -33,7 +34,8 @@
     "eslint-config-next": "16.2.0",
     "postcss": "latest",
     "tailwindcss": "latest",
-    "typescript": "latest"
+    "typescript": "latest",
+    "vitest": "^4.1.4"
   },
   "engines": {
     "node": ">=20.9.0"
diff --git a/supabase/migrations/20260418_add_budget_fields_to_morning_check_ins.sql b/supabase/migrations/20260418_add_budget_fields_to_morning_check_ins.sql
new file mode 100644
index 0000000..795c17a
--- /dev/null
+++ b/supabase/migrations/20260418_add_budget_fields_to_morning_check_ins.sql
@@ -0,0 +1,44 @@
+alter table public.morning_check_ins
+add column if not exists energy_level text;
+
+alter table public.morning_check_ins
+add column if not exists daily_budget integer;
+
+alter table public.morning_check_ins
+add column if not exists budget_formula_version integer;
+
+update public.morning_check_ins
+set
+  energy_level = case
+    when energy_score between 1 and 2 then 'zeer_laag'
+    when energy_score between 3 and 4 then 'laag'
+    when energy_score between 5 and 6 then 'midden'
+    when energy_score between 7 and 8 then 'redelijk'
+    else 'hoog'
+  end,
+  daily_budget = energy_score,
+  budget_formula_version = 1
+where energy_level is null
+   or daily_budget is null
+   or budget_formula_version is null;
+
+alter table public.morning_check_ins
+alter column energy_level set not null;
+
+alter table public.morning_check_ins
+alter column daily_budget set not null;
+
+alter table public.morning_check_ins
+alter column budget_formula_version set not null;
+
+alter table public.morning_check_ins
+add constraint morning_check_ins_energy_level_check
+check (energy_level in ('zeer_laag', 'laag', 'midden', 'redelijk', 'hoog'));
+
+alter table public.morning_check_ins
+add constraint morning_check_ins_daily_budget_check
+check (daily_budget >= 1);
+
+alter table public.morning_check_ins
+add constraint morning_check_ins_budget_formula_version_check
+check (budget_formula_version >= 1);