diff --git a/src/components/MonthlyOverview.svelte b/src/components/MonthlyOverview.svelte
index 91feb3c..9ab864a 100644
--- a/src/components/MonthlyOverview.svelte
+++ b/src/components/MonthlyOverview.svelte
@@ -23,6 +23,7 @@
 {:else}
 	<p>No expenses found.</p>
 {/if}
+<a href="/expense">Add Expense</a>
 
 <h2>Income</h2>
 {#if data.income.length}
diff --git a/src/components/inputs/AmountInput.svelte b/src/components/inputs/AmountInput.svelte
new file mode 100644
index 0000000..4aa6ba9
--- /dev/null
+++ b/src/components/inputs/AmountInput.svelte
@@ -0,0 +1,17 @@
+<script>
+	export let amount = '';
+</script>
+
+<div>
+	<label for="amount">Amount</label>
+	<input
+		id="amount"
+		type="text"
+		name="amount"
+		inputmode="numeric"
+		pattern={'^(\\s{1,})?\\$?\\d{1,3}(,?\\d{3})*(\\.\\d{1,2})?(\\s{1,})?$'}
+		required
+		aria-required="true"
+		value={amount}
+	/>
+</div>
diff --git a/src/components/inputs/CategoryInput.svelte b/src/components/inputs/CategoryInput.svelte
new file mode 100644
index 0000000..f69d0c2
--- /dev/null
+++ b/src/components/inputs/CategoryInput.svelte
@@ -0,0 +1,47 @@
+<script>
+	export let categories = [];
+	export let selectedCategory;
+</script>
+
+<fieldset>
+	<legend>Category</legend>
+	<div>
+		<div>
+			<input
+				id="category__new"
+				type="radio"
+				name="category"
+				value="NEW_CATEGORY"
+				required
+				bind:group={selectedCategory}
+			/>
+			<label for="category__new">New Category</label>
+		</div>
+		{#each categories as { category }, index}
+			<div>
+				<input
+					id="category__{index}"
+					type="radio"
+					name="category"
+					value={category}
+					required
+					bind:group={selectedCategory}
+				/>
+				<label for="category__{index}">{category}</label>
+			</div>
+		{/each}
+	</div>
+</fieldset>
+{#if selectedCategory === 'NEW_CATEGORY'}
+	<div>
+		<label for="new-category">New Category</label>
+		<input
+			id="new-category"
+			type="text"
+			name="new-category"
+			required
+			aria-required="true"
+			autocapitalize="on"
+		/>
+	</div>
+{/if}
diff --git a/src/components/inputs/DateInputs.svelte b/src/components/inputs/DateInputs.svelte
new file mode 100644
index 0000000..ad7ade5
--- /dev/null
+++ b/src/components/inputs/DateInputs.svelte
@@ -0,0 +1,52 @@
+<script>
+	export let date = new Date();
+
+	const year = date.getFullYear();
+	const month = date.getMonth() + 1;
+	const day = date.getDate();
+</script>
+
+<fieldset>
+	<legend>Date</legend>
+	<div>
+		<div>
+			<label for="year">Year</label>
+			<input
+				id="year"
+				type="text"
+				name="year"
+				inputmode="numeric"
+				pattern="^[1-2][0-9][0-9][0-9]$"
+				required
+				aria-required="true"
+				value={year}
+			/>
+		</div>
+		<div>
+			<label for="month">Month</label>
+			<input
+				id="month"
+				type="text"
+				name="month"
+				inputmode="numeric"
+				pattern="^(0?[1-9]|1[012])$"
+				required
+				aria-required="true"
+				value={month}
+			/>
+		</div>
+		<div>
+			<label for="day">Day</label>
+			<input
+				id="day"
+				type="text"
+				name="day"
+				inputmode="numeric"
+				pattern="^(0?[1-9]|[12]\d|3[01])$"
+				required
+				aria-required="true"
+				value={day}
+			/>
+		</div>
+	</div>
+</fieldset>
diff --git a/src/components/inputs/DescriptionInput.svelte b/src/components/inputs/DescriptionInput.svelte
new file mode 100644
index 0000000..164afc3
--- /dev/null
+++ b/src/components/inputs/DescriptionInput.svelte
@@ -0,0 +1,8 @@
+<script>
+	export let description = '';
+</script>
+
+<div>
+	<label for="description">Description (optional)</label>
+	<input id="description" type="text" name="description" value={description} autocapitalize="on" />
+</div>
diff --git a/src/lib/format-inputs.js b/src/lib/format-inputs.js
new file mode 100644
index 0000000..1426e2d
--- /dev/null
+++ b/src/lib/format-inputs.js
@@ -0,0 +1,9 @@
+export const formatAmount = (value) => Number(value.toString().replace(/[^0-9|.]/g, ''));
+
+export const formatDate = (year, month, day) => {
+	const numericYear = Number(year);
+	const numericMonth = Number(month) - 1;
+	const numericDay = Number(day);
+
+	return new Date(numericYear, numericMonth, numericDay);
+};
diff --git a/src/routes/expense/+page.server.js b/src/routes/expense/+page.server.js
new file mode 100644
index 0000000..20241dc
--- /dev/null
+++ b/src/routes/expense/+page.server.js
@@ -0,0 +1,48 @@
+import { fail, redirect } from '@sveltejs/kit';
+import { formatAmount, formatDate } from '$lib/format-inputs.js';
+
+export const load = async ({ locals: { supabase } }) => {
+	try {
+		const { data: categories } = await supabase
+			.from('expense_categories')
+			.select('category')
+			.order('category');
+
+		return {
+			categories,
+		};
+	} catch (error) {
+		return fail(500, { message: 'Server error. Try again later.', success: false });
+	}
+};
+
+export const actions = {
+	default: async ({ request, locals: { supabase } }) => {
+		const formData = await request.formData();
+		const amount = formatAmount(formData.get('amount'));
+
+		const selectedCategory = formData.get('category');
+		const newCategory = formData.get('new-category');
+		const category = newCategory ?? selectedCategory;
+
+		const description = formData.get('description') || category;
+
+		const year = formData.get('year');
+		const month = formData.get('month');
+		const day = formData.get('day');
+		const date = formatDate(year, month, day);
+
+		const {
+			data: { user },
+		} = await supabase.auth.getUser();
+		const { error } = await supabase
+			.from('expenses')
+			.insert({ user_id: user.id, date, category, description, amount });
+
+		if (error) {
+			return fail(500, { message: 'Server error. Try again later.', success: false });
+		}
+
+		throw redirect(303, '/overview');
+	},
+};
diff --git a/src/routes/expense/+page.svelte b/src/routes/expense/+page.svelte
new file mode 100644
index 0000000..db1d8b3
--- /dev/null
+++ b/src/routes/expense/+page.svelte
@@ -0,0 +1,20 @@
+<script>
+	import AmountInput from '../../components/inputs/AmountInput.svelte';
+	import CategoryInput from '../../components/inputs/CategoryInput.svelte';
+	import DateInputs from '../../components/inputs/DateInputs.svelte';
+	import DescriptionInput from '../../components/inputs/DescriptionInput.svelte';
+
+	export let data;
+</script>
+
+<h1>Add Expense</h1>
+
+<form method="POST">
+	<AmountInput />
+	<CategoryInput categories={data.categories} />
+	<DescriptionInput />
+	<DateInputs />
+	<div>
+		<button type="submit">Save Expense</button>
+	</div>
+</form>