diff --git a/README.md b/README.md
index 903c04b..96a215e 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,7 @@ Built with Svelte for speed and simplicity. No overwhelming features, no endless
 - ↩️ **Undo** - `Cmd/Ctrl+Z` brings back a deleted task, in its original position
 - 📅 **Today & Tomorrow lists** - Plan ahead with separate task lists
 - 🔄 **Unfinished work carries over** - When a new day begins, tasks you didn't finish move to Today; completed ones are cleared away
+- ➡️ **Push a task to tomorrow** - Didn't get to it? Move it across without retyping it
 - 🎯 **Reorder by drag or keyboard** - Drag with a mouse, long-press and drag on touch, or use `Alt+↑`/`Alt+↓`
 - 💾 **Persistent storage** - All tasks saved locally in your browser
 - 📊 **Task statistics** - See how many tasks remain at a glance
@@ -90,6 +91,7 @@ The date, storage, rollover, task and undo logic lives in `src/lib/` as plain mo
 - **Complete a task**: Click the checkbox next to the task
 - **Delete a task**: Click the delete icon on the task (it shows on hover, and is always visible on touch), or press `Delete` with the task focused
 - **Undo a delete**: Press `Cmd/Ctrl+Z`. The task returns to where it was
+- **Move a task to Tomorrow**: Click the arrow on the task, or press `Alt+→`. From Tomorrow, the arrow points back and `Alt+←` returns it to Today
 - **Reorder tasks**: Drag with a mouse, long-press then drag on touch, or focus a task and press `Alt+↑`/`Alt+↓`
 - **Clear input**: Press Escape while the input is focused
 
@@ -128,6 +130,7 @@ Import only ever adds. Tasks already present are left alone, so importing the sa
 - **Delete**: Delete the focused task
 - **Cmd/Ctrl+Z**: Undo the last delete or clear-completed
 - **Alt+↑ / Alt+↓**: Move the focused task up or down
+- **Alt+→ / Alt+←**: Send the focused task to Tomorrow, or bring it back to Today
 
 Backspace no longer deletes a task. It is too easily pressed by accident, and deletions used to be unrecoverable.
 
diff --git a/src/App.svelte b/src/App.svelte
index 6fbd9c7..80e9591 100644
--- a/src/App.svelte
+++ b/src/App.svelte
@@ -12,6 +12,7 @@
   import { createUndoStack, applyUndo } from './lib/undo.js';
   import { shouldHandleUndo } from './lib/shortcuts.js';
   import { buildExport, serialize, parseImport, mergeImport } from './lib/backup.js';
+  import { moveTaskToDay } from './lib/defer.js';
 
   const storage = createStorage();
   const undoStack = createUndoStack();
@@ -75,6 +76,15 @@
     setTasks(taskOps.clearCompleted(tasks));
   }
 
+  const viewingToday = $derived(selectedKey === todayKey);
+
+  /** "Not today, tomorrow" and its reverse. Which direction depends only on
+   *  which day you are looking at, so one control covers both. */
+  function deferTask(taskId) {
+    const destination = viewingToday ? tomorrowKey() : todayKey;
+    tasks = moveTaskToDay(storage, selectedKey, destination, taskId);
+  }
+
   function undo() {
     const entry = undoStack.pop();
     if (entry) setTasks(applyUndo(tasks, entry));
@@ -183,6 +193,17 @@
     if (event.altKey && (event.key === 'ArrowUp' || event.key === 'ArrowDown')) {
       event.preventDefault();
       moveTask(taskId, event.key === 'ArrowUp' ? -1 : 1);
+      return;
+    }
+
+    // Right sends a task forward to Tomorrow, left brings it back. Only the
+    // one that makes sense from here does anything.
+    if (event.altKey && event.key === 'ArrowRight' && viewingToday) {
+      event.preventDefault();
+      deferTask(taskId);
+    } else if (event.altKey && event.key === 'ArrowLeft' && !viewingToday) {
+      event.preventDefault();
+      deferTask(taskId);
     }
   }
 
@@ -595,7 +616,26 @@
                 <span class="task-text">{task.text}</span>
                 
                 <button
-                  class="delete-btn"
+                  class="row-btn defer-btn"
+                  onclick={() => deferTask(task.id)}
+                  title={viewingToday ? 'Move to Tomorrow' : 'Move to Today'}
+                  aria-label={viewingToday ? `Move ${task.text} to Tomorrow` : `Move ${task.text} to Today`}
+                >
+                  {#if viewingToday}
+                    <svg viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+                      <path d="M5 12H19" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
+                      <path d="M13 6L19 12L13 18" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
+                    </svg>
+                  {:else}
+                    <svg viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+                      <path d="M19 12H5" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
+                      <path d="M11 6L5 12L11 18" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
+                    </svg>
+                  {/if}
+                </button>
+
+                <button
+                  class="row-btn delete-btn"
                   onclick={() => deleteTask(task.id)}
                   aria-label="Delete {task.text}"
                 >
diff --git a/src/lib/defer.js b/src/lib/defer.js
new file mode 100644
index 0000000..000413b
--- /dev/null
+++ b/src/lib/defer.js
@@ -0,0 +1,28 @@
+/**
+ * Moves one task from one day to another and returns what is left on the
+ * source day.
+ *
+ * This is the verb a two-day app is built around: "not today, tomorrow". Both
+ * days are written before returning, so a caller only has to reload the day it
+ * is showing.
+ *
+ * A task already sitting at the destination is not duplicated. It still leaves
+ * the source day, which is what someone dragging a stray copy around would
+ * expect.
+ */
+export function moveTaskToDay(storage, fromKey, toKey, taskId) {
+  const source = storage.loadTasks(fromKey)
+  if (fromKey === toKey) return source
+
+  const moving = source.find(task => task.id === taskId)
+  if (!moving) return source
+
+  const remaining = source.filter(task => task.id !== taskId)
+  const destination = storage.loadTasks(toKey)
+  const alreadyThere = destination.some(task => task.id === taskId)
+
+  storage.saveTasks(fromKey, remaining)
+  if (!alreadyThere) storage.saveTasks(toKey, [...destination, moving])
+
+  return remaining
+}
diff --git a/src/lib/defer.test.js b/src/lib/defer.test.js
new file mode 100644
index 0000000..06c448c
--- /dev/null
+++ b/src/lib/defer.test.js
@@ -0,0 +1,83 @@
+import { describe, it, expect } from 'vitest'
+import { createStorage, createMemoryStore } from './storage.js'
+import { moveTaskToDay } from './defer.js'
+
+const task = (id, text = id) => ({ id, text, completed: false, createdAt: 1000 })
+
+const setup = (seed = {}) => {
+  const backend = createMemoryStore()
+  for (const [day, tasks] of Object.entries(seed)) {
+    backend.setItem(`negotium-tasks-${day}`, JSON.stringify(tasks))
+  }
+  return createStorage(backend)
+}
+
+const TODAY = '2026-08-16'
+const TOMORROW = '2026-08-17'
+
+describe('moveTaskToDay', () => {
+  it('removes the task from the source day', () => {
+    const storage = setup({ [TODAY]: [task('a'), task('b')] })
+    moveTaskToDay(storage, TODAY, TOMORROW, 'a')
+    expect(storage.loadTasks(TODAY).map(t => t.id)).toEqual(['b'])
+  })
+
+  it('appends the task to the destination day', () => {
+    const storage = setup({ [TODAY]: [task('a')], [TOMORROW]: [task('existing')] })
+    moveTaskToDay(storage, TODAY, TOMORROW, 'a')
+    expect(storage.loadTasks(TOMORROW).map(t => t.id)).toEqual(['existing', 'a'])
+  })
+
+  it('works when the destination day has nothing stored yet', () => {
+    const storage = setup({ [TODAY]: [task('a')] })
+    moveTaskToDay(storage, TODAY, TOMORROW, 'a')
+    expect(storage.loadTasks(TOMORROW).map(t => t.id)).toEqual(['a'])
+  })
+
+  it('carries the task across unchanged', () => {
+    const original = { id: 'a', text: 'buy milk', completed: true, createdAt: 42 }
+    const storage = setup({ [TODAY]: [original] })
+    moveTaskToDay(storage, TODAY, TOMORROW, 'a')
+    expect(storage.loadTasks(TOMORROW)[0]).toEqual(original)
+  })
+
+  it('returns the source day’s remaining tasks', () => {
+    const storage = setup({ [TODAY]: [task('a'), task('b')] })
+    const result = moveTaskToDay(storage, TODAY, TOMORROW, 'a')
+    expect(result.map(t => t.id)).toEqual(['b'])
+  })
+
+  it('leaves the other tasks in their original order', () => {
+    const storage = setup({ [TODAY]: [task('a'), task('b'), task('c')] })
+    moveTaskToDay(storage, TODAY, TOMORROW, 'b')
+    expect(storage.loadTasks(TODAY).map(t => t.id)).toEqual(['a', 'c'])
+  })
+
+  it('is a no-op for an id that is not there', () => {
+    const storage = setup({ [TODAY]: [task('a')] })
+    const result = moveTaskToDay(storage, TODAY, TOMORROW, 'zzz')
+    expect(result.map(t => t.id)).toEqual(['a'])
+    expect(storage.loadTasks(TOMORROW)).toEqual([])
+  })
+
+  it('is a no-op when source and destination are the same day', () => {
+    const storage = setup({ [TODAY]: [task('a')] })
+    const result = moveTaskToDay(storage, TODAY, TODAY, 'a')
+    expect(result.map(t => t.id)).toEqual(['a'])
+    expect(storage.loadTasks(TODAY).map(t => t.id)).toEqual(['a'])
+  })
+
+  it('moves back the other way just as well', () => {
+    const storage = setup({ [TOMORROW]: [task('a')], [TODAY]: [task('b')] })
+    moveTaskToDay(storage, TOMORROW, TODAY, 'a')
+    expect(storage.loadTasks(TODAY).map(t => t.id)).toEqual(['b', 'a'])
+    expect(storage.loadTasks(TOMORROW)).toEqual([])
+  })
+
+  it('does not duplicate a task already present at the destination', () => {
+    const storage = setup({ [TODAY]: [task('a')], [TOMORROW]: [task('a')] })
+    moveTaskToDay(storage, TODAY, TOMORROW, 'a')
+    expect(storage.loadTasks(TOMORROW).map(t => t.id)).toEqual(['a'])
+    expect(storage.loadTasks(TODAY)).toEqual([])
+  })
+})
diff --git a/src/style.css b/src/style.css
index b9b932a..4e1f32b 100644
--- a/src/style.css
+++ b/src/style.css
@@ -381,7 +381,7 @@ html.dark .task-item.dragging {
   color: var(--completed-text);
 }
 
-.delete-btn {
+.row-btn {
   width: 32px;
   height: 32px;
   border: none;
@@ -398,11 +398,16 @@ html.dark .task-item.dragging {
   flex-shrink: 0;
 }
 
+.defer-btn:hover {
+  background-color: var(--hover);
+  color: var(--accent);
+}
+
 /* focus-within matters as much as hover here: the button is opacity 0 by
    default, so a keyboard user tabbing to it previously saw nothing at all:
    the focus outline was drawn on an invisible element. */
-.task-item:hover .delete-btn,
-.task-item:focus-within .delete-btn {
+.task-item:hover .row-btn,
+.task-item:focus-within .row-btn {
   opacity: 1;
 }
 
@@ -412,7 +417,7 @@ html.dark .task-item.dragging {
   transform: scale(1.1);
 }
 
-.delete-btn svg {
+.row-btn svg {
   width: 16px;
   height: 16px;
 }
@@ -558,14 +563,14 @@ html.dark .data-status.error {
  * just easier to hit. Kept behind the media query so a mouse still gets small,
  * precise targets and the full row stays available to drag. */
 @media (hover: none) {
-  .delete-btn {
+  .row-btn {
     opacity: 1;
   }
 }
 
 @media (pointer: coarse) {
   .checkbox::after,
-  .delete-btn::after {
+  .row-btn::after {
     content: '';
     position: absolute;
     top: 50%;