Spanish Accent Rules Explained: When to Use Accent Marks

Key takeaways

• Accent marks show which syllable to stress and can change the meaning of short words like tu and tú.
• Most Spanish words follow predictable stress patterns, so accent marks usually appear only when a word breaks the normal pattern.
• Monosyllabic words normally carry no accent, but several monosyllabic pairs (tú/tu, él/el, sé/se, sí/si) use the accent to separate two different words with the same spelling
• Interrogative and exclamatory words (qué, cómo, cuándo, dónde, quién) always carry a written accent regardless of where they appear in the sentence

Spanish learners often treat accent marks as optional decoration or assume they appear at random. In practice, accent marks follow a logical system that connects directly to how Spanish syllables are stressed when spoken aloud.

Once you understand the default stress rules, the written accent becomes predictable: it appears precisely when a word breaks from those defaults. italki connects learners with Spanish teachers who can demonstrate these patterns in real speech so the written and spoken systems reinforce each other.

This guide covers the three default stress rules, the four word stress categories (aguda, llana, esdrújula, sobreesdrújula), disambiguation accents for monosyllabic pairs, interrogative and exclamatory words, and the hiatus accent.

What the accent mark does

The written accent mark in Spanish (´) does two distinct things:

Stress marking: Spanish stress is predictable by rule for most words, but when a word breaks the default pattern, the written accent tells you which syllable receives the stress. Without it, a reader would apply the wrong stress automatically.

Meaning disambiguation: Some words that sound identical (or would be spelled identically) are distinguished purely by the presence or absence of an accent: tú (you) vs tu (your), él (he) vs el (the). The accent here does not change pronunciation; it separates two different words.

Understanding which function applies in each case makes the accent system logical rather than arbitrary.

The three default stress rules

Spanish readers apply these three rules automatically when no accent is written:

Rule 1: Words ending in a vowel (a, e, i, o, u), the letter n, or the letter s are stressed on the second-to-last syllable.

• casa (CA-sa), hablan (HA-blan), comes (CO-mes)

Rule 2: Words ending in any consonant other than n or s are stressed on the last syllable.

• reloj (re-LOJ), papel (pa-PEL), ciudad (ciu-DAD)

Rule 3: Words that break either rule carry a written accent on the stressed syllable to override the default.

These three rules are the foundation. The written accent exists only to mark exceptions to rules 1 and 2.

Agudas: stress on the last syllable

Agudas are words stressed on the last syllable. They follow Rule 2 naturally when they end in a consonant other than n or s. When an aguda ends in a vowel, n, or s, it breaks Rule 1, so it needs a written accent.

Word	Stress	Written accent?	Reason
papel	pa-PEL	No	Ends in consonant (not n/s): Rule 2 applies
reloj	re-LOJ	No	Ends in consonant (not n/s): Rule 2 applies
café	ca-FÉ	Yes	Ends in vowel; Rule 1 would give CA-fe
camión	ca-MIÓN	Yes	Ends in n; Rule 1 would give CA-mion
adiós	a-DIÓS	Yes	Ends in s; Rule 1 would give A-dios
canté	can-TÉ	Yes	Ends in vowel; Rule 1 would give CAN-te

Llanas: stress on the second-to-last syllable

Llanas (also called graves or paroxytones) are words stressed on the second-to-last syllable. They follow Rule 1 naturally when they end in a vowel, n, or s. When a llana ends in any other consonant, it breaks Rule 2, so it needs a written accent.

Word	Stress	Written accent?	Reason
casa	CA-sa	No	Ends in vowel: Rule 1 applies
libro	LI-bro	No	Ends in vowel: Rule 1 applies
árbol	ÁR-bol	Yes	Ends in l (not n/s); Rule 2 would give ar-BOL
lápiz	LÁ-piz	Yes	Ends in z; Rule 2 would give la-PIZ
fácil	FÁ-cil	Yes	Ends in l; Rule 2 would give fa-CIL
útil	Ú-til	Yes	Ends in l; Rule 2 would give u-TIL

Esdrújulas and sobreesdrújulas: always written

Esdrújulas are words stressed on the third-to-last syllable. They always break Rule 1, so they always carry a written accent. There are no exceptions.

• médico (MÉ-di-co), música (MÚ-si-ca), rápido (RÁ-pi-do)
• número (NÚ-me-ro), página (PÁ-gi-na), público (PÚ-bli-co)

Sobreesdrújulas are stressed even further back (fourth-to-last or beyond). These occur mostly with verb forms that have object pronouns attached:

• dígamelo (DÍ-ga-me-lo: tell it to me), tráiganoslo (TRÁIGAN-os-lo)

If you see a word with three or more syllables before the stress, it will always have a written accent.

A Spanish teacher can practice these stress categories with you through pronunciation drills that connect what you see on the page with what you hear and produce in speech.

Monosyllabic disambiguation pairs

Single-syllable words in Spanish normally carry no accent because there is no stress ambiguity in a one-syllable word. However, some monosyllabic pairs are spelled identically and need an accent to distinguish between two different words with different grammatical roles.

With accent	Meaning	Without accent	Meaning
tú	you (subject pronoun)	tu	your (possessive)
él	he (subject pronoun)	el	the (definite article)
sé	I know / be! (imperative)	se	reflexive pronoun
sí	yes / oneself	si	if (conjunction)
mí	me (after prepositions)	mi	my (possessive)
té	tea	te	you (object pronoun)
más	more	mas	but (literary conjunction)
dé	give (subjunctive)	de	of / from (preposition)
aún	still / yet	aun	even (even when)

These pairs must be memorized because the accent does not change pronunciation: tú and tu are pronounced identically. The distinction is purely orthographic.

Interrogative and exclamatory words

Question words and exclamatory words always carry an accent in Spanish, regardless of whether they appear in a direct or indirect question, or in an exclamation.

Word	Meaning	Example
qué	what / how (exclamatory)	¿Qué quieres? / ¡Qué bonito!
cómo	how	¿Cómo estás? / No sé cómo llegó.
cuándo	when	¿Cuándo llega? / Dime cuándo llegas.
dónde	where	¿Dónde vives? / No sé dónde está.
quién	who	¿Quién es? / No sé quién llamó.
cuál	which	¿Cuál prefieres?
cuánto	how much	¿Cuánto cuesta?
cuántos	how many	¿Cuántos años tienes?
por qué	why	¿Por qué tardaste?

Compare with the same words when they are not interrogative or exclamatory:

• que (that, conjunction): Creo que es tarde.
• como (as / like / how in non-question contexts): Come como un rey.
• cuando (when, non-question): Cuando llegues, llámame.

The accent marks the interrogative or exclamatory function, while Spanish question marks show the punctuation pattern that surrounds full questions.

The hiatus accent

A hiatus occurs when two vowels appear next to each other but belong to different syllables, meaning each vowel is pronounced separately. In Spanish, when a weak vowel (i or u) is stressed and appears next to a strong vowel (a, e, o), an accent is written to signal that they form two syllables, not one diphthong.

Word	Syllable break	Without accent it would be…
día	dí-a	dia (one syllable, diphthong)
María	Ma-rí-a	Maria (diphthong on ia)
continúa	con-ti-nú-a	continua (diphthong)
país	pa-ís	pais (diphthong ai)
maíz	ma-íz	maiz (diphthong ai)
reúne	re-ú-ne	reune (diphthong eu)

This accent overrides the normal stress rules: its job is not to mark unusual stress but to break a diphthong and signal two separate syllables.

Common mistakes and how to avoid them

• Omitting accents on esdrújulas: all words stressed on the third-to-last syllable always carry the accent. If you see a three-plus-syllable word with no accent, assume the stress falls on the second-to-last syllable.
• Confusing tú and tu, él and el: these are among the most common written errors. The subject pronouns (tú, él) take accents; the article el and the possessive tu do not.
• Forgetting accents on interrogative words in indirect questions: ¿Sabes dónde está? (do you know where it is?) uses dónde with an accent even though it is an indirect question embedded in a statement.
• Adding accents to monosyllables that do not form a disambiguation pair: words like fe (faith), fui (I went), fue (he/she went), vio (he/she saw), and dio (he/she gave) have no written accent in modern Spanish orthography.
• Applying the accent to adjectives/verbs to mark importance: the accent in Spanish marks stress or disambiguation only, not emphasis.

Practice Spanish accents with a tutor

Understanding the accent system intellectually and applying it automatically when writing are different skills. The fastest path between them is practice with feedback. italki has 30,000+ expert tutors trusted by over 10 million learners worldwide, including Spanish tutors who can give you writing tasks, check your accent placement, and connect the written system to the spoken stress you produce. Book a trial lesson and start applying these rules with confidence.

FAQ

Do I need to write accent marks when typing in Spanish?

Yes. In formal written Spanish (emails, essays, professional communication, and any published text), accent marks are required and their omission is considered an error. In informal text messages, many native speakers omit them for speed, but this is a stylistic shortcut, not a rule. For learners, the best habit is to always write accents correctly so the association between spelling and pronunciation is consistent.

Does the accent change the pronunciation of a vowel?

No. The Spanish accent mark is a stress marker, not a vowel quality marker. The vowel é in café is pronounced the same way as the e in every other Spanish word: a pure, consistent vowel. The accent only tells you which syllable to stress, and in the case of disambiguation pairs, it distinguishes two words. Compare this with languages like French where the accent can change the vowel sound (é vs è vs e).

What is the difference between a tilde and an accent mark in Spanish?

In everyday usage, many Spanish speakers use tilde to refer to the written accent mark (´). Technically, the tilde is a separate mark: the wavy line over the ñ (as in España or mañana). The accent mark is the acute accent (´) used on vowels. However, in informal conversation, calling the acute accent a tilde is understood and common in much of the Spanish-speaking world.