I’ll Tell You In Spanish | Natural Phrases That Fit

The most natural Spanish choices are “te diré,” “te lo diré,” or “voy a decírtelo,” depending on timing, tone, and what “it” refers to.

If you want to say I’ll tell you in Spanish, there isn’t just one neat line that fits every moment. Spanish gives you a few solid choices, and each one carries a slightly different feel. Some sound plain and direct. Some feel softer. Some work best when you mean “I’ll tell you later,” while others sound more like “I’m about to tell you right now.”

That’s why a straight one-word translation can leave learners with stiff Spanish. The phrase changes with context. You need to know whether you’re promising to tell someone something later, whether you’re naming the thing you’ll tell them, and whether the moment is casual, warm, tense, or matter-of-fact.

This article gives you the natural forms, shows when each one fits, and clears up the mistakes that trip people up. By the end, you’ll know which version sounds right in real conversation instead of just sounding translated.

I’ll Tell You In Spanish In Real Use

The plainest version is te diré. It means “I’ll tell you.” If you want to say “I’ll tell you later,” “I’ll tell you tomorrow,” or “I’ll tell you when I get home,” this is the form that usually lands first.

If you need to include the thing you’re going to tell, Spanish often adds a pronoun. That gives you te lo diré, which means “I’ll tell you it,” or, in natural English, “I’ll tell you” when the missing object is already clear. You’ll hear this all the time after a question like “What happened?” or “What did she say?”

There’s also voy a decírtelo. This means “I’m going to tell you it,” and it often feels closer, more immediate, and more spoken. If the words are coming out now or in the next breath, this form can sound warmer and more natural than te diré.

Here’s the fast breakdown:

• Te diré = I’ll tell you.
• Te lo diré = I’ll tell you that / I’ll tell you it.
• Voy a decírtelo = I’m going to tell you right now or very soon.
• Ya te digo = I’m telling you / I’m serious / trust me, depending on tone.

What Changes The Best Choice

The best version depends on three things. First, what are you telling? If the object matters, Spanish may want lo, la, se, or another pronoun. Second, when are you telling it? A later promise leans toward te diré. A near-immediate reply leans toward voy a decírtelo. Third, what tone do you want? Spanish is sharp about tone. A sentence can be correct and still feel off if it lands too formal, too flat, or too hard.

Take these lines:

• Te diré la verdad. = I’ll tell you the truth.
• Te lo diré luego. = I’ll tell you later.
• Voy a decírtelo ahora. = I’m going to tell you now.
• Ya te diré. = I’ll tell you later / I’ll let you know.

All four are good Spanish. The difference is feel. Ya te diré sounds a bit held back, almost like “I’ll let you know.” Voy a decírtelo ahora sounds much more immediate.

When “Te Diré” Sounds Best

Te diré works well when the timing sits a little ahead of the current moment. You’re not saying it this second. You’re saying you will say it after something else happens, or once you’ve decided, checked, remembered, or calmed down.

Say it in lines like these:

• Te diré mañana. = I’ll tell you tomorrow.
• Te diré cuando llegue. = I’ll tell you when I arrive.
• Te diré si puedo ir. = I’ll tell you if I can go.
• Luego te diré. = I’ll tell you later.

It’s clean, common, and easy to drop into everyday speech. Still, if you’re speaking with close friends or family, a longer form with voy a… can sound more natural in the heat of a real conversation.

Ways To Say “I’ll Tell You” In Spanish With The Right Tone

Many learners stop at one translation and miss the tone. That’s the part that makes Spanish sound alive. The sentence can promise, reassure, stall, warn, or tease. Same broad meaning. Different delivery.

If someone asks for gossip, “I’ll tell you later” could be playful, secretive, or firm. If someone asks for advice, “I’ll tell you the truth” needs a steady tone. If you’re in the middle of a story, “I’m going to tell you” can sound like you’re leaning in and about to spill it.

These are the forms most people need first:

English intent	Natural Spanish form	When it fits
I’ll tell you later	Te diré luego	Plain promise to say it later
I’ll tell you tomorrow	Te diré mañana	Timing is named clearly
I’ll tell you the truth	Te diré la verdad	Direct, steady, natural
I’ll tell you about it	Te contaré	Better when the sense is “tell the story”
I’m going to tell you now	Voy a decírtelo ahora	Words are coming right away
I’ll let you know	Ya te diré	Open-ended reply, often casual
I’ll tell you that later	Eso te lo diré luego	Object is already known
I’ll tell you everything	Te lo contaré todo	Storytelling, detail, fuller answer

That fourth row matters. English uses “tell” for many jobs. Spanish often splits the work. If you mean “tell a story” or “tell someone all about it,” contar may sound better than decir. So “I’ll tell you about the trip” is often better as te contaré sobre el viaje or just te contaré del viaje, depending on region and style.

When To Use “Decir” And When To Use “Contar”

Decir is the go-to verb for saying words, passing along a message, giving an answer, or stating something directly. The RAE entry for decir lines up with that broad use. If your sentence is short and pointed, decir usually fits.

Contar leans more toward telling a story, sharing details, or narrating events. So if “I’ll tell you” means “I’ll fill you in,” Spanish often sounds better with contar. That swap is one of the cleanest ways to sound less translated.

Compare these:

• Te diré mi respuesta. = I’ll tell you my answer.
• Te contaré lo que pasó. = I’ll tell you what happened.

Both are right. They just do slightly different jobs.

How Pronouns Change The Sentence

This is where many learners wobble. English says “I’ll tell you” and leaves the object hanging. Spanish often wants the object if it’s already active in the conversation. That’s why te lo diré shows up so often.

The pattern is simple:

• te = to you
• lo / la = it
• se lo = to him/her/them + it

The RAE’s usage note on decir helps with this, and the RAE note on unstressed pronoun position shows why forms like decírtelo and te lo diré are both normal, depending on sentence shape.

So you can say:

• Te lo diré. = I’ll tell you.
• Voy a decírtelo. = I’m going to tell you.
• Se lo diré. = I’ll tell him / her / them.

Those aren’t fancy grammar tricks. They’re everyday Spanish. Once you get used to them, your sentences stop sounding like direct English copies.

How Reported Speech Affects “I’ll Tell You”

Sometimes “I’ll tell you” isn’t a promise. It’s part of a larger line, like “She said she’d tell you” or “Tell him I’ll tell you later.” In those cases, the structure can shift. Reported speech changes timing words, pronouns, and the feel of the sentence.

The Cervantes activity on indirect speech is useful here. It shows how Spanish reworks messages once they’re reported through someone else’s words.

Here are common patterns:

• Ella dijo que te diría. = She said she would tell you.
• Le dije que te lo diría. = I told him I would tell you.
• Dice que va a decírtelo. = He says he’s going to tell you.

If you’re only trying to say the original line in direct speech, you don’t need to go far into this. Still, it helps to know why the verb form changes once another speaker enters the sentence.

Common mistake	Natural fix	Why it sounds better
Yo te diré eso now	Te lo diré ahora	Spanish places the pronoun cleanly and keeps the sentence native
Voy a te decir	Voy a decirte / Voy a decírtelo	Pronouns attach to the infinitive or go before a conjugated verb
Te contaré la verdad exacta	Te diré la verdad	Decir fits direct statements better here
Diré te luego	Te diré luego	Word order follows normal spoken Spanish
Te lo contaré la respuesta	Te diré la respuesta	Contar sounds off when the sense is a direct answer

Regional Flavor And What Stays Stable

Spanish changes from place to place, but the forms in this article travel well. Te diré, te lo diré, and voy a decírtelo sound normal across the Spanish-speaking world. What changes more is rhythm, not the base structure.

In some places, speakers may lean more often on te cuento or ya te digo in casual talk. In others, the directness of te diré lands just fine. Still, the core pattern remains steady, so you’re safe using these forms in most settings.

The Best Pick For Most Learners

If you want one safe default, use te diré when the meaning is “I’ll tell you later” or “I’ll tell you when I know.” Use te lo diré when the “it” is already clear. Use voy a decírtelo when you’re about to say it now.

That trio will carry you through a big share of everyday situations. You don’t need ten versions in your head. You need three that fit cleanly and sound natural when spoken out loud.

Putting It Into Smooth, Everyday Spanish

Here’s a simple way to lock it in. Ask yourself two questions. Am I saying it later, or am I about to say it now? And do I need the object in the sentence, or is it clear enough without it?

If it’s later, reach for te diré. If the object is clear and active, reach for te lo diré. If the words are about to come out, reach for voy a decírtelo. That tiny check keeps your Spanish neat and natural.

Say these out loud a few times:

• Te diré cuando pueda.
• Te lo diré en un minuto.
• Voy a decírtelo ahora mismo.
• Ya te diré.

Once those lines feel easy, you won’t have to translate from English each time. You’ll just choose the one that fits the moment and move on.