Write a letter to your future self around six things: the date and what your life looks like right now, what is worrying you, what you are hoping will have happened, one prediction you are willing to be wrong about, one thing you want to be reminded of, and a question for the person reading it. Those six give the future reader something to compare against, which is what makes the letter worth opening. Keep it to a page, and decide when it comes back before you start writing.
Write the ordinary details, not the big feelings
The parts that land hardest on reading are almost never the reflections. They are the small facts: what the commute was, who you were having coffee with, how much the rent was, what was unresolved at work that week. Those are the details that will have changed without you noticing.
Big declarations about who you want to become age badly, because they tend to be true of everyone and specific to nobody. A paragraph about the current week is worth more than a page about your values.
Why writing to your future self does anything
The reason this is more than a nice exercise is that most people relate to their future self as a stranger. Decisions that cost you now and pay you later feel like doing a favour for somebody else, which is a reasonable description of why they are hard.
Hershfield and colleagues (2011) tested this directly: people shown age-progressed images of themselves, made to feel more connected to the person they would become, allocated more money to retirement than those shown their current face. The mechanism was not new information about saving. It was a reduced sense that the beneficiary was somebody else.
A letter does the cheap version of the same thing. You spend twenty minutes treating your future self as a real person with a real week, and the decisions you make on their behalf change slightly. That is the whole claim, and it is a modest one: this is not a productivity system, it is a way of making a distant person feel close enough to act for.
The reverse direction works for a different reason. Writing to your past self is a way of noticing change you have stopped crediting yourself with, which is the thing people are most consistently wrong about when they describe their own progress.
A letter that is actually written
Most examples of this are written to be read by strangers, which is why they sound like it. Here is a short one with the six parts doing their job. The specifics are invented; the shape is the point.
"2 October 2026. I am in the Dalston flat, third year, rent just went up to £1,480 and we are pretending that is fine. Still at the same job. I have been doing the 7am gym thing for five weeks, which is four weeks longer than last time.
What is worrying me: that the restructure lands in January and I find out I have been treading water for two years. Also that I have not called my brother since August and I keep not doing it.
What I am hoping has happened: I have moved teams or left. The 7am thing is still going. I have been to Lisbon. The brother thing is fixed and was not as hard as I am making it.
A prediction I will probably get wrong: I think I will stay. I think the restructure will be smaller than everyone says and I will tell myself that is a reason to stay another year.
What I want you to remember: you did the hard version in 2024 and it worked. You are not someone who cannot do hard things, you are someone who waits too long to start them.
A question: did you leave, and if you did not, what did you tell yourself?"
That letter is about 200 words and would be worth opening in a year. Note what it is not doing: no values, no goals list, no encouragement. The rent figure and the unmade phone call carry more than a paragraph about growth would.
Four versions, depending on the occasion
The six parts stay the same. What changes is the interval and the question at the end, and the interval is the decision people get wrong most often.
One year, the default
Long enough that the ordinary details will have changed, short enough that the letter still arrives. If you are unsure, pick this. Ask: what is the one thing I said I would do and did not?
Five years, the ambitious one
More dramatic to read and far more likely to go missing, so the mechanism matters more than the content. Write less about this week and more about the direction. Ask: is this still what I wanted, or did I just keep going?
Before a decision, the sealed one
Written the week you decide something big and opened once the result is known. This is the most useful version, because it records your reasoning before you know the outcome and before hindsight rewrites it. Ask: was I wrong for the reasons I would now claim?
The new year one, with a caveat
Popular, and the weakest, because January letters tend to be written in resolution voice and read as embarrassing by March. If you write one in January, write the ordinary details and skip the intentions.
Writing to your past self instead
The other direction is a different exercise and it is worth doing once. A letter to your past self is not advice they can use, which is the thing people get stuck on. It is a record of what you now know that you did not know then, and it is the most direct way to see change you have stopped giving yourself credit for.
Pick one specific moment rather than a period: the week you started the job, the month it ended, the day you decided. Then write what you would tell them, and then write the part they would not have believed. That second part is where the useful material is.
It also tends to be gentler than people expect. Most people are harder on their current self than on the version of themselves from five years ago, which is itself worth noticing.
Make sure it actually comes back
A letter you leave in a drawer is a letter you will find in nine years by accident, which is a different and lesser experience than opening one on a date you chose. Pick the date first, then pick the mechanism: a calendar reminder with the file attached, a scheduled email, or a service that mails it back to you.
A year is the usual interval and a good default. Five years is more dramatic and much more likely to go missing.
In Crystal, this is a future snapshot, on the Future page inside Routine. The act is the same one. The difference is that the letter comes back on schedule, it sits next to the goals you set at the time, and Crystal can hold it up against what actually happened rather than leaving you to remember.
How to do it
Date it and say where you are
The date, the city, the job, who you live with, what the week has been like. Two or three sentences of plain fact. This is the comparison point and it is the part you will not be able to reconstruct later.
Write down what is worrying you
Name the specific thing, not the general anxiety. Most of these resolve, and reading back a list of resolved worries is the most consistently useful thing a letter like this does.
Say what you are hoping will have happened
Three or four things, concretely. Not "be happier" but the actual events you are hoping for. Concrete hopes can be checked; abstract ones cannot.
Make one prediction you might get wrong
About work, a relationship, the world, anything. Being wrong is the point: a prediction you are certain of teaches you nothing when you read it back.
Write the thing you want to be reminded of
One line that the version of you reading this might need. Keep it specific to your actual situation rather than general encouragement, which will read as hollow coming from yourself.
Ask the reader a question, then set the return date
End with a direct question to whoever opens this, because it forces a reply and turns the letter into the first half of something. Then set the date and the mechanism before you close the file.
Common questions
How do you start a letter to your future self?
Start with the date and three sentences of plain fact: where you live, what the job is, what the week has been like. Not a greeting and not a statement of intent. The ordinary details are the comparison point, and they are the part you will be unable to reconstruct later, which makes them the part worth writing first while they are still boring to you.
How long should a letter to your future self be?
One page, or roughly 200 to 400 words. Long letters turn into essays about values, which age badly and are the part people skim when the letter comes back. Six short paragraphs doing six specific jobs beats a page of reflection.
How far in the future should I send it?
One year is the default and the right answer if you are unsure: long enough for the ordinary details to have changed, short enough that the letter actually arrives. Five years reads better and goes missing far more often, so if you pick it, spend the effort on the delivery mechanism rather than the prose.
Does writing to your future self actually work?
For a modest and specific thing, yes. Most people relate to their future self as a stranger, which is part of why decisions that cost now and pay later are hard. Hershfield and colleagues (2011) found that people made to feel more connected to their future selves allocated more to retirement. A letter is a cheap version of the same move. It is not a productivity system and it will not make you do anything on its own.
What should you write in a letter to your future self?
The date and the ordinary details of your life right now, what is worrying you, what you are hoping for, a prediction you might get wrong, something you want to be reminded of, and a question for the person reading it. The plain details matter more than the reflections.
How long should the letter be?
A page. Long enough for the six parts above, short enough that you finish it in one sitting. Letters that aim for profundity tend to get abandoned halfway and never sent.
How far in the future should you send it?
A year is the standard and works well: long enough that things have changed, short enough that you remember writing it. Five and ten year letters are more striking to receive and far more likely to be lost before they arrive.
What is a letter to your younger self?
The same exercise pointed backwards: writing to a past version of yourself about what you now know. It is a reflection rather than a prediction, so it cannot be checked later, which makes it good for processing something and less good as a record.
Keep reading
How to set goals
This is the method, in order, with the parts most guides leave out: how many to set, what the first week looks like, and what you do on the week it goes wrong.
ReadGoal setting worksheet
Nine prompts, in order, designed to be answered on one side of paper. It takes about thirty minutes and the last two prompts are the ones that matter most.
ReadSMART goals
The best known goal framework there is, and a genuinely useful one, as long as you know which part of the problem it solves and which part it leaves to you.
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About the author
Drew D’Agostino, founder of Crystal.
Drew founded Crystal, the AI coach that understands you, used by millions of people to understand themselves and the people around them. He is the author of Predicting Personality, a book on reading other people through personality science to improve communication and business relationships.