Letter to your future self

Write to the person you will be in six months. It changes what you do this week.

10–15 minutes · Once every few months · Free

What it is

You write a letter to yourself at a date you choose — three months, six months, a year — and it stays sealed until then. When it unlocks, you read what you were carrying, hoping for and worried about, in your own words.

The interesting part is not the reading. It is the writing. Most of us relate to our future selves roughly the way we relate to a stranger, which is why it is so easy to hand them the difficult task, the debt, the conversation we are avoiding. Addressing that person directly makes them feel less like a stranger.

People who feel more continuous with their future self make measurably different decisions — they save more, plan further ahead, and are less likely to take the easy option now at that person's expense.

How to do it

1. Pick when it opens. Three months is enough for things to have changed; a year is enough to be surprised.
2. Tell them what this period is actually like. Not the tidy version.
3. Say what you hope will be different, and what you suspect will not be.
4. Ask them something. A question you genuinely want answered makes the reading land harder.
5. Seal it. Kansha emails you when it unlocks.

What you might get from it

• Makes long-term consequences feel like they belong to someone real
• Gives you a fixed record of what mattered at a point in time, which memory quietly rewrites
• The reading, months later, is often the single most affecting thing in the app

What the research says

Evidence: Moderate. Hershfield and colleagues have shown that "future self-continuity" — how connected you feel to the person you will be — predicts long-term decisions, and that interventions increasing that sense change behaviour.

• Hershfield, H. E. (2011). Annals of the New York Academy of Sciences. Future self-continuity predicts saving and long-term decision-making. https://doi.org/10.1111/j.1749-6632.2011.06201.x

Where that runs out

Most of this research measures financial and planning decisions rather than mood or wellbeing, and much of it uses digital-ageing or visualisation rather than letter-writing specifically. The mechanism is well supported; this particular delivery of it is a reasonable inference rather than a directly tested intervention.