“I will let you know” can mean that you will provide an update, return with an answer, confirm something later, or notify the person when a change happens. Natural alternatives include “I’ll keep you posted,” “I’ll update you,” and “I’ll get back to you.”
Choose the Phrase for “I Will Let You Know” by What Happens Next
- I’ll keep you posted
- I’ll update you
- I’ll get back to you
- I’ll keep you informed
- I’ll let you know as soon as I know
- I’ll keep you in the loop
- I’ll follow up
- I’ll send you an update
- I’ll confirm once I know
- I’ll notify you
- I’ll be in touch
I’ll keep you posted
Use this when you expect to provide ongoing updates as the situation develops.
Example: I’ll keep you posted as soon as we hear anything from the supplier.
I’ll update you
A concise professional option when you will send new information later.
Example: I’ll update you after tomorrow’s meeting.
I’ll get back to you
Best when you need time to check something, make a decision, or find an answer before responding.
Example: I’ll get back to you once I’ve checked the figures.
I’ll keep you informed
A slightly more formal phrase for making sure someone receives relevant developments.
Example: I’ll keep you informed of any changes to the timetable.
I’ll let you know as soon as I know
Useful when you are also waiting for information and cannot yet give a definite answer.
Example: I’ll let you know as soon as I know whether the funding has been approved.
I’ll keep you in the loop
A conversational workplace phrase meaning you will continue to include the person in relevant updates.
Example: I’ll keep you in the loop as the plans develop.
I’ll follow up
Use this when you plan to return to the person with an answer, action, or additional information.
Example: I’ll follow up next week once I’ve spoken to the finance team.
I’ll send you an update
A clear option when the next contact will specifically be a written update.
Example: I’ll send you an update by the end of the day.
I’ll confirm once I know
Best when the outstanding information is a definite decision, time, booking, or arrangement.
Example: I’ll confirm once I know whether Tuesday is available.
I’ll notify you
A formal and direct option for alerts, official changes, outcomes, or administrative processes.
Example: We’ll notify you when your application has been reviewed.
I’ll be in touch
A broad phrase indicating future contact without specifying exactly what form the update will take.
Example: I’ll be in touch once we have agreed the next steps.
Avoid Promising a Time You Cannot Meet
If you know when you will respond, adding a timeframe is more useful than the phrase alone: “I’ll update you by Friday” or “I’ll get back to you tomorrow.” If you are waiting on someone else, “I’ll let you know as soon as I know” accurately reflects that uncertainty.