“A non-refundable 30% deposit is required at the time of booking.”

English Lesson: A non-refundable 30% deposit is required at the time of booking.

You're looking for a reception hall to have your wedding in. You read this sentence on the website for one reception hall that you might like to reserve.

A non-refundable 30% deposit is required at the time of booking.

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(something) is required

When you say that something "is required", it means that people have to do it.

Things that people often say "are required" include:

  • Attendance is required.
  • Registration is required. (You have to register.)
  • Immediate action is required. (You have to act quickly.)
  • Further research is required. (This is often used at the end of academic journal articles to say that someone needs to research a topic more.)
  • A permit is required. (You need a permit, which is an official document that shows you're allowed to do something.)

a non-refundable deposit

A "deposit" is some money that you pay at first when you're reserving something. You might need to pay a "deposit" in situations like:

  • when renting a car
  • when signing up for classes
  • when renting an apartment

You can express the amount of a deposit like this:

a $400 deposit 

a 10% deposit

Sometimes a deposit is "non-refundable". This means that you can't get the deposit back after you've paid it.

(do something) at time of (booking/registration)

This formal expression comes up in written legal agreements and policies. Use "at time of" to describe when something, like a payment, will happen. For example:

First and last months' rent is due at time of signing.

Your account will be charged at time of shipping.