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Prepositions after adjectives

Conditional on or conditional upon?

Both conditional on and conditional upon are correct. Conditional upon is more formal, especially in legal and business English.

Quick answer

Conditional on vs. conditional upon

Use conditional on in everyday and professional English. Use conditional upon in more formal or legal contexts. Both mean depending on a condition being met.

Approval is conditional on funding.
The offer is conditional upon a background check.
Access is conditional on registration.

Choose the pattern by meaning

These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.

1
conditional on + requirement

Showing a necessary condition

Conditional on is the standard everyday pattern for requirements or dependencies.

Payment is conditional on delivery.
Entry is conditional on prior approval.
2
conditional upon + formal condition

Using formal or legal style

Conditional upon is more formal and common in contracts, policies, and official writing.

The agreement is conditional upon shareholder consent.
Release is conditional upon compliance with the rules.
3
conditional for + purpose

Adding context or purpose

For can introduce a purpose or category, but it is not a fixed complement after conditional.

The waiver is conditional for international applicants.
Special access is conditional for emergency cases.

See the difference in context

The same subject can take different constructions because each sentence answers a different question.

Construction
Example
Meaning
conditional on
The grant is conditional on final approval.
Standard and widely used for dependencies or requirements.
conditional upon
The merger is conditional upon regulatory approval.
More formal version of conditional on.
conditional for
The discount is conditional for members only.
Not a standard adjective-preposition pattern; wording is often improved with on.

Common mistakes

Some combinations appear in real text but do not mean what learners often assume.

Using conditional for instead of conditional on

Use on to introduce the required condition.

✕ Access is conditional for payment. ✓ Access is conditional on payment.

Overusing conditional upon in casual writing

Upon is correct but often sounds overly formal in everyday contexts.

✕ Dinner is conditional upon finishing homework. ✓ Dinner is conditional on finishing homework.

Leaving out the condition

Conditional usually needs a condition introduced by on or upon.

✕ The offer is conditional. ✓ The offer is conditional on approval.

Quick practice

Choose the expression that matches the intended meaning.

1. The scholarship is conditional ___ academic performance.
2. The contract is conditional ___ board approval.
3. Access is conditional ___ completing the form.

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Frequently asked questions

Are conditional on and conditional upon both correct?

Yes. They have the same meaning, but upon is more formal.

Which form is better for everyday English?

Conditional on is more natural in everyday communication.

Is conditional for correct?

Usually no. English normally uses conditional on or conditional upon to introduce the requirement.

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