Instalment or Installment: Which Spelling Is Correct?

If you’ve ever wondered whether to write instalment or installment, you’re not alone. Both spellings appear in English, especially in writing about loans, purchases, subscriptions, and payments. The difference isn’t really about meaning or grammar; it is mainly a matter of regional spelling.

The short answer is simple: both “instalment” and “installment” are correct. Instalment is especially common in British English, while installment is the usual spelling in American English. The two forms have the same meaning and are used as nouns.

So, which one should you use? That depends largely on the variety of English you’re writing in and the audience you’re addressing.

Instalment or Installment: Which Is Correct?

Both instalment and installment are standard English spellings.

Spelling	Main usage	Meaning
Instalment	British English and some other varieties	One of a series of payments or parts
Installment	American English	One of a series of payments or parts

For example:

• British English: I paid for the laptop in monthly instalments.
• American English: I paid for the laptop in monthly installments.

The meaning does not change. The main difference is the spelling convention used by the variety of English.

What Does Instalment Mean?

Instalment is a noun referring to one of a series of payments made over a period of time. It can also refer to one part of something that is released or presented in stages.

For example:

• The final instalment of the loan is due next month.
• We bought the furniture and paid in monthly instalments.
• The next instalment of the series will be released Friday.

In British English, instalment is the usual spelling. Oxford and Cambridge both identify it as a British English form, with installment generally used in North American English.

What Does Installment Mean?

Installment has the same basic meaning as instalment. It is the standard spelling commonly used in American English.

It can describe:

1. A scheduled partial payment.
2. One part of something delivered or published in stages.

For example:

• I made the first installment on my car loan.
• The second installment of the documentary will air next week.
• She pays the rent in monthly installments.

Cambridge lists installment as the US spelling of instalment and gives the same core meanings for both forms.

Instalment or Installment: What’s the Difference?

There is no significant difference in meaning between the two spellings when you’re using the word to describe a payment or part of a series.

The key distinction is regional spelling.

Instalment

Use instalment when following British English spelling conventions.

Examples:

• The first instalment is due on Monday.
• We paid for the car in twelve instalments.
• She missed her monthly instalment.

Installment

Use installment when following American English spelling conventions.

Examples:

• The first installment is due on Monday.
• We paid for the car in twelve installments.
• She missed her monthly installment.

The choice is therefore usually determined by your intended audience rather than by grammar.

Is Instalment a Correct Spelling?

Yes. Instalment is a correct English spelling.

It is particularly associated with British English. You should not treat it as a misspelling simply because you are more familiar with installment.

For British English writing, such as a UK-focused website, formal document, or publication, instalment is a natural choice.

For example:

The customer agreed to pay the balance in six monthly instalments.

Is Installment a Correct Spelling?

Yes. Installment is also a correct English spelling.

It is the usual American spelling.

For example:

The customer agreed to pay the balance in six monthly installments.

Both sentences communicate the same idea. The spelling changes according to the English variety.

Instalment or Installment in British English

In British English, “instalment” is the usual spelling.

Examples include:

• monthly instalment
• loan instalment
• instalment payment
• instalment plan
• final instalment
• pay in instalments

For example:

The final instalment of the loan is due in December.

Oxford identifies instalment as especially British English and notes that North American English usually uses installment.

Instalment or Installment in American English

In American English, “installment” is the usual spelling.

Examples include:

• monthly installment
• installment payment
• installment plan
• final installment
• pay in installments

For example:

The final installment of the loan is due in December.

Cambridge identifies installment as the US spelling of instalment.

Instalment or Installment in Canadian English

Canadian English can sometimes be confusing because Canadian spelling includes influences from both British and American English.

Instalment is used in Canadian English, particularly in expressions such as instalment plan. Collins specifically identifies an instalment plan as a Canadian term and also lists the American form installment plan.

If you’re writing specifically for Canadians, instalment is a well-established Canadian spelling. However, actual usage can vary by publication, organization, and context, so consistency with the style guide you’re following is the safest approach.

Instalment Payment: What Does It Mean?

An instalment payment is one payment in a series of payments used to pay an amount gradually rather than all at once.

For example, suppose a product costs $1,200 and the buyer agrees to pay it over 12 months. Each scheduled payment may be described as an instalment payment.

In American English, the equivalent phrase is:

installment payment

Examples:

• The first instalment payment is due next week.
• You can make the purchase through monthly instalment payments.
• The customer missed an instalment payment.

American English:

• The first installment payment is due next week.
• You can make the purchase through monthly installment payments.
• The customer missed an installment payment.

Is Instalment or Installment a Grammar Difference?

No. Instalment and installment are not different grammatical forms.

They are spelling variants of the same noun.

Both can be:

• singular nouns
• plural nouns
• modified by adjectives
• used in financial contexts
• used to describe parts of a series

For example:

Singular:

The first instalment is due tomorrow.

Plural:

The remaining instalments are due each month.

In American English:

The first installment is due tomorrow.

The remaining installments are due each month.

The grammar remains the same; only the spelling changes.

Instalment or Installment: Pronunciation

The two forms are generally pronounced the same or very similarly.

A common pronunciation is approximately:

in-STAWL-mənt

The stress falls on the second syllable:

in-STAWL-ment

Cambridge gives British pronunciation around /ɪnˈstɔːl.mənt/ and an American pronunciation around /ɪnˈstɑːl.mənt/.

The exact vowel sound can vary with the speaker’s accent, but the spelling difference does not create a major difference in pronunciation.

Syllable Breakdown

Instalment:

in-STAWL-ment

Installment:

in-STAWL-ment

For English learners, the most useful point to remember is that the two spellings normally refer to the same word and are not pronounced as two completely different words.

Instalment or Installment Examples

Here are natural examples showing how both spellings work.

Examples With “Instalment”

• The first instalment is due at the end of the month.
• We paid for the sofa in six monthly instalments.
• She made her final instalment yesterday.
• The bank offers flexible instalment options.
• The next instalment of the series will be published soon.
• He missed two instalments on his loan.
• You can pay the fee in three instalments.
• The final instalment brought the total payment to £5,000.
• They agreed on a monthly instalment plan.
• The company allows customers to spread the cost over several instalments.

Examples With “Installment”

• The first installment is due at the end of the month.
• We paid for the sofa in six monthly installments.
• She made her final installment yesterday.
• The bank offers flexible installment options.
• The next installment of the series will be published soon.
• He missed two installments on his loan.
• You can pay the fee in three installments.
• The final installment brought the total payment to $5,000.
• They agreed on a monthly installment plan.
• The company allows customers to spread the cost over several installments.

Instalment or Installment in a Sentence

Both forms can be used naturally in the same types of sentences.

British English

I paid the first instalment of the loan yesterday.

The final instalment will be due in six months.

The magazine’s next instalment will appear next week.

American English

I paid the first installment of the loan yesterday.

The final installment will be due in six months.

The magazine’s next installment will appear next week.

The sentence structure doesn’t change. Only the regional spelling changes.

Instalment or Installment Plan

An instalment plan allows a customer to pay for something through a series of payments.

In British English, you may see:

The retailer offers an instalment plan.

In American English, you will usually see:

The retailer offers an installment plan.

The same spelling distinction applies to related phrases such as instalment payment and installment payment.

Instalment or Installment for Loans

Both spellings are appropriate depending on the English variety.

British English:

The borrower must make monthly loan instalments.

American English:

The borrower must make monthly loan installments.

The term refers to one scheduled portion of the amount being repaid.

It’s also worth distinguishing instalment/installment from the broader word payment. A payment can be any amount paid, while an instalment or installment usually refers to one part of a larger amount divided into multiple payments.

Instalment or Installment or Installation

These words can look confusing because installment resembles installation, but they do not normally mean the same thing.

Word	Meaning	Example
Instalment	A scheduled part of a payment or series	I paid the final instalment.
Installment	US spelling of instalment	I paid the final installment.
Installation	The act or process of putting something in place	The installation took two hours.

For example:

The final instalment of the loan is due today.

But:

The installation of the new software is complete.

Do not substitute installation for instalment/installment when you mean a partial payment.

Common Mistakes With Instalment or Installment

Mistake 1: Treating Instalment as Incorrect

Incorrect assumption:

Instalment is a misspelling of installment.

Better understanding:

Instalment is a standard spelling, particularly in British English.

The spelling with one l after the first syllable is not automatically wrong.

Mistake 2: Treating Installment as Incorrect

Incorrect assumption:

Installment is wrong because British English uses instalment.

Better understanding:

Installment is the standard American spelling.

Your choice should match the variety of English you’re using.

Mistake 3: Confusing Installment With Installation

Incorrect:

I paid the final installation of my loan.

Correct:

I paid the final installment of my loan.

British English:

I paid the final instalment of my loan.

Installation refers to putting equipment, software, or something else into position or operation. It does not normally mean a scheduled payment.

Mistake 4: Mixing Spelling Styles

A document can become inconsistent if it switches randomly between British and American spelling.

For example:

The first instalment is due today, and the second installment is due next month.

This isn’t a meaningful difference in grammar, but it is inconsistent spelling.

A cleaner approach is to choose one variety and use it consistently:

The first instalment is due today, and the second instalment is due next month.

Or:

The first installment is due today, and the second installment is due next month.

Instalment or Installment: Singular and Plural

The plural forms follow the same regional spelling distinction.

British English

Singular: instalment

Plural: instalments

Example:

I have paid three instalments so far.

American English

Singular: installment

Plural: installments

Example:

I have paid three installments so far.

The plural ending is simply -s in both varieties.

Is “Instalments” Correct?

Yes. Instalments is the plural form of instalment.

Example:

The remaining instalments must be paid by the end of the year.

It is particularly appropriate in British English and is also used in other varieties that follow this spelling.

The American equivalent is:

The remaining installments must be paid by the end of the year.

Is “Installments” Correct?

Yes. Installments is the plural form of installment.

Example:

The remaining installments must be paid by the end of the year.

This is the normal plural spelling in American English.

Which Spelling Should You Use?

The simplest rule is to match the spelling to your audience.

• Writing primarily for a British English audience? Use instalment.
• Writing primarily for an American English audience? Use installment.
• Writing for a Canadian audience? Instalment is an established Canadian form, particularly in expressions such as instalment plan, but follow the style guide of the organization or publication you’re writing for.
• Writing for an international audience? Either can work, but consistency matters more than choosing one arbitrarily.

If your website consistently follows British spelling, use instalment throughout. If it follows American spelling, use installment throughout.

Frequently Asked Questions

Is instalment or installment correct?

Both are correct. Instalment is especially common in British English, while installment is the usual American spelling. They have the same meaning.

Is instalment British or American?

Instalment is mainly associated with British English. American English generally uses installment.

Is installment British or American?

Installment is the usual American spelling. British English generally prefers instalment.

Does instalment mean payment?

Yes. An instalment can mean one of a series of payments made over time. The word can also describe one part of something released or presented in stages.

What is an instalment payment?

An instalment payment is one payment in a series used to pay an amount gradually. For example, a loan might be repaid through 12 monthly instalments.

Is installment a misspelling?

No. Installment is not a misspelling. It is the standard American spelling of the word.

Is instalment a misspelling?

No. Instalment is not a misspelling. It is a standard spelling, particularly in British English.

Is instalment or installment used in Canada?

Both forms can be encountered, but instalment is an established Canadian spelling, including in the expression instalment plan. Usage can vary by organization and style guide.

Is instalment the same as installment?

Yes. In the payment or series-related sense, they are spelling variants of the same noun. The main difference is regional spelling.

Is installment the same as installation?

No. Installment refers to a portion of a payment or a part of a series, while installation refers to the act or process of installing something.

Conclusion

So, instalment or installment? Both are correct. The difference is primarily regional rather than grammatical.

Use instalment when following British English spelling conventions, and use installment when following American English conventions. In Canadian English, instalment is also an established form, although style and usage can vary.

The most important thing is to stay consistent. If you write instalment, use instalments for the plural. If you choose installment, use installments.

And remember the distinction from installation: an instalment or installment is a payment or part of a series, while an installation is the process of putting something in place.