Benefited vs. Benefitted: Single or Double t?

small_letter_tI’ve written in past blogs about whether you should double the t before adding ed or ing to benefit.

Because I often see benefitted and benefitting, I decided it was time to check other grammar sources:

The Associated Press Stylebook
The Chicago Manual of Style
Webster’s New World College Dictionary

All five agree that you generally double the final consonant and add ed or ing to words that end with a consonant:

hop: The rabbit hopped / is hopping across the driveway.
beg: Ella begged / is begging to go to the movie.
permit: Ella’s dad permitted / is permitting her to go.

But all also agree that it’s different with benefit:

The puppy benefited / is benefiting from nutritious food.
You benefited / are benefiting from the stock market rise. and consider both versions acceptable: benefited or benefitted, and benefiting or benefitting. But because both sites list the single t version first, I interpret that as the preferred usage.

Microsoft Word’s spellcheck allows either form: benefited or benefitted and benefiting or benefitting.

Although I’m starting to see more of the double-t version, the single-forms have prevailed thus far.

According to

If you are in favor of spelling the past tense of benefit with one t, you are part of the majority in the United States. However, if you think that the final t should be doubled, you are definitely not alone. You can spell it either way, but be prepared; your choice might result in a friendly debate!

If you’re a student, you might already have discovered which version your teacher / professor prefers. If you’re a business professional, see if your organization has a style guide for these kinds of questions.

Have questions on word or punctuation usage? Leave a comment or send me an email.

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Kathy Watson

Kathy Watson has a love/hate relationship with grammar; she loves words and the punctuation that helps them make sense, yet she hates those pesky rules. A self-proclaimed ruthless editor, she prefers standard usage guidelines of The Associated Press Stylebook. Her easy-to-use Grammar for People Who Hate Rules helps people write and speak with authority and confidence. She encourages and welcomes questions and comments. (Email)