The plural variation is more common according to Google ngram. It is also offered as an example in Cambridge"s dictionary.

You are watching: I have your best interest at heart

It"s in his interests to save cautious records

However before, I would certainly prefer to know whether the plural and also the singular versions are equally perfect to usage without sounding unnatural.

If there is any kind of difference, of course I would choose to learn about it.

Singular:

It"s/I"m acting in your finest interest

Plural:

It"s/I"m acting in your best interests

Google ngram is offered for both through "your" and also without:

your best interemainder,your best interests,finest interest,best interests

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asked Dec 16 "14 at 21:14
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From the interpretation of the word interemainder in Macmillan"s Dictionary

Sense 5

an advantage or benefit to someone or something

be in your (own) interest(s) (=carry an advantage or benefit):

It"s in their very own interest to corun.

have someone"s (best) interests at heart (=desire to aid them):

He clintends he has actually only my best interests at heart.

be in someone"s/something"s (best) interest(s) (=lug an advantage or benefit):

The president doesn"t think the plan is in the finest interemainder of the firm.

However, The FreeDictionary provides two versions for the idiom "... at heart"

have actually someone"s best interest(s) at heart

to make decisions based on someone"s finest interests.

I understand she was just doing what would benefit her, yet she shelp she had actually my ideal interests at heart.

And from Oxford Dictionaries, it seems that interests is mainly even more prevalent.

in the interests (or interest) of something

2 For the benefit of:

in the interests of security we are maintaining the indevelopment confidential

One such principle holds that area is to be explored and provided ‘for the benefit and in the interests of all countries.’

We are doing so because it is in our ideal interests and also in the interests of our citizens.

The Government need to act in their interests and not simply in the interests of the elite who can afford to develop nursing residences.

It appears it is a question that may bug some native speakers too!

A pertinent question on the Web: question for grammar junkies.....

Is it... "..in the child"s best interest?" or "...in the child"s best interests?"

Does the answer readjust if you adjust "child" to "children?"

NB: Because the proof remained in Macmillan"s dictionary currently, I need to consult more than one dictionary from currently on. In truth, many kind of times I uncover clearer answers and also definitely some examples once they are not offered in Cambridge"s. I choose Cambridge"s look and also feel more and also it is a decent work-related to be hoswarm.

See more: Which Of The Following Words Is An Antonym For Friendly? ? 73 Synonyms & Antonyms For Friendly

Edit:This one is also even more interesting!

in the interemainder v. in the interests

Edit 2

With this, the article must pertained to an end

Best interemainder or interests?MIND OUR ENGLISH

The Star Online, Thursday April 10, 2008

IS IT grammatically correct to say “I have actually your ideal interemainder at heart” or “I have actually your ideal interests at heart”?

Assuming both of the above are correct, in the adhering to sentence, which would certainly you say functions better?

“Your priorities are necessary so believe us as soon as we say that we have actually your ideal interest(s) at heart.”

– Viv

1) Both are grammatically correct, however once “interest” indicates “advantage” or “benefit”, the plural “interests” is more regularly supplied.