To
(Company Name)
(Address)

Sir,

The undersigned would like to intimate you that he no longer finds it viable doing business with your esteemed organisation as the operating margin offered by your organisation is not profitable. Moreover, with the compe­tition warming up, he has got better offers from other organisations which he finds more profitable.

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Under these circumstances, he has decided to have no further busi­ness association with your organisation. We are hereby enclosing a draft for ____________ (Amount) (In Words) which takes care of your outstanding dues. You are re­quested to issue a receipt for the same and annul the business contract.

Terminating

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Thanking You

Yours Faithfully,
(Company Name)
(Address)