Ten companies and five people have been fined over income tax and national insurance offences.
The cases were heard by magistrates at Douglas Courthouse.
Eight firms failed to pay tax or national insurance on time and were fined a total of £16,150, while one didn't submit an annual return on time and was fined £500 and another failed to comply with a notice to submit company tax returns and was given a £1,150 fine.
Four people were convicted of not submitting their tax form on time and were fined £1,650 in total, while one person didn't comply with a notice to submit accounts and was fined £1,100.
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