How many consecutive years can a company claim net operating losses until the IRS get concerned ?

Answer 1

As many years as the company has loses. Aren't they real loses?

Answer 2

You won't raise red flags till you hit a loss four years out of five. At that point they start to really wonder why you're sticking it out at a loss for that long.

One or two years, no problem. Many start ups don't show a profit for the first two,or even three years. But four out of five, that'll get you audited.