I can replace tires, tubes, cassette, tape and chain under $100. Heck, say $100 for mid-level stuff. So, assuming I wear all those out every year, $100 a year or less.
Brake pads vary wildly on how fast they wear based on style and type of riding, so toss in another $20-30 if you want nice ones (I do). I'll just assume an average of one set a year, some may go many seasons, some may need replaced a couple times a year.
How you amortize the cost of your bike over the years is up to you.
My clothing is really no more expensive than my regular clothes, and I often ride in regular clothes, so to me those costs are negligible.
Past that, my biggest cycling related expenses are a) the beer at the breweries I cycle regularly to, and b) entry fees for the mass rides that the fiancee loves. Both probably range in the many hundreds of dollars a year, but both are personal to me expenses which you may vary wildly on!