The first "big" thing my son bought with his own money was 1/2 the cost of our dog for 6 months. He wanted a puppy from the age of 3. I told him that if he could save up half the cost of adoption fees, and 6 mo of vet bills, food, and supplies... that we would get one. It took him 2 years to save up $400.
The next "big" thing was his laptop. That took him 3 years. He had an old handmedown PC but he wanted a macbook. No worries. Same deal applies.
That's the 'deal'. If he can save up half for anything big, I/we would match it.
As far as smaller stuff... he's allowed to buy anything he's allowed to have already with his own money.
He's ALSO required to pay certain bills/etc. At age 9 he's responsible for (and has been for a couple of years)
- Cellphone Bill ($10 per month plus any fees)
- xBox Live account
- Birthday presents for his friends
Until he was 5, he got all of our spare change. It started because I'm always dropping coins when I pull down my pants to go to the bathroom, but it became all our spare (metal) change. He not only saved up $400 in 2 years (spare change adds up!), but also enough to be buying himself strawberry frappucinos, donating to various things (he has a thing about the summer food program for kids), and going dutch for lunch. He and I have a standard biweekly lunch out (we'd walk down for sushi usually), but if he wanted to go get something on top of that, we'd split the tab. If *I* wanted to go out on top of that I treated.
AFTER he was 5, I instituted a fairly uncommon allowance policy.
The end goal is that by 14.5 he'd be paying for ALL of his needs out of his own money. This includes school supplies, clothes, sports & extracurriculars, entertainment, etc. EVERYTHING that I'd be spending on him anyway. In addition to include a portion of the household bills (rent, utilities, groceries, etc.). So on the surface it looks like rather a lot (about $1000 a month today, probably more in 5 years) but
a) It's what already would be being spent
b) 4/5s of it would be turned right back around to be meeting responsibilities
c) the remaining 1/5th (right now about 200) would have to be carefully budgeted out to meet his WANTS after taking care of his needs.
The entire aim is to teach financial responsibility. To make these things drop dead normal... so that when he's out on his own he already has a couple years of solid working knowledge of dealing with money and bills. I do NOT want him only in the habit of spending his money on 'fun' stuff. I want him in the habit of looking at the big picture.
So every half birthday, he has both an allowance increase and a responsibility increase. He was in the hospital for a long time last year so the schedule is about a year behind (aka he was making $15 a week when he was 9, and should be making $25 now... but it's still at $15).