I don't mean to be rude, but even if that's what you used to do, it doesn't mean it's a good idea. Quite to the contrary; unless you have a few months of "spare change" on hand to weather a stiffed paycheck, that happening just once can cause you serious problems. So like I said earlier, I'd recommend making a contract, or using a deposit system (half up front or even a third up front; something that will weed out most people out to cheat you). Of course, if you do work for people you've been working with multiple times and that you trust, it's safer to skip such formalities. But it's not something I would do with absolute strangers.
Of course, it depends on the size of the work; if we're talking a job that I'll charge 30$ for, then creating the paperwork will probably cost me more in work hours than just winging it and taking a chance.
Funny how "not to be rude" statements normally come off as such-just like "With all due respect" is usually followed by the most DIS respectful statement that can be made in that situation... Heh... Oh well, that's life, right?
Try running a service business where you ask for payment up front.
The art and commissioned music world may work differently, but when you're wiring up people's houses, installing plumbing, or doing a massive landscape job, they're NOT going to pay you up front. Hell, even when I was in a band, we didn't get paid BEFORE the show. We had to perform, and we'd damn sure better put on a good show!
Sure, once in a while you'll get a fella like the guy my da and I installed a security system and lights for-paid us CASH after our first day of work, for the value of the entire estimate, and said "If it runs over, come see me." You get 'em like that-but the fact is, in THAT kind of industry, when you're charging per hour of labor plus costs of materials...
But I tell ya this-we followed a set model, and it worked damn well-only had one business and one individual ever stiff us-the business is now OUT of business, and the individual, who cares, as he lives half a state away anyway?
Anyway, as is generally the rule, take everything I say as my opinion on the matter-your mileage may vary, you may find a different system that works, yada yada yada...