Just curious, how long should I keep a customer's information after they cancel an account with me?
I'm just starting out so I haven't even got my first customer, but I know this will be something I need to know for the future.

Most larger companies I know will keep the information indefinitely. Even if the data base they are using gets cleaned out they archive the old stuff. I would do the same if I were you. Doesn't mean you have to have it easily accessible when it gets old.

I'd agree with keeping the information indefinitely, however, as a second option, I'd keep it as long as it's necessary for your taxing authority. US IRS requirements, if memory serves, would be 5 years at a minimum. You'd need to verify that though.

Thanks for the advice and it makes sense. It seems like it can't hurt to keep it indefinitely and I hadn't even yet thought through the IRS requirements. I'll have to check into that a little more.

I'd keep it forever, you can "market" to them for a certain period of time after they leave you as well.

for me?just save it as long as it is important and for future references. .

Forever, since you never know. But this also depend of the legislation from your country. I delete the old data after couple of months max 1 year.