I don't think "allowed" is the right way to think about it (and your quotation marks suggest that probably you don't either). If you mean something like "what position do other reasonable people take?" or "what is the range of options that won't make other people who think of themselves as EAs disapprove of me?", I have no information on anyone else's positions but my own is something like this:

• If you are having difficulty feeding yourself healthily, paying for somewhere to live that isn't falling down, etc., then feel free not to give anything.
• Otherwise, I think it's psychologically valuable to keep up the habit of giving something, even if it's very little.
• If you expect to be substantially better off in the future than you are now, there's a lot to be said for optimizing lifetime income and aiming to give some fraction of that rather than feeling guilty about not giving a lot now. If hoarding some for now gives you more stability later, that's probably better for everyone.
• Once you're reasonably comfortable financially, I think the traditional figure of 10% is a reasonable benchmark; you can answer the question "10% of what?" in various different ways, all somewhat defensible and leading to substantially varying levels of giving.
• There are people who give quite a lot more. No one will think ill of you for not being one of them.