1. Consider others’ financial situations when planning.
If you know that your friend is saving money for a vacation or paying off some debt, you shouldn't insist on going somewhere expensive. It would be a better idea to ask them where they feel like going to prevent them outright refusing due to financial constraints.
2. Consider everyone's budget if you want to chip in.
If you're collecting money to buy someone a gift, don’t assume that everyone can afford to pay the same amount. Such collections may come as a nasty shock to some people. That's why it's best to figure out a sum which would be good for everyone, or simply to ask everyone to contribute however much they feel comfortable with.
3. Don’t comment on someone’s financial decisions.
It’s very rude to discuss what others spend their hard-earned money on, and it might just end up altering their attitude toward you. Even if you’re very good friends, it still may be possible that you’re not entirely aware of the details of their financial situation, so criticizing them for their choices is never a good idea.
4. Make sure that restaurant bills are split fairly.
When it’s time to split the bill, ensure there are no people at the table who didn’t order a single thing. A person could not have eaten as much or could have drank a single beer instead of a couple of pricey cocktails. It’s often a lot better when everybody pays only for what they are actually willing to pay for. This shouldn't be too tricky, seeing how everyone has a calculator built into their smartphone nowadays.
5. If you use a friend's service, pay them as if they were any other professional.
Your relationship with your friend should not automatically entitle you to a discount. Regardless of your friendship, a person who spends time and resources to help you out should certainly be compensated for their work.
6. Don’t ask how much somebody spent on something.
Keep in mind that questions about purchases or rent are able to make people feel very awkward. If you’re really that curious about it, you can always check online when you're alone. If people ask you such questions, remember that you have no obligation to answer them.
7. Don’t complain about your financial problems to friends who earn less.
You’ve been longing for a shiny new TV for quite a while now, but thanks to a sudden price hike, you're going to have to wait a little bit longer. Granted, it’s unpleasant, but telling your friend (who has been saving up to buy a basic microwave for the last 4 months) about it will only serve to damage your relationship.
8. Pay back your debts on time.
If you borrow some money, you should inform the lender of when you’re planning to pay it back. Keep this deadline in mind, and try your best to stick to it. If you are unsure of when you'll be able to pay it back, then make sure that this is clear from the start.
9. Don’t feel obliged to lend anyone money.
Some people don’t lend money to relatives and friends, and will certainly have their reasons. In fact, it’s a lot better to refuse than to lose a friend due to awkward money problems. You don't need to come up with any form of justification either.
10. Don’t lecture others.
Even if your intentions are good, it’s better to stay silent when it comes to other people's money. You might know how to save and make money, but such advice is only ever appreciated when it’s asked for!