Business is a give-and-take experience. Having a healthy relationship with your clients is necessary for your business to succeed. There’s the keyword: “healthy.” Both you and your client have to establish a healthy relationship on both sides.

Obviously you have separate goals, but the end result should benefit both parties. Yet we’ve all been taught that the customer is always right. But if the relationship becomes toxic and the customer becomes highly unprofitable, it is wise to walk away.

Let’s take a look at 4 examples of red-flag client behaviors that could signal a potentially toxic client:

1. Psycho dialer (or emailer)

An overly communicative client is someone who contacts you way too much. Communication is key for a healthy relationship. However, just like a romantic relationship, you need your own space and time.

If they consistently call late at night and send too many emails, texts or voicemails that could be handled during business hours — these are all bad signs. If it’s a red flag in a relationship, it’s a red flag in business.

Clients should recognize that you have other clients as well. Prioritizing one client sets you up to let them down later when you can’t afford to pay as much attention to them. This can happen for many reasons, from an increase in business to the realization that you’ve given too much to this client and are now stuck.

2. Unrealistic time expectations

They say time is money. However, not everyone wants to pay for all of that time consistently, though. If this comes up with a client, it can be a cause for concern. In this day and age of free music and free news, people often have unfair expectations of free (or very cheap) services.

They wouldn’t want this turned back upon them if they owned a business, though, and this is your company. Be firm and clearly express how much time you can spend on a specific project and what that will cost. This leads directly into the next point.

3. Freebie expectations

Clients reach out to you for services you can provide that they can’t do on their own. Because of this, they should respect that fact instead of constantly trying to get “deals”.

For example, we recently had a legal transcription client who asked for a lower rate than our initial quote. When we hesitated slightly, he spotted an opening. He refused to commit until he received a free trial. We acquiesced, even though his needs were low volume and the free trial is typically for high-volume, long-term clients.

Within three months, he was back on the phone, trying to get another discount. At this point, we suggested he move to another firm with lower prices. It had become clear that price and not quality was a priority to him, so it was not worth our time. At his rates and volume, our profit margin was too narrow and our business interests did not match up.

That’s not to say, however, that you shouldn’t make small concessions or be lenient with your time or pricing — especially if you’ve established a relationship.

4. Overly aggressive demands

Never let business matters be conducted in an aggressive tone.

For instance, a (former) medical transcription client called so much that our office personnel began to noticeably lose productivity. Not only that, they were so rude that our office staff started to avoid answering their calls. The situation became so bad that after internal discussions, we set up a spreadsheet to track the calls.

Three months and many nasty calls later, the client was sent the spreadsheet documenting their calls and issues, our response, and a request for them to find a new transcription company. We were finally free of their toxicity when they found a new company.

Every customer isn’t valuable

It’s key to remember that not every client is valuable. There are some that you can not only live without, but would be better off doing so. If you find yourself frequently thinking negatively about a client, it might be time to reconsider your relationship with them.

Candice Galek said it well in an Inc. article: “Every customer isn’t valuable — there are some that we can certainly live without. Like the customers who are headaches for your company, for example. The ones who won’t lead to any more referrals or sales, and who give your staff trouble time and again.”

Remember that you can always find new clients. You can’t, however, recover wasted time or image trying to satisfy a client who will never be satisfied. You deserve the respect and the satisfaction of fair compensation for all your hard work, and you should be confident your prices are already very fair.

This article has been edited. 

Ben Walker is the CEO for Transcription Outsourcing, LLC and has made contributions to Entrepreneur Magazine, The Associated Press, & Inc. A version of this article originally appeared here. Connect with @benjaminkwalker on Twitter.

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