
Overwhelmed
I started working at my position for 1.5yrs and things are getting to be too much now. When I started I only had 25 clients and a small portion of side work like invoicing for the financial department. Now that has increase and I have 44 clients so the work load has increase by like 56%. I feel like I am doing the job of 2 people and trying to cram it all into a week. How should I tell them I can;t do it all, without sounding incompetent? Or do I just move on?

I'm with Mrs Hildebrand on this one. It's the most "Proffesional" attitude and suggestion. You gotta find a way to ,(like the quarterly report she's advising), to show them just exactly how this could effect the financial increase unless they hire a second hand "thus giving the company a better chance to see even greater cash flow by gaining even more clients with two operating employee's". It's like they say "Nothing Personal, Just Strictly Business" So!, Don't make this sound personal toward you, just show them the business facts!

So, this is how you feel about 19 additional clients...
OVERWHELMED!
Hm! ... the Problem: "increased 25 to 44 clients so the workload has increased by like 56%."
56% is overwhelming after 1.5yrs ....really, ...really!

It is not about being incompetent. It is about you being honest with your employer about the workload. Sit down and discuss it with them. It will be ok.

Talk with management about workload. Sometimes being overwhelmed means progression within the company.

I would just tell them the truth. I was working a full time job with you with 22 clients..now I have 56 and it is too much. You need to find help for 25 of these clients..that would only be fair..and if they are not compensating you for the bigger work load..I would tell them they should have been compensating you accordingly ..if they have I would tell them the extra money isn't worth it as you have no spare time for your family or yourself.

My suggestion first isn't to move on. Appeal to your employer that they could increase production and get more clients in if they hired or trained someone to work with you. Now I admit I don't know how to do this but you cannot prove that you are incompetent to anyone because you are doing the job. I have been in your shoes recently and I showed them the benefits of having 2 people doing the job rather than one person

Put together a quick spreadsheet, or a word document. That shows I started this month year, I had this many clients. And then show quarter by quarter your increase of clients you have brought on board. A quick chart is worth a Thousand words on this.
Then ask what is most important, bringing on more new clients which increase bottom profit number. But you understand the need to service them as well. Ask the boss for suggestions on how to juggle this part. Or could some of the servicing of clients already on board be handled by another area, a new person?
You need input, on what they want to be done. But make sure you present them with all you are doing. So they see the Win-Win position. Good Luck you got this.

Rip off the bandaid just tell them because if you don’t your only hurting yourself

Yes, something needs to change.
I would be honest with your employer, which a lot of people have already stated. If you feel overloaded & like you can't service them properly, your superiors need to know this.