Even when your design business gets to the point where you can hire someone to take care of payments and keep an eye on the finances, don’t. Better to do that part yourself. Your accountant is only there to check everything and to make sure that the taxman gets paid what’s due to him. Only you as the company owner can/should monitor the financial health of the company. There is of course a point where it makes sense to hire a financial manager, but don’t rush. Chances are that you are nowhere near that point. Get to 100+ employees first.