Xero or SAASU should be sufficient for a small business payroll and accounting system.

In a small business, you have a smaller team dealing with the day-to-day business operations, on top of whatever your business offering is! It makes sense to consolidate as many services as possible, and supercharge your efforts everywhere you can. 

We recommend combining your accounting and payroll software. 

On top of this, you can consolidate invoicing and reporting, and take advantage of third-party app integrations and accessibility extensions (such as mobile apps).

We’re a fan of Xero. It does everything a small business needs (and more) and has lots of integrations. It helps small businesses breeze through accounting and payroll tasks, and quickly get back to what they’re best at. As a cloud accounting tool, you don’t have to worry about updating your software or downloading it everywhere you need it. It’s available wherever you have an internet connection. 
 

You can learn more information on the different types of services offered by accounting firms.

Quickbooks Online has an excellent Payroll system included and is one of the most competitive in the market compared to other software options. 
The advantages of QBO's payroll

• Plus Version gives you up to 10 free staff and then a small fee per active staff thereafter
• WorkZone App for staff management  
• Easy to learn and automate
• Free quarterly Superannuation lodgement
• Single Touch Payroll compliant
• Submit ATO forms online
• Email and telephone support
• Timesheets

• Employee clock in / clock out
• Rostering
• Smart Award rate compliance