OFFICE: 208.699.3795


Leslie Gillis, Owner of Core Admin Support, has over 20 years of professional office experience with an emphasis in paralegal and accounting services. Leslie has her Associates of Applied Science Degree, as well as her Paralegal Certificate. She is also a Notary Public for the State of Idaho. She has extensive experience with Quickbooks Accounting Software, Microsoft-Outlook, Word, Excel, and office organization.

Leslie is professional, efficient, shows excellent attention to detail, and a powerful dedication to organization. As a life-long resident of North Idaho, Leslie enjoys boating, kayaking, hiking, jogging, and gardening. She is also a proud wife and mother of two active teenagers.

With enthusiasm for helping small business grow and succeed, Leslie’s mission in starting Core Admin Support is to provide small business owners with quality administrative support services in a timely, professional, and organized manner. 

How efficient could your small business be if you relied on Core Admin Support to manage accounts payable and accounts receivable, maintain business operating accounts by entering and coding all transactions, reconcile monthly bank statements, complete annual 1099 reports, and act as liaison between you and your CPA? Core Admin Support will handle it all.


Attempting to do payroll on your own for your small business could put you at risk of facing IRS penalties and fines, late tax filings, and unhappy employees. Core Admin Support will quickly process employee payroll, complete necessary payroll tax deposits, process quarterly and annual payroll tax reports, and prepare annual W-2 statements for your employees.


Experience is everything. Leslie with Core Admin Support will assist with preparing legal documentation, pleadings and correspondence, as well as expediting calendaring, scheduling, file management, and organization.


An efficient office is a profitable one. Organization is a key element to success. With Core Admin Support, you will maintain organized office spaces, desks, and filing systems.


If your office is in need of temporary Office Admin or quick fill-in assistance, Core Admin Support will step in and handle all of the above needs.


OFFICE: 208.699.3795

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