Tax help. In-person VITA services are available by appointment only. IRS-certified volunteers help taxpayers who earn up to $58K per year.  Visit www.fairfaxcounty.gov and search “VITA” for locations and hours. Appointments can be made online, by email at DFSVITA@fairfaxcounty.gov or by phone at 703-533-5702 (please leave a message). Some services may be available by phone.  Adults.