IRS offices, known as Taxpayer Assistance Centers (TACs), typically open Monday through Friday from 8:30 a.m. to 4:30 p.m. local time. Phone lines for general taxpayer assistance operate Monday through Friday, 7 a.m. to 7 p.m. local time, while other specialized lines like Practitioner Priority Service run 8 a.m. to 8 p.m. These hours help accommodate tax-related inquiries efficiently, though appointments are often required for in-person visits.

Standard TAC Hours

Local IRS TACs follow a consistent schedule outside holidays and special events.

  • Monday–Friday : 8:30 a.m.–4:30 p.m. local time
  • Closed weekends, unless rare Saturday openings occur during peak tax season (e.g., past events like March Saturdays from 9 a.m.–4 p.m.)

Extended Tuesday/Thursday hours may apply at select locations through tax season.

Phone Support Details

Different IRS lines have tailored availability for 2026 operations.

  • Individual/business inquiries: 800-829-1040 or 800-829-4933, 7 a.m.–7 p.m. local time
  • Practitioner Priority Service: 866-860-4259, 8 a.m.–8 p.m. local time
  • International: 267-941-1000, 6 a.m.–11 p.m. ET

Call mid-week mornings to avoid peak wait times like Mondays or lunch hours.

Special Considerations

Saturday hours are not standard but have been offered periodically in prior years at 70+ locations for walk-ins without appointments. As of January 2026, check IRS.gov for updates, especially with tax season prep underway. Online services remain 24/7 via IRS.gov.

TL;DR : IRS TACs open weekdays 8:30 a.m.–4:30 p.m.; phone support 7 a.m.–7 p.m. Confirm locally and book appointments via 844-545-5640.

Information gathered from public forums or data available on the internet and portrayed here.