Independently Owned Assurance, Tax & Advisory Firm

Based in Pittsburgh, Pennsylvania, Sisterson has been dedicated to client success since 1926, nearly 100 years.

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Explore Practice Areas

Our professionals provide assurance, tax, and advisory services to clients locally, regionally and across the nation.

Audit & Other Assurance Services

Audit & Other Assurance Services

Tax Services

Tax Services

Advisory Services

Advisory Services

Industries & Specialties

Utilizing a niche team approach and organizing around your unique industry enables us to develop an in-depth understanding of your business.

Employee Benefit Plans

Employee Benefit Plans

Employee Benefit Plans

At Sisterson, we understand the complexities of employee benefit plans. 

Energy & Related Industries

Energy & Related Industries

Energy & Related Industries

As a firm, Sisterson has had the opportunity to work with energy-related organizations, including oil and gas companies for a number of years. 

Individuals & Trusts

Individuals & Trusts

Individuals & Trusts

An essential area of our practice is providing value-added services relevant to the needs of individuals and trusts. 

Manufacturing & Distribution

Manufacturing & Distribution

Manufacturing & Distribution

At Sisterson, we proudly serve manufacturing and distribution companies in a wide range of sizes and across numerous industry sectors. 

Not-For-Profit

Not-For-Profit

Not-For-Profit

Sisterson’s service to the not-for-profit sector began, and continues today, with our service to some of the largest private and family foundations in western Pennsylvania.

Private Investment Companies

Private Investment Companies

Private Investment Companies

Sisterson’s reputation as a respected and trusted advisor to private investment companies dates back to the firm’s founding in 1926. 

Real Estate

Real Estate

Real Estate

Service to real estate developers and investors has been a significant area of expertise within our firm for decades.

Emerging Growth

Start-ups & Technology

Start-ups & Technology

We have experience working with companies at all stages of growth and assisting businesses from "cradle to grave." 

Locally Owned, Serving Pittsburgh & Beyond

Locally Owned, Serving Pittsburgh & Beyond

Sisterson was founded in Pittsburgh, Pennsylvania, and our headquarters is still located downtown in the city's first skyscraper, the Grant Building. Our firm has lived through the Great Depresson, the rise and fall of the steel industry, and the emergence of the technology sector in our city. We proudly serve clients outside of the region and around the country but we are truly a Pittsburgh-based firm. 

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A Rich History of Success Since 1926

Today, we we stand atop the shoulders of our founders, our employees, and all of the valued clients we’ve served, as we prepare to usher in our next hundred years. We’re proud of our history. And we’re thrilled about our future.

Firm Culture

Firm Culture

One firm, one office, one mission. The employees and partners of Sisterson work out of one office, in the Grant Building, in downtown Pittsburgh.

Life at Sisterson

Life at Sisterson

Our collaborative environment, work-life balance and commitment to the non-profit community.

Meet our Team

Meet our Team

For 96 years, our professionals have served clients large and small with the same standard of service.

View Open Positions

View Open Positions

Sisterson is very interested in recruiting and retaining individuals committed to providing and supporting quality client service.

Featured Blog Posts

Round 2: 90-Day IRS Pre-Examination Compliance Pilot - Retirement Plans

Round 2: 90-Day IRS Pre-Examination Compliance Pilot - Retirement Plans

The IRS Employee Plans Division has officially started the second phase of the Pre-Examination Retirement Plan Compliance Program pilot.

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New Mileage Rates Announced

New Mileage Rates Announced

On December 15, 2023, the IRS released the optional standard mileage rates for 2024 in Notice 2024-8.

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New Rules on Part-Time Employee 401(k) Plan Participation Starting January 1, 2024

New Rules on Part-Time Employee 401(k) Plan Participation Starting January 1, 2024

The IRS issued proposed regulations on long-term, part-time employees' eligibility to participate in 401(k) plans.

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2024 Inflation Adjustments

2024 Inflation Adjustments

On November 9, 2023, the IRS issued Revenue Procedure 2023-34, announcing the 2024 inflation-adjusted amounts for various tax items.

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Contact Sisterson Today!