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New York’s Trusted Partner for Bookkeeping, Payroll & Tax Support

 Helping businesses, CPAs, and accounting firms across New York streamline finances with accuracy and speed.

About Us

Smart Accounting & Tax Support for New York Businesses

We provide reliable bookkeeping, payroll, and tax preparation support tailored for businesses and CPA firms across New York.
Our team focuses on accuracy, compliance, and timely delivery, ensuring your financial operations run smoothly.
From managing daily books to handling complex tax filings, we act as an extended arm of your business.
With proven systems and industry-leading tools, we simplify accounting so you can focus on growth.

Comprehensive Accounting & Tax Support Services

From daily bookkeeping to complex tax preparation, we deliver end-to-end financial support for New York businesses and CPA firms.
Our services are designed to improve accuracy, reduce workload, and ensure full compliance with US regulations.

Bookkeeping Services

Accurate and organized financial records using tools , tailored for New York businesses.

Payroll Processing

End-to-end payroll management including salary processing, tax filings, and compliance.

Tax Preparation Services

Professional tax filing support ensuring IRS compliance and maximum accuracy.

CPA & Accounting Support

Dedicated backend support for CPAs and accounting firms to manage workloads efficiently during peak tax seasons.

Proven Results Across 650+ Clients

We’ve successfully supported businesses, startups, and CPA firms across New York with reliable bookkeeping, payroll, and tax services.
Our growing portfolio reflects consistent accuracy, long-term client relationships, and scalable financial solutions.

Top 10 Best Bookkeeping Firms in Huntington, NY for Small Businesses

Huntington has a diverse local business community that includes restaurants,…

Top 10 Best Bookkeeping Firms in Melville, NY for Small Businesses

Melville is an important commercial center for Long Island businesses.…

Top 10 Best Bookkeeping Firms in Hicksville, NY for Small Businesses

Hicksville is a centrally located Nassau County community within the…

What Makes us stand out

Proven Experience & Scale

With 6+ years of experience and 650+ clients served, we bring deep industry knowledge to every engagement. Our systems are built to handle volume without compromising accuracy. From startups to CPA firms, we scale with your business needs.

Accuracy & Compliance First

We follow strict processes aligned with IRS and New York state regulations. Every entry, report, and filing is double-checked for precision. This ensures your business stays compliant and audit-ready at all times.

Technology-Driven Approach

We work with leading tools. Our tech-enabled workflows improve speed, reduce errors, and enhance reporting. This allows us to deliver faster turnaround with consistent quality.

Built on Accuracy, Speed & Long-Term Trust

Our Focus

Accuracy You Can Rely On

We maintain strict quality checks across every financial record and report. Our team ensures error-free bookkeeping, payroll, and tax filings. This keeps your business compliant and audit-ready at all times.

Fast & Scalable Delivery

Our streamlined processes allow quick turnaround without compromising quality. We efficiently handle high volumes, including 450+ payrolls every month. As your business grows, our support scales seamlessly with you.

Blog

Insights, Updates & Accounting Tips for New York Businesses

Top 10 Best Bookkeeping Firms in Huntington, NY for Small Businesses

Huntington has a diverse local business community that includes restaurants, retailers, law firms, contractors, medical practices, real estate businesses, consultants, nonprofits, hospitality companies, and professional service providers. These businesses may have different customers and operating models, but they all need reliable financial records. Choosing the best bookkeeping firm in Huntington, NY can help a business […]

Top 10 Best Bookkeeping Firms in Melville, NY for Small Businesses

Melville is an important commercial center for Long Island businesses. The area is home to corporate offices, professional service companies, healthcare organizations, manufacturers, distributors, technology businesses, construction companies, financial firms, law offices, and growing small businesses. These companies may differ in size and industry, but they share one essential requirement: accurate and current financial records. […]

Top 10 Best Bookkeeping Firms in Hicksville, NY for Small Businesses

Hicksville is a centrally located Nassau County community within the Town of Oyster Bay. Its accessibility, transportation connections, commercial corridors, and proximity to other major Long Island business areas make it a practical location for restaurants, retailers, medical practices, contractors, professional offices, consultants, and family-owned companies. Regardless of industry, these businesses need reliable financial records. […]

What Our Clients Say

Mezier CPA PLLC had the pleasure of working with Global Outsourcing Service during the recent tax season, and we were extremely satisfied with the quality of their work and professionalism. Their team provided reliable and timely support, helping us manage a high volume of tax returns while maintaining accuracy and efficiency. They were responsive, detail-oriented, and consistently met our deadlines, which allowed us to better serve our clients during our busiest time of the year. What stood out most was their commitment to communication and their willingness to adapt to our firm's processes and requirements. Their support significantly improved our workflow and productivity throughout the tax season. We highly recommend Global Outsourcing Service to accounting and tax firms seeking dependable outsourcing solutions. We look forward to continuing our relationship with them in the future

Duke Mezier Mezier CPA PLLC

Tapesh and his team provide excellent bookkeeping services. They are knowledgeable, professional, and easy to work with. Communication is always clear, and they make managing finances much simpler. I highly recommend their services.

Pawan Salhan Owner Good Life Barbershop

Highly recommend! We have used their services for business tax filing, payroll processing, and personal tax filing, and the experience has always been excellent. They are very helpful, professional, and easy to coordinate with throughout the entire process. They always provide valuable tips, suggestions, and guidance to help make the best financial decisions. Their attention to detail, responsiveness, and willingness to answer questions truly stand out. We appreciate their support and look forward to continuing to work with them in the future.

Ashwin Shrestha Palate Garden, Texas

Great experience with TS Global Outsourcing—professional, responsive, and reliable. I’m usually very wary of services pitched in person, but having Tapesh Sharma come to my office turned out to be one of the best decisions I made.

Erick Guerrero "Enroll Agent" Multiservices Express Corp, NY

Their bookkeeping support has completely transformed how we manage our finances. Everything is organized and always delivered on time. Highly reliable team to work with.

Small Business Owner New York

We outsourced payroll to them and haven’t looked back since. Processing is smooth, compliant, and always on schedule. It has saved us both time and internal resources.

E-commerce Founder NYC

During tax season, their support was a game changer for our firm. They handled high volumes efficiently without compromising accuracy. Truly dependable during peak workloads.

CPA Firm Partner NYC

The team understands US accounting standards really well. Their reports are clean, detailed, and easy to work with. Perfect support for scaling businesses.

Startup Founder New York

We’ve been working with them for over a year now. Consistency, communication, and quality have always been top-notch. They feel like an extension of our own team.

Retail Business Owner New York

From bookkeeping to tax prep, everything is handled professionally. They use the right tools and processes to ensure smooth operations. Highly recommended for New York businesses

Finance Manager NYC Company

Powered by Industry-Leading Accounting & Tax Tools

We work with the most trusted accounting, payroll, and tax software used by businesses and CPA firms across New York.
Our team is experienced in handling multiple platforms, ensuring seamless integration, accurate reporting, and efficient workflows.

Ready to Scale Your Business with Reliable Financial Support?

Partner with a team that understands New York businesses and delivers accuracy, speed, and compliance.
Let us handle your bookkeeping, payroll, and taxes while you focus on growth.

Get in touch

We look forward to connect with you and engage in meaningful conversations

Give us a call

+1 (516) 642-6939 from Monday - Friday 8:30 AM to 5:30 PM