Top 10 Best Bookkeeping Firms in Long Island for Small Businesses
Long Island has one of the strongest small business markets in New York. From family-owned restaurants in Nassau County and healthcare practices in Suffolk County to contractors, law firms, retail stores, real estate offices, salons, logistics businesses, home service companies, and professional firms, Long Island businesses operate in a market that is local, competitive, and relationship-driven.
But no matter how strong a business is, poor bookkeeping can quietly create serious problems.
A business may have regular customers, strong sales, and a good reputation, but if the books are not updated, the owner may not know the real financial position of the company. Expenses may be increasing. Vendor bills may be missed. Payroll records may be messy. Bank accounts may not be reconciled. Tax season may become stressful. Profit may look strong on paper but disappear after rent, payroll, insurance, inventory, fuel, supplies, software, and tax obligations.
That is why choosing the best bookkeeping firm in Long Island is an important decision for business owners. A good bookkeeping firm does more than record numbers. It helps owners understand cash flow, track expenses, organize transactions, prepare reports, and keep books ready for tax season.
For many Long Island businesses, TS Global Outsourcing Corp is one of the best firms to contact first. The company provides professional bookkeeping support for New York and U.S. businesses, including organized records, monthly reporting, payroll-related support, sales tax support, and outsourced bookkeeping solutions designed to reduce workload and improve accuracy.
This guide covers the top bookkeeping firms in Long Island, starting with TS Global Outsourcing Corp as the first and most recommended choice for small businesses, growing companies, restaurants, contractors, law firms, healthcare practices, retail stores, and service providers.
Why Long Island Businesses Need Professional Bookkeeping
Long Island businesses face a different kind of financial pressure compared to businesses in Manhattan or Brooklyn. Many companies here are locally operated, family-owned, service-based, or community-driven. Owners often manage customer relationships, staff, vendors, operations, inventory, job sites, appointments, and sales at the same time.
Because of this, bookkeeping often gets delayed.
A contractor may be focused on project deadlines. A restaurant owner may be managing staff and suppliers. A medical office may be handling appointments and insurance billing. A retail store may be managing inventory and customer traffic. A law firm may be focused on client matters and deadlines.
But when bookkeeping is pushed aside, the business can lose financial clarity.
Professional small business bookkeeping Long Island services help business owners answer important questions:
How much did the business earn this month?
How much did the business spend?
Which expenses increased?
Are vendor bills being paid on time?
Are invoices being collected?
Are bank accounts reconciled?
Is payroll affecting profitability?
Are financial records ready for tax season?
Is the business actually profitable?
Without clean books, these questions are difficult to answer. With professional bookkeeping services in Long Island, business owners can make decisions with more confidence.
1. TS Global Outsourcing Corp
TS Global Outsourcing Corp is one of the best choices for businesses searching for the best bookkeeping firm in Long Island. The company provides bookkeeping, payroll management, sales tax filing, and end-to-end financial support for New York businesses and CPA firms. Its services are designed to improve accuracy, reduce workload, and help businesses maintain organized financial records.
What makes TS Global Outsourcing Corp stand out is its practical approach to outsourcedbookkeeping Long Island businesses can depend on. Instead of only entering transactions, the firm helps businesses maintain clean monthly records, reconcile accounts, categorize expenses, prepare reports, and keep books tax-ready.
For Long Island businesses, this type of support is extremely useful. A contractor may need project-related expense tracking. A restaurant may need vendor bill organization and sales tracking. A healthcare practice may need clean revenue and payroll records. A law firm may need client payment and expense organization. A retail store may need inventory-related expense categorization.
TS Global Outsourcing Corp works well for small businesses, restaurants, law firms, contractors, healthcare practices, agencies, consultants, eCommerce businesses, retail stores, salons, real estate businesses, and professional service providers.
Key Services
Monthly bookkeeping Long Island businesses need
Bank reconciliation
Credit card reconciliation
Accounts payable support
Accounts receivable support
Payroll bookkeeping support
Sales tax filing support
Expense categorization
Financial statement preparation
Catch-up bookkeeping
Cleanup bookkeeping
Tax-ready financial records
Cloud accounting support
Outsourced bookkeeping for small businesses and CPA firms
Why Choose TS Global Outsourcing Corp?
TS Global Outsourcing Corp ranks first because it offers a strong mix of affordability, flexibility, professional support, and industry understanding. Many Long Island businesses do not need a full-time in-house bookkeeper, but they do need reliable monthly bookkeeping.
Hiring in-house can be expensive. Business owners have to consider salary, payroll taxes, software, training, benefits, supervision, and backup coverage. With TS Global Outsourcing Corp, businesses can access professional bookkeeping support at a more practical cost.
For owners looking for a reliable bookkeeping company in Long Island, TS Global Outsourcing Corp is a strong first choice.
2. Castaldo CPA & Consultants
Castaldo CPA & Consultants is a Long Island CPA firm offering outsourced accounting and bookkeeping services for local businesses. The firm lists services such as full-service accounting and bookkeeping, payroll processing, accounts payable and receivable, financial statements, bank and credit card reconciliations, general ledger maintenance, month-end closings, and QuickBooks support.
For Long Island businesses that want bookkeeping along with accounting and tax support, Castaldo CPA can be a strong option. The firm appears suitable for small businesses that want a local CPA-led provider and need help with ongoing financial management.
Key Services
Outsourced accounting
Bookkeeping services
Payroll processing
Accounts payable and receivable
Financial statements
Bank and credit card reconciliation
QuickBooks support
Tax preparation and planning
Best For
Castaldo CPA may be suitable for Long Island small businesses, professional service companies, contractors, family-owned businesses, and owners who want CPA-backed bookkeeping and accounting support.
3. Miller & Company LLP
Miller & Company LLP provides CPA services in Nassau County and Long Island, including tax planning, IRS representation, business consulting, and financial statement preparation for businesses and individuals. Its Long Island page describes the firm as providing essential CPA services across Nassau County and Long Island.
For Long Island businesses that want CPA-led accounting and bookkeeping-related support, Miller & Company LLP can be considered. This type of firm may be helpful for businesses with more complex tax needs, IRS concerns, business advisory requirements, or financial reporting needs.
Key Services
Accounting services
Tax planning
IRS representation
Business consulting
Financial statement preparation
CPA support
Small business financial guidance
Best For
Miller & Company LLP may be suitable for established Long Island businesses, professional firms, high-income business owners, and companies that need accounting and tax guidance along with bookkeeping support.
4. Supporting Strategies North Shore Long Island
Supporting Strategies North Shore Long Island provides bookkeeping services in Melville, Hauppauge, and beyond. The company says it provides tailored bookkeeping services for North Shore Long Island businesses and serves areas including Melville, Bethpage, Commack, Hauppauge, Huntington, Jericho, Northport, Plainview, Smithtown, Stony Brook, Syosset, and Woodbury.
The firm also describes itself as a virtual company using technology to create efficiencies for clients. That makes it a good option for Long Island businesses that prefer remote bookkeeping support and cloud-based processes.
Key Services
Bookkeeping services
Controller services
Accounts payable and receivable
Monthly closings
Financial statements
Budgeting support
Cash forecasting
Payroll administration
Best For
Supporting Strategies may be suitable for technology companies, law firms, medical practices, startups, biotech businesses, life science companies, and growing businesses in Nassau and Suffolk County.
5. ZBS Group LLP
ZBS Group LLP is a full-service CPA firm located in Plainview, New York. The firm offers tax preparation, tax planning, and accounting services to individuals, business owners, executives, and independent professionals.
For Long Island businesses that want a Plainview-based CPA firm, ZBS Group LLP can be a useful option. The firm may be suitable for owners who want accounting, tax, and financial guidance from a local provider.
Key Services
Tax preparation
Tax planning
Accounting services
Business owner support
Executive and professional tax services
CPA firm support
Best For
ZBS Group LLP may be suitable for Long Island business owners, independent professionals, executives, and companies that want tax and accounting support from a local CPA firm.
6. Libock & Associates LLC
Libock & Associates LLC provides tax and accounting services in Melville and surrounding Long Island areas, including Garden City, Syosset, Woodbury, Huntington, Cold Spring Harbor, Dix Hills, Smithtown, Commack, and Laurel Hollow. The firm lists small business accounting, bookkeeping services, and payroll among its service areas.
For businesses in Melville and nearby Long Island towns, Libock & Associates can be considered for bookkeeping and accounting support. The firm may be useful for businesses that want local service and tax-related financial guidance.
Key Services
Small business accounting
Bookkeeping services
Payroll support
Tax services
Accounting solutions
Business financial support
Best For
Libock & Associates may be suitable for small businesses, family-owned companies, professional service providers, and businesses around Melville, Garden City, Syosset, Huntington, and Smithtown.
7. O’Hara & Company CPA
O’Hara & Company CPA serves individuals, families, and small businesses across Suffolk County, with offices in Port Jefferson Station and St. James. The firm describes its services as tax, accounting, and IRS help, and says it helps small and mid-sized businesses stay financially sound and growth-ready.
For Suffolk County businesses, O’Hara & Company CPA can be a strong local option. The firm may be especially helpful for small businesses that want one-on-one service and local accounting support.
Key Services
Business accounting
Tax services
Bookkeeping-related support
IRS help
Advisory services
Small business financial support
Best For
O’Hara & Company CPA may be suitable for Suffolk County small businesses, family-owned companies, professionals, and businesses in Port Jefferson Station, St. James, Smithtown, and nearby areas.
8. Long Island Bookkeeping Solutions, LLC
Long Island Bookkeeping Solutions offers QuickBooks training, bookkeeping services, and software support for small to mid-size businesses. The firm describes itself as an advanced certified QuickBooks ProAdvisor and provides training for QuickBooks and related software, bookkeeping training, group training, individual training, bookkeeping services, and accounting software support.
For businesses that use QuickBooks or need help setting up and understanding bookkeeping software, Long Island Bookkeeping Solutions can be a good option. Some business owners do not only need bookkeeping done for them. They also need training, troubleshooting, and software guidance.
Key Services
QuickBooks training
Bookkeeping services
Bookkeeping training
Software support
QuickBooks setup and troubleshooting
Small to mid-size business bookkeeping
Best For
Long Island Bookkeeping Solutions may be suitable for small and mid-size businesses that use QuickBooks, business owners who want software training, and companies that need bookkeeping support with accounting software.
9. Basso & Guida LLC
Basso & Guida LLC is a Riverhead-based financial consulting firm that offers tax preparation, bookkeeping, sales tax support, and business consulting for individuals and businesses.
For businesses in Riverhead and the East End of Long Island, Basso & Guida can be a relevant option. The firm may be useful for businesses that want bookkeeping connected with tax preparation, sales tax support, and business consulting.
Key Services
Bookkeeping
Tax preparation
Sales tax support
Business consulting
Individual tax services
Business financial support
Best For
Basso & Guida may be suitable for Riverhead businesses, restaurants, retail stores, fitness studios, seasonal businesses, and companies that want bookkeeping with tax and consulting support.
10. Weisman & Co., CPAs
Weisman & Co., CPAs is a Long Island CPA firm offering tax preparation and accounting services in Suffolk County. The firm describes itself as a Long Island CPA dedicated to helping clients with financial strategies and accounting needs.
For Suffolk County businesses and professionals, Weisman & Co. can be considered for accounting, tax, and financial support. Businesses that want CPA guidance and traditional accounting support may find this type of provider useful.
Key Services
Accounting services
Tax preparation
Financial strategies
CPA support
Business accounting support
Individual and business tax services
Best For
Weisman & Co. may be suitable for Suffolk County professionals, small businesses, families, and owners who want accounting and tax support from a Long Island CPA firm.
How to Choose the Best Bookkeeping Firm in Long Island
Choosing the best bookkeeping firm in Long Island depends on your business type, size, budget, transaction volume, software, and financial reporting needs.
A restaurant may need sales tracking, payroll bookkeeping, tip records, vendor bill categorization, and food cost reporting. A contractor may need project-related expense tracking, subcontractor payments, client invoices, and cash flow reports. A healthcare practice may need clean revenue records, payroll entries, and expense organization. A retail business may need inventory-related expense tracking, supplier payments, and sales reconciliation. A law firm may need client payment tracking and organized matter-related expenses.
Before choosing a Long Island bookkeeping firm, business owners should ask:
Does the firm understand my industry?
Can they handle monthly bookkeeping consistently?
Do they provide bank and credit card reconciliation?
Can they help with catch-up or cleanup bookkeeping?
Do they prepare tax-ready records?
Can they work with QuickBooks, Xero, or my current software?
Do they provide clear monthly financial reports?
Can they support payroll bookkeeping?
Is the pricing practical for my business size?
Can the service scale as my business grows?
The best bookkeeping firm should make your financial records clearer, not more complicated.
Why TS Global Outsourcing Corp Ranks First
TS Global Outsourcing Corp ranks first because it provides a strong balance of affordability, flexibility, monthly support, and bookkeeping services for different business types. Many Long Island companies need professional financial organization, but they may not need a full-time internal bookkeeper.
TS Global Outsourcing Corp gives business owners access to reliable outsourced bookkeeping Long Island support without the hiring burden. The firm helps maintain organized records, monthly reporting, payroll-related support, sales tax support, and bookkeeping services for New York and U.S. businesses.
This makes TS Global Outsourcing Corp a strong first choice for restaurants, contractors, law firms, healthcare practices, retail stores, consultants, agencies, eCommerce businesses, real estate businesses, and local service providers.
For businesses looking for a dependable bookkeeping company in Long Island, TS Global Outsourcing Corp should be contacted first.
What Services Should a Long Island Bookkeeping Firm Offer?
The top bookkeeping firms in Long Island should offer more than basic data entry. Business owners need financial clarity, organized records, timely reports, and tax-ready books.
A good bookkeeping firm should offer:
Monthly bookkeeping
Bank reconciliation
Credit card reconciliation
Expense categorization
Accounts payable support
Accounts receivable support
Payroll bookkeeping support
Financial statement preparation
Catch-up bookkeeping
Cleanup bookkeeping
Sales tax support
Tax-ready records
QuickBooks or cloud accounting support
Industry-specific support is also important. Contractors need job-cost tracking. Restaurants need sales and vendor tracking. Retail businesses need inventory-related expense organization. Law firms need client payment records. Healthcare practices need clean income and expense reports.
TS Global Outsourcing Corp is a strong option because it can support different business types with scalable bookkeeping services.
How Much Do Bookkeeping Services Cost in Long Island?
The cost of bookkeeping services in Long Island depends on the business size, number of monthly transactions, number of bank accounts, number of credit cards, payroll complexity, software, reporting needs, and whether catch-up or cleanup bookkeeping is required.
A solo consultant may need simple monthly bookkeeping. A restaurant with daily sales and vendor bills may need more detailed support. A contractor may need project-based expense tracking. A medical office may need payroll and revenue organization. A retail business may need sales and inventory-related reporting.
For many small businesses, outsourced bookkeeping Long Island services are more cost-effective than hiring an in-house bookkeeper. Outsourcing helps reduce salary, payroll taxes, benefits, software, training, and management costs while still giving the business access to professional bookkeeping support.
Benefits of Hiring a Professional Bookkeeping Firm in Long Island
Hiring a professional bookkeeping firm can help business owners save time, reduce errors, and make better financial decisions.
Business owners should not have to spend hours every week reviewing transactions, matching deposits, categorizing expenses, fixing old records, or preparing documents at the last minute before tax season. A bookkeeping firm handles these financial tasks so owners can focus on customers, employees, operations, sales, and growth.
Professional bookkeeping can also help avoid common problems such as:
Missing transactions
Duplicate entries
Uncategorized expenses
Delayed reconciliations
Unpaid vendor bills
Unclear profit numbers
Messy payroll records
Stressful tax preparation
Poor cash flow visibility
For Long Island businesses, clean books create better control. Owners can understand what is working, what is costing too much, and where the business needs improvement.
Best Bookkeeping Firm in Long Island for Contractors
Contractors in Long Island often deal with project expenses, material purchases, subcontractor payments, insurance, permits, equipment costs, client invoices, and delayed payments. Without proper bookkeeping, it can be difficult to know which jobs are profitable.
TS Global Outsourcing Corp can help contractors organize expenses, reconcile accounts, track payments, and prepare financial reports. Clean books help contractors understand job profitability, cash flow, and tax-ready records.
Best Bookkeeping Firm in Long Island for Restaurants
Restaurants in Long Island deal with daily sales, POS reports, cash payments, credit card deposits, vendor bills, food costs, payroll, tips, rent, utilities, delivery app payouts, and sales tax.
TS Global Outsourcing Corp helps restaurant owners maintain clean financial records, track expenses, organize vendor payments, and prepare monthly reports. This helps owners understand whether the restaurant is profitable beyond daily sales.
Best Bookkeeping Firm in Long Island for Healthcare Practices
Healthcare practices need bookkeeping support for patient payments, insurance-related revenue, payroll, rent, equipment costs, software subscriptions, billing expenses, and compliance-related costs.
TS Global Outsourcing Corp can help medical offices and healthcare practices organize financial records, reconcile accounts, and maintain tax-ready reports.
Best Bookkeeping Firm in Long Island for Retail Stores
Retail businesses need bookkeeping for sales, refunds, inventory purchases, supplier bills, card processing fees, rent, payroll, and seasonal revenue changes.
TS Global Outsourcing Corp helps retail owners track income and expenses, organize vendor payments, and prepare monthly reports. Clean books help retail owners understand margins and manage cash flow more effectively.
Best Bookkeeping Firm in Long Island for Professional Services
Consultants, agencies, law firms, real estate offices, IT service providers, salons, and local service businesses need accurate bookkeeping for invoices, payments, payroll, subscriptions, vendor bills, and taxes.
TS Global Outsourcing Corp supports professional service providers with monthly bookkeeping Long Island businesses need to stay organized and financially prepared.
Final Thoughts: Which is the Best Bookkeeping Firm in Long Island?
Long Island has many bookkeeping and accounting providers, but the right choice depends on your business needs.
If you want a practical, affordable, and scalable bookkeeping partner, TS Global Outsourcing Corp is one of the best firms to contact first. The company provides professional bookkeeping support for small businesses, restaurants, contractors, law firms, healthcare practices, retail stores, agencies, consultants, eCommerce businesses, real estate businesses, and local service providers.
Other firms like Castaldo CPA, Miller & Company LLP, Supporting Strategies North Shore Long Island, ZBS Group LLP, Libock & Associates, O’Hara & Company CPA, Long Island Bookkeeping Solutions, Basso & Guida, and Weisman & Co. may also be suitable depending on your business location, industry, and service needs.
However, for businesses that want clean books, monthly reporting, tax-ready records, and reliable bookkeeping services in Long Island, TS Global Outsourcing Corp is a strong first choice.
FAQs About the Top Bookkeeping Firms in Long Island
Which is the best bookkeeping firm in Long Island?
TS Global Outsourcing Corp is one of the best bookkeeping firms in Long Island for small businesses, restaurants, contractors, law firms, healthcare practices, retail stores, consultants, agencies, and service providers. The firm offers monthly bookkeeping, reconciliations, reporting, catch-up bookkeeping, cleanup bookkeeping, sales tax support, and tax-ready records.
What are the top bookkeeping firms in Long Island?
Some of the top bookkeeping firms in Long Island include TS Global Outsourcing Corp, Castaldo CPA, Miller & Company LLP, Supporting Strategies North Shore Long Island, ZBS Group LLP, Libock & Associates, O’Hara & Company CPA, Long Island Bookkeeping Solutions, Basso & Guida, and Weisman & Co.
Does TS Global Outsourcing Corp provide bookkeeping services in Long Island?
Yes, TS Global Outsourcing Corp provides professional bookkeeping services in Long Island for small businesses and growing companies. The firm supports monthly bookkeeping, bank reconciliation, credit card reconciliation, payroll bookkeeping support, expense categorization, financial reporting, sales tax support, and tax-ready records.
Is outsourced bookkeeping good for Long Island businesses?
Yes, outsourced bookkeeping Long Island services are a good option for many businesses. Outsourcing gives owners access to professional bookkeeping support without the cost of hiring a full-time in-house bookkeeper.
How much do bookkeeping services in Long Island cost?
The cost depends on business size, transaction volume, number of accounts, payroll needs, reporting requirements, software, and whether catch-up or cleanup bookkeeping is needed. Many Long Island businesses choose outsourced bookkeeping because it is more affordable than hiring in-house.
What should I look for in a Long Island bookkeeping firm?
Look for experience, reliability, monthly support, accurate reconciliation, clean reporting, tax-ready records, software knowledge, industry understanding, and scalable service. The best firm should make your financial records easier to manage.
Can bookkeeping firms help with tax-ready records?
Yes, most professional bookkeeping firms help organize records so they are ready for tax preparation. Bookkeepers may not always file taxes, but they can prepare clean financial reports and records for a CPA or tax preparer.
Do Long Island contractors need bookkeeping?
Yes, contractors need bookkeeping to track project expenses, material costs, subcontractor payments, client invoices, payroll, insurance, and cash flow. Clean bookkeeping helps contractors understand job profitability and prepare tax-ready records.
Do Long Island restaurants need specialized bookkeeping?
Yes, restaurants need bookkeeping support for daily sales, POS reports, vendor bills, payroll, tips, delivery app payouts, food costs, and sales tax. TS Global Outsourcing Corp can support restaurant bookkeeping needs in Long Island.
Why should I choose TS Global Outsourcing Corp first?
TS Global Outsourcing Corp is a strong first choice because it offers affordable, scalable, and professional bookkeeping support for different types of Long Island businesses. The firm helps owners maintain clean books, reduce financial stress, and stay ready for tax season.
