Outsourced Accounting Partner for Small and Medium Businesses
Bookkeeping | Tax Prep & E-filing | Fractional CFO
Created financials for thousands of growing companies across 50+ countries through our in-house team of CPAs, ACCAs, CAs, and certified bookkeepers.
Our Associations
Expert Accounting Without the Full-Time Hire
Hiring a full-time CFO costs $200,000 a year. A senior accountant adds another $80,000. A payroll specialist, a tax preparer, a bookkeeper, the costs stack fast. For most growing businesses, that math does not work.
So, we decided to close that gap.
You get credentialed professionals across every discipline, working inside the software you already use: QuickBooks, Xero, Sage, NetSuite, AppFolio, FreshBooks, and more.
Over 500 businesses across the US, UK, Canada, UAE, Australia, and Japan run their finances through us. From funded startups filing their first tax return to established companies needing CFO-level strategy, we handle the full financial picture, at a fraction of the cost of building it in-house.
White-Label Accounting Services in One Place
Our accounting and bookkeeping services are built around automated financial management and a team of 400 qualified professionals who understand what growing businesses actually need. From AI-driven accounting solutions that flag issues before they become problems, to CFO advisory that helps you plan ahead, we are set up to grow with you.
White-label Bookkeeping
QuickBooks, Xero, and Sage bookkeeping, and financial recording support for CPA firms managing multiple clients.
Bulk Tax Preparation
1040, 1065, 1120, and 1120S tax preparation support built for firms handling seasonal or high-volume filing workloads.
Backlog Cleanup
Catch-up accounting, historical transaction recording, and backlog cleanup for incomplete or disorganized books.
Accounts Management
Accounts payable, receivable processing, payroll support, and bank reconciliation services for smooth financial operations.
Payroll & Reconciliation
Payroll management support, bank reconciliation, and credit card reconciliation for accurate reporting.
Financial Reporting
P&L statements, balance sheets, cash flow reporting, chart of accounts setup, and structured reporting support.
Bookkeeping Services
Monthly transaction recording, reconciliation, bookkeeping management, and financial reporting support for growing businesses.
Tax Filing Services
Federal, state, sales tax, VAT, and GST filing support across the United States, United Kingdom, Canada, UAE, Australia, and Japan.
Payroll & HRM Services
Payroll processing, employee management support, HRM coordination, and ongoing workforce administration services.
Company Formation
Entity setup, EIN, ITIN, VAT registration, and business incorporation support across multiple jurisdictions.
Fractional CFO Services
CFO advisory, budgeting, cash flow forecasting, financial analysis, and controllership support for scaling companies.
Business Support Services
Virtual assistance, inventory management, business valuation, and startup advisory services for operational growth.
Beyond offering services, we complement your journey with our commitment to Satisfaction.
Experience is the key to knowledge.
At Mercurius Advisory Services, we’ve cultivated a culture that values expertise, genuine care, and lasting partnerships. Our services are designed to provide you with unparalleled support, offering solutions built on years of experience. Explore our comprehensive offerings to empower your business.
Drop Your Email
Interested in our services or want to inquire more? Just drop your email, and we’ll reach out to you.
Partners with
The Expertise Behind Your Books
Most accounting problems are not accounting problems. They are visibility problems. A business owner who cannot clearly see cash flow, margins, liabilities, or reporting delays cannot make confident business decisions.
Siddhartha Havelia and Ankit Jain spent years inside global advisory practices watching growing businesses struggle with exactly that, and decided to build something better.
What they built is not just another outsourced accounting service. It is a team built around accuracy, accountability, and operational consistency. The kind of accounting support that catches reporting issues early, keeps compliance under control, and helps businesses operate with clearer numbers and fewer surprises.
Today, more than 2,500 businesses trust Maspartner to keep their books organized, reporting reliable, and accounting operations running smoothly.
Your Financial Data Is Protected
Secured systems | Controlled access | ISO-certified protocols
We are ISO 9001 and ISO 27001 certified. Through automated financial management and secure internal workflows, we help businesses keep sensitive financial data protected at every stage.
Security Standards
- ISO 9001 and ISO 27001 Certified
- Legally Binding Non-Disclosure Agreements
- Encrypted FTP File Transfer Portal
- Controlled In-House Employee Access
- Real-Time Data Validation at Entry Points
- Firewall Protected Network Storage with Remote Backup
- Strict Data Retention and Disposal Policy
Our Client Reviews
Blogs
Progressively maintain extensive infomediaries via extensible niches. Dramatically disseminate standardized metrics after resource leveling processes. Objectively pursue diverse catalysts for change for services.
Our Success Stories
FAQs
What does outsourced accounting actually include?
Outsourced accounting covers the full range of accounting and operational support your business would otherwise hire internally, including bookkeeping, monthly reconciliations, accounts payable and receivable, payroll processing, tax preparation, reporting, and CFO-level advisory. At Maspartner, the scope is customized to your stage of growth. Early-stage startups usually begin with bookkeeping and tax support, while scaling companies expand into payroll, fractional CFO support, and multi-entity accounting as operations become more complex.
How much does outsourced accounting cost for a small business?
Pricing depends on transaction volume, number of accounts, and the services required. Most small businesses pay between $300 and $1,200 per month for bookkeeping and basic accounting. Tax preparation is typically priced per return. Maspartner provides a transparent, fixed monthly quote after an initial consultation, ensuring there are no hourly overages or surprise invoices.
How does the onboarding process work?
Onboarding starts with a 30-minute discovery call where we understand your business structure, current accounting setup, reporting requirements, and operational priorities. We then assign a dedicated accountant and complete a one-time cleanup or migration of your existing books. Most clients are fully onboarded within 5 to 10 business days, with a single point of contact managing communication from day one.
What accounting software does Maspartner work with?
Our team is proficient across all major accounting platforms used by US, UK, and Australian businesses, including QuickBooks Online, QuickBooks Desktop, Xero, Sage, MYOB, FreshBooks, and Wave. For tax, we work with ProConnect, Lacerte, Drake, and UltraTax. We work inside your existing tools because we do not force a platform change.
Is my financial data secure with an outsourced accounting partner?
Yes. Maspartner operates under strict data confidentiality protocols including NDAs for every engagement, role-based access controls, and encrypted data handling. Our AI-driven accounting solutions and intelligent accounting systems are designed to support secure financial workflows, controlled access management, and safer document handling across global operations. We follow GDPR-aware practices for UK and EU clients along with US data protection standards while helping businesses maintain automated financial management processes and access to secure real-time financial insights. Your financial data is never shared, sold, or accessed beyond the team assigned to your account.
Can you handle my US business taxes if your team is based remotely?
Yes. Our CPAs are licensed to handle federal and state tax preparation and filing for US businesses regardless of where our team is physically located. Remote delivery does not affect accuracy, compliance, or deadlines. We handle individual business returns, corporate tax filings, multi-state tax compliance, and quarterly estimated tax payments. Every filing is reviewed by a CPA before submission.
Can Maspartner handle multi-state or international tax compliance?
Yes. We prepare federal and state tax returns across all US states, including sales tax filings for businesses with multi-state nexus. For international clients, we handle UK self-assessment, corporation tax, VAT, and cross-border compliance for companies operating in the US, UK, Canada, UAE, and Australia. Our team includes tax professionals qualified in multiple jurisdictions.
How quickly can Maspartner turn around monthly financials?
Standard monthly financials, such as your profit and loss statement, balance sheet, and bank reconciliation, are delivered within 5 business days of the month close, provided all bank feeds and source documents are connected. For clients requiring faster turnaround, we offer a 2-day close process for an additional fee. Urgent tax filings and deadline-driven deliverables are handled on a case-by-case basis.
Do I get a dedicated accountant or does my work go to a general pool?
Every Maspartner client is assigned a dedicated accountant and a senior reviewer. You have direct communication with your accountant via email, WhatsApp, or video call, whichever you prefer. Your books are not handled by a rotating team. The same professional manages your account month to month, which means context is never lost between periods.
Is outsourced accounting right for a startup or early-stage company?
Yes. Startups benefit most from outsourced accounting because accounting and compliance requirements change quickly in the early stages of growth. A startup does not need a full-time CFO in month three. Maspartner works with pre-revenue and early-stage companies to set up the right chart of accounts, prepare investor-ready reporting, manage payroll from day one, and maintain tax compliance as the business scales. You pay for the support you need, not a full-time salary.
