Outsourced Accounting & Bookkeeping Services for CPA Firms and Growing Businesses

Cut your accounting costs by up to 75% with offshore bookkeeping services, tax preparation, payroll, controller services, and part-time CFO support - accurate, audit-ready financials delivered on schedule.

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DDiligenceOS
★★★★★5.0/4.9
Call us-
+1 (708) 629-1744
Accounting professional working at her desk
Client Cost Savings75%
Accuracy Rate99.8%

Transforming numbers into business growth

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Client Retention
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Years Experience
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Businesses Supported
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Projects Completed

Achieving financial clarity through services

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Bookkeeping Services

Complete bookkeeping that keeps your records accurate, current, and audit-ready.

  • Vendor Bill Coding
  • Vendor Payments
  • Customer Invoicing
  • Receipts Processing
  • Payroll Processing
  • Payroll Reconciliation & Quarterly Tax Forms
  • Bank Reconciliations
  • 1099
  • W-2, 941 & 940
  • Sales Tax
  • Payroll Tax
  • Night Audit
Tax Preparation Services

Comprehensive tax preparation across entity types, with accuracy at every deadline.

  • 1040 Individual
  • 1065 Partnership
  • 1120 / 1120S Corporate
  • 1041 Estate & Trust
  • 990 Exempt Org
Part-Time CFO Services

Strategic financial leadership and growth planning without the full-time CFO cost.

  • Budgeting & Forecasting
  • Cash Flow & Revenue Management
  • KPI Analysis
  • Mergers & Acquisitions
  • Financial Analysis & Modelling
  • Specialized Projects
  • Business Valuation
Controller Services

Financial oversight and controls that strengthen reporting and business performance.

  • Monthly Adjusting & Closing Entries
  • Prepaids & Accruals
  • Financial Statement Preparation & Review
  • Weekly Cash Flow Projection
Bookkeeping Services Tax Preparation Services Part-Time CFO Services Controller Services

Why businesses choose DiligenceOS

A partner built around accuracy, security, and the flexibility your firm needs to grow.

Reliable, Accurate Financial Results

Numbers you can trust, delivered consistently and on time.

Accounting Expertise on Demand

Skilled professionals available exactly when you need them.

Decision-Ready Financial Reports

Advanced reporting built to support better business decisions.

Faster Turnaround Time

Time-zone advantage means work moves forward while you sleep.

Pool of Talent Under One Umbrella

Bookkeepers, tax preparers, and CFO-level expertise in one team.

Budgeting and Forecasting

Forward-looking planning support, built into your engagement.

75% Savings

Save over an in-house bookkeeper, payroll admin, and accountant.

Customized Engagements

From vacation or leave coverage to full-time assistance.

Industries we serve

From CPA firms to construction companies, we understand the numbers behind your business.

Individual CPAs & CPA Firms

Seasonal capacity and year-round support for client work.

Restaurants, Bars, Pubs & Hotels

Multi-location bookkeeping, payroll, and cost controls.

Real Estate & Construction

Property accounting, job costing, WIP, and progress billing.

Manufacturers

Inventory accounting, cost analysis, and margin reporting.

Retail

Sales reconciliation, sales tax, and inventory tracking.

Software expertise across your stack

We work with the tools you already use.

QuickBooks Xero Sage Zoho Books TurboTax TaxAct UltraTax CS ADP Intuit Gusto Paylocity Bill.com

Not limited to them.

A smart workflow for financial success

From sending documents to finalized financials - simple, secure, and on schedule.

Share your documents securely - or simply give us access to where they already live.

Sending documents
01
Send Documents

We connect to your accounting software through secure remote access.

Accessing accounting systems
02
Access System

Our team processes your books with accuracy and speed.

Accounting work in progress
03
Accounting Done

Senior reviewers verify every number before it reaches you.

Review session
04
Review

You receive finalized, decision-ready financials on schedule.

Finalizing financials
05
Finalize the Financials
Accounting team collaborating in a meeting
Accountant reviewing financial documents

Your trusted accounting partner awaits

DiligenceOS is a top-notch finance & accounting outsourcing company providing result-oriented outsourced accounting services to clients worldwide.

We have a pool of skilled and experienced accounting professionals with top-of-the-line domain expertise and strong knowledge in accounting. Looking to extend your team? We are a one-stop solution for you or your clients to handle all the accounting functions.

  • Reliable, Accurate Financial Results
  • Accounting Expertise on Demand
  • Faster Turnaround Time
  • Pool of Talent Under One Umbrella
  • 75% Savings Over In-House Staff
5+
Years of Experience
500+
Happy Clients
Learn more about us

Book your free consultation

Pick a time that suits you for a free 30-minute call. We'll review your current bookkeeping, tax, or CFO needs and you'll leave with a clear action plan - whether or not we end up working together.

Prefer email? Reach us at sales@dosacc.com or call +1 (708) 629-1744.