Deliver Personal Service

Welcome to OS1 Enterprise

We aim to be your strategic growth partner, not just your accounting or ‘bookkeeping’ firm.

Cloud accountant

Tech Savvy, Cloud Accountants & CPAs

We are more than a traditional accountant who may only have access to your data months after the year-end.

Corporate Secretarial Services

Peace of Mind – Simple. Efficient. Effective. Results Delivered.

Fixed & Affordable price plans, no surprise bills.



Establish a robust and reliable financial system is not an easy task. Whether you're an established business or a start-up, choosing to adopt intelligent cloud tools can save yourself headaches and a lot of money.


Our Vision

Here at OS1, we have a vision of redefining the way the world sees accounting. OS1 stands for (O)rganization, (S)atisfaction, and operating as our valued clients (1)st port of call.

1. We firmly believe that accounting and bookkeeping should not be stressful, time-consuming or costly. Our mission is to combine seasoned wisdom with a youthful outlook to improve businesses both small and large.

2. We shall equip our clients with powerful, intelligent cloud tools that track performance for better business.

3. We adhere to global industry standards, whilst taking our clients’ convenience to new heights. Client satisfaction is our promise. Everything we do is handled with the utmost professionalism and responsibility, allowing companies to focus on the more important aspects of their growing business.

Singapore Business Services We Offer

Xero Gold Partners

Stop destroying your business with poor quality accounting and bookkeeping services. Let us take the guesswork out of the equation by offering top notch outsourced accounting services.

Enterprise Booking Services

Supercharge your profits with our professional bookkeeping services in Singapore. Focus on what you do best and let us take care of the rest!

Tax Management Services

Taxes are hard to understand and manage, and without proper knowledge, you can end up with stress and strain. Let us offer you the best tax management services.

Financial Architecture Advisory Services

We offer professional guidance on the healthy management of your financial situation. Let us handle the complex and boring tasks for you while you work on important ones.

Integrated Business Advisory Services

You will be working with an expert team that has partnerships with industry leaders in Human Capitalization, Learning & Development, Branding & Marketing, Franchising & Licensing, Business Matching, Legal Advisors, Government Assistance Schemes advisory, Investment Accounts and Information Technology.

payroll services Singapore

Payroll can seem tedious. Let O.S.1 handle it for you – leaving you free to focus on the core activities of your business. We will process payment instructions, produce statutory reports, salary reports, and electronic payslips for online viewing by specific personnel, and file bank payments for you.

Real Time Info-tell via Cloud-based Automation

Finally, you can streamline your administrative responsibilities and reduce time wasted on redundant tasks. With our Cloud Business Accounting software services, you can now seamless integration of all your accounting, administrative, operating, stock management, and even payment gateway applications, O.S.1 offers a revolutionary way to manage your accounting tasks.

Company Incorporation Services

Singapore is a superb, convenient location for domestic and international businesses to establish their head office or offshore headquarters. The country offers considerable tax, financial, and operational advantages to businesses and investors alike. For start-up companies, we offer a comprehensive Incorporation of Company package that includes all the required items and services needed to set up.

Company Secretarial Services

Appointing a secretary is crucial within 6 months of a newly incorporated company (as per Singapore Companies Act). With OS1 Enterprise as a corporate secretary on board, a company can readily arrange other corporate needs, such as record keeping; preparation of resolutions and meetings; lodgment of any company changes with the Accounting and Corporate Regulatory Authority (ACRA); preparation of the company's Annual General Meeting as well as submission of Annual Return to ACRA; preparation of annual report in the prescribed formats; and even in striking off a company from the official Register.

Our Solutions

What we really do is setup custom solutions to solve common business problems.

See below examples of the problems we solve and solutions we provide:

E Commerce, Retail and Food & Beverages

accounting services singaporeWhat You Need

If you want to sell products online via a store front or sales channels, you will need to track your inventory. There are some tools to do that, which include POS tools, inventory and sales channels. But it’s hard to find the right tool that helps you get more than inventory management. A proper tool should bring you financial reports, cost and bill insight as well as inventory costs, all while being able to pay vendors.

How We can Help

Our team will make sure that you get a dedicated financial system. This system will help you enter and receive bills, your inventory costs will be synced and calculated to Xero. Your accounting system includes all the details that you need for following up the wholesale invoices or make any financial decisions. Moreover, our accounting team will bring you monthly reports and our expert advisors will ensure that your budget and cashflow are managed adequately and with a great attention to detail. We also make sure that your info syncs to Xero from the POS system and the inventory as well!

Professional Services

Accounting services singaporeWhat You Need

We are a team of experts that can help companies of any size. We study your needs and make sure that you get the right solution for tracking billables, jobs and time spent on a task. Moreover, we also offer cloud based tools that can help manage your cashflow, clients and staff too. In order for your business to grow, you need to make sure that you have complete control over your income tax compliance, payroll and sales tax.

How We can Help

We will make sure that any projects specifics like CRM, time tracking or anything similar is a part of the accounting system. All the crucial information will be a part of the financial report and you will have no problem reducing costs, time and the results can be more than impressive. Also, we will boost your ability to manage any accounts receivables, all while getting the bills paid and completing them in record time!

Why Should You Invest Your Time And Money With OS1?

It is important to have a professional accounting firm at your disposal.

Without us, you may be struggling more than you have to. Let us ease your mind and soul. We know how to do our job correctly and quickly. We are trained to do an exceptional amount of work in very little time. We know how to give you the results you desire. There’s nothing we don’t know or can’t do when it comes to accounting.

Leave it to the professionals so you can manage your business and help it thrive.

Get in touch with the most professional accounting services provider.

Testimonials - Happy Client, Happy Business

  • The services that OS1 rendered are fast and accurate. Will recommend to my business partners for sure. Keep up the good work.
    Kenny Lim
  • “Nicole has done a fantastic job managing my small business accounts in the consulting and education sector. She works accurately and efficiently, is friendly and approachable, uses the right tools to get the job done and is flexible to meet changes in circumstances.”
    Hugh Terry, Rain Trees Kindergarten Pte Ltd
  • “We look to O.S.1 to take care of our tax preparations and accounting needs. They are highly responsive and a pleasure to work with. We are very satisfied with their services.”
    P.K.Kakoulidis Shipping Singapore Pte Ltd
  • “I confirm that I have dealt with O.S.1 Pte Ltd since Aug 2011, during which time they have provided my business with excellent support in the area of account services. Their work has help us in smoothening the account activities in our company enabling us to have reliable and dependable report to our HQ in Japan on time.”
    Frankie Ong, Senior Manager of Sumiden International Trading (S) Pte Ltd
  • “Nicole (Or OS1 Pte Ltd) is one of the few professional accountants whom I’ve come across who is meticulous & detailed in her work. She listens attentively to our company’s needs, and able to advise us on various scenarios & alternatives choices for our company, be it for new set up or expansion. Her patience & valuable experience has also made us feel like she’s part of our business team, instead of just an accountant. Many times, she has extended extra effort to provide us with invaluable-added service, which has once again strengthen her comparative strength over others.”
    Kellin Chan – OIG International Pte Ltd
  • “Ms Nicole, not only get us registered, she’s to do and file our monthly CPF Contributions for our Employee (E-Filing) and update employee contributions when necessary in regards to their age limits and skills development Levy / Benefits. Objectivity to run the company smoothly with less “Paper Work”. If you want the same benefits, you should use O.S.1 Pte Ltd.”
    Mr Eddie H.P.Tan , Gloss & Glow Pte Ltd
  • “Nicole provides a very professional accountancy service. She’s extremely helpful, efficient, pleasant to do business with, goes above and beyond, and is prompt in returning e-mails. I would not hesitate to recommend her services.”
    Maimunah Alhabshi, Project Spirituality
  • “Nicole has always handled her work with responsibility and pride. She is also very neat and tidy with her work. Nicole is also very fast and quick in her all her work and always leave a very good impression in all her work. She is also very hardworking and devoted to her work. Therefore, I would want to thanks her for all her hard works and effort and congratulate for her new company.”
    KK.Teow, Director of Baker Deli One Pte Ltd

Let’s Build Your Business Together!

Take a few minutes and send us your requirements and we will be back with a solution.