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Sinclair Whelan Bookkeeping

For All of Your Bookkeeping and Accounting Needs

Sinclair Whelan Bookkeeping have been providing our clients with first-class accounting services since 2009. We take care of your bookkeeping and accounting needs so you don't have to.

We provide you with up to date information on your business finances and ensure that you are compliant with the latest HMRC regulations, taking the stress and worry away,  leaving you more time to focus on running your business and to enjoy your free time.

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  Practice Licence Number 8659

Sinclair Whelan Bookkeeping


Sinclair Whelan Bookkeeping provide a full range of bookkeeping services, including:
Virtual Accounts Department
Ledger Management
Credit Control
Bank Reconciliation
Management Accounts
VAT Returns
Cash Flow


Cloud accounting software set up

MTD (Making Tax Digital) set up

Bookkeeping to Trial Balance for Limited Companies, with accountant liaison or outsourced Annual Accounts and Corp Tax
Full service for Sole Traders including Self-Assessment Tax Returns

Data on a Touch Pad
Making Notes
Making Notes

Digital Bookkeeping

Legislation and HMRC requirements are constantly changing! We stay up to date on all the regulatory and legislative developments so you don’t need to waste time and energy trying to make sense of all the accounting complexities.

We can make sure that you are ready for Making Tax Digital (MTD) for both VAT and Income Tax Self-Assessment.

We use a range of MTD compatible software including Sage, Xero, Quickbooks and FreeAgent and can help you modernise your accounting systems and processes including moving towards a paperless office!

Contact us today and see how we can help you.

Financial Management and Daybook and Ledger Maintenance

We provide individualized services to help alleviate your financial uncertainty and stress. Our experience and knowledge gives us the expertise to provide you with the information to ensure that you are always able to make the best decisions when running your business, including cashflow forecasting, planning and mitigating for different scenarios and help with solutions.

We work hard to ensure your bookkeeping and accounts are kept up to date and that all your submissions to HMRC are made on time. 

We keep track of what your customers owe you and what you owe to your suppliers in order to help you manage your cash flow.

Self-Assessment Tax Returns

Dealing with an annual self-assessment tax return is often something that business owners and landlords dread, and it can be difficult to know which expenses are allowable and which are not.

I am an HMRC tax agent and am qualified and licenced to deal with your tax return on your behalf. You can provide me with your information and I will prepare and submit your tax return for you, making sure that you don't miss out on any allowances and reliefs that you are entitled to, and ensuring that you pay the correct amount of tax and NI.

With HMRC's Making Tax Digital around the corner for those sole traders and landlords with an annual turnover of £50,000 or more, and later £30,000 plus, we can make sure you are ready in time and take the stress and worry away.

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We are here to provide the best accounting services for our clients, giving them long-term strategies for financial success. We take away the stressful and time consuming aspects of ensuring that HMRC requirements and deadlines are met, so that you have more time to get on with running your business, spending time with your family or doing the things you enjoy. Contact us today.

About Us

Based in Billericay, Essex, Sinclair Whelan Bookkeeping was established in 2009 by Suzannah Whelan MICB PM. Dip,

shortly after qualifying as a Certified Bookkeeper with

The Institute of Certified Bookkeepers.

Suzannah has gone on to achieve ICB diplomas in

Self-Assessment Tax Returns and Payroll.

Sinclair Whelan Bookkeeping work with a wide variety of small businesses and individuals, providing a friendly, personal service, tailored to fit each client's specific needs.

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  Practice Licence Number 8659

Office Desk
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Contact Us

Suzannah Whelan MICB PM. Dip.

208 Mountnessing Road, Billericay, Essex, CM12 0EH

01277 623618, 07970 485330

Analysing the Numbers
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