Chartered Certified Accountants · UK

Your numbers should help you grow.

Strategic accounting for growing UK businesses — not a once-a-year formality, but numbers you can actually run your business on.

Fixed monthly fees, no surprises Pick exactly what you need Real advice from a Fellow (FCCA)
Trusted by owner-run businesses across Manchester, Stockport & Cheshire · watch their stories ↓
Growth/Cash Flow/Profit/Tax
The Think Big difference

Most businesses see their numbers once a year — when it's too late to change them.

Year-end accounts filed on time are the bare minimum. They tell you what already happened — they don't help you decide what to do next.

Think Big flips that. We keep your numbers current, clear and forward-looking, so you can see what's coming, protect your cash flow, and make confident decisions while there's still time to act.

Compliance handled. Growth guided. That's the difference.

Who we work with

Built for ambitious, growing UK businesses.

If you've outgrown "just get the accounts done" and you want your numbers pulling their weight, you're our kind of client.

Scaling limited companies

Turning over enough that the numbers are getting complicated — and important. You need a partner, not just a filer.

Ambitious founders

You've got a plan to grow and you want the financial clarity — cash flow, profit, tax — to get there without nasty surprises.

Owners who want it handled

You'd rather spend your time running the business than wrestling spreadsheets and HMRC. So we take it off your plate.

Build your service · done for you

Pick exactly what you need. Nothing you don't.

Every Think Big plan is bespoke and a fixed monthly fee. Tick only the services your business actually needs — so you're never paying for things that don't apply, and nothing important gets assumed. Not sure? Start from a plan, then adjust.

Quick start:
How it works

Getting started is simple.

01

Discovery call

A free, no-pressure 20 minutes. We learn about your business and your goals, and tell you honestly how we can help — and what it costs.

02

We build your setup

Smooth onboarding, your software sorted, and everything moved across for you. Most clients are up and running within days, not weeks.

03

Numbers that drive decisions

Then it's ongoing: clean books, clear reports, proactive advice, and someone in your corner who actually picks up the phone.

One accountant, two ways to get help

Want it done for you, or want to do it yourself?

However hands-on you want to be, there's a route — and it's the same person behind both.

Done for you

Think Big Accounting Limited

Hand it over. We run your accounting, tax and advisory so you can focus on growing — with a real accountant guiding the numbers.

You're in the right place →
Do it yourself

Start Sharp

Just starting out or happy to DIY? Start Sharp gives you the plain-English guides and tools to get your business set up right, yourself.

Visit startsharp.co.uk →
Mellissa Dean, FCCA — founder of Think Big Accounting
Think B!g. Be B!gger!

Hi, I'm Mel — the accountant who wants your numbers working for you.

I'm Mellissa Dean, a Chartered Certified Accountant (FCCA) and the founder of Think Big Accounting. I started Think Big because too many good businesses were being let down by accountants who file the accounts and disappear.

I do it differently: modern, tech-enabled, and genuinely involved in helping your business grow. When we work together, you get me — not a call centre — and numbers you can actually make decisions with.

Making Tax Digital · mandatory from April 2026

MTD for Income Tax is coming. Don't get caught out.

If you're self-employed or a landlord earning over £50,000, quarterly digital reporting becomes mandatory from April 2026 (£30k from 2027, £20k from 2028). We'll get you ready — and turn it from a headache into an advantage.

Get MTD-ready →
In their words

Real people. Real businesses.

"

I have worked with Mel and found her professional, offering straightforward, excellent accounting advice. Mellissa is always personable, approachable, clear in communication and always delivers on time. I highly recommend working with Mel.

Rob · CJD Building Projects
"

I wouldn't hesitate to recommend her. She provides excellent accounting advice and support, but I see her as much more than an accountant — a trusted advisor who has helped me navigate some challenging and stressful business changes, always making things feel more manageable. Thorough, approachable and incredibly patient, taking the time to explain things in a way that makes sense to a very non-finance person like myself!

Emma · Fays HR Department
"

Mel has been incredible with her insight and helpfulness. I set up initially as a sole trader, and as my business has progressed, we have planned the next steps. Now I am a limited company, after assessing the benefits and the comparisons from one to the other. It was an easy decision, with Mel to talk me through the whole process.

Chris · UHP Services, Manchester
"

Mel has been an incredible source of information for me and my business. She has taken the time to understand what I do and how she can maximise my position. We've discussed life goals, business goals and aligned the two, so I have real clarity on how I want to take my business forward. No question is ever too small and she answers without the jargon, so I'm fully aware of the situation at all times.

Arun B · Ophthalmologist

Video testimonials — hear it first-hand from three clients:

Paul Masterson · Bowdon Homes
Paul Simon · Bowsall
Michael Clough · JKSL
Let's talk

Ready to make your numbers work harder?

Send a quick message and I'll come back within one working day — no jargon, no pressure, just an honest chat about where your business is headed.

Prefer to grab a time now? Book straight into my calendar →

hello@thinkbigaccounting.co.uk  ·  Manchester & UK-wide

By sending this you agree we can contact you about your enquiry. We'll never share your details.

Opening your booking with Mel in a new tab — just pick a time that suits and you're set. Prefer email? hello@thinkbigaccounting.co.uk.