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How to Thrive in Your
First 100 Days in Business

4 min read
February 19, 2026

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Your first 100 days in business can feel exciting, overwhelming and confusing all at once!

With the right foundations, you can turn those early weeks into a confident start.

This roadmap gives you a simple structure to follow from Day 1 to Day 100.

1. Set-up and choose a structure (Days 0-30)

Before you start selling, marketing or building your brand, you need to settle on which type of business you’re running and what the financial and legal implications are for you.

 

Choose the right business structure

Most founders start as either:

  • Sole traders: simple, flexible and great for sub-contractors, hairdressers, tutors or other trades
  • Limited companies: benefits of limited liability and improved credibility, but comes with more responsibilities

Your structure affects your taxes, responsibilities and how you pay yourself, so it’s worth getting this part right.

 

Register your business correctly

Depending on your structure, that may include:

  • Registering as a sole trader with HMRC
  • Incorporating a Limited Company on Companies House
  • Setting up PAYE if you plan to pay yourself through payroll
  • Registering for VAT (if you meet the threshold or want to register voluntarily)

 

Open a business bank account

Separating your personal and business finances makes everything easier – bookkeeping, tax returns, cashflow and compliance.

 

Know your responsibilities

These include:

  • Annual Companies House filings
  • Annual Self Assessment tax returns
  • Bookkeeping essentials
  • Record-keeping requirements for Directors

Speak to an accountant early on if you feel unsure about your responsibilities.

2. Understand your numbers early (Days 20-60)

Numbers don’t need to be scary – in fact, understanding your profit margins and cash flow can be the key to your business’s success.

 

Set up bookkeeping from day one

This can be a simple spreadsheet, accounting software or a hybrid system if you take cash.

The goal is to track:

  • Income
  • Expenses
  • Bank transactions
  • Any money you take out of the business
  • Any money you put in

This makes your annual accounts and tax filings much easier!

 

Understand cash vs profit

These two numbers don’t always match: knowing the difference helps you avoid overspending just because your bank balance looks healthy.

 

Know your key financial dates

Depending on your structure, these may include:

  • Companies House filings
  • Self Assessment deadlines
  • Payroll dates
  • VAT payments (if relevant)

We recommend keeping a financial year calendar. We can provide you with a personalised list of your annual deadlines.

 

Price with intention

Your prices need to reflect:

  • Your costs (fixed and variable)
  • Your time and expertise
  • Market value
  • Your profit needs

Pricing is not a one-time decision: your first 100 days are a chance to check whether those prices work for you and your customers.

3. Customers, offers and pricing (Days 40-80)

Once you’re legally set up and understand your numbers, your next focus is attracting and serving your customers.

 

Have a target audience in mind

Creating an Ideal Customer Profile (ICP) can help you clarify:

  • Who your offer is for
  • What problem you solve
  • What benefits you bring to clients

When you’re clear on this, your marketing messaging is targeted, relevant and resonates with your audience.

Having clarity around your ICP also helps you target the high-return clients.

 

Test your offer early

In your first 100 days, progress is better than perfection.

Get feedback, ask questions, pay attention to what people actually want, not what you think they want.

The best people to ask are your existing clients: what do they value about your service? You can then use this to attract more customers.

 

Keep marketing simple

Choose maximum 3 platforms that your ICP actually uses rather than spreading yourself too think.

 

Build trust and be transparent

In your early days, particularly if you’re a solopreneur, people buy you as much as they buy your product or service.

Showing your process, mission, values and wins builds trust and authenticity.

4. Review, refine and realign (Days 80-100)

 

The strongest businesses reflect early and regularly. The first 100 days give you enough experience to see what’s working and what needs tweaking.

Review your set-up

  • Are you still building towards your goals?
  • Are there registrations/subscriptions you need to implement to better serve your customers?

 

Review your finances

With an accountant if needed, look at:

  • Cash flow
  • Income
  • Expenses
  • Pricing
  • Profit

Are you on track or do you need to adjust?

Review your customers and marketing

  • Who engaged?
  • Who paid?
  • What did they love?
  • What confused them?

 

Re-strategise

Plan ahead for the next 100 days, making one or two small tweaks and building from there.

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Your first 100 days set the tone for your business’s future.

With the right support, the journey is exciting, not overwhelming.

At Thickbroom Enterprise CIC, we help you to navigate the legal and financial responsibilities of establishing and maintaining a business in the UK, without the price tag.

We provide:

  • A free 1-hour session with a qualified accountant, tailored to your business needs.
  • A comprehensive Start-Up Support Booklet to guide you through your first year.
  • A follow-up call to check on your progress.

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