Last reviewed: 30 May 2026

Quick summary

  • This guide is for someone who created a limited company for a side project and now has more turnover, profit or admin than expected.
  • Pin down company bank records, invoices, VAT threshold, Corporation Tax, payroll or dividends, director loans, pension plans and filing deadlines before asking for quotes or filing anything.
  • Use the checklist and examples below to make the accountant conversation specific.

Topic hub: Small business tax hub

Direct answer

You should not treat this as a broad accountancy question. The answer depends on the specific records, dates, thresholds and decision in front of you. Start by pinning down company bank records, invoices, VAT threshold, Corporation Tax, payroll or dividends, director loans, pension plans and filing deadlines, then decide whether this is a DIY task, bookkeeping task or accountant judgement call.

What this guide is focusing on

Use this guide if you created a limited company for a side project and now have more turnover, profit or admin than expected. Focus on the practical decision point: what to gather, what figure matters, what deadline is coming up and what to ask before paying for advice.

What figure, record or decision should you pin down?

Pin down company bank records, invoices, VAT threshold, Corporation Tax, payroll or dividends, director loans, pension plans and filing deadlines. This is the decision model for the page. If those items are unclear, the accountant conversation should start with organising the facts rather than jumping straight to a filing answer.

Records to gather

  • Companies House incorporation date
  • company bank statements
  • sales invoices and expenses
  • director withdrawals
  • VAT turnover and expected sales

Real examples for this situation

  • A PAYE worker opens a company for a side service and suddenly invoices GBP 30,000 in a few months. Salary, dividends and Corporation Tax need planning.
  • A company sells products and approaches the VAT threshold faster than expected. VAT timing and pricing come before the year-end accounts.
  • A director has used company money for personal costs. That may create a director loan issue to review quickly.

Mistakes to avoid

  • Treating company money as personal profit.
  • Waiting until accounts are due before checking VAT.
  • Taking dividends without checking available profit.
  • Mixing personal and company expenses.

Questions to ask an accountant

  • What are the first deadlines I need to know?
  • Have I created a director loan?
  • Should I register for VAT soon?
  • How should I take money from the company?
  • What records do you need before quoting?

What an accountant will actually check

An accountant will usually triage deadlines first: Companies House accounts, Corporation Tax, VAT registration, payroll, confirmation statement and any Self Assessment impact for the director. Then they will classify money taken from the company as salary, dividend, reimbursed expense or director loan. They may also check whether the company has enough profit for dividends, whether VAT registration is already due, and whether pension contributions or retaining profit in the company should be discussed. The first job is not clever tax planning; it is stopping company money and personal money from blurring.

What to stabilise first

When a side hustle suddenly accelerates, the first priority is not clever tax planning. It is preventing avoidable compliance problems. Check whether invoices are being issued by the company, whether customers are paying the company bank account, whether expenses are in the right name and whether you have taken money out in a way the accounts can explain.

After that, look forward. A company with rising sales may need VAT monitoring, payroll for director salary, dividend paperwork, bookkeeping software, corporation tax planning and a cash reserve. The accountant should help turn irregular income into a monthly routine you can actually keep.

The first 30 days after sudden growth

When a limited company side hustle grows quickly, the first 30 days should be about control. Make sure invoices are issued by the company, customers pay the company bank account, expenses are in the company name where possible, and every transfer to you has a label that can later become salary, dividend, expense reimbursement or director loan. Fast growth becomes expensive when the company bank account starts being treated like a personal wallet.

The next task is deadline mapping. A company can have Companies House filings, corporation tax, bookkeeping, payroll, VAT monitoring, confirmation statements and personal Self Assessment consequences for the director. You do not need to solve all of that on day one, but you do need a calendar and a cash reserve. If VAT registration is approaching, put the rolling turnover calculation into the same weekly routine as sales tracking.

Bring an accountant the bank feed, sales dashboard, invoices, expected monthly sales, current withdrawals and any software already used. Ask them to identify the first risk, the first deadline and the simplest monthly process that keeps the company compliant.

Extra accountant conversation point

Also decide what information you want monthly. A growing company should normally know sales, cash in bank, unpaid invoices, tax set-aside, director withdrawals and upcoming filing dates. This does not need to be complicated, but it does need to be consistent. If the company only looks profitable because VAT, corporation tax or unpaid supplier bills have not been allowed for, the director may take out too much too early.

Final practical check

Finally, decide what the company should stop doing. Stop paying personal subscriptions from the company card, stop taking irregular transfers without notes and stop delaying bookkeeping until year end. Those habits are manageable at side-hustle size, but they become expensive once sales rise.

Official guidance checked on 30 May 2026

Rules and thresholds can change. Check official guidance before important decisions.

Related guides

Sole trader vs limited company: which is better for taxDirector's loan account: what if I used company money personally?When should I register for VATSmall business tax hubSpeak to an accountant

FAQs

What should I prepare first?

Companies House incorporation date, company bank statements, sales invoices and expenses, director withdrawals, VAT turnover and expected sales.

When should I speak to an accountant?

Speak to an accountant when the answer affects registration, VAT, MTD, company money, deadlines, records cleanup, a tax return or a decision you are not confident applying to your own facts.

What is the main mistake to avoid?

Treating company money as personal profit.