Bookkeeping basics for small businesses: a simple system that keeps you tax-ready

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Bookkeeping is the habit of recording every bit of money that comes into and goes out of your business. Done regularly, it takes little time and tells you whether you are actually making money. Left until the tax deadline, it becomes a stressful weekend of digging through bank statements and shoeboxes of receipts. This guide covers the basics that apply almost everywhere. Tax and record-keeping rules differ by country, so check the details with your local tax authority or an accountant.

1. Separate business and personal money

Open a dedicated bank account for the business, and ideally a separate card. Even if you are a sole trader and the law does not require it, this is the single most useful step:
  • Every business transaction is in one place.
  • You do not have to sort through personal spending to find expenses.
  • It looks more professional to customers and makes any tax enquiry simpler.
Pay yourself by transferring money from the business account to your personal one, rather than spending business money directly on personal things.

2. Record income and expenses

For every transaction, note:
  • the date
  • the amount
  • who paid you, or whom you paid
  • what it was for, put into a category (sales, materials, rent, software, travel, advertising and so on)
  • any tax charged, such as VAT or sales tax, if you are registered for it
You can do this in a spreadsheet when you are very small. Bookkeeping software, which can link to your bank feed and suggest categories, saves time as the number of transactions grows, and some tax authorities expect records to be kept digitally. Whatever you use, be consistent with your categories so you can compare months.

3. Keep your receipts and invoices

You need evidence for the income you report and the expenses you claim.
  • Issue proper invoices with a unique number, date, your details, the customer's details, what was supplied, the amount and any tax.
  • Keep every receipt for business spending. Photograph paper receipts as soon as you get them; thermal paper fades.
  • Store them in an organised way, by month or by category, linked to the matching transaction if your software allows.
  • Find out how long you must keep records. Many countries require several years; the exact period varies.

4. Cash basis or accrual basis

There are two main ways of deciding when income and expenses count:
  • Cash basis: you record income when the money arrives and expenses when you pay them. Simple, and close to what your bank balance shows. Many very small businesses use it.
  • Accrual basis: you record income when you earn it (for example when you send an invoice) and expenses when you incur them, regardless of when cash moves. It gives a truer picture of performance when you have unpaid invoices, bills or stock, and larger businesses are often required to use it.
Which you may use, and any thresholds, depend on your country and business type. Choose one deliberately, check it is allowed, and stick to it.

5. Reconcile regularly

Reconciling means checking your records against your bank and card statements so they match. Monthly is a good rhythm; weekly if you are busy.
  1. Tick off every bank transaction against an entry in your books.
  2. Add anything missing.
  3. Investigate anything that does not match: duplicate entries, missing receipts, bank fees, refunds.
  4. Check the closing balance in your books equals the bank's.
Reconciling catches errors, missed income, fraud and forgotten subscriptions before they grow.

6. Keep an eye on the numbers

Your books are a management tool, not just a tax chore. Each month, look at:
  • Profit: income minus expenses.
  • Cash flow: what is coming in and going out, and whether you can pay upcoming bills.
  • Unpaid invoices: who owes you and for how long. Chase them promptly.
  • Tax set aside: move a portion of each payment into a separate account for tax so the bill is not a shock.

7. When to bring in a bookkeeper or accountant

Many owners do their own books at the start. Consider professional help when:
  • you are spending hours a week on it, or falling behind
  • you take on employees and need to run payroll
  • you need to register for VAT, GST or sales tax, or are close to the threshold
  • you are deciding on a business structure, such as becoming a limited company
  • you trade across borders, hold stock or have assets to depreciate
  • you have received a letter from the tax authority you do not understand
A bookkeeper typically handles the day-to-day recording and reconciling; an accountant usually prepares accounts and tax returns and advises on tax planning. Often the fee is offset by the time saved and mistakes avoided. Even if you file yourself, a one-off session at the start to check your setup is worth it. Rules on registration, deductible expenses, tax deadlines and record-keeping vary widely, so always confirm against your own country's official guidance. How do you keep your books, and what do you wish you had known at the start? Share your tips or questions in the comments.

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