What bookkeeping actually is
Bookkeeping is recording what came in and what went out, with enough detail that you can group it later. Accounting is the interpretation on top — tax positions, depreciation schedules, statutory filings. You can absolutely do your own bookkeeping and still hand an accountant a clean file at year end. In fact that's the cheapest arrangement available: accountants charge by the hour, and most of those hours are spent reconstructing records that were never kept.
The output you're aiming for is a profit and loss statement: revenue minus expenses, for a period. Everything else is detail in service of that one number.
Record five things per transaction
Every entry, revenue or expense, needs the same five fields. More than that is bookkeeping theatre; fewer and you'll be guessing in six months.
- Date — the date the money actually moved, not the invoice date.
- Amount — gross, in your reporting currency.
- Category — from a short fixed list you actually reuse.
- Description — what a stranger would need to identify it.
- Counterparty — the client who paid you, or the supplier you paid.
Build a category list you'll stick to
The single most common bookkeeping mistake is inventing a new category every week. Ten well-chosen categories beat forty precise ones, because the point of a category is comparison across months — and you can only compare what's named consistently.
A workable starting set for revenue: Sales, Services, Subscriptions, Consulting, Other Revenue. For expenses: Payroll, Office, Marketing, Software, Travel, Equipment, Insurance, Taxes, Legal & Accounting, Other. Add a category only when you've had to file three things under 'Other' that clearly belong together.
Separate the business from yourself — properly
Open a dedicated business bank account on day one, even as a sole trader where it isn't legally required. Mixing personal and business money is the thing that turns a two-hour year-end into a two-week one, and in a dispute or an audit it undermines the argument that the business is a distinct entity at all.
The same separation should hold in your software. Personal budgeting and business books answer different questions and should never be summed. If your tool shows you one combined 'net worth' figure that blends your grocery spend with your company's ad budget, that number is meaningless. IncomeWise keeps the two in fully separate workspaces with separate tables for exactly this reason — one subscription, two sets of books that never touch.
The monthly routine
Pick a fixed day — the first working day of the month is easiest to remember — and do these four things in order. It compounds: the second month takes half as long as the first.
- Enter anything you missed. Work from your bank statement so nothing is invented from memory.
- Chase unpaid invoices. Anything past its due date gets a short, unapologetic email today.
- Reconcile: does your recorded closing balance match the bank's? If not, the gap is a missing entry, not a rounding error.
- Read your P&L for the month and the one before it. You're looking for a category that moved sharply, not for perfection.
Know your three numbers
Revenue tells you whether you're selling. Net profit tells you whether the selling is worth doing. Burn rate — average monthly expenses — tells you how long you survive if revenue stops, which is the number that actually determines your risk appetite.
Track profit margin as a percentage, not just as a currency figure. A business growing revenue 40% a year while its margin falls from 30% to 12% is getting worse, and the raw revenue chart will hide that completely.
When to bring in a professional
Do your own bookkeeping. Get professional help for the moments where the cost of being wrong is high: your first tax filing, taking on employees, crossing a VAT or sales-tax registration threshold, raising money, or selling the business.
Handing over clean, categorised, month-by-month records is what makes that help cheap. It's the same work either way — the only question is whether you did it as you went, or paid someone to reconstruct it afterwards.