For SME owners, whether your business is just starting out or already growing, managing your finances is the heart of success. One of the most powerful basic tools is the "income and expense record", which gives you a clear overview of your finances.
This article from YMTD, an accounting firm in Chiang Mai, takes you through what an income and expense record is, why SMEs need one, 5 easy steps you can start right away in 2026, and tips that will make your business finances more organised, so you are ready for every situation and can make smart business decisions.
What is an income and expense record? The essential basics for SMEs [2026]
An income and expense record is a financial record showing where money comes in (income) and where it goes out (expenses) for a business over a given period. Its purpose is to track, check and summarise all cash flowing in and out, so that the owner can see the true financial position of the business.
Put simply, it is the business's own financial notebook. It tells you how much money came in each day, month or quarter and what it was spent on. This information is the foundation of short-term and long-term financial planning, helps you assess operating performance, and lets you control expenses effectively.
Why do SMEs need an income and expense record? It matters more than you think
It may seem like a small thing, but keeping an income and expense record is vital to the survival and growth of an SME in many ways. It is not just writing down numbers; it builds a solid foundation for your business:
- See the overall cash flow: You will know where money comes from, where it goes and how much is left, so you can manage liquidity well without worrying about running short.
- Control expenses: When you can see every expense item, you can analyse them and find ways to cut unnecessary costs and use money more efficiently.
- Basic tax planning: Systematic recording of income and expenses is the foundation for preparing your tax filings, so the tax is calculated correctly and the risk of fines is reduced.
- Business decisions: Clear financial information lets you make important decisions on a sound basis, such as whether to invest more, whether to open another branch, or how to adjust your sales strategy.
- Prepare for loan applications: Financial institutions usually ask for financial documents to assess your ability to repay. A well-kept income and expense record adds to your credibility.
- Assess profit and loss: Although it is not a profit and loss statement as such, it is excellent raw data showing whether your business made a profit or a loss in each period.
If you are looking for help managing these matters, or want professional accounting and tax advice, YMTD, an accounting firm in Chiang Mai, is ready to provide advice and a full range of services so your business can grow on a solid footing.
5 easy steps to start an income and expense record for your SME
Starting an income and expense record is not as hard as you might think. Just follow these 5 steps and you will have an organised financial system:
Step 1: Understand the basics and choose a recording format
The first thing is to understand what counts as income and what counts as an expense from your business's point of view. For example, income may come from sales of goods, services or interest, while expenses may be rent, staff wages, raw materials, marketing and so on. Then choose how to record them:
- Account book / notebook: Suitable for very small businesses with simple transactions; written by hand, recorded by date.
- Spreadsheet (Excel/Google Sheets): Very popular with SMEs because it is easy to use, flexible, and lets you build formulas.
- Accounting software: For businesses whose transactions are becoming more complex and that need a wider range of functions, such as inventory tracking and invoicing, which saves time and reduces errors.
Whichever format you choose, consistency is the key to recording.
Step 2: Gather the key documents and evidence
Every income and expense item must have supporting documents to confirm it is correct and allow it to be checked later. The things you need to gather are:
- Income: receipts, sales tax invoices, invoices, contracts, transfer slips (from customers)
- Expenses: receipts, purchase tax invoices, cash bills, payment vouchers, transfer slips (to suppliers), evidence of wage/salary payments
Store these documents systematically, perhaps by type or by month, so they are easy to find and check later.
Step 3: Record income and expenses systematically and consistently
Once you have all the documents, start entering the data in the format you chose. The information to record for each item is:
- Date: the date the transaction occurred
- Item: a short description of what the expense was for or where the income came from (e.g. shop rent, raw materials, sales of product A)
- Type: whether it is income or an expense
- Category: separate income (e.g. sales revenue, other income) and expenses (e.g. administration, marketing, labour, utilities)
- Amount: the actual amount received or paid
- Notes (if any): any additional details needed
Example of a simple record table:
| Date | Item | Type | Category | Amount (baht) |
|---|---|---|---|---|
| 1/1/2026 | Sale of product A | Income | Sales revenue | 10,000 |
| 2/1/2026 | Office rent | Expense | Fixed costs | 8,000 |
| 3/1/2026 | Purchase of raw material B | Expense | Raw materials | 3,500 |
Step 4: Categorise and summarise the data for analysis
After recording for a while, for example at the end of every month, total up each category of income and expenses. You will get a clearer overall picture:
- Total income: where did it come from?
- Total expenses: what took the most?
- Balance: total income - total expenses
Good categorisation helps you pinpoint which expenses are too high, or which income streams give the best return. This summary is what makes an income and expense record more useful than just a list of entries.
Step 5: Check, analyse and put the data to use
After summarising the data, the most important thing is to put it to use:
- Check accuracy: Compare the totals with the balance in your bank account or cash on hand to make sure there are no errors.
- Analyse: Ask yourself "Did the business make a profit or a loss this month?" "Which expenses rose or fell unusually?" "Where else could income be increased or expenses reduced?"
- Plan: Use the data to plan your finances ahead, such as setting a budget for next month, planning investments, or preparing for festive periods when sales may fluctuate.
Doing this regularly helps you understand the financial mechanics of your business and adapt in good time.
Common mistakes SMEs should avoid when keeping an income and expense record
Although the steps look simple, SMEs often run into certain mistakes that can affect the accuracy of the data:
- Not recording consistently: Letting entries pile up for days leads to forgotten details or recording errors.
- Lost or incomplete documents: Without evidence to support income and expenses, the data is unreliable and causes problems in an audit.
- Mixing personal and business money: A classic mistake that makes it impossible to separate and evaluate the business's results.
- No categories, or categories without any rules: Makes summarising and analysing the data difficult or useless.
- Neglecting to check and analyse: Recording only, without using the data, is a waste of time.
If you find that managing your income and expense record is a hassle and takes up too much time, to the point that such mistakes may occur, consulting a specialist is a good option. YMTD, an accounting firm in Chiang Mai, is ready to advise you and organise your accounting into a proper system, so you have time to focus fully on growing your core business.
Summary and next steps with YMTD Accounting Partner Chiang Mai
Starting an income and expense record is a vital first step for every SME in 2026 and the years ahead. An organised financial system not only shows you the true state of your business, but is also an essential tool for planning, control and decision-making for sustainable growth.
Do not wait to start your income and expense record today. Even a simple start will make an enormous difference to your business. And if you need further help, or are looking for a reliable and expert accounting firm in Chiang Mai, YMTD Accounting Partner Chiang Mai is pleased to offer advice and manage your accounting end to end, so you can stop worrying about tax and accounting and move steadily towards success.
Contact YMTD Accounting Partner Chiang Mai:
Tel: 081-542-3019
LINE: @ymtd
