Small Business Bookkeeping: What to Track and What to Ignore

Most bookkeeping advice fails for the same reason most fitness advice fails: it describes what a large, well-resourced version of you would do, and you are not that yet. You get told to set up a chart of accounts, reconcile weekly, track accruals, and categorise every transaction to two decimal places of precision, and after five weeks of that you stop, because none of it visibly did anything for you.

So start from the other end. Books are not a moral obligation. They are a machine for answering questions, and there are only five.

The five questions

1. Did I make money, and when? Not “is there cash in the account” — money in the account can be a deposit for work you haven’t done, or a client’s expenses passing through. Profit is revenue minus costs, in a period.
2. Who owes me money, and how long have they owed it? The single most common cause of a cash crisis in a profitable small business.
3. How much of the balance is actually mine? Some of that cash is tax. Some is bills that haven’t landed yet. The rest is yours.
4. What do I owe, and when is it due? Estimated tax, sales tax if you collect it, subcontractors, the annual insurance renewal you forget every year.
5. Can I substantiate it? If someone asks you to prove a deduction, can you?

Everything below is judged against those five. If a practice does not help answer one of them, it is optional for a business your size — and treating it as optional is what makes the rest of it survive contact with a busy month.

The eight columns that do the job

For a service business, a shop, a trade, or a freelancer, one table with eight columns answers questions 1 through 4 and most of 5:

That is it. One tab. Everything a small business needs to know can be derived from those eight fields, and the derivation should be automatic — a P&L by month, a list of unpaid invoices with their ages, a tax set-aside figure, a category breakdown. If you are typing the same number into two places, something is wrong with the setup, not with your discipline.

What to actually ignore

Accrual accounting, probably. Cash basis means you record income when the money arrives and expenses when they leave. Accrual means you record them when they are earned or incurred, regardless of cash. Accrual gives a truer picture of a business with inventory, long projects, or significant credit terms. For a small service business paid within thirty days, it mostly adds work and a permanent gap between your books and your bank balance. Cash basis is simpler, and for many small businesses it is also what you file on. There are eligibility rules and they depend on your entity and revenue — worth one conversation with an accountant, once, and then stop thinking about it.

Double-entry, as a manual practice. Debits and credits are a self-checking mechanism that catches errors in a system where transactions are entered by multiple people across many accounts. If you are the only person entering anything, a single-entry table plus a monthly bank reconciliation catches the same errors with a fraction of the effort.

A chart of accounts with eighty lines. Ten to fifteen categories, chosen so that every one either maps to a line on your tax return or is a decision you might actually make. “Software” is a category. “Software — design tools — annual” is a hobby. If you cannot say what you would do differently based on a category’s total, merge it into a bigger one.

Sub-cent precision on trivia. Splitting a $4 coffee three ways between three clients costs more attention than the deduction is worth. Round, categorise coarsely, move on.

Daily reconciliation. Once a month, against the statement, is enough for a business with fewer than a few hundred transactions a month.

Depreciation schedules for a laptop. Most small equipment purchases can be expensed in the year of purchase rather than depreciated over years. For 2026, 100% bonus depreciation is available for qualifying assets acquired after January 19, 2025 and used more than 50% for business, alongside the Section 179 election. Which mechanism is better for you is a question for whoever prepares your return — but “do I need a depreciation schedule” is usually answered “no” for a business buying laptops and phones rather than machinery.

The categories that are worth care

A small number of expense categories are worth being fussy about, because they are either commonly missed or commonly challenged.

Mileage. For a business that drives — trades, cleaning, deliveries, mobile services — this is frequently the largest deduction of the year and the one most often lost to bad records. Log the date, the destination, the business purpose, and the miles. Note that the 2026 standard mileage rate changed mid-year: 72.5 cents per mile for January 1 through June 30, and 76 cents per mile from July 1 onward. A mileage log that isn’t split by date will produce the wrong number.

Home office. Real and legitimate, with genuine conditions attached about regular and exclusive use. Record the square footage and the household costs once a year, not monthly.

Subcontractors. Anyone you pay for work may create an information-reporting obligation for you. Track what you paid whom, cumulatively, across the year, or you will be reconstructing it in January under time pressure.

Meals. Partially deductible, and the percentage has changed more than once in recent years — check the current rule for the year you are filing rather than carrying a number forward from an old article. Whatever the percentage, the record requirement is the same: who, where, and the business purpose.

Anything paid from a personal account. These are the deductions people lose entirely, because there is no statement to jog the memory. If it happens, enter it the same day.

Receipts: what you actually need

The requirement is substantiation, not paper. A card statement line proves an amount and a date; it does not prove a business purpose. So:

• Keep receipts for anything unusual, anything large, and anything where the business purpose is not obvious from the vendor name.
• A photo is fine. A folder per year, named by month, is fine. Thermal paper fades to blank in about eighteen months, so photograph anything you intend to keep.
• Write the business purpose on the photo or in the description column, at the time. You will not remember in March.
• Retention periods depend on the situation and are longer than most people assume in several cases. The IRS publishes a period-of-limitations table in its recordkeeping guidance; check yours against it rather than against a number you half-remember.

The monthly routine, in twenty minutes

1. Enter anything not already entered, from the bank feed or statement.
2. Check the closing balance against the statement. Investigate any difference immediately — a discrepancy is easy to find within a month and nearly impossible after six.
3. Look at the unpaid list. Chase anything past thirty days. This step alone repays the whole exercise.
4. Move the tax set-aside for the month into the tax account, if you are not already doing it per payment (which is better — see how much to set aside for quarterly taxes).
5. Look at three numbers only: profit this month, profit year to date, and total outstanding. Everything else is analysis, and analysis is a quarterly activity.

The three mistakes that cause the most damage

Mixing personal and business money. One business bank account, used for business only. This is not a tidiness preference — it is what makes every other step of bookkeeping take minutes instead of hours, and it is the difference between a clean audit and an argument.

Catching up once a year. A year of receipts in a shoebox in April costs more in accountant hours and lost deductions than twelve twenty-minute sessions cost in time, by a wide margin.

Building the perfect system. The best set of books is the one still being kept in month eight. A plain table you actually update beats sophisticated software you logged into twice — and if you do want software later, a year of clean, consistent rows is exactly what makes the migration painless.