Bookkeeping Basics for a New Business

Bookkeeping basics for a new business come down to five habits: separate your money from the business's money, record every dollar in and every dollar out, save your receipts and mileage as you go, know the difference between income, expenses, and profit, and reconcile your accounts every month. None of this requires an accounting degree. It requires a system, a little discipline, and about an hour a week.

Good books aren't a chore you do for the IRS. They're the tool that tells you whether your business is actually making money, they're what a lender or landlord will ask to see before extending you credit, they're what makes filing taxes and paying quarterly estimated taxes possible instead of terrifying, and — if you've formed an LLC or corporation — sloppy books that mix your money with the business's money can help a court "pierce" your liability shield and put your personal assets back on the table. Bookkeeping is boring until the day it saves you.

Step one: separate business and personal money

Open a dedicated business checking account, and a business credit or debit card, before you take your first dollar of income. Run every business transaction through those accounts and nothing else. This single habit does more for your recordkeeping than any app or spreadsheet.

• It protects your liability shield. If you formed an LLC or corporation specifically so your house and savings aren't on the hook for a business debt or lawsuit, commingling funds is one of the fastest ways a court can disregard that separation. Sole proprietors and general partners don't have this shield in the first place — they're personally liable for business debts regardless — but separate accounts still make their books far easier to trust and defend.
• It makes tax time sane. When personal groceries and business supplies run through the same card, you (or your bookkeeper) end up reconstructing months of transactions from memory. Separate accounts mean your bank statement is already most of your bookkeeping.
• It's what a bank, landlord, or lender will expect to see. Clean, separate business financials are usually a baseline requirement for a business loan or line of credit.

If you're paying yourself, do it deliberately — a transfer from the business account to your personal account, recorded as an owner's draw or payroll, not by using the business debit card for personal errands.

Track every dollar in and out

At the simplest level, bookkeeping is a running log of every transaction: the date, the amount, who it was to or from, and what it was for. You can keep that log in bookkeeping software, in a spreadsheet, or on paper — what matters is that you actually keep it, consistently, close to the time each transaction happens rather than reconstructed from memory in April.

For each transaction, you generally want to capture:

• Income: what you were paid, by whom, and for what — plus whether it's been deposited yet.
• Expenses: what you bought, from whom, and which category it falls into (supplies, rent, software, advertising, professional fees, and so on).
• Mileage, if you use a vehicle for business: date, starting and ending odometer reading or trip distance, and business purpose. A simple mileage log app or a paper notebook kept in the car both work — what matters is that the log is contemporaneous, not reconstructed later.

Keep the receipts, not just the totals

A bank or credit card statement shows that money moved. It usually doesn't show what you bought or why it was a legitimate business expense. If you ever need to substantiate a deduction, the IRS generally wants documentary evidence — a receipt, invoice, or similar record — not just a line on a statement. A photo of a paper receipt, saved to a labeled folder or a receipt-scanning app the moment you get it, is enough for most people. The habit that fails people isn't a lack of technology; it's letting a shoebox of receipts pile up untouched for a year.

How long you need to keep records, and exactly what documentation the IRS expects for a given deduction, depends on the type of record and your situation — the general rule of thumb is a few years from when you filed the related return, but it runs longer in some circumstances (for example, if you underreported income or claimed a loss on bad debt or worthless securities) and indefinitely if you never filed a return at all. Don't guess on this one — irs.gov spells out the specific retention periods for different situations, and it's worth five minutes to check rather than shredding something you'll need later.

Income, expenses, and profit — the three numbers that matter

These three ideas are simple, but a lot of new business owners run into trouble by mixing them up:

• Income (or revenue) is everything the business brings in before you subtract anything.
• Expenses are what it costs to run the business — supplies, rent, subcontractors, software, insurance, and so on.
• Profit is what's left after you subtract expenses from income. Profit is what you actually made — and it's usually the number that matters for taxes, not the cash sitting in your account on any given day.

A business can have plenty of cash in the bank and still not be profitable — for example, if you just got paid for three months of work up front. It can also be profitable on paper and still be short on cash, if customers are slow to pay or you just made a big equipment purchase. Bookkeeping is what lets you see both pictures instead of just guessing from your bank balance.

Cash basis vs. accrual basis, at a glance

These are the two common ways to decide when a transaction counts:

• Cash basis counts income when you actually receive the money and expenses when you actually pay them. It's simpler and it's what most small, service-based businesses and sole proprietors use.
• Accrual basis counts income when you earn it (like when you send an invoice) and expenses when you incur them, regardless of when cash actually changes hands. It gives a more accurate month-to-month picture of profitability, but it's more work to maintain, and it can mean owing tax on income you haven't collected yet.

Most very small and new businesses start on the cash basis because it's easier to keep and easier to understand. As a business grows — carries inventory, extends credit to customers, or gets larger — accrual accounting often becomes more useful, and in some cases required. This is exactly the kind of decision worth a conversation with a CPA rather than guessing, since it affects how and when you owe tax.

Reconcile every month

Reconciling means comparing your own bookkeeping records against your actual bank and credit card statements to make sure they match — and if they don't, figuring out why. Set aside time once a month (many owners do it the same week each month, right after statements close) to:

1. Pull up your bank and credit card statements for the period.
2. Compare every transaction against what's recorded in your books.
3. Investigate anything that doesn't match — a missed entry, a duplicate charge, a fee you forgot to record, or an error.
4. Confirm your ending book balance matches your ending statement balance.

Monthly reconciliation is what catches a bookkeeping error, a bounced check, or even fraud while it's still a small, fixable problem instead of a year-end surprise. It's also what makes your books reliable enough to actually use — for estimating quarterly taxes, for deciding whether you can afford to hire, or for handing to a lender.

Why this matters beyond taxes

• Filing your tax return. Whether you're a sole proprietor reporting on Schedule C, or an LLC or corporation filing its own return, your books are the source for every number that goes on the form.
• Paying estimated taxes. Self-employed people generally pay both the employee and employer share of Social Security and Medicare tax — self-employment tax, currently 15.3% (12.4% for Social Security, up to the annual wage base, plus 2.9% for Medicare) — and because no employer is withholding tax from a paycheck, most self-employed people need to pay estimated tax to the IRS during the year rather than in one lump sum at filing time. You can't estimate what you owe if you don't know what you've earned. Exact due dates and thresholds for who must pay estimated tax can vary by situation — irs.gov has the current schedule and rules.
• Claiming deductions you're entitled to — including, for many pass-through business owners, the qualified business income (QBI) deduction under Section 199A, which can allow a deduction of up to 20% of qualified business income. What counts, and who qualifies, has real limits and exceptions, so this is a good one to run past a CPA rather than assume.
• Getting a loan or line of credit. Lenders want to see organized financials, not a shoebox.
• Protecting your liability shield if you've formed an LLC or corporation. Keeping the business's finances genuinely separate and well-documented is part of what keeps that shield intact.

Software, a bookkeeper, or a CPA — who do you actually need?

These aren't mutually exclusive, and most small businesses use some combination:

• Bookkeeping software (there are many options at different price points) is usually the right starting point for almost anyone running a business. It can connect to your bank and credit card accounts, categorize transactions, and generate basic reports. It does the recording and organizing — it doesn't make judgment calls.
• A bookkeeper is who you bring in when you'd rather not do the month-to-month data entry and reconciliation yourself, or when your transaction volume has outgrown a few minutes a week. A bookkeeper keeps your records accurate and current; typically they don't file your taxes or give tax advice.
• A CPA (certified public accountant) or other qualified tax professional is who you want for tax strategy, entity and tax-classification decisions, preparing and filing your return, and anything with real money or legal consequences riding on getting it right — like whether cash or accrual accounting fits your business, how to handle a good year with a large tax bill coming, or a deduction you're not sure you qualify for.

A reasonable path for a lot of new business owners: use software from day one to build the habit of tracking everything, bring in a bookkeeper once monthly reconciliation starts eating hours you don't have, and talk to a CPA at least once a year — and definitely before your first tax filing as a business. The IRS and the U.S. Small Business Administration (SBA) also offer free resources, and SBA-connected Small Business Development Centers offer free or low-cost one-on-one guidance, which can be a good starting point if you're not ready to pay for a bookkeeper or CPA yet.

What to do this week

1. Open a separate business bank account and card if you haven't already, and stop running personal expenses through business money (and vice versa).
2. Pick one system — software, a spreadsheet, or a notebook — and start logging every transaction the day it happens.
3. Start a mileage log if you drive for the business at all, even occasionally.
4. Set up a simple habit for saving receipts the moment you get them — a folder, an envelope, or a scanning app.
5. Put a recurring reminder on your calendar to reconcile your books against your bank statements once a month.
6. Confirm current recordkeeping retention guidance and any deadlines that apply to you at irs.gov, and talk to a CPA before your first tax filing if you haven't already.

A note on scope: if your business already owes more debt than it can handle, business bankruptcy and personal-guarantee questions are covered in our bankruptcy content — good books are exactly what you'll need if that conversation ever comes up. And if you're deciding how to classify the people helping you in the business, that's a separate — and important — legal question from bookkeeping, covered in our hiring and employment content.

This is general information, not legal, tax, or financial advice. For guidance specific to your business, talk to a qualified CPA, bookkeeper, or attorney, and confirm current figures and deadlines at irs.gov and sba.gov.