Good bookkeeping means recording every business transaction in a separate set of accounts, reconciling those accounts to your bank and credit card statements every month, and keeping the documents behind each entry. Done monthly, it gives you an accurate picture of profit and cash and turns tax season into a short exercise rather than a reconstruction.
Bookkeeping is not glamorous, but it is the foundation everything else in your business finances rests on. Your tax return, your loan application, your pricing decisions and your ability to sleep at night all depend on whether the numbers in your books are current and correct. The good news is that the habits are simple. They just have to be consistent.
What does bookkeeping actually include?
Bookkeeping is the routine recording and organizing of your business’s financial activity: money in, money out, what you own and what you owe. It feeds the three reports that matter most:
- The profit and loss statement, which shows whether you made money over a period.
- The balance sheet, which shows what the business owns and owes on a given day.
- The cash flow picture, which shows where cash actually went, and why profit and cash are rarely the same number.
Accounting is what you do with those reports: interpreting them, planning taxes, forecasting and making decisions. Clean bookkeeping is what makes that possible.
Cash or accrual: which method fits?
Under cash accounting, you record income when the money arrives and expenses when you pay them. It is simple and matches your bank account, which is why most small service businesses use it.
Under accrual accounting, you record income when you earn it and expenses when you incur them, regardless of when cash moves. It takes more work, but it shows true profitability for businesses with inventory, significant unpaid invoices or bills, or lenders who require it.
Whichever you choose, use it consistently. Switching back and forth makes month-to-month comparisons meaningless.
The mistakes that cost Denver businesses the most
Mixing personal and business money. This is the most common problem and the most expensive to untangle. Open a separate business checking account and credit card on day one and run every business transaction through them. Personal purchases on a business card turn into hours of cleanup and, in an audit, questions about everything else.
Falling months behind. Reconciling one month takes a fraction of the time it takes to reconstruct six. Errors also compound: a duplicate charge or a missed deposit is easy to spot in a single month and nearly invisible in a year.
Losing the paper trail. Bank statements show that you spent money, not what you bought or why. Snap a photo of each receipt, attach it to the transaction in your software and note the business purpose for meals and travel. The IRS explains how long to keep records: generally three years after filing, four years for employment tax records and seven for bad debt deductions.
Treating sales tax as revenue. Sales tax you collect belongs to the state and the city. For illustration, a Denver shop with $600,000 of taxable sales that records roughly $50,000 of collected sales tax as income overstates its revenue by that amount, and may pay income tax on it. Record collected tax as a liability and clear it when you file each return.
Ignoring receivables. If customers pay on terms, review unpaid invoices every week. A receivable that is 90 days old is far harder to collect than one that is 30.
Not tracking contractors. Collect a Form W-9 before you pay any contractor. For payments made in 2026, you generally issue a Form 1099-NEC to a contractor you paid $2,000 or more, up from $600, according to IRS Publication 15. The forms are due February 1, 2027 this cycle, and chasing W-9s in late January is stressful.
A monthly close routine you can keep
This is the routine we recommend to clients who keep their own books. It takes an hour or two when the month is current.
- Categorize every transaction from your bank and credit card feeds, attaching receipts as you go.
- Reconcile each account to the month-end statement. The reconciled balance should match the bank to the penny.
- Review unpaid invoices and bills. Follow up on anything past due.
- Record payroll from your payroll reports, including employer taxes, if your software does not post them automatically.
- Set aside tax money. Move sales tax collected, payroll tax and a percentage of profit for income tax into a separate account.
- Read your profit and loss statement. Compare it with last month and the same month last year. Anything that looks surprising usually is an error or a signal worth understanding.
A few Denver and Colorado details
Denver businesses have some local items to build into the books. The city’s Occupational Privilege Tax is withheld from qualifying employees and paid by the business each month or quarter. Denver sales and use tax is filed with the city separately from state sales tax. And business equipment needs to be tracked by purchase date and cost for the April 15 business personal property declaration. Our page on Denver business taxes covers each one.
If you or your employees drive for work, keep a dated mileage log. The IRS standard mileage rate changed mid-2026, from 72.5 cents a mile for January through June to 76 cents from July 1, so the dates matter for this year’s deduction.
Should you do it yourself or hire help?
Doing your own books makes sense when the business is small, transactions are few and you enjoy it. It stops making sense when any of these are true:
- It takes more than a few hours a week.
- The books are regularly more than a month behind.
- You are not confident the numbers are right.
- You are making decisions about hiring, pricing or borrowing and want numbers you can trust.
An outsourced bookkeeper usually costs far less than a full-time hire and brings experience across many businesses. A useful way to decide is to put a price on your own hour. If an hour of your time is worth more spent on customers or sales than on categorizing transactions, the math often favors handing it off.
When the books are clean and you want more from them, such as forecasts, budgets and a regular review of the numbers, that is the point where a virtual CFO starts to earn its place.
Our accounting and bookkeeping team keeps books current for businesses across the Front Range, and our payroll team handles the payroll side so the two always tie out.
Common questions
How often should I do my bookkeeping?
Record transactions at least weekly and reconcile every bank and credit card account monthly. A monthly close takes an hour or two when it is current, and days when it is six months behind.
Should my small business use cash or accrual accounting?
Cash accounting records income when you are paid and expenses when you pay, and it suits most small service businesses. Accrual accounting records them when they are earned or incurred, which gives a truer picture of profit for businesses with inventory, large receivables or lenders who ask for it.
How long do I need to keep receipts and records?
The IRS general rule is three years after filing, but keep employment tax records for at least four years and records supporting a bad debt or worthless securities deduction for seven. Keep records indefinitely for any year you did not file.
When should I hire a bookkeeper?
Consider it when the books take more than a few hours a week, when they are regularly more than a month behind, or when you are not confident the numbers are right. Those are signs the cost of doing it yourself is higher than it looks.
Do I need to track sales tax separately from revenue?
Yes. Sales tax you collect belongs to Colorado and Denver, not to your business, so it should be recorded as a liability until you remit it. Booking it as revenue overstates your sales and can lead to paying income tax on money that was never yours.