M&M Financials

IMPORTANT INFORMATION · CONCEPTS

Bookkeeping Best Practices for Small Business

Most tax-season headaches come from bookkeeping gaps that built up across the year. The right discipline — captured in an hour a week and thirty minutes a month — eliminates 90% of the spring scramble.

Bookkeeping is the discipline that makes every other financial decision easier. Good books save you tax, support borrowing, and let you retire without a forensic accounting project at the back end. Below is the operating system we set up for the small-business clients we work with monthly.

The foundation — every business, every size

The chart of accounts: the under-appreciated lever

A well-designed chart of accounts turns the books into a decision tool rather than a tax compliance file. Aim for 30–80 active accounts grouped into assets, liabilities, equity, income, cost of goods sold, and expenses. Too few loses detail. Too many spreads activity into useless sub-accounts that nobody reads.

Mapping principle

Each tax-return line should have one (or at most two) accounts feeding it. If you're doing detective work at April close to figure out what goes where, the chart needs an adjustment. The goal is to look at a P&L and instantly know what schedule each item will land on.

The monthly rhythm that works

Most owners think bookkeeping takes 'an hour a week.' In practice, ours takes about 15 minutes of bookwork weekly plus a 90-minute monthly close. The week-over-week version is high-touch and inconsistent; the monthly rhythm works.

Week of the monthActivityTime estimate
Week 1Collect and categorize all transactions from prior month.2 hours
Week 2Reconcile every bank and credit-card account. Investigate uncleared items.1 hour
Week 3Review P&L vs. budget and prior-month variance. Note one or two insights.30 minutes
Week 4Pay any quarterly estimated tax; archive receipts; close the month.1 hour

Bank and credit-card reconciliation

Reconciliation is the single most important step. A reconciled account has every cleared transaction matched to a category with a vendor or memo. An unreconciled account is just guesses with timestamps. The IRS auditor's first move on every audit is a side-by-side comparison of bank statements to the books — discrepancies are where findings start.

Receipt management

Most modern platforms let you snap a photo or email a receipt directly into the matching transaction. The discipline matters: every transaction over $75 (a defensible threshold) should have either a digital receipt attached or a clear note explaining the expense. The IRS doesn't require receipts for every small purchase, but examiners routinely disallow deductions when documentation is missing or post-hoc.

Cash vs. accrual accounting

Cash accounting recognizes income when received and expenses when paid. Accrual accounting recognizes both when earned or incurred, regardless of cash movement. Most small businesses on cash basis for tax purposes find it intuitive, but accrual books are usually more useful for management decisions. The two can coexist: file cash-basis returns and review internal statements on the accrual side.

Two important cautions: inventory is generally required to use accrual accounting, and Section 447 forces certain businesses (tax shelters, large farm corporations) into accrual. Inventory and the related cost-of-goods-sold calculation deserve their own monthly attention — outside this guide but high on the list of 'find out before year-end.'

Owner-specific patterns to handle cleanly

1099 preparation

January is 1099-prep month. Pull a vendor report from the books by December 31. Cross-check each vendor against the W-9 on file; chase missing TINs. Issue 1099-NEC for any non-corporate contractor paid $600+ for services during the year. File with the IRS by January 31 (paper) or March 31 (e-file). Don't forget mid-year contractor onboarding — the W-9 should be captured before the first payment, not after $5,000 has flowed.

Year-end close checklist

  1. Final reconciliation of every bank, credit-card, and loan account.
  2. Inventory count and COGS adjustment (if applicable).
  3. Review fixed-asset accounts and book depreciation entries.
  4. Review accrued expenses for unpaid invoices that should be deducted.
  5. Issue 1099-NEC and 1099-MISC forms where required.
  6. Confirm payroll has been finalized and submitted for the year.
  7. Send the books to the CPA with a one-page memo of year highlights.

The one-page memo

Send your CPA one page at year-end: highest revenue month, biggest unexpected expense, owner draws total, large purchases, new employees or contractors, and any anticipated changes for next year. This memo alone often surfaces planning items that take years to discover without it.

Do I need a bookkeeper if I already use a CPA for taxes?+

Almost always yes, unless you enjoy doing it yourself. The CPA's role is to reconcile the year against tax law and prepare returns. The bookkeeper's role is keeping the books current and accurate month-to-month. The two roles overlap at year-end but are distinct for most of the year.

How do I clean up neglected books that are years behind?+

We open a date-bridge account, post a balance-sheet clean-up entry as of the start of the current year, and work forward from there. Historic adjustments are flagged separately and reviewed but not always re-booked. Most clients are forward-looking by design — going back five years rarely pays for itself.

Should I switch from QuickBooks Desktop to Online?+

Yes for most businesses. Online is updated continuously, integrates with more modern tools, and allows your bookkeeper to access the books without VPNs or remote-desktop workarounds. Migration costs are modest; benefits accumulate when the day comes that you want real-time dashboards or to grant your CPA read-only access.

Want help applying this to your situation?

Book a free 15-minute consult — bring this guide.

READY TO ACT?

Turn this concept into a plan for your numbers

The general guidance above is a starting point. A 30-minute conversation with one of our senior advisors usually uncovers at least one specific move you can make this month.