Common Accounting Basics People Get Wrong
Many business owners think they understand their numbers — until a small accounting misunderstanding quietly starts draining profits, cash flow, or tax savings.
At Accounting Actuals, we see the same issues repeatedly when businesses come to us for help with audit accounting, cost accounting and fractional accounting services in areas such as San Diego, Del Mar, and Sorrento Valley.
Today, we’re breaking down three of the most commonly misunderstood accounting concepts that can cost your business real money if you get them wrong:
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Markup vs. Gross Profit Margin
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Cash Flow vs. Profit
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The Truth About Write-Offs
Once you understand these, you’ll see your business numbers — and your decisions — very differently.
Contents:
1. Markup vs. Gross Profit Margin — They Are Not the Same
Markup and gross profit margin are often used interchangeably — but they measure two completely different things. Confusing them is one of the most common pricing mistakes businesses make.
Markup
Markup is calculated based on cost.
Example:
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Cost of product: $100
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Markup: 50%
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Sale price: $150
Gross Profit Margin
Gross profit margin is calculated based on revenue, not cost.
Example:
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Sale price: $150
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Cost of goods sold (COGS): $100
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Gross profit: $50
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Gross profit margin: 33%
Why This Matters
Because markup is based on cost and margin is based on revenue, the percentages will never match. If you price your products or services using markup alone, you may think you’re earning a healthy margin — when in reality, you’re underpricing and limiting profitability.
This is a major issue for businesses that rely heavily on pricing accuracy, including:
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Restaurants
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Construction companies
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Manufacturers and service providers
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Biotech Companies
A qualified fractional accounting firm ensures your pricing strategy reflects true profitability through accurate cost accounting and margin analysis — not assumptions.
2. Cash Flow vs. Profit — Also Not the Same
Another costly misconception: profit does not equal cash flow.
This misunderstanding is one of the biggest reasons profitable businesses still struggle to pay bills, make payroll, or cover taxes.
Cash Flow
Cash flow tracks the actual movement of money into and out of your business.
Profit
Profit appears on your Profit & Loss statement — but it does not reflect what’s currently in your bank account.
Real-World Example
Your business purchases $20,000 of raw materials.
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The inventory is recorded on the Balance Sheet
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It does not hit the Profit & Loss until sold
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Your cash decreases by $20,000 immediately
Your profit stays the same — but your cash is gone.
At the same time, profit can be reduced by non-cash expenses like:
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Depreciation
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Amortization
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Accrued expenses or revenue
This is why businesses can appear profitable on paper but still face cash shortages.​
3. A Write-Off Is Not Free Money
“Just write it off — it’s free!”
This is one of the most dangerous tax myths in business.
A write-off simply reduces taxable income. It does not make an expense free.
Example
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Business expense: $1,000
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Tax rate: 20%
What actually happens:
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You spend $1,000 in real cash
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You save $200 in taxes
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Net cost to you: $800
A write-off is a tax discount, not a refund or free purchase.
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Proper planning with an experienced general business accountant ensures tax strategies are intentional — not reactive.
Why This Matters for Local Businesses
For businesses in San Diego, Del Mar, and Sorrento Valley, these accounting misunderstandings can quietly erode profits year after year.
Whether you operate a restaurant, construction company, biotech firm, or professional service business, understanding your numbers — and having the right accounting support — is critical.
Working with the right fractional accounting firm ensures:
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Accurate pricing and margin analysis
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Clean, reliable financial statements
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Strong cash-flow management
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Better tax planning and compliance
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Confident, data-driven decisions
Final Thoughts
Accounting doesn’t have to be complicated — but it does have to be correct.
Misunderstanding markup, cash flow, or write-offs can cost your business real money. Getting them right creates clarity, confidence, and long-term profitability.
At Accounting Actuals, we help businesses across San Diego, Del Mar, and Sorrento Valley gain financial clarity through expert audit accounting, cost accounting, fractional accounting, and financial statement services — tailored to your industry and growth stage.