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The Underwriting & Mathematics of House Flipping Profits

House flipping is a high-risk, high-return real estate strategy. To succeed, investors must underwrite deals with conservative assumptions about rehab budgets, holding periods, and selling closing fees. This guide details how to model flipping profits and calculate return metrics.

Flipping Profit and ROI Equations

Let $P_{\\text{purchase}}$ be the property purchase price. Let $C_{\\text{closing-buy}}$ be the buying closing costs, and $C_{\\text{rehab}}$ be the renovation budget. If $H$ is the monthly holding cost and $t$ is the holding period in months, the total holding cost $C_{\\text{holding}}$ is:

$$C_{\\text{holding}} = H \\cdot t$$

The Total Capital Invested ($C_{\\text{total}}$) is the sum of all upfront outlays:

$$C_{\\text{total}} = P_{\\text{purchase}} + C_{\\text{rehab}} + C_{\\text{closing-buy}} + C_{\\text{holding}}$$

Let $P_{\\text{sale}}$ be the final sale price of the property, and $C_{\\text{closing-sell}}$ be the selling costs (commissions, transfer taxes, escrows). The Net Profit ($P_{\\text{net}}$) is:

$$P_{\\text{net}} = P_{\\text{sale}} - C_{\\text{total}} - C_{\\text{closing-sell}}$$

The Return on Investment ($ROI$) and Annualized Return ($ROI_{\\text{ann}}$) are computed as:

$$ROI = \\frac{P_{\\text{net}}}{C_{\\text{total}}} \\cdot 100$$

$$ROI_{\\text{ann}} = ROI \\cdot \\frac{12}{t}$$

Worked Example

An investor purchases a home for $200,000. Buying closing costs are $5,000, and the rehab budget is $40,000. The property takes 6 months to renovate and sell, with monthly holding costs of $1,200 (utilities, taxes, and interest). The home sells for $310,000, and selling costs (6% commissions + closing fees) are $18,600:

1. **Total Holding Cost**: $1,200 * 6 months = $7,200.
2. **Total Capital Invested**: $200,000 + $40,000 + $5,000 + $7,200 = $252,200.
3. **Net Profit**: $310,000 - $252,200 - $18,600 = $39,200.
4. **Return on Investment (ROI)**: ($39,200 / $252,200) * 100 = 15.54%.
5. **Annualized ROI**: 15.54% * (12 / 6) = 31.08%.

Managing the 'Double Closing Cost' Trap

Flippers pay closing costs twice: once when buying and once when selling. These friction costs (averaging 10% of the property value combined) eat into profits. Successful flippers mitigate this by negotiating buyer closing cost credits from sellers, or using licensed agent partnerships to list their finished properties for a discounted commission rate.

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