How to Calculate House Flip Profit After All Costs
Profit on a house flip is the sale price minus the purchase price minus every cost of buying, renovating, holding, financing and selling, then minus tax. Write it as: Profit = Sale price - (Purchase price + Buying costs + Renovation + Contingency + Holding costs + Finance costs + Selling costs) - Tax. Most flips that "made £80,000" on paper made far less once stamp duty, interest, fees and tax were counted.
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This is general information, not tax or financial advice. Tax treatment of flipping depends on your country and structure; check with an accountant before you buy.
The full cost list
- Purchase price.
- Buying costs: stamp duty or transfer tax, legal fees, survey, searches, broker fees.
- Renovation: builders, materials, kitchen, bathroom, certificates, planning or building control.
- Contingency: at least 10% of the renovation budget. Old houses hide problems.
- Holding costs: council or property tax, utilities, insurance (unoccupied cover costs more), security.
- Finance costs: interest, arrangement fees, exit fees, valuation fees.
- Selling costs: agent fee, legal fees, staging, any early repayment charge.
- Tax: flipping profit is often treated as trading income, not a capital gain.
Worked example (UK, example numbers)
You buy a house to renovate and sell within six months.
Buying
- Purchase price: £200,000
- Stamp duty at higher rates (you already own a home): standard rate on £200,000 is £1,500, plus 5% surcharge on £200,000 = £10,000. Total £11,500
- Legal fees: £1,500
- Survey: £600
Renovation
- Works: £35,000
- Contingency (10%): £3,500
Holding and finance (6 months)
- Bridging loan £150,000 at an example 0.85% a month: 0.0085 x 150,000 x 6 = £7,650
- Arrangement fee 2% of the loan: £3,000
- Council tax, utilities, insurance: £1,800
Selling
- Sale price: £280,000
- Agent fee 1.2% + VAT: 280,000 x 1.44% = £4,032
- Legal fees: £1,200
Totals
- All costs except purchase: 11,500 + 1,500 + 600 + 35,000 + 3,500 + 7,650 + 3,000 + 1,800 + 4,032 + 1,200 = £69,782
- All-in cost: 200,000 + 69,782 = £269,782
- Profit before tax: 280,000 - 269,782 = £10,218
The "£80,000 uplift" (280,000 minus 200,000) became about £10,000 before tax. Your cash in the deal was roughly the £50,000 deposit plus most of the costs, around £120,000, so that is about an 8.5% return for six months of risk and work, before tax. One month of delay or a £10,000 overspend wipes most of it out.
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A quick screening rule
Many US flippers use the "70% rule": maximum purchase price = 70% of the after-repair value (ARV) minus renovation costs. It is a rule of thumb, not a law, but it builds in room for costs and profit.
For the deal above: 0.70 x 280,000 - 35,000 = £161,000. The £200,000 purchase was about £39,000 too high on this rule, which matches the thin profit.
Tax, briefly
- UK: buying to sell for profit is often trading, taxed as income for individuals or corporation tax in a company, not capital gains.
- US: a sale held one year or less is taxed at ordinary income rates, and frequent flippers may be treated as dealers.
- India and Dubai: rules differ again; take local advice.
Common mistakes
- Valuing the finished house on the best sale in the street instead of typical recent sales.
- No contingency.
- Assuming a three-month timeline. Planning, trades and the sale process often double it.
- Forgetting interest keeps running while you wait for a buyer.
- Ignoring stamp duty surcharges for second properties or companies.
- Counting your own labour as free.
Red flags
- Profit only works if the sale price is at the top of the range.
- Profit under about 15% of the sale price with a big refurb.
- Structural work, damp or roof issues found after the offer and not re-priced.
The full strategies section, with ten approaches compared and a worked deal, is in Real Estate: Everything You Need to Know.
FAQ
What is a good profit margin on a flip?
Many investors aim for a profit of at least 15% to 20% of the sale price, or a clear figure per month of their time. Set your own minimum before you look at deals.
Should I include my own time?
Yes. If you could earn elsewhere in that time, count it as a cost so you compare fairly.
Is profit the same as return on cash?
No. Divide profit by the cash you put in, and adjust for how long the cash was tied up.
More playbooks on other topics: https://www.asendify.co/books/
Everything You Need to Know. £1450.00 one-time, instant download.