House Flip Profit & Tax Calculator (2026)

Enter your deal details to see your net profit before and after taxes under all three scenarios: dealer status (ordinary income + self-employment tax), short-term investor (held under one year), and long-term investor (held 12+ months). The difference in federal tax on the same $120,000 flip can exceed $40,000.

What this calculator shows

Net profit before tax

Profit equals sale price minus: purchase price, renovation costs, holding costs during the project (property taxes, insurance, utilities × months held), financing costs (points and interest paid on the hard money or construction loan), and selling costs (agent commissions, title, transfer taxes). Every legitimate expense reduces your taxable gain — and is often larger than investors realize.

The three tax scenarios side by side

Dealer status: ordinary income + self-employment tax

Under IRC § 1221(a)(1), a property held primarily for sale to customers in the ordinary course of business is not a capital asset — it's inventory.¹ Dealer profit is taxed as ordinary income at your marginal rate, plus self-employment tax (15.3% on 92.35% of net earnings — 12.4% Social Security capped at the $184,500 wage base in 2026,² plus 2.9% Medicare uncapped). At a 32% federal bracket, dealer status adds 15.3% SE tax on top — a combined federal rate above 47% before state taxes.

Dealer status also forecloses 1031 exchanges, long-term capital gains rates, and the stepped-up basis at death. The IRS applies a six-factor test — no single rule decides it. See the full dealer vs. investor guide for the exact factors courts use.

Short-term investor: ordinary income, no self-employment tax

If you're an investor (not a dealer) and hold the property less than 12 months, the gain is short-term capital gain — taxed at ordinary income rates, same as dealer. The critical difference: no self-employment tax. The SE tax difference alone is $13,000–$17,000 on a $120,000 flip profit. Access to 1031 exchanges and step-up at death is also preserved.

Long-term investor: capital gains rates + NIIT

Hold at least 12 months as an investor and the gain qualifies for preferential long-term capital gains rates: 0%, 15%, or 20% based on total taxable income, plus the 3.8% Net Investment Income Tax if MAGI exceeds $200K single / $250K MFJ (IRC § 1411³). For most investors above the NIIT threshold, the combined federal rate is 18.8% — versus 37%+ SE tax + ordinary income for dealer status. The 12-month line is a bright line: day 365 is short-term, day 366 is long-term.

The S-corp strategy for serial flippers

If dealer status is unavoidable — you flip four or more properties per year — an S-corporation structure can reduce the SE tax component. By paying yourself a reasonable W-2 salary and taking additional profit as an S-corp distribution, only the W-2 salary portion is subject to FICA (SS + Medicare). At $250,000 in annual flip profits, an S-corp can save $15,000–$25,000 per year in SE tax, depending on what constitutes "reasonable compensation." This requires a qualified CPA and has ongoing payroll administration costs. See the guide for worked examples.

Deductible costs that reduce taxable profit

Commonly missed deductions that belong in your cost basis or as current-year deductions:

• Property taxes during the renovation and listing period — fully deductible
• Insurance (builder's risk, hazard) during the hold period
• Utilities (electricity, gas, water) while you own the property
• Loan origination fees and points — for a flip (not a primary residence), points are deductible as interest expense in the year paid
• Mortgage interest on the hard money or construction loan
• Staging and marketing costs for the listing
• Permits and inspections — added to renovation basis
• Travel to the property — if you materially managed renovation, mileage deduction applies

Annualized ROI

After-tax profit divided by total capital invested (purchase + renovation + holding costs + financing), annualized by holding period. A flip that returns $30,000 after-tax in 6 months produces a 25% annualized ROI if $240,000 was invested; the same return in 14 months produces about 10.7%. The LTCG holding requirement can add value even if the annualized rate drops — if the after-tax gain is large enough.

When a financial advisor changes your outcome

The dealer vs. investor line, S-corp election timing, the 12-month holding decision, and exit coordination (1031, installment sale, or outright) are not standard financial planning — they're REI-specific tax decisions. At $100,000+ in annual flip profits, these decisions are worth $10,000–$40,000 in federal tax per year.

See how to choose a financial advisor for real estate investors — what credentials to look for, what diagnostic questions to ask, and red flags that signal a generalist who won't help.

1. IRC § 1221(a)(1) — definition of capital asset excluding dealer property (Cornell Law / LII)
2. SSA.gov — Contribution and Benefit Base: 2026 Social Security wage base $184,500
3. IRS Topic 559 — Net Investment Income Tax; IRC § 1411 thresholds $200K/$250K MFJ (not indexed for inflation)
4. Tax Foundation — 2026 Federal Tax Brackets: ordinary income rates and LTCG thresholds per IRS Rev. Proc. 2025-32

Tax values verified for 2026: ordinary income brackets and LTCG thresholds per IRS Rev. Proc. 2025-32 (Tax Foundation); SS wage base $184,500 per SSA.gov announcement October 2025; NIIT threshold $200K/$250K per IRC §1411 (not indexed). This calculator produces estimates — consult a qualified tax professional for your specific situation. Values verified June 2026.