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Calculator: Estimate Your Tax Bill from a Private Buyout or Take‑Private Offer

UUnknown

2026-03-09

11 min read

Estimate capital gains, federal/state taxes, and after‑tax cash from an all‑cash buyout — with a practical calculator and step‑by‑step planning checklist.

If an all-cash take‑private offer landed in your lap, what will you actually keep after taxes?

Many shareholders are thrilled by a juicy premium — then paralyzed by uncertainty: how much will the IRS and your state take? Will the sale be short‑term or long‑term gain? Is there a Net Investment Income Tax (NIIT) exposure? This guide gives a practical, hands‑on calculator and a step‑by‑step walkthrough so you can estimate capital gains, federal and state taxes, and your after‑tax proceeds from an all‑cash buyout in 2026.

Why this matters now (2026 trends)

Take‑private and strategic buyouts remained active through late 2025 as private equity and strategic buyers deployed dry powder — that often produces generous all‑cash offers and compressed timelines for shareholder decisions.
Tax authorities are prioritizing transaction reporting and high‑value sale audits. Advisors reported increased IRS document requests in 2025, especially for high‑premium take‑privates and complex basis adjustments.
State tax differences and nonresident withholding rules continue to create material surprises for shareholders who move or hold shares across states — so a federal‑only estimate is often insufficient.

How to use this guide

Start with the quick calculator below, then read the walkthrough and examples to validate assumptions and spot planning opportunities. Use the calculator for ballpark estimates and always confirm with a qualified tax advisor before making elections or planning tax payments.

Interactive calculator: Estimate your proceeds

Enter the numbers you know. The calculator assumes an all‑cash sale and computes gross proceeds, capital gain, federal tax at your entered capital gains rate, optional NIIT, state tax, and final after‑tax proceeds. If your gain is short‑term, set the federal rate to your marginal ordinary rate.

Walkthrough: Step‑by‑step manual calculation

Confirm the sale details: sales price per share, number of shares you own that will be cashed out, and any transaction fees or broker commissions. For public deals there can also be tender fees, transfer agent fees, or break fees.
Establish your cost basis: basis usually equals what you paid for the shares plus commissions and certain reinvested dividends. If shares were received via grants, exercise, or acquisition, the basis calculation may be more complex (e.g., stock options, RSUs). Get brokerage statements and grant notices.
Calculate gross proceeds and realized gain:
- Gross proceeds = sale price per share × number of shares
- Realized gain = gross proceeds − adjusted cost basis − selling expenses
Determine holding period: if you held the shares >1 year before the sale date, the gain is usually long‑term and taxed at capital gains rates; if not, it’s short‑term and taxed as ordinary income.
Estimate federal tax on the gain: enter the long‑term capital gains rate that matches your taxable income (commonly 0%, 15%, or 20%), or use your ordinary federal marginal rate for short‑term gain. Don’t forget the 3.8% NIIT if your modified adjusted gross income is above the NIIT thresholds ($200k single / $250k married filing jointly / $125k MFS — these thresholds remain the usual benchmarks; confirm for 2026).
Estimate state tax: most states tax capital gains as ordinary income. Some states have no income tax; others have top marginal rates over 10%. Apply the state effective rate to the gain and account for possible nonresident withholding rules if you’re not a resident of the state where the company is incorporated or transacted.
Include any special taxes or withholdings: foreign sellers may face withholding; certain states require estimated payments or automatic withholding on sale of media, oil and gas interests, or stock of in‑state companies for nonresident shareholders.
Calculate after‑tax proceeds: gross proceeds minus total tax and selling expenses equals the cash you’ll receive at closing (or net of withholding if taxes are remitted at closing).

Worked examples

Example A — Long‑term gain, typical U.S. shareholder

Facts: You own 1,000 shares, sale price $2.22 per share (all‑cash offer), basis $0.75 per share, selling expenses $0.

Gross proceeds = $2,220
Total basis = $750
Realized gain = $1,470
Assume long‑term capital gains federal rate = 15% => federal tax = $220.50
Assume no NIIT and state tax = 0% => state tax = $0
After‑tax proceeds = $2,220 − $220.50 = $1,999.50

This simple scenario shows a material difference between gross and net cash. If a state tax applied (for example, 5%), that would shave another $73.50 off your after‑tax proceeds.

Example B — Short‑term gain for a high bracket taxpayer

Facts same as above but you held the shares 9 months and your marginal federal ordinary rate is 37% and you’re subject to NIIT.

Federal tax = $1,470 × 37% = $543.90
NIIT = $1,470 × 3.8% = $55.86
Total tax = $599.76; after‑tax proceeds = $2,220 − $599.76 = $1,620.24

Short‑term treatment dramatically reduces the net cash retained. Confirm your holding period carefully before accepting any deal.

Advanced considerations and planning opportunities (practical, actionable)

Check for basis step‑ups or special basis rules: corporate actions, spin‑offs, and prior reorganizations can affect basis. Gather historical statements; reconstructing basis often yields meaningful tax savings.
Timing income and deductions: if you expect a significant LTCG rate jump or additional surtaxes, you might accelerate or defer other income to remain in a lower bracket. Use estimated tax payments to avoid penalties.
Installment sale? Not in most all‑cash take‑privates — an all‑cash closing typically gives immediate recognition of full gain. If the buyer offers earnouts or contingent cash, explore installment sale treatment and the tax timing benefits (but get expert help).
Charitable giving and donor‑advised funds: if you plan philanthropic gifts, consider donating appreciated shares before a tender (when accepted by the charity) or use a donor‑advised fund to bunch giving and offset gains.
State residency planning: if you recently moved states or will move right after the sale, discuss resident vs nonresident sourcing rules — states may tax gains sourced to the state where the company has operations or where you accrued the income.
Foreign seller issues: Canadian or other non‑US residents may face cross‑border withholding and treaty issues — for example, Canadian purses in cross‑border deals often require review of Section 1446/1445 type withholding rules and local Canadian tax consequences. The Titanium example (Canada) shows premiums can also influence cross‑border tax outcomes.
Lockup/escrow and indemnity holds: if part of proceeds are retained in escrow for indemnity, determine the timing of recognition and whether that affects your cash flow vs taxable recognition.

Common pitfalls that cost shareholders

Assuming gross sale price equals net cash — forgetting state tax, NIIT, and fees.
Misreading holding period — short‑term vs long‑term changes your federal rate dramatically.
Failure to document basis — lost records can increase taxable gain and your tax bill significantly.
Ignoring withholding — some states or buyers will withhold at closing and you may need refunds later.
Delaying consultation with a tax advisor — in fast‑moving take‑private deals you may have little time to plan.

Case note: the 2024 Titanium Transportation all‑cash take‑private (CAD$2.22 per share offer, 41% premium) illustrated how a generous purchase price can still deliver modest after‑tax proceeds if basis is unknown or holding period creates short‑term tax exposure. Always run the numbers.

What to bring to your tax advisor

Brokerage statements showing acquisition dates and purchase prices for every lot sold.
Grant documents for RSUs, options and notices of exercise that affect basis.
Transaction documents: tender offer, merger agreement, press release with effective date and form of consideration.
Residency history for the tax year (state and country), especially if moved recently.
Any escrow or deferred/contingent payment terms.

2026 regulatory notes and watch items

IRS and state tax authorities increased focus on major asset sales in late 2024–2025; expect continued requests for documentary support in 2026.
Some states continue to refine nonresident withholding guidance; if you are a nonresident, verify whether withholding will be applied at closing.
Federal capital gains law remained largely intact entering 2026, but indexing and enforcement focus can change taxpayer outcomes — keep an eye on legislative developments if you have very large gains.

Final actionable checklist before you accept an all‑cash buyout

Run the calculator with conservative assumptions for rates and NIIT.
Confirm your holding period for each lot — lot‑level sales may split long and short gains.
Collect and reconcile basis documentation — pursue brokerage cost‑basis reports before closing.
Ask the buyer and transfer agent about withholding and escrow timing in writing.
Schedule a call with a tax advisor to discuss estimated payments, state residency, and filing effects.

Next steps — get precise numbers and protect cash at closing

This DIY calculator and guide gives a clear first estimate, but personalized advice matters. If this transaction could move the needle on your taxes, get an advisor experienced in take‑private transactions, cross‑border withholding (if relevant), and basis reconstruction.

Ready to get precise estimates? Download your broker cost basis report, run the calculator above, then contact a tax advisor with the documents listed earlier. If you want help now, our team of senior tax attorneys and CPAs at taxservices.biz specializes in buyouts and going‑private deals — we provide fast, deal‑level tax estimates and planning to maximize your after‑tax proceeds.

Call to action: Use the calculator, gather your documents, and schedule a 30‑minute intake with our buyout tax team for a tailored estimate and filing strategy. Time is especially important in late‑stage offers — don’t wait until closing to discover surprises.

Disclaimer: This article provides general information and an interactive estimate. It does not constitute tax advice. Laws and rates vary by jurisdiction and change over time — consult your tax advisor for specific guidance.

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