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Home Sale Capital Gains Estimator

Estimate amount realized, adjusted basis, potential Section 121 exclusion, potentially taxable gain, federal capital-gains bands, NIIT exposure, and after-tax sale proceeds. No account or email required.

Educational planning only - not tax preparation or tax advice. Every monetary output is labeled as an estimate.

1. Property and sale
2. Purchase and adjusted basis

Not every purchase closing cost increases basis. Mortgage interest, loan fees, taxes, insurance, escrow, moving expenses, and routine repairs are not included automatically.

Capital-improvement worksheet - potential basis additions entered by you (Estimate $0)

Capital improvements generally add value, prolong useful life, or adapt the property to a new use. Routine repairs usually do not increase basis unless part of a larger qualifying improvement.

Advanced basis reductions

Casualty adjustments, reimbursements, credits, easements, and deferred gain can affect basis. Use professional review if any category is uncertain.

3. Selling expenses and cash proceeds

Paying off the mortgage reduces the cash you receive at closing, but it does not reduce the gain used for this estimate. Automatic costs use the existing state-specific net-proceeds engine; NYC assumptions are never applied to Connecticut.

4. Section 121 eligibility
Partial-exclusion assessment

Safe-harbor reasons receive a preliminary shortest-period calculation. “Other” and uncertain facts require professional review and do not receive a confirmed exclusion.

5. Rental, business, and complex history
Complex ownership or transaction flags
6. Income and federal estimate (optional)

Salary and household income are not the same as taxable income. If taxable income is unknown, the estimator shows potentially taxable gain and withholds a precise federal total.

Residency

No email or account is required. Anonymous calculations stay in this browser and do not create an Inquiry.

Rules used by this estimator

  • Section 121 central limits: $250,000 individual and $500,000 qualifying joint return.
  • Ownership, residence, and look-back tests are assessed separately.
  • Depreciation-related gain is separated from potentially excludable gain.
  • Federal tax year supported: 2026.
  • 2026 LTCG bands: verified IRS Revenue Procedure table; calculations stack across 0%, 15%, and 20% bands.
  • NIIT: verified IRS 3.8% lesser-of method and filing-status thresholds.
  • State output: educational NY, NYC, CT, and multistate notes; no precise state tax.
  • Rules version 1.0.0; last verified July 15, 2026; next review January 15, 2027.

How the estimate is organized

Sale price versus amount realized

Amount realized starts with gross sale price and subtracts supported qualifying selling expenses.

Mortgage payoff versus basis

Mortgage payoff changes cash proceeds, not gain or adjusted basis.

Original and adjusted basis

Purchase basis, supported acquisition costs, potential improvements, reductions, and depreciation are shown separately.

Capital improvements

The worksheet organizes entries but does not determine that each item qualifies. Keep supporting records.

Section 121

Ownership, residence, look-back, spouse-specific, and partial-exclusion facts are assessed cautiously.

Rental and depreciation

Depreciation is separated. Complex nonqualified-use periods withhold a final exclusion and trigger review.

Federal bands and NIIT

A precise federal estimate appears only with adequate income information and current verified tables.

State and residency

Property state and resident state are separate. Multistate cases receive a warning rather than double full-state tax.

Seller records checklist

  • Purchase closing statement
  • Purchase contract
  • Title and ownership records
  • Improvement invoices and contractor receipts
  • Permits
  • Insurance reimbursements
  • Depreciation schedules
  • Prior tax returns
  • Rental records
  • Sale contract
  • Seller closing statement
  • Brokerage invoice
  • Attorney invoice
  • Transfer-tax records
  • Form 1099-S
  • Prior home-sale exclusion records

This is an organizational checklist, not a representation that every record changes basis.

Related seller planning

Home-sale capital-gains FAQs

Do I pay capital gains tax when I sell my home in New York?

Potentially. Federal exclusion, basis, use, income, residency, and New York-source rules all matter. The estimator calculates supported federal estimates and provides a New York pathway, not a final state liability. New York official guidance.

Do I pay capital gains tax when I sell my home in Connecticut?

Potentially. Connecticut generally begins with federal adjusted gross income subject to state modifications, and Connecticut real property can create Connecticut-source income. This tool does not calculate a precise Connecticut tax. Connecticut official guidance.

What is the Section 121 home-sale exclusion?

It may allow an eligible seller to exclude up to $250,000, or up to $500,000 for a qualifying joint return, of gain from a main-home sale. Depreciation and nonqualified-use rules can limit the result. IRS Publication 523.

Who qualifies for the $250,000 exclusion?

An individual generally must meet separate ownership, residence, and prior-exclusion look-back tests. Partial-exclusion and special rules may apply.

Who qualifies for the $500,000 exclusion?

For the standard joint limit, at least one spouse generally meets ownership while both meet residence and look-back requirements.

Do both spouses need to own the home?

Not for the standard full joint test: at least one spouse generally must meet ownership, but both spouses have separate residence and look-back requirements.

Do both spouses need to have lived in the home?

For the standard full joint exclusion, both spouses generally must meet the residence test.

What is the two-out-of-five-year rule?

Ownership and residence are generally tested for at least 24 months during the five-year period ending on the sale date. The periods do not have to be continuous or identical. IRS Publication 523.

Can I use the exclusion more than once?

Yes, but generally not if you claimed a Section 121 exclusion for another home during the two years before the current sale.

What happens if I sold another home within two years?

Selling another home alone is not the test. The estimator asks whether a Section 121 exclusion was claimed within the look-back period.

Can I qualify for a partial exclusion?

Possibly when the primary reason for sale is a qualifying work, health, or unforeseeable event. The estimator calculates only supported preliminary cases. IRS Publication 523.

Does a job move qualify for a partial exclusion?

It may. IRS safe-harbor details include distance and timing requirements; this estimator provides a preliminary result and links to Publication 523. IRS Publication 523.

Do capital improvements reduce my gain?

Potential qualifying improvements can increase adjusted basis and reduce gain. Every entered item remains an estimate requiring records and review.

Which home improvements count toward basis?

Improvements generally add value, prolong useful life, or adapt the home to a new use. The worksheet does not determine that an item qualifies.

Do repairs count as capital improvements?

Routine repairs and maintenance usually do not increase basis unless completed as part of a larger qualifying improvement.

Do selling costs reduce the gain?

Qualifying selling expenses reduce amount realized. Cash closing costs and tax selling expenses can differ, so the estimator keeps their role visible.

Does paying off my mortgage reduce capital gain?

No. Mortgage payoff reduces estimated cash proceeds, not amount realized or adjusted basis.

What happens if I rented the property?

Rental timing can affect depreciation, nonqualified use, reporting, and exclusion. Complex timelines trigger professional review. IRS Publication 523.

Is depreciation covered by the Section 121 exclusion?

Depreciation allowed or allowable after the applicable cutoff is separated and is not sheltered by the modeled Section 121 exclusion. IRS Publication 523.

What is depreciation allowed or allowable?

It can include depreciation you claimed or could have claimed. Determining the amount often requires prior returns and depreciation schedules.

What is nonqualified use?

Certain periods after 2008 when the property was not used as a principal residence can make part of gain ineligible for exclusion, subject to important exceptions. IRS Publication 523.

What if I inherited the property?

Inherited basis and ownership facts are outside the simple pathway. The calculator shows a professional-review state.

What if I received the property as a gift?

Gift basis can depend on donor basis and fair-market-value rules. The calculator does not determine the correct basis and requires review.

What if I acquired it through a 1031 exchange?

Section 1031 history can change basis and eligibility, including a five-year rule in some cases. The estimator flags professional review.

How are federal capital-gains rates calculated?

Verified annual 0%, 15%, and 20% bands are stacked above estimated ordinary taxable income, other long-term gains, and qualified dividends.

Why does the calculator ask for taxable income?

The amount of home-sale gain falling into each federal capital-gain band depends on taxable income and other preferential-rate income.

What is the Net Investment Income Tax?

NIIT is a separate 3.8% federal tax using the lesser of applicable net investment income or MAGI above a filing-status threshold. Excluded Section 121 gain is omitted.

Does New York tax capital gains?

New York generally starts with federal adjusted gross income subject to state modifications. Remaining federally taxable gain may affect the New York return. New York official guidance.

Does New York City tax capital gains?

NYC resident income tax may apply through the New York return when the seller is an NYC resident. Property location alone does not establish residency. New York official guidance.

Does Connecticut tax capital gains?

Connecticut generally starts with federal adjusted gross income subject to state modifications. Connecticut property can create state-source income for nonresidents. Connecticut official guidance.

Can two states tax the same home sale?

More than one state may have a claim, but sourcing and resident-credit rules can matter. The tool does not add two full state taxes.

Can I deduct a loss on my primary home?

A loss on personal-use property is generally not deductible. Mixed-use and investment facts require professional review.

Is this calculator an official tax calculation?

No. It is an educational planning estimate and does not prepare a return or determine final federal, state, or local liability.

Can I use the calculator without providing an email?

Yes. Every calculation, result, methodology detail, print action, and copy action is available anonymously.

Can I email the results to myself?

Yes. After viewing the complete result, you may optionally request a PDF. That request creates an Inquiry containing contact details and a limited summary.

Should I consult a CPA?

Professional review is especially important for rental, depreciation, inherited, gifted, exchanged, multistate, jointly owned, or otherwise complex property histories.

For educational planning only, based on information entered and verified rule tables. This is not tax-return preparation, tax, legal, accounting, investment, valuation, appraisal, or broker-price-opinion advice. It does not determine final liability or guarantee Section 121 eligibility. Basis, improvements, selling expenses, depreciation allowed or allowable, use history, residency, and return-level facts require verification by a qualified tax professional.

What this covers

What it answers
Organize basis, amount realized, Section 121 screening, and user-entered tax assumptions.
Who it is for
Owners getting ready to sell.
What it does not cover
Legal, tax, and accounting advice. The result is an estimate for illustration.

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