Proving cost basis requires documenting the original purchase price, closing costs, and capital improvements using receipts, settlement statements (HUD-1/Closing Disclosure), and brokerage records. The IRS requires evidence of acquisition costs and adjustments; for real estate, this includes deeds and tax records. For securities, use 1099-B forms or transaction histories.
How Does the IRS Verify Cost Basis in Real Estate? In real estate transactions, the Internal Revenue Service (IRS) can verify the cost basis by looking at the closing statement of when the property was purchased, or any other legal documents associated with the property, such as tax statements.
The average cost basis method is generally available for all mutual funds (including open- or closed-end funds), exchange-traded funds (ETFs), and exchange-traded notes (ETNs). It is calculated by taking the total cost of the shares you own and dividing by the total number of the shares you hold.
The bottom line is that the IRS expects you to maintain records that identify the cost basis of your securities. If you don't have adequate records, you might have to rely on the cost basis that your brokerage firm reports—or you may be required to treat the cost basis as zero, which could mean owing more in taxes.
If the cost basis amount reported on Form 1099-B does not match your adjusted cost basis per your records, you will include adjustment code B on your tax return. Compensation income reported on Form W-2 is likely not included in your cost basis on Form 1099-B and will require an adjustment amount using code B.
On a $100,000 capital gain, you'll likely pay 15% for long-term gains, resulting in about $15,000 in federal tax (plus potential state tax), but it could be 0% or 20% depending on your total taxable income and filing status, while short-term gains are taxed as ordinary income (potentially 22-24%).
From the proceeds value (or deemed proceeds value), you should deduct the allowable costs, which include the original purchase price, enhancement expenditure (such as capital improvements) and incidental costs of acquisition and disposal (such as legal fees, surveyor fees, stamp duty land tax and estate agent fees).
When someone inherits investment assets, the IRS resets the asset's original cost basis to its value at the date of the inheritance. The heir then pays capital gains taxes on that basis. The result is a loophole in tax law that reduces or even eliminates capital gains tax on the sale of these inherited assets.
The Form 1099-B that you receive might only report the sale date and sales proceeds. If it does not report the date acquired or cost basis, you still need to enter that information when you report your Form 1099-B in the TaxAct program so that it will transfer to Schedule D and/or Form 8949.
Thanks to a law passed in 2008, taxpayers receive help keeping track of their tax basis. The law requires brokers to track the basis of specified securities (including stocks and mutual fund shares) purchased in 2011 and later years and report the basis amounts to investors (and the IRS) when the securities are sold.
A noncovered security is a designation given by the U.S. Securities and Exchange Commission (SEC) which means a brokerage is not required to report the cost basis of that security to the IRS. The adjusted cost basis of noncovered securities is only reported to the taxpayer, not to the IRS.
You should keep personal records of your investments, including purchase prices, dates, and any additional costs. These can be crucial for determining the cost basis, especially for older investments or those where the brokerage doesn't have the information.
The 20% rule for capital gains refers to the highest federal tax rate for long-term capital gains, applying to higher income brackets when you sell investments (stocks, real estate) held for over a year, with lower rates of 0% and 15% for lower incomes, and even higher rates for special assets like collectibles. This rate kicks in for single filers earning over approximately $492,300 (2024) or $533,401 (2025), and higher for joint filers, making holding assets over a year a key tax strategy.
The "6-year rule" for Capital Gains Tax (CGT) in Australia allows you to treat a former main residence as tax-exempt for up to six years after you move out, even if you rent it out, enabling you to avoid CGT on any growth during that period. You qualify by moving out, choosing to treat it as your main home for tax, and can reset the rule by moving back in. If you rent it out for longer than six years, only the portion of the gain after the six-year mark becomes taxable.
Will the IRS catch a missing 1099? The IRS knows about any income that gets reported on a 1099, even if you forgot to include it on your tax return. This is because a business that sends you a Form 1099 also reports the information to the IRS.
Investors can check brokerage statements, company investor relations pages, or IRS guidelines for reconstructing cost basis. If records are unavailable, the IRS allows the use of the first-in, first-out method or an average cost approach for mutual funds, ensuring a reasonable estimate based on available data.
On a $100,000 capital gain, you'll likely pay 15% for long-term gains, resulting in about $15,000 in federal tax (plus potential state tax), but it could be 0% or 20% depending on your total taxable income and filing status, while short-term gains are taxed as ordinary income (potentially 22-24%).
The basis of stocks or bonds you buy is generally the purchase price plus any costs of purchase, such as commissions and recording or transfer fees. If you get stocks or bonds other than by purchase, your basis is usually determined by the fair market value (FMV) or the previous owner's adjusted basis of the stock.
Capital gains tax rates
A capital gains rate of 0% applies if your taxable income is less than or equal to: $48,350 for single and married filing separately; $96,700 for married filing jointly and qualifying surviving spouse; and. $64,750 for head of household.
As a landlord or property investor, you can reduce the Capital Gains Tax you have to pay by deducting certain buying and selling costs from the sale price. This can include solicitor fees, Stamp Duty and estate agent fees. You can also make deductions for improvements, such as adding a new kitchen.
The "36-month rule" for capital gains tax (CGT) primarily refers to the UK's Principal Private Residence (PPR) Relief, where the final 36 months (or 9 months for most) of a property's ownership period are tax-exempt, even if not lived in, provided it was a main home at some point. In the US, the relevant rule for home sales is the "2-out-of-5-year rule" for the Section 121 exclusion, allowing up to $250k/$500k profit tax-free if owned and used as a main home for 2 of the 5 years before sale, with exceptions for unforeseen circumstances.