Form 8960: Net Investment Income Tax, Thresholds, and Instructions

The word “qualified” in qualified dividends does not create a NIIT exemption. Long-term capital gains can also face NIIT even when they receive preferential regular-tax treatment.

A taxable home-sale gain above the available Section 121 exclusion can be included. A second home does not automatically receive that exclusion. Only recognized gains enter the relevant calculation, not the gross selling price.

Rental income generally is included. Being a landlord, managing the property or qualifying as a real estate professional does not by itself establish an exclusion.

For the usual business exclusion, the activity must be a Section 162 trade or business, nonpassive to the taxpayer, and not a business trading financial instruments or commodities. Real estate professionals must examine material participation and the trade-or-business requirement. The safe harbor generally requires more than 500 participation hours in the rental activity during the current year, or in any five of the preceding ten tax years. An applicable grouping election can affect which rentals count as one activity. Failing the safe harbor does not automatically bar an otherwise established exclusion.

Self-rental and properly grouped activities have additional rules. A taxable rental-property sale can also generate NII, including relevant recognized gain, unless an applicable exclusion is established.

Income taken into account for Medicare self-employment tax is specifically excluded from NIIT. Income merely exempted from self-employment tax is not automatically exempt from NIIT. Review Schedule C, Schedule E and Schedule SE together.

Likewise, active ownership does not automatically exclude gain from selling partnership interests or S corporation stock. A special look-through adjustment may be required, with supporting entity information and a statement. See the Form 8960 instructions.

Line 5a generally starts with Form 1040/1040-SR line 7a plus Schedule 1 line 4. Use the IRS net-gains worksheet for exclusions and NIIT capital-loss adjustments. Regular-tax and NIIT loss carryforwards can differ.

Line 4a initially captures potentially relevant Schedule C, E and F income. Line 4b removes amounts excluded from NII. Excluded positive income is a negative adjustment; an excluded loss is added back as a positive adjustment.

For example, assume line 4a includes $70,000 of excluded nonpassive business profit and $18,000 of passive rental income. With no other adjustments, enter negative $70,000 on line 4b, leaving $18,000 on line 4c. Confirm the exclusion before entering the adjustment.

Line 5b similarly adjusts excluded gains or losses already included on line 5a. Do not remove an excluded amount twice.

A deduction generally must be allowable for regular income tax and properly allocable to NII. Expenses already included in net Schedule E or business income cannot be deducted again here. Special rules apply to allowable estate and trust administration expenses.

Line 9b is not a place to copy all state tax paid. Identify the allowed tax deduction attributable to NII using a reasonable allocation. The instructions also address qualifying property taxes, and applicable limits can affect the amount. Sales taxes are not deductible in calculating NII.

Example: assume $12,000 of state income tax is allowable as an itemized deduction and a documented reasonable allocation assigns 25% to NII. The line 9b amount is $3,000, not $12,000. The allocation is illustrative, not a universal percentage.

For 2025 individuals, ordinary investment-management and custodial fees are generally disallowed miscellaneous itemized deductions, so they cannot simply be entered on line 9c. The legacy Sections 67/68 limitation worksheet in the instructions is marked not for use in 2025.

Line 12 subtracts line 11 from line 8, with a floor of zero. Individuals enter MAGI on line 13 and the filing-status threshold on line 14. Line 15 calculates excess MAGI. Line 16 takes the smaller of lines 12 and 15. Multiply by 3.8% on line 17.

Estates and trusts use lines 18 through 21 instead. The official form and instructions control the calculation.

For 2025, a domestic estate or trust generally computes 3.8% of the smaller of undistributed NII or AGI above $15,650.

Suppose a nongrantor trust has $25,000 AGI and $12,000 undistributed NII after permitted adjustments. The excess AGI is $9,350. NIIT is $355.30 before return rounding: $9,350 × 3.8%.

Lines 18a through 18c address NII and permitted reductions for beneficiary distributions and charitable deductions. A distribution can shift reportable investment income to a beneficiary; it does not necessarily eliminate NIIT overall.

Grantor trusts generally do not pay NIIT separately, but their tax owners may. Charitable trusts, foreign trusts, ESBTs and qualified funeral trusts have special rules. Do not apply individual thresholds to an ordinary nongrantor trust.

Potential review areas include permitted loss netting, properly allocable deductions, qualifying retirement contributions that reduce AGI, and the timing of taxable gains or conversions. Each has separate conditions and broader consequences.

Tax-loss harvesting is subject to wash-sale and other loss rules. An unused loss is not automatically fully deductible against any investment income. A charitable deduction or standard deduction does not automatically reduce NIIT MAGI or NII. Do not misclassify an activity as nonpassive solely to avoid NIIT.

This guide provides general educational information about the 2025 Form 8960, not personalized tax, legal or investment advice. NIIT depends on income character, residency, elections and the complete return. Use current IRS materials for the correct tax year and consult a qualified tax professional.