RSUs, ESPP Stock, Partnership K-1s, Multistate Income, an Inherited Pension, and a Second Home

By Alex Oware, CPA and Tax Attorney

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Quick Summary

• This guidance applies to married Colorado taxpayers whose return combines W-2 wages, employer stock compensation, brokerage sales, partnership income, an inherited pension, and two personally used homes.
• RSUs are generally included in wages when shares or cash are delivered after vesting; a later sale requires the correct adjusted basis so the compensation is not taxed twice.
• A qualifying section 423 ESPP usually creates no tax at purchase, but a later sale can produce both ordinary compensation and capital gain or loss.
• A partnership K-1 can create federal tax even without a cash distribution, and losses may be limited by basis, at-risk, and passive-activity rules.
• State K-1 schedules, nonresident withholding, composite returns, and pass-through entity tax credits determine whether additional state returns are required.
• For 2026, the married-filing-jointly standard deduction is $32,200; the federal SALT limit is generally $40,400, subject to a phase-down at higher income levels.
• The 2026 federal return and payment is due April 15, 2027. A timely extension will move the filing deadline to October 15, 2026, but will not extend the payment deadline.

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Who This Applies To

• A married couple filing a joint federal return and claiming dependent children.
• One or both spouses receive W-2 wages.
• An employer granted RSUs that vested or settled during 2026.
• An employee purchased and possibly sold shares through an ESPP.
• The household received one or more Forms 1099-B from personal, joint, or employer stock-plan accounts.
• A spouse received Schedule K-1 from an operating partnership with activity in multiple states.
• A beneficiary received an inherited pension or annuity reported on Form 1099-R.
• The couple owns a primary residence and a second home used personally rather than rented.
• The taxpayers received a prior Colorado income-matching or adjustment notice and want to avoid repeat reporting errors.

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Core Tax Rule in One Paragraph

A return involving employer stock and partnership income must reconcile the same economic transaction across several forms. RSU compensation may first appear on Form W-2 and later reappear as stock-sale proceeds on Form 1099-B. ESPP shares can produce compensation income and capital gain or loss in the year of sale. Partnership income passes through to the partner whether or not cash was distributed, while partnership losses may be suspended under several partner-level limitations. State K-1 schedules may create nonresident filing obligations. The return is accurate only when wage reporting, adjusted stock basis, K-1 tax attributes, retirement distributions, itemized deductions, and state-source income are analyzed together.

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Frequently Asked Questions

1. Is this still a “simple” individual tax return?

Not usually. The taxpayers may be employees rather than business owners, but RSUs, ESPP shares, multiple brokerage statements, an operating-partnership K-1, multistate allocations, and an inherited retirement distribution each require separate analysis.

The main risk is not the number of forms. It is overlap: one item can appear on a W-2, stock-plan statement, Form 1099-B, K-1 attachment, and state schedule with different reporting purposes.

2. When are RSUs taxed?

RSUs are generally included in wages when the award settles and the employee receives stock or cash. Many plans settle on the vesting date, but the plan documents and settlement record control.

The value delivered is generally treated as compensation and included in Form W-2. Retain the grant notice, vesting schedule, settlement confirmation, payroll statement, fair market value used by the employer, and records of shares withheld or sold for payroll taxes.

3. How do I avoid paying tax twice when RSU shares are sold?

The amount already included in wages generally becomes part of the stock’s tax basis. A later sale should tax only the change in value after the shares were received.

Broker-reported basis may omit compensation already included in Form W-2. Form 8949 is used to reconcile the sale proceeds and correct an inaccurate basis. A sell-to-cover transaction is still a stock sale and may create a small capital gain or loss; net share withholding may not produce a separate broker sale.

4. How is a qualifying ESPP taxed?

A section 423 ESPP generally does not create income when the option is granted or when the shares are purchased. Tax consequences usually arise when the shares are sold.

The sale may include ordinary compensation attributable to the discount plus a separate capital gain or loss. The ordinary-income computation depends on whether the employee satisfied the later of the one-year-from-transfer and two-year-from-grant holding periods. Form 3922 supplies the dates and values needed for that calculation.

5. What documents are needed for the stock-compensation and brokerage portions?

A year-end composite statement is often not enough. Collect Form W-2, every Form 1099-B or consolidated tax statement, RSU grant and settlement records, sell-to-cover confirmations, supplemental stock-plan basis reports, Form 3922, ESPP purchase records, and a lot-level realized gain-and-loss report.

Separate personal, joint, and employer plan accounts do not require separate tax returns, but each account may issue a separate tax package or a corrected statement.

6. How are stock sales reported when the broker’s basis is wrong or missing?

Sales are generally reconciled on Form 8949 and summarized on Schedule D. The return reports the proceeds shown on Form 1099-B and uses the correct adjusted basis.

When the broker reported an incorrect basis to the IRS, the reported amount is generally entered and corrected through the adjustment columns on Form 8949. When basis was not reported to the IRS, the correct basis is entered directly. Taxpayers should preserve purchase, vesting, and supplemental basis records.

7. How is an inherited pension or annuity reported?

The beneficiary generally starts with Form 1099-R. Box 1 shows the gross distribution, box 2a shows the taxable amount when determined, box 4 shows federal withholding, box 7 identifies the distribution type, and state withholding may appear in the state boxes.

The gross amount is not automatically fully taxable. The plan may contain after-tax contributions or another recoverable basis. The beneficiary designation, distribution code, payment election, and any direct-transfer documents should be reviewed before determining the taxable amount.

8. How does a spouse’s partnership K-1 affect the joint return?

The partnership generally passes income, deductions, credits, and other tax items to its partners. The spouse may owe tax on allocated income even if the partnership made no cash distribution.

Review every K-1 box, code, and attached statement. The package may include guaranteed payments, self-employment information, qualified business income data, liabilities, multiple activities, state allocations, withholding, and pass-through entity tax credits.

9. Are K-1 losses immediately deductible, and can K-1 income be subject to self-employment tax?

Not automatically. Partnership losses are generally tested under the partner’s tax-basis limitation, the at-risk rules, the passive-activity rules, and then any applicable excess-business-loss limitation. Disallowed losses may carry forward.

Self-employment tax depends on the partner’s status, services, guaranteed payments, box 14 information, and the legal and economic facts. Box 1 ordinary income by itself does not resolve the issue.

10. Does a multistate K-1 require a return in every state listed?

No. A state return depends on the amount and character of income allocated to that state, its filing threshold, nonresident withholding, composite-return treatment, and any pass-through entity tax election.

Obtain the complete federal and state K-1 package. A state may appear in the partnership’s operations without creating an individual filing requirement, while a small allocation may still trigger a return in a state with a low threshold.

11. How does Colorado treat a resident’s income from a multistate partnership?

Colorado residents generally report income from all sources. If another state also taxes the same partnership income, Colorado may allow a credit for qualifying tax paid to that state, subject to Colorado’s limitations.

The return must coordinate the source-state filing, Colorado resident return, nonresident withholding, composite payments, and any Colorado or other-state pass-through entity tax credits. A credit is not assumed merely because tax appears somewhere on a K-1.

12. Does a personally used second home go on Schedule E?

No, not when it was neither rented nor held out for rent. A personally used mountain condominium is not a rental activity merely because it is not the principal residence.

Qualified mortgage interest and real property taxes may still be considered on Schedule A. Mortgage interest is subject to the secured-debt, qualified-home, and acquisition-debt limitations that apply across the main and second home.

13. Should the couple itemize or claim the standard deduction?

Use the larger allowable deduction. For 2026, the married-filing-jointly standard deduction is $32,200.

Potential itemized deductions include qualifying mortgage interest, charitable contributions, medical expenses above the statutory floor, and state and local taxes. For 2026, the SALT limit is generally $40,400 for joint filers, with a phase-down when modified adjusted gross income exceeds $500,000; the deduction cannot fall below the statutory floor.

14. Do two dependent children automatically create two Child Tax Credits?

No. For 2025, the maximum Child Tax Credit is $2,200 per qualifying child, but age, relationship, residency, support, dependency, income phaseouts, and taxpayer-identification-number rules still apply.

A child generally must be under age 17 at year-end to qualify for the Child Tax Credit. An older dependent may qualify for the credit for other dependents instead.

15. What should taxpayers do when a K-1 arrives close to the filing deadline?

Do not file an incomplete return merely to meet the deadline. If the federal K-1, state schedules, attached statements, or basis information cannot be reviewed accurately, file an extension and estimate the tax due.

For 2026 calendar-year individual returns, the original filing and payment deadline was April 15, 2027. A timely Form 4868 extended filing to October 15, 2027, but payment remained due April 15.

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Common Mistakes

Assuming RSU income appears only on Form 1099-B

Fix: Reconcile Form W-2, settlement records, sell-to-cover transactions, and broker statements.

Accepting the broker’s equity-compensation basis without review

Fix: Use the stock-plan supplemental report and make any required Form 8949 basis adjustment.

Treating ESPP purchases as permanently tax-free because payroll deductions were after-tax

Fix: Analyze the discount and holding period in the year of sale using Form 3922.

Reviewing only the first pages of Schedule K-1

Fix: Include all statements, state schedules, activity detail, liabilities, and qualified business income information.

Filing in every state named by the partnership—or in none of them

Fix: Apply each state’s source-income, threshold, withholding, composite, and pass-through entity tax rules.

Treating a personally used second home as a rental

Fix: Use Schedule E only when the property was actually rented or held out for rent under the applicable rules.

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Forms and Filing Checklist

The filing package depends on the actual stock transactions, K-1 attachments, partnership loss limitations, and state schedules. The following is the core checklist for this fact pattern.

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Deadlines and Penalty Exposure

Federal individual return

The 2026 Form 1040 filing and payment deadline was April 15, 2027. A timely Form 4868 extended the filing deadline to October 15, 2027. Interest and potential late-payment penalties can accrue on tax not paid by the original deadline.

Late or corrected K-1s and brokerage statements

A late-arriving or corrected K-1 does not automatically extend the individual deadline. Taxpayers should extend when the partnership expects changes or when state schedules and limitation data are incomplete. Corrected brokerage statements must be reconciled against any return already filed; a material change may require an amended return.

Information-matching notices

The IRS and state agencies receive Forms W-2, 1099-B, 1099-R, and K-1 information independently. Omitting a transaction or reporting full proceeds without basis can trigger an automated adjustment. Respond by the notice deadline with the return, source forms, basis support, and a clear reconciliation.

Multistate filing

State deadlines, extension procedures, payment requirements, and penalties vary. A federal extension does not automatically satisfy every state. Potential nonresident filings should be identified before the earliest applicable state deadline.

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Practical Examples

Example 1: RSU settlement and same-day sell-to-cover

Two hundred RSUs settle when the stock is worth $40 per share. The employer includes $8,000 in Form W-2 wages and the broker sells 70 shares at $39.90 to fund withholding.

• Keep the full $8,000 as wage income.
• Report the 70-share sale on Form 8949.
• Use approximately $40 per share as the starting basis, adjusted for plan-specific facts.
• Recognize only the small difference between sale proceeds and adjusted basis as capital gain or loss.
• Carry forward the basis of the remaining shares until they are sold.

Example 2: ESPP shares sold before the holding period

An employee purchases section 423 ESPP shares for $80 when the market value is $100 and sells them six months later for $110. The sale is generally a disqualifying disposition.

• Part of the discount is generally ordinary compensation.
• The compensation component increases the stock basis.
• The remaining difference between adjusted basis and sale price is capital gain or loss.
• Form 3922 and the plan statement support the computation.

Example 3: Colorado resident with a multistate K-1

A Colorado resident receives a K-1 showing income allocated to Colorado, Arkansas, and two other states, plus Arkansas withholding and a Colorado pass-through entity tax credit.

1. Review each state’s source-income amount and filing threshold.
2. Determine whether the partner was included in a composite return.
3. Identify withholding and pass-through entity tax payments.
4. File only the required nonresident returns.
5. Report the full partnership income on the Colorado resident return and claim only allowable credits.

Example 4: Inherited pension and personally used mountain condominium

A married couple receives Form 1099-R for an inherited pension, Forms 1098 for a primary home and a mountain condominium, and property-tax statements for both homes. The condominium was never rented.

• Report the pension’s gross and taxable amounts using Form 1099-R and the plan records.
• Claim withholding shown on the form.
• Do not report the condominium as a rental on Schedule E.
• Analyze qualified mortgage interest and property taxes for Schedule A.
• Compare total itemized deductions with the $32,200 joint standard deduction.

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Closing

A joint return involving RSUs, ESPP shares, partnership income, multiple states, an inherited pension, and two homes cannot be prepared accurately by entering each year-end form in isolation. The W-2 establishes compensation already taxed from employer equity. Form 1099-B and Form 8949 determine the additional capital gain or loss. Form 3922 supports the ESPP calculation. Schedule K-1 carries federal and state partnership items to the individual return. Form 1099-R controls the initial pension reporting, while Schedule A determines whether the two homes and state taxes produce itemized deductions.

Final Takeaway

Reconcile the W-2 to the equity transactions, verify adjusted basis before calculating stock gain or loss, and read every federal and state K-1 statement before deciding what forms and state returns are required.

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IRS-Grounded Source Notes

1. IRS Publication 525 — Taxable and Nontaxable Income (2025) — Covers stock compensation, ESPP holding periods, compensation income, and basis adjustments.

2. IRS Topic No. 427 — Stock Options — Summarizes ESPP sales, ordinary compensation, capital gain or loss, and Form 3922.

3. IRS Form 3922 — Identifies the ESPP dates and values needed to track holding period and basis.

4. Instructions for Form 8949 (2025) — Explains Form 1099-B reconciliation and corrections to broker-reported basis.

5. IRS Publication 575 — Pension and Annuity Income — Explains taxable and nontaxable pension and annuity distributions reported on Form 1099-R.

6. Partner’s Instructions for Schedule K-1 (Form 1065) (2025) — Covers K-1 reporting, outside basis, loss limitations, and self-employment items.

7. IRS Publication 936 — Home Mortgage Interest Deduction (2025) — Covers mortgage interest on a main home and one qualified second home.

8. IRS Publication 501 — Dependents, Standard Deduction, and Filing Information (2025) — Confirms the 2025 standard deduction and dependency rules.

9. Instructions for Schedule A (Form 1040) (2025) — Confirms the 2025 SALT limit, phase-down, and other itemized-deduction rules.

10. Instructions for Schedule 8812 (Form 1040) (2025) — Confirms the 2025 Child Tax Credit amount and qualifying-child rules.

11. IRS — When to File — Confirms the April 15, 2026 deadline and extension framework.

Colorado Source Notes

Colorado Individual Income Tax Guide — Covers Colorado residency and taxation of resident and nonresident income.

Colorado Income Tax Topics: SALT Parity Act — Covers Colorado PTE elections, K-1 reporting, and owner credits.

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Professional-Use Disclaimer

This article is provided for educational purposes and presents a simplified overview of federal and Colorado individual income-tax rules. The correct treatment depends on the taxpayer’s filing status, stock-plan documents, RSU settlement records, ESPP holding periods, brokerage basis information, partnership K-1 and K-3 statements, passive-loss and basis limitations, multistate allocations, inherited pension or annuity records, mortgage and property-tax documentation, dependent eligibility, and the applicable tax year.

Tax laws, deduction limits, credit amounts, filing thresholds, and state procedures may change. Current IRS and Colorado guidance should therefore be reviewed before filing, amending a return, responding to a notice, or relying on any amount or deadline discussed in this article.

For a fact-specific review of your Colorado family tax return—including RSUs, ESPP sales, corrected stock basis, partnership K-1s, multistate income, inherited retirement distributions, and deductions related to a primary or second home — book a paid consultation with our firm